JPS598065Y2 - Ultra high pressure fluid fitting - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a fluid passage joint for ultra-high pressure fluid of several thousand atmospheres.

Couplings for equipment that handle ultra-high pressure fluids of several thousand atmospheres are extremely difficult due to their nature, and it is extremely difficult to prevent fluid pressure from leaking to the outside from the coupling portion.

Conventionally, as shown in Fig. 1, a sealing cone 3 having conical shapes on both sides is installed between a female joint 1 and a male joint 2, and the two joints are screwed together and tightly tightened. What is used is one that generates surface pressure between the cone 3 and the receiving surfaces 4 of both joints, thereby creating a fluid pressure seal there.

However, with this method, as the fluid pressure fluctuates and increases, the tightening force on the threaded portion must be increased accordingly to increase the surface pressure between the sealing cone 3 and its receiving surface 4. In addition, if the sealing cone is frequently attached and detached, or if the pressure is particularly high, the sealing cone itself may become deformed, making it impossible to achieve the intended purpose.
Furthermore, there are many inadequacies, such as damage to the sealing surface of the sealing cone or the receiving surface 4 of the joint, making it impossible to expect a perfect seal.

The present invention is capable of resolving these deficiencies of the conventional method, and includes drilling a sealing insertion hole with a larger diameter than the fluid passageway across the contact surfaces of the female and male joints that are perpendicular to the fluid passageway. Then, a hollow cylindrical sealing element made of an elastic body is press-fitted into the sealing element, and the abutting surface with an extremely small gap is sealed with the peripheral wall of the sealing element, and ultra-high pressure fluid of several thousand atmospheres is applied. Even when the seal element is used, the seal element does not protrude outward from the abutment surface, and the seal element is self-sealed by fluid pressure to completely prevent fluid leakage.

This will be explained with reference to the drawings.

The female joint 1 and the male joint 2 are screwed together at the threaded portion 6 until their contact surfaces 10, which are perpendicular to the fluid passage 5, abut against each other.

5 is a fluid passage. Reference numeral 7 denotes a sealing insertion hole having a diameter larger than that of the fluid passage 5, which is bored across the contact surfaces 10 of both the joints 1 and 2.

A sealing element 8 is press-fitted into the sealing insertion hole, and is made of an elastic material such as rubber or plastic and has a hollow cylindrical shape.

This elastic, hollow cylindrical sealing element 8 is press-fitted into the sealing insertion hole 7 formed across the abutting surfaces 10 of both joints 1 and 2, and the peripheral wall of the sealing element 8 is pressed against the abutting surface. 10 is sealed.

Then, the initial seal is achieved by the expansion force due to its elasticity.

When ultra-high pressure is applied to the fluid passage, the seal element 8 is pressed against the low pressure side, that is, the gap between the contact surfaces 10 between the joints 1 and 2, but this gap between the joints is extremely small. Therefore, the sealing element 8 is pressed without protruding from the abutment surface 10, and fluid leakage is completely prevented and a seal is achieved.

That is, the higher the fluid pressure, the more the seal becomes
The self-sealing is complete and the purpose can be achieved.

Since the structure of the present invention is extremely simple, the joint part is not complicated and can have an extremely small diameter, and the seal part requires less processing than conventional sealing cones. It is easy to manufacture and can be manufactured at low cost.

In addition, the seal part does not deform or get damaged during use, and can withstand frequent attachment and detachment, and the joints are extremely easy to join, and there is no need to worry about excessive damage. Doesn't require much force.

[Brief explanation of drawings]

FIG. 1 is a vertical joint side view of a conventional joint, FIG. 2 is a vertical cross-sectional side view of the joint of the present invention, and FIG. 3 is a vertical cross-sectional side view of another embodiment. 1...Female joint, 2...Male joint, 5...
...Fluid passage, 7...Sealing insertion hole,
8... Seal element, 10... Contact surface.

Claims (1)

[Scope of utility model registration request] The female joint 1 and the male joint 2 are screwed together until the abutting surfaces 10 that are perpendicular to the fluid passages 5 abut against each other, and the diameter is larger than that of the fluid passages 5 of both the joints 1 and 2 across the abutting surfaces 10. An ultra-high pressure fluid coupling in which a sealing insertion hole 7 is bored, and a sealing element 8 made of an elastic material and having a hollow cylindrical shape is compressed in the insertion hole 7.