JP4663890B2 - Hose with fluid scattering prevention function - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hose with a fluid scattering prevention function that makes it possible to easily know the damage of the internal core tube from the outside without scattering the internal fluid even if the internal core tube of the hose is damaged. Is.
[0002]
[Prior art]
As shown in FIG. 5, the hose structure conventionally includes an inner core tube 11, a pressure-resistant reinforcing layer 12, and a jacket 13. However, when the inner core tube 11 is broken for some reason as shown in FIG. The fluid 5 destroys the outer cover by the internal pressure, and the internal fluid 5 is ejected to the outside as shown in FIG. That is, when a small hole called a pinhole is opened in the inner core tube 11, a local internal pressure acts on the pressure-resistant reinforcing layer 12, the internal fluid 5 reaches the outer cover 13, and the outer cover 13 is destroyed. Will erupt. Further, when the pressure-resistant reinforcing layer 12 is broken due to deterioration or external damage, the inner core tube 11 and the outer cover 13 cannot withstand the internal pressure and are destroyed at unspecified places, and the internal fluid 5 is ejected to the outside.
[0003]
When such an internal fluid is ejected, the operator of the hose mounting device is injured by the ejected fluid, or the surroundings are damaged by the scattered fluid. In particular, in a high-pressure fluid hose of a device operated by high pressure hydraulic pressure, the oil ejected due to breakage sometimes damages the operator's body and causes an occupational accident. Therefore, in the past, in order to prevent the ejection of fluid, regular replacement was performed regardless of whether the hose was used or not before breakage.
[0004]
[Problems to be solved by the invention]
However, regular replacements inevitably result in the waste of replacing them earlier than necessary in anticipation of safety, or even replacing those that are still usable. Moreover, in order to replace regularly, management of the usage period of the hose is necessary, which causes a problem of complicated management work. Furthermore, there is an unavoidable risk of the hose being damaged for some reason before periodic replacement.
[0005]
Therefore, even if the inner core tube of the hose is damaged, the present invention is intended to ensure the safety of the operators around the hose and prevent the surroundings from fouling, eliminate the need for periodic replacement of the hose, It is an object of the present invention to provide a hose with a fluid scattering prevention function that can eliminate waste such as replacement of a usable hose.
[0006]
[Means for Solving the Problems]
The present invention has been made to solve the above problems, the gist of which is a hose comprising an inner core tube, a pressure-resistant reinforcing layer on the outside thereof, and a jacket, Braided structure, there is a gap between the cords that make up the pressure-resistant reinforcement layer, and when the internal core tube breaks, the internal fluid can pass through the gap in the pressure-resistant reinforcement layer and reach the inner peripheral surface of the jacket And the adhesion between the outer cover and the pressure-resistant reinforcing layer is weak, and the internal fluid can penetrate between the pressure-resistant reinforcing layer and the outer cover while expanding the outer cover according to the tensile breaking elongation of the outer cover. The present invention relates to a hose with a fluid scattering prevention function.
[0007]
And as an example of a specific structure, the envelope of the tensile elongation at break is from 350 to 1200%, in which adhesion between the outer and the breakdown voltage reinforcing layer has a fluid scattering prevention function hose with a 0~400N / m is there.
[0008]
Preferably, the outer cover has a double structure of an inner layer and an outer layer, and the hose with a fluid scattering prevention function is different in the colors of the inner layer and the outer layer. It is 0.3 mm or more, and the entire thickness of the jacket is 2.2 mm or less.
Further, preferably, the pressure-resistant reinforcing layer is knitted so that the knitted structure is formed in a multilayered manner, the density of the first layer on the inner core tube side is high, and the density decreases in order toward the outer jacket side. .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The hose with a fluid scattering prevention function of the present invention is composed of an inner core tube, a pressure-resistant reinforcing layer on the outer side, and a jacket, similarly to a conventional general hose. Here, as long as the inner core tube is in accordance with the type of the internal fluid, there is no limitation on the material, thickness and the like.
[0010]
On the other hand, the pressure-resistant reinforcing layer must be capable of passing the internal fluid when the internal core tube is broken. That is, even if the inner core tube is damaged, the present invention allows the inner fluid to penetrate between the pressure-resistant reinforcing layer and the outer cover while expanding the outer cover, thereby destroying the outer cover. This prevents the internal fluid from scattering to the outside, and allows the damage of the internal core tube to be determined from the appearance by the expansion of the outer cover. Therefore, unless the internal fluid passes through the pressure-resistant reinforcement layer and reaches the inner peripheral surface of the outer jacket, it is impossible to detect the damage of the inner core tube, and the deterioration of the pressure-resistant reinforcement layer due to contact with the internal fluid is not known. It progresses, leading to a sudden breakage of the pressure-resistant reinforcing layer and a jacket breakage accompanying it.
