KR101466206B1 - Swivel coupling - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary coupling, and more particularly, to a swivel coupling capable of preventing a high-pressure fluid from leaking through a gap and stably supporting rotation of a water member.
To this end, the present invention is characterized in that an insertion part formed to have a step-like reduced diameter at one end of a rotating male part, a female part connected to be connected to surround the insertion part, a ring groove formed on the outer peripheral surface of the insertion part A bushing inserted into the groove and an engagement protrusion protruding radially outwardly along an outer circumferential surface of the ring groove at an end of the ring groove, and an annular step portion corresponding to the engagement protrusion is formed at one end of the bushing, And is fixed in engagement with the step portion.

Description

{SWIVEL COUPLING}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary coupling, and more particularly, to a rotary coupling in which a pipe fitting does not leak fluid while relatively rotating with respect to each other.

Generally speaking, a rotating coupling refers to a pipe fitting or a pipe fitting to which a fluid flows while relatively rotating while connected to each other.

In particular, a backup ring is used to prevent leakage when high pressure fluid is moved through the rotary coupling. The backup ring is applied to prevent the leakage-preventing O-ring shape from being deformed due to the pressure of the high-pressure fluid.

However, the conventional rotary coupling has a problem that it is not easy to secure the airtightness because it is vulnerable to axial vibration or the like generated during rotation.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a rotary coupling capable of preventing leakage of a high-pressure fluid and capable of stable rotation.

According to an aspect of the present invention, there is provided a rotary coupling comprising: an insertion portion extending from one end of a relatively rotating male member; a female member connected to be wrapped around the insertion portion; The bushing includes a bushing to be inserted into the groove and a stopper protruding radially outward along an outer circumferential surface at the end of the groove. An annular step is formed at one end of the bushing to correspond to the stopper, And the step is fixed by being engaged with the step portion.

Further, a circular sealing member is formed on the outer peripheral surface of the insertion portion so as to be close to the bushing.

And an O-ring-shaped backup ring which closely contacts the sealing member toward the arm member so as to prevent the sealing member from oscillating in the axial direction.

In addition, on the outer circumferential surface of the inserting portion, a hemispherical ball race is formed and a spherical support ball is disposed on the ball race.

As described above, the rotary coupling according to one embodiment of the present invention can improve the durability by reducing the friction and wear of the arm member and the male member by rotation of the male member by the high-pressure fluid.

In addition, a sealing member for supporting the rotation of the water member in the axial direction and preventing the fluid from flowing through the gap between the arm member and the water member by firmly fixing the stop jaws of the step portion and the groove of the bushing, It is effective to prevent and maintain the crevice corrosion by assisting the function.

FIG. 1 (a) is an assembled perspective view of a rotary coupling according to an embodiment of the present invention, and FIG. 1 (b) is a partially exploded perspective view of FIG.
Fig. 2 is a cross-sectional view and a partial enlarged view of Fig. 1 (a). Fig.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view illustrating a rotary coupling according to an embodiment of the present invention. As shown in the figure, the rotating coupling 100 is inserted into the arm member 200, and the threaded portion of the arm member 200 is coupled to an external mechanical device or the like to supply the fluid, And discharges the fluid to the outside through the water member (100).

In order to maintain airtightness while the male member 100 is coupled with the female member 200, the male member 100 has an insertion portion 110 having a stepped reduced diameter at one end.

A circular groove 210 is formed in a circular shape along the outer peripheral surface of the insertion portion 110. Here, the bushing 300 is provided to fit into the groove 210.

The bushing 300 functions to prevent the flow of the high-pressure fluid into the gap between the shaft and the body by filling a gap formed when the male member 100 and the female member 200 are engaged. At this time, the bushing 300 is preferably formed of a Teflon material having excellent heat resistance, non-tackiness, and insulation stability.

The bushing 300 has an inner circumferential surface at one end thereof with a step portion 310 protruding radially inwardly and an outer circumferential surface of the circumferential groove 210 is formed with an engagement protrusion 211 so as to be engaged with the step portion 310, .

In other words, as described above, the stepped portion 310 of the bushing 300 and the engagement protrusion 211 of the ring groove 210 are securely fastened to each other, thereby preventing vibration in the axial direction during the rotation of the male member 100 . Therefore, friction and wear of the arm member 200 and the male member 100 are effectively prevented, thereby allowing the male member 100 to rotate stably.

A circular sealing member 400 may be formed on an outer circumferential surface of the insertion portion 110 to be close to the bushing 300. The sealing member 400 may be formed in an O-ring shape, and the sealing member 400 functions to prevent high-pressure fluid from flowing through the clearance of the male member 100.

In addition, an O-ring-shaped backup ring 600 is provided so that the sealing member 400 can be closely contacted to the arm member 200 with respect to the axial direction. The backup ring 600 functions to prevent the sealing member 400 from being distorted.

A ball race 120 having a hemispherical cross-section is formed along an outer circumferential surface of the insertion portion 110. A spherical support ball 500 having a substantially hemispherical surface contact is disposed on the ball race 120. Here, the support ball 500 may be a ball bearing capable of supporting the rotation of the male member 100 in the radial direction.

As described above, the rotary coupling according to the embodiment of the present invention prevents the high-pressure fluid from flowing into the gap through the gap of the water member 100 by the sealing member 400, The sealing member 400 can be prevented from being deformed .

The bushing 300 prevents friction between the male member 100 and the female member 200 due to the rotation of the male member 100 and wear of the female member 200, The bushing 300 effectively prevents the flow of the fluid through the clearance when the fluid moves due to the high pressure.

Since the stepped portion 310 of the bushing 300 is firmly engaged with the engaging protrusions 211 of the groove 210, the rotation of the male member 100 is stably maintained, The friction and wear of the member 200 and the water member 100 can be minimized.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And all changes to the scope that are deemed to be valid.

100:
110:
120: Ball race
200:
210: Home
211: hanging jaw
300: Bushing
310:
400: sealing member
500: support ball
600: backup ring

Claims (4)

A rotary coupling comprising a female member and a male member and a ball bearing,
An insertion portion 110 extending from one end of the male member 100 to be inserted into the female member 200,
An annular groove 210 in which the outer circumferential surface of the insertion portion 110 is recessed,
An engaging protrusion 211 protruding along the outer circumferential surface of the furthest end of the circular groove 210,
And a bushing 300 having an annular step 310 inserted into the groove 210,
Wherein the engaging protrusion (211) is engaged and fixed to the step portion (310) of the bushing (300).
The method according to claim 1,
Wherein a circular sealing member (400) is formed on an outer circumferential surface of the insertion portion (110) so as to be close to the bushing (300).
3. The method of claim 2,
And an O-ring-shaped backup ring (600) for closely contacting the sealing member (400) to the arm member (100) side.
The method according to claim 1,
Wherein a spherical ball race (120) is formed on an outer circumferential surface of the insertion part (110), and a spherical support ball (500) is disposed on the ball race (120).

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