JPH0518080Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is an ultra-high-pressure water injection nozzle used when cutting plastic or other materials using a water jet, in particular an improvement in its seal structure. It is related to.

[Prior art] Conventionally, ultra-high pressure water injection nozzles, for example,
For ultra-high pressure water of 1000Kg/cm2 or ^more ,
The nozzle tip used is often made of a hard material such as diamond to improve wear resistance since the water ejecting part is subject to severe wear.

However, high hardness materials such as diamond,
It has the disadvantage that it is strong against compressive force but extremely weak against tensile force, and sometimes breaks because it cannot withstand the tensile stress in the circumferential direction that occurs when ultra-high pressure is applied inside the nozzle tip.

In order to prevent such destruction, nozzle members in which a diamond nozzle tip is wrapped in a metal material have recently come into use. An example of a conventional ultra-high pressure water injection nozzle using such a nozzle member will be briefly described below with reference to FIGS. 3 and 4.

FIG. 3 is a longitudinal sectional view of the tip of a conventional ultra-high pressure water injection nozzle, and FIG. 4 is a longitudinal sectional view of the nozzle member.

In the figure, a nozzle holder 31 is attached to the tip of an ultra-high pressure water conduit (not shown), and ultra-high pressure water passes through a guide hole 32 that is penetrated along the internal axis. . Inside the tip of the nozzle holder 31, a nozzle member 33 is disposed facing the opening end of the guide hole 32, and an O-ring 34 made of an elastic material is interposed between the periphery of the opening end and the end surface of the nozzle member. . This nozzle member 33 is attached to the nozzle holder 3.
A nozzle cap 35 having a through hole 36 in the center is screwed onto the tip of the nozzle holder 31 in order to hold the nozzle holder 31 in place and compress the O-ring 34 to function as an all-around seal. As shown in FIG. 4, the nozzle member 33 has a diamond nozzle chip 37 wrapped and integrated in a metal mold 38, and has sufficient strength against tensile stress in the chip circumferential direction due to internal pressure. It's starting to hold up.

With the nozzle configured as described above, when ultra-high pressure water is supplied from the ultra-high pressure water conduit to the nozzle holder 31 attached to the tip thereof, it passes from the guide hole 32 to the nozzle hole of the nozzle tip 37 of the nozzle member 33 to the outside. sprayed, thereby causing e.g. cutting, etc.
Predetermined processing is performed on a workpiece (not shown).

[Problem to be solved by the invention] In the conventional ultra-high pressure water injection nozzle, the seal of the fitting gap of the nozzle member 33 in the nozzle holder 31 compresses the O-ring 34 made of an elastic material. The sealing life of the O-ring 34 is extremely short due to fatigue due to repeated on-off turning on and off of water jets, and the O-ring 34 must be replaced frequently to prevent early damage to the nozzle due to water leakage and to maintain the cutting performance of the water jet. must be replaced,
There was a problem that the running cost of the nozzle was high.

The present invention has been developed in view of these points, and aims to reduce the running cost of the ultra-high pressure water injection nozzle by improving the durability and reliability of the seal structure.

[Means for Solving the Problems] In the ultra-high pressure water injection nozzle according to this invention, the seal of the nozzle member in the nozzle holder is sealed on the outer peripheral surface of the nozzle member by a metal seal ring having a wedge-shaped cross section. The above-mentioned problem has been achieved by configuring the system to perform the following steps.

In other words, the ultra-high pressure water injection nozzle of this invention is
a nozzle holder passing through an ultra-high pressure water guide hole; a nozzle member disposed inside the tip of the nozzle holder so as to face the opening end surface of the guide hole; and a nozzle member fitted around the outer periphery of the nozzle member and the nozzle holder. a metal seal ring with a wedge-shaped cross section for sealing a gap with the inner wall; and a tip of the nozzle holder for holding the nozzle member inside the tip of the nozzle holder and press-fitting the metal seal ring into the gap. and a nozzle cap that is tightenably attached to the nozzle cap.

[Function] In this invention, the seal structure for maintaining the watertightness of the high-pressure jet fluid within the nozzle holder is
A metal seal with a wedge-shaped cross section forms a metal seal around the entire outer circumference of the nozzle member without compressing the elastic seal ring, and this seal ring can be tightened with the nozzle cap. It is designed to be press-fitted. For this reason, by using a highly durable metal seal ring and tightening it from time to time, it can withstand the repeated on-off of ultra-high pressure water jets for a long period of time without having to disassemble it. be.