[0011]
Here, in order to allow the internal fluid to reach the inner peripheral surface of the jacket, for example, the pressure-resistant reinforcing layer may be a braided (blade) structure. This is because with the braided structure, there is a gap between the cords constituting the pressure-resistant reinforcing layer, so that the internal fluid can pass therethrough. On the other hand, even in the spiral structure in which the cord is wound spirally, the internal fluid can be passed by adjusting the number of cords to be driven (decreasing the number of cords to provide an interval between the cords). However, since the cord is generally bonded to the spiral structure due to manufacturing problems, the adhesive prevents the internal fluid from passing, which is not a good idea.
[0012]
Moreover, the pressure-resistant reinforcement layer is made into a multilayer structure according to a use pressure. In this case, it is preferable to increase the density of the first layer on the inner core tube side and decrease the density in order toward the outer jacket side. This is because the inner fluid is diffused as it goes toward the outer cover, so that the outer cover expands as a whole without local pressure acting on the outer cover. The cord constituting the pressure-resistant reinforcing layer may be either metal or fiber, and may be twisted or untwisted. However, in the case of fiber yarn, it is preferable to be in the range of 0 to 50 turns / m.
[0013]
Next, it is necessary to weaken the adhesion between the pressure-resistant reinforcing layer and the outer jacket. That is, according to the present invention, when the internal fluid passes through the pressure-resistant reinforcing layer and reaches the inner peripheral surface of the outer cover, the internal fluid penetrates between the pressure-resistant reinforcing layer and the outer cover without destroying the outer cover. Thus, the jacket is expanded. Therefore, when the internal pressure acts on the outer cover, the outer cover breaks if the pressure-resistant reinforcing layer and the outer cover have a strong adhesive force, so that the leaked internal fluid cannot be stored.
[0014]
Here, in order to weaken the adhesive force between the pressure-proof reinforcing layer and the jacket, for example, the pressure-proof reinforcing layer and the jacket may not be bonded at all. Moreover, when it makes it adhere | attach, it is preferable that the adhesive force with a pressure | voltage resistant reinforcement layer shall be 400 N / m or less. Furthermore, in order for the internal fluid that has reached the outer casing to expand without breaking the outer casing, the tensile breaking elongation of the outer casing is preferably set to 350 to 1200%.
[0015]
As described above, in the hose of the present invention, when the inner core tube is broken, the jacket expands without breaking. Therefore, the internal fluid does not scatter to the outside, and it is possible to visually determine whether the internal core tube is broken while ensuring safety. However, it is also conceivable that the internal core tube is not damaged first, but the internal core tube and the outer cover are destroyed at unspecified places due to the damage of the pressure-resistant reinforcing layer. For example, this is a case where the outer casing is damaged due to wear or the like, and the pressure-proof reinforcing layer is exposed. In this case, if the pressure-resistant reinforcing layer is damaged, the inner core tube and the outer cover are also destroyed, so that the internal fluid is scattered outside.
[0016]
Therefore, in order to cope with such a case, it is preferable that the outer cover has a double structure of the inner layer and the outer layer, and the colors of the inner layer and the outer layer are changed. If the colors are different, the exposure of the inner layer can be visually recognized when the outer layer is worn, and a danger signal can be issued before the outer wear reaches the pressure-resistant reinforcing layer. In other words, the criteria for determining the hose replacement time, which has been unclear in the past, such as the magnitude and depth of trauma, are easily clarified by replacing the hose when the inner layer can be visually confirmed. It can prevent eruption disasters and pollution.
[0017]
Here, the thickness of the inner layer of the jacket is preferably set to 0.3 mm or more. When the outer layer is worn and the inner layer is exposed, the outer cover on the pressure-resistant reinforcing layer in that portion becomes only the inner layer. This is because a local bulge is generated when the pressure reaches the point, and the inner fluid breaks the outer cover before it penetrates between the pressure-resistant reinforcing layer and the outer cover. For the same reason, the outer cover thickness is preferably 0.3 mm or more when the outer cover is a single layer.
[0018]
Moreover, it is preferable that the overall thickness of the outer jacket be 2.2 mm or less. As the thickness increases, the jacket becomes difficult to expand, so the internal fluid will permeate between the pressure-resistant reinforcement layer and the jacket without expanding the jacket so much. It is because it becomes difficult to judge from. That is, the overall thickness of the outer cover may be set to such an extent that expansion can be accurately determined from the appearance in consideration of the tensile breaking elongation and hardness of the outer cover.
