US-12624761-B2 - Seal for high pressure water jets

US12624761B2US 12624761 B2US12624761 B2US 12624761B2US-12624761-B2

Abstract

Proposed is a seal for a pressurized water jet apparatus which includes a housing, a connector through which pressurized water is introduced, a rotary body exposed in a direction in which the pressurized water inside the housing is discharged, a rotary support for supporting the rotary body, a nozzle connected to an end of the rotary body, a shaft, a bushing, and a seal coupled to the outer circumferential surface of the shaft and having a surface in contact with the bushing, wherein the seal includes an outer seal provided with a through hole having a tapered portion inclined so that the inner diameter thereof is expanded in the direction in which the pressurized water is discharged, and an inner seal inserted in the tapered portion of the outer seal and having the same inner diameter as that of the through hole of the outer seal.

Inventors

Do Hyoung KIM

Assignees

BC TAECHANG INDUSTRIAL CORP.

Dates

Publication Date: 20260512
Application Date: 20220705
Priority Date: 20220218

Claims (7)

1 . A seal for a pressurized water jet apparatus utilizing a pressurized water stream provided therein, wherein the pressurized water jet apparatus includes an inner shaft, and a rotary body rotatably coupled to the inner shaft, wherein the seal comprises: an outer seal of generally tubular shape, the outer seal including an axially-extending through hole containing a tapered hole portion therein such that an inner diameter of the tapered hole portion is expanded in a direction in which the pressurized water stream inside the pressurized water jet apparatus is to be discharged; and an inner seal inserted in the tapered hole portion of the outer seal and having an inner diameter allowing the inner shaft of the pressurized water jet apparatus to be snugly inserted thereto, wherein an outer surface of the inner seal is tapered to correspond to a shape of the tapered hole portion of the outer seal, so that the inner seal is pressed along a tapered surface of the outer seal to limit a compression deformation of the outer seal as a hydraulic pressure of the pressurized water acts on distal end surfaces, located farther from an operator of the pressurized water jet apparatus, of the outer seal and the inner seal.
2 . The seal for a pressurized water jet apparatus of claim 1 , wherein the inner seal is made of a harder material than that of the outer seal.
3 . The seal for a pressurized water jet apparatus of claim 1 , wherein a protrusion is formed on a distal side, located farther from the operator of the pressurized water jet apparatus, of the tapered hole portion of the outer seal to prevent the inserted inner seal from escaping to an outside.
4 . The seal for a pressurized water jet apparatus of claim 3 , wherein the inner seal is placed at a proximal side, located nearer to the operator of the pressurized water jet apparatus of the tapered hole portion and a distal end, located farther from the operator of the pressurized water jet apparatus, of the inner seal is displaced from the protrusion of the outer seal.
5 . The seal for a pressurized water jet apparatus of claim 1 , wherein an O-ring is provided on an outer peripheral surface of the outer seal.
6 . The seal for a pressurized water jet apparatus of claim 1 , wherein the tapered hole portion is provided throughout an entire length of the through hole of the outer seal, and the inner seal is placed at a proximal side, located nearer to the operator of the pressurized water jet apparatus, of the tapered hole portion.
7 . The seal for a pressurized water jet apparatus of claim 1 , wherein a protrusion is formed on a distal end, located farther from the operator of the pressurized water jet apparatus, of the tapered hole portion of the outer seal to prevent the inserted inner seal from escaping to an outside, wherein the through hole of the outer seal further includes a non-tapered cylindrical hole portion coaxially extending from a proximal end, located nearer to the operator of the pressurized water jet apparatus, of the tapered hole portion of the outer seal, wherein the inner seal has the outer surface exactly matching to the tapered hole portion and the non-tapered cylindrical hole portion of the outer seal while the inner seal being abutted against the protrusion of the outer seal.

