JPS61223393A - Structure of connecting section of hose and joint fitting - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] ″ The present invention relates to a structure of a connection between a hose and a fitting stem, the inner tube of which is made of a soft material so as to withstand high-temperature fluid. It is something.

[Prior art]

The structure of a conventional connection section will be explained based on the following.

The hose 1 has a reinforcing layer 4 between the outer cover layer 2 and the inner inner tube i.゛Reinforcement layer 4 is -ml
It consists of things that are viral or viral.

Further, the inner tube 3 is made of a soft material. This takes into consideration the problem of rubber curing when used at high temperatures of 90□7 or higher, such as when high-temperature oil is passed through. In order to prevent this rubber hardening hose from deteriorating, soft materials such as nitrile rubber and neoprene rubber with a J'iS hardness of at least FiO are used. The inner cylinder 6 of the fitting 5 is attached to the end of the hose 1 with □.
Being interpolated. The inner surface has a number of locking protrusions 7.
7. A metal outer cylinder '8 having a... is attached to the outer surface of the hose 1 under pressure with a tightening tool (not shown), and the hose is 1 is clamped between the inner cylinder 6 and the inner cylinder 6 so that it cannot be removed.
．． 7. . . . is the reinforcing layer 4 from which the cover layer 2 has been removed.
[Forcibly touching and biting into contact.] This is because the inner tube 3 is made of a soft material, so when there is indirect strong pressure contact through the cover layer 2, the clamping force between the inner tube 6 and the hose 1 is weak and □. This is because there is a risk that 1 will be pulled out in Ho. A threaded connection portion 9 is formed on the opposite side of the inner cylinder 6 of the joint fitting 5, and is connectable to various devices (not shown) using the threaded connection portion 9. There is a hexagonal part (HEX) at the boundary between the inner cylinder 6 and the screw connection part 9
Section) 10 is provided. A groove 11 is provided around the rear of the hexagonal part 10, and one end of the outer cylinder 8 is crimped onto the groove 11, so that the outer cylinder 8 is not accidentally removed from the fitting 5. There is.

[Problem that the invention seeks to solve]

However, since the inner tube 3 of the hose 1 is made of a soft material in consideration of the problem of rubber curing, the outer tube 8 is deformed under pressure and the locking protrusions 7, 7. When the reinforcing layer 4 is brought into strong pressure contact with the reinforcing layer 4, the inner tube 3 is strongly compressed, and pulp 12, which becomes a bulge at the end of the inner tube 6, is formed all around the circumference.

Since this pulp 12 narrows the inner diameter of the hose 1, the flow path resistance increases, and since the pulp 12 has a large amount of deformation, it deteriorates quickly and may cause cracks in the rubber of the original part during short-term use. There was a problem that occurred. Furthermore, the strong tightening force of the outer tube 8 is converted into the generation of pulp 12 in the inner tube, and there is a problem that the sealing performance against fluids is not sufficient.

[Means and effects for solving the problem] The present invention provides a locking protrusion in approximately half of the inner surface of the outer cylinder on the joint fitting side, and forms a shallow groove in the other approximately half, and the locking protrusion portion is By making strong pressure contact with the reinforcing layer from which the cover layer has been removed, and by making weak pressure contact with the shallow groove portion on the outer surface of the cover layer, the hose is strongly clamped and fixed between the inner cylinder by the locking protrusion, and the shallow groove portion The deformation of the inner tube due to the strong clamping force of the locking protrusion is absorbed by the weak pressure contact, and this absorption increases the adhesion force between the inner tube and the inner cylinder to improve fluid sealing performance. At the same time, the generation of pulp was prevented.