[0019]
Furthermore, the thickness of the outer layer of the jacket is preferably 0.2 mm or more. This is because if the thickness is less than 0.2 mm, the inner layer is exposed immediately. In addition, the upper limit of the preferable range of the thickness of the outer layer is 1.9 mm or less because the thickness of the inner layer is 0.3 mm or more and the total thickness of the jacket is 2.2 mm or less. The upper limit of the thickness of the inner layer is 2.0 mm or less because the thickness of the outer layer is 0.2 mm or more and the entire thickness of the jacket is 2.2 mm or less. It is preferable that
[0020]
In addition, the hose does not function because it cannot be attached to the equipment unless the metal fittings are fixed to both ends. The hose with a fluid scattering prevention function of the present invention is naturally provided with a fitting, but at this time, the internal fluid that has permeated between the pressure-resistant reinforcing layer and the outer jacket does not leak from the connection portion between the hose and the fitting. In addition, it is necessary to crimp the fitting from above both ends of the jacket (from the top of the outer layer when the jacket has a double structure).
[0021]
【Example】
Hereinafter, preferred embodiments of the present invention will be described in more detail. FIG. 1 is a half sectional view showing a first embodiment of a hose with a fluid scattering prevention function according to the present invention, and shows a state in which an inner core tube, a pressure-resistant reinforcing layer, and an outer jacket are exposed. That is, the hose of the first embodiment is made of an inner core tube 1 made of nylon, a pressure-resistant reinforcing layer 2 (first layer 2A, second layer 2B, third layer 2C) composed of three layers of polyester fiber knitting structure, and made of polyurethane. This is an insulated hydraulic hose having a double-layered outer casing 3 (the inner layer 3A is orange and the outer layer 3B is green), and is used in power distribution work.
[0022]
Each of the layers 2A to 2C of the pressure-proof reinforcing layer 2 has a knitted structure in which the number of drivings is 1500 denier × 3 × 24, and the density increases as the winding diameter increases. First layer 2A> second layer 2B> It becomes smaller in order of the third layer 2C. Further, the tensile elongation at break of the jacket under an environment of 20 ° C. is 1053%, the breaking strength is 249 N (JIS K 6251 No. 3 test piece shape 0.92 mm thickness, tensile speed 200 mm / min), and the hardness is 90 ° (JIS K). 7215 type A durometer), the thickness of the inner layer 3A of the jacket is 0.9 mm, and the thickness of the outer layer 3B is 0.5 mm. Further, the third layer 2C of the pressure-resistant reinforcing layer and the inner layer 3A of the outer cover are not bonded, and the outer layer 3B of the outer cover 3B is also integrated with the fitting 4 in order to increase the safety and reliability of the crimped portion. It is crimped.
[0023]
Next, the inner core tube 1 in the central portion of the hose of the first embodiment was damaged, a pinhole was generated and attached to a hydraulic device, and hydraulic oil was flowed as an internal fluid 5 at a pressure of 700 kgf / cm ² . Then, as shown in FIG. 2 (A), the hydraulic oil 5 passes through the gaps between the pressure-resistant reinforcing layers 2A to 2C and reaches the inner peripheral surface of the inner layer 3A of the outer cover, and the outer oil 5 The hydraulic oil 5 penetrated between the third layer 2C of the pressure-proof reinforcing layer and the inner layer 3A of the outer cover while expanding the covers 3A and 3B to store the hydraulic oil 5.
[0024]
Therefore, it could be visually recognized that the inner core tube 1 was damaged by expanding and thickening the jackets 3A and 3B as shown in FIG. Further, in this state, the operation time of the hydraulic equipment was abnormally longer than the normal operation time, so that the damage to the inner core tube could be confirmed.
[0025]
FIG. 3 is a half sectional view showing a second embodiment of the hose with a fluid scattering preventing function according to the present invention. In the caulking portion of the fitting 4 in the first embodiment, the end portion of the outer layer 3B of the jacket And the reliability of tightening with respect to the pressure-resistant reinforcing layer 2 is improved. Even in the case of the second embodiment, the internal fluid permeates between the third layer 2C of the pressure-resistant reinforcing layer and the inner layer 3A of the outer cover, so that the internal fluid leaks from the crimped portion of the fitting 4. I will not put it out.