Therefore, the number of seal ring replacements is significantly reduced, and the time required for seal replacement can be saved, thereby improving the productivity of cutting and other processing equipment using the nozzle of this invention. .

[Example] An example of the invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows the structure of an ultra-high pressure water injection nozzle according to an embodiment of this invention in longitudinal section, and FIG. 2 shows the internal structure of the nozzle member.

In the figure, a nozzle holder 11 is attached to the tip of an ultra-high pressure water conduit (not shown), and ultra-high pressure water passes through a guide hole 12 that is penetrated along the internal axis. . The tip of the nozzle holder 11 is a concave part, and a nozzle member 13 is disposed inside the concave part facing the open end of the guide hole 12. A wedge-shaped part is formed between the inner wall of the holder 11 and the outer peripheral surface of the nozzle member. Cross-sectional metal seal ring 14
is fitted. In order to hold this nozzle member 13 in the nozzle holder 11 and push the seal ring 14 toward the wedge tip, to maintain a seal all around the outer peripheral surface of the nozzle member 13,
A through hole 1 is provided in the center of the concave portion at the tip of the nozzle holder 11.
A nozzle cap 15 with 6 is screwed on. In order to fit this nozzle cap 15, grooves 15a and 11a are formed in the outer peripheral surface of the nozzle holder 11 and the outer peripheral surface of the nozzle cap 15, respectively, for applying a tool such as a wrench.

The nozzle member 13, as shown in FIG.
A nozzle tip 17 made of diamond is enclosed and integrated within a metal mold 18, and is designed to have sufficient strength against tensile stress in the circumferential direction of the tip due to the action of internal pressure.

With the nozzle configured as described above, when ultra-high pressure water is supplied from the ultra-high pressure water conduit to the nozzle holder 11 attached to the tip thereof, it passes from the guide hole 12 to the nozzle hole of the nozzle tip 17 of the nozzle member 13 to the outside. sprayed, thereby causing e.g. cutting, etc.
Predetermined processing is performed on a workpiece (not shown).

Since the metal seal ring 14 has a wedge-shaped cross-section, by retightening the nozzle cap 15 during use, sealing performance can be maintained for a long period of time that exceeds the life of the nozzle.
During this time, there is no need to disassemble the nozzle.

It goes without saying that the present invention is not limited to the one embodiment described above, and that various design changes can be made to achieve the same effect.

[Effects of the invention] As explained above, according to the invention, the seal structure that maintains the watertightness of the injected fluid is constituted by a metal seal made of a metal seal ring with a wedge-shaped cross section, and the tightening This makes it possible to easily do this from the outside, making it possible to maintain sealing performance for a long period of time beyond the life of the nozzle thanks to the highly durable metal seal ring.
Therefore, it is possible not only to reduce the running costs of cutting equipment, etc. using the nozzle of this invention, but also to improve product quality due to improved productivity and reduced processing defect rate. .

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of essential parts showing the configuration of an ultra-high pressure water injection nozzle according to an embodiment of the present invention, Fig. 2 is a longitudinal cross-sectional view of the nozzle member, and Fig. 3 is a conventional ultra-high pressure water injection nozzle. FIG. 4 is a vertical sectional view of the nozzle member. Explanation of symbols of main parts, 11... Nozzle holder,
12...Ultra high pressure water guide hole, 13...Nozzle member, 1
4... Metal seal ring, 15... Nozzle cap, 16... Through hole, 17... Diamond nozzle tip, 18... Metal mold.

Claims (1)

[Scope of utility model registration request] a nozzle holder having an ultra-high-pressure water guide hole extending therethrough; a nozzle member disposed inside the tip of the nozzle holder so as to face the opening end surface of the guide hole; a metal seal ring with a wedge-shaped cross section for sealing a gap with the inner wall of the holder; and a nozzle holder for holding the nozzle member inside the tip of the nozzle holder and press-fitting the metal seal ring into the gap. An ultra-high pressure water injection nozzle characterized by comprising a nozzle cap that can be fitted into the tip.