[Embodiments of the invention]

Hereinafter, the present invention will be explained in detail based on the implementation shown in FIG. There is no machining on the entire inner surface of the outer cylinder 8, and there are locking protrusions 7, 7°... force on approximately half of the area on the joint 5 side.
, is provided. . In the Lee embodiment, the locking protrusion 7.7.
. . . is two pieces, but it goes without saying that there may be three or more pieces. The locking protrusions 7, 7.・・・・・・
is hose 1. This is similar to the conventional example in that it is directly injected into the reinforcing layer 4 and brought into strong pressure contact. The other half of the inner surface of the outer cylinder 8 has shallow grooves 13, 13. ...A hole is provided around the circumference.
. The shallow grooves 131, 13. . . . are 5° tethers, protrusions 7, 7, . ...
...I made a dream. Range a and shallow groove 13.2.131.・
. . . In this embodiment, the ratio is fixed at 1:IK in a:b, but this ratio can be varied within a large range.

That is, the locking protrusions 7, 7. 4. The hose can be clamped and fixed without being able to come out easily at the part shown in 4. As long as it is a relationship that can prevent
,"・,The object of the present invention can be achieved even with a ratio of 2:14 in b or 1:2 in a:b.The other configurations are the same as the conventional example in 1. The same reference numerals are given to the same reference numerals, and the explanation thereof will be omitted.

Next, the operation of the one-queen embodiment will be explained. Locking projections 7, 7 of outer cylinder 8. By directly making strong pressure contact with the reinforcing layer 4 of the hose 1, the inner tube 3 reliably clamps and fixes the hose 1 made of a soft material between it and the inner tube 6 so that it cannot be pulled out. . This strong clamping force compresses the inner tube 3 and deforms it greatly, but the shallow grooves 13, 13.・・・・・・
The above deformation is caused by the shallow grooves 1B, 11.・・・・・・
* is absorbed by the inner tube 3 located between the inner tube 6 and the inner tube 6. This absorption increases the adhesion force between the inner surface dupe 3 and the inner cylinder 6, thereby improving the fluid sealing property.

Moreover, by absorbing this deformation, the generation of cipulage is prevented. In addition, shallow grooves 13, 13. . . . are rounded holes that bite into the cover layer 2, and the locking protrusions 7, 7. ...... to prevent the hose from being pulled out.

[1 Effect of the invention] - According to the present invention, the locking protrusion of the outer cylinder is brought into direct strong pressure contact with the reinforcing layer of the hose, and the shallow groove part is brought into weak pressure contact with the outer surface of the cover layer. The hose is firmly connected to the fitting ring by the connecting protrusion, and the deformation of the inner tube due to large clamping force is absorbed by the weak pressure contact of the shallow groove, thereby preventing the occurrence of valve formation. Can be defended. Therefore, there is no problem that the inner diameter of the hose gets pinched and the resistance of the flow path increases as in the conventional case. Also, since there is no valve, there is no problem of deterioration. Fourth, absorbing the deformation described above increases the adhesion between the inner tube and the inner cylinder, so that the fluid sealing performance can be improved.

[Brief explanation of the drawing]

FIG. 1 is a half-sectional view showing the structure of the connection part according to the present invention;
FIG. 2 is a half-sectional view showing the structure of a conventional connecting portion. DESCRIPTION OF SYMBOLS 1... Hose, 2... Cover layer, 3... Inner tube, 4... Reinforcement layer, 5... Joint fitting, 6... Inner cylinder, 7... Locking protrusion, 8 ... Outer cylinder, 13... Shallow groove.

Claims (1)

[Claims] The inner tube of the fitting is inserted into the end of the hose, which has a reinforcing layer between the cover layer and the inner tube and the inner tube is made of a soft material, and the outer tube is deformed by pressure from the outer surface of the hose. In the structure of the connection part between the hose and the fitting in which the hose is clamped and fixed between the inner cylinder and the inner cylinder, a locking protrusion is provided on approximately half of the inner surface of the outer cylinder on the side of the fitting, and the other approximately half is provided with a locking protrusion. A connection between a hose and a fitting, characterized in that a shallow groove is formed, the locking protrusion portion is in strong pressure contact with the reinforcing layer from which the cover layer has been removed, and the shallow groove portion is in weak pressure contact with the outer surface of the cover layer. Department structure.