[0026]
FIG. 4 is a half sectional view showing a third embodiment of the hose with a fluid scattering prevention function according to the present invention. The pressure-proof reinforcing layer 2 in the first embodiment has four layers (first layer 2A, second layer 2B). 3rd layer 2C and 4th layer 2D). As the number of pressure-resistant reinforcing layers increases, the pressure-resistant performance improves. However, as the number of layers increases, the internal fluid becomes difficult to reach the inner peripheral surface of the outer jacket inner layer 3A, so that four layers are provided as in the third embodiment. The degree is appropriate.
[0027]
【The invention's effect】
As described above, the hose with a fluid scattering prevention function of the present invention allows the internal fluid to reach the inner peripheral surface of the outer jacket through the pressure-resistant reinforcing layer when the inner core tube is damaged. In addition, the adhesion between the outer cover and the pressure-resistant reinforcing layer is weak, and the internal fluid can penetrate between the pressure-resistant reinforcing layer and the outer cover while expanding the outer cover according to the tensile breaking elongation of the outer cover. Therefore, even if the internal core tube is broken, the internal fluid is not scattered outside, and it is possible to ensure the safety of the operator around the hose and to prevent the surrounding contamination. Moreover, since it is possible to judge the damage of the inner core tube from the appearance, it is not necessary to periodically replace the hose, and it is possible to eliminate waste such as management of the use period and replacement of the usable hose.
[0028]
In addition, if the outer cover has a double structure of the inner layer and the outer layer, and the colors of the inner layer and the outer layer are changed, the exposure of the inner layer can be visually recognized when the outer layer is worn, thereby making it easy to determine the criteria for when to replace the hose. Therefore, it is possible to prevent the occurrence of internal fluid ejection accidents and contamination due to an error in the replacement time.
[Brief description of the drawings]
FIG. 1 is a half sectional view showing a first embodiment of a hose with a fluid scattering prevention function according to the present invention.
FIG. 2 is a conceptual diagram showing a process in the case where there is a pinhole in the inner core tube of the hose of the first embodiment.
FIG. 3 is a half sectional view showing a second embodiment of the hose with a fluid scattering preventing function according to the present invention.
FIG. 4 is a half sectional view showing a third embodiment of the hose with a fluid scattering preventing function according to the present invention.
FIG. 5 is a conceptual diagram showing a process when a pinhole is present in an inner core tube of a conventional hose.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Internal core tube 2 ... Pressure-resistant reinforcement layer 2A ... 1st layer 2B of pressure-resistant reinforcement layer 2nd layer 2C of pressure-resistant reinforcement layer 3rd layer 2D of pressure-resistant reinforcement layer 4th layer 3 of pressure-resistant reinforcement layer 3 3A ··· Inner layer 3B ··· Outer layer 4 · · Fitting 5 · Internal fluid (hydraulic oil)
11. Internal core tube 12 Pressure-resistant reinforcing layer 13 Outer sheath

Claims (5)

A hose comprising an inner core tube (1), a pressure-proof reinforcing layer (2) on the outside thereof, and a jacket (3),
The pressure-resistant reinforcing layer (2) has a knitted structure, and there is a gap between the cords constituting the pressure-resistant reinforcing layer (2),
When the internal core tube (1) is damaged, the internal fluid can reach the inner peripheral surface of the outer cover (3) through the gap of the pressure-resistant reinforcing layer (2), and the outer cover (3 ) And the pressure-resistant reinforcing layer (2) are weak, and the internal fluid expands the outer cover (3) according to the tensile elongation at break of the outer cover (3), and the pressure-resistant reinforcing layer (2) and the outer cover ( 3) A hose with a fluid scattering prevention function, characterized in that it can permeate between.   The tensile breaking elongation of the outer cover (3) is 350 to 1200%, and the adhesive force between the pressure-resistant reinforcing layer (2) and the outer cover (3) is 0 to 400 N / m. Hose with fluid scattering prevention function.   The outer cover (3) has a double structure of an inner layer (3A) and an outer layer (3B), and the inner layer (3A) and the outer layer (3B) have different colors. Hose with fluid scattering prevention function.   The fluid scattering according to claim 3, wherein the thickness of the inner layer (3A) of the jacket (3) is 0.3 mm or more and the total thickness of the jacket (3) is 2.2 mm or less. Hose with prevention function.   The pressure-resistant reinforcing layer (2) is knitted so that the knitted structure is formed in multiple layers, the density of the first layer on the inner core tube (1) side is high, and the density decreases in order toward the outer cover (3) side. The hose with a fluid scattering prevention function according to any one of claims 1 to 4, wherein the hose has a fluid scattering prevention function.

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