Description

REFERENCE TO RELATED APPLICATIONS This application claims the priority benefit of Korean Patent Application No. 10-2022-0021422 filed on Feb. 18, 2022, the entire contents of which are incorporated herein by reference. FIELD OF THE INVENTION The present disclosure relates to a seal for high pressure water jets and, more particularly, to a technology that can improve durability of a seal for high pressure water jets by preventing deformation caused by high pressure water by constructing a double seal. BACKGROUND OF THE INVENTION A high pressure water jet is a device that can remove aged paint or corrosives from metal surfaces by spraying water with high pressure. As a related art, Korean Utility Model Registration No. 20-0290119 “HIGH PRESSURE WATER INJECTION DEVICE FOR PUMP” is disclosed. FIG. 1 is a view showing a conventional high pressure water injection device for a pump. Referring to the drawing, provided is a high pressure water injection device for a pump in which a hose connector 2 is screwed into a housing 1 to which a metal ring 15 is fixed with a cap nut 3, and inside the housing 1, a hole shaft 4 is affixed by bearings 6 and 6′, but between the bearings 6 and 6′, a permanent magnet 7 is fixed in close contact with the inner surface of the housing 1 by a bushing 8 while maintaining the gap with a jaw 401 of the hole shaft 4 by a spacing ring 9, and at the inlet of the hole shaft 4, a seal 11 and a bushing 12 are fixed with a screw 13 to prevent the hole shaft 4 from falling out and adhere to a guide pipe 10 fixed to the hose connector 2, and in a nozzle head 5 fixed to the end of the hole shaft 4, several injection holes 5A are formed in a circular shape, and a nozzle 14 is fixed so that the nozzle head 5 may be rotated by the injection pressure. At this time, the high pressure water is injected through the hole shaft 4 rotating along the guide pipe 10, and since the high pressure water flows inside the hole shaft 4, the seal 11 is compressed to the opposite side under strong pressure. There is a problem that the continuously compressed seal 11 is pushed into the inside of the bushing 12 at a portion in contact with the bushing 12 and is damaged. DOCUMENTS OF RELATED ART Patent Documents (Patent Document 0001) KR 20-0290119 Y1. SUMMARY OF THE INVENTION Accordingly, the present disclosure has been made keeping in mind the above problems occurring in the related art, and the present disclosure is intended to provide a seal for high pressure water jets, which can avoid deformation as much as possible to be protected even when the seal is pressured by high pressure water. In order to achieve the above objective, according to an embodiment of the present disclosure, there is provided a seal for high pressure water jets, the high pressure water jets each including: a housing; an inlet unit coupled to an inside of the housing on a first side thereof, and into which high pressure water is introduced; a rotary unit mounted inside the housing and exposed in a direction in which the high pressure water inside the housing is discharged; a discharge unit connected to an end of a rotary body of the rotary unit; and a seal provided between the inlet unit and the rotary body inside the rotary unit, wherein the seal includes: an outer seal in which a through hole having a tapered portion inclined so that an inner diameter is expanded in the direction in which the high pressure water is discharged is formed; and an inner seal inserted in the tapered portion of the outer seal and having a same inner diameter as that of the through hole. An outer side of the inner seal may be formed to be tapered to correspond to a shape of the tapered portion, so that the inner seal is pressed along an inclined surface of the outer seal to prevent compression deformation of the outer seal as pressure of the discharged high pressure water acts on first ends of the outer seal and the inner seal. The inner seal may be made of a harder material than that of the outer seal. A protrusion may be formed on the tapered portion of the outer seal to prevent the pressurized and inserted inner seal from escaping to the outside. An O-ring may be formed on an outer peripheral surface of the outer seal. As described above, the seal for high pressure water jets of the present disclosure has a following effect. Since the seal is constructed as a double seal, when the pressure of high pressure water is applied, an inner seal located inside an outer seal is pressed along a tapered portion, so that compression deformation of the outer seal can be prevented as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS The above and other objectives, features, and other advantages of the present disclosure will be more clearly understood from the following detailed description when taken in conjunction with the accompanying drawings, in which: FIG. 1 is a cross-sectional view of a conventional high pressure water jet; FIG. 2 is a cross-sectional view of a high