KR20190114387A - swivel joint - Google Patents

Abstract

The present invention relates to a swivel joint. The swivel joint is to improve sealing performance and durability. According to the present invention, the swivel joint includes: a housing unit having a through space inside and having a sealing groove unit formed to be dented and including a sealing unit on the inner circumference on one side of the through space, wherein the housing unit has a first short protrusion unit and a second short protrusion unit formed in order on the inner circumference of the other side of the through space; a ball support unit formed in a cylindrical shape having the thickness corresponding to the width of a short protrusion of the first short protrusion unit and having a second ball groove at an end, wherein the outer circumference is connected by being screwed to the inner circumference of an extension coupling unit; a stem unit having a third ball groove on the outer surface facing the second ball groove and having a sealing end unit at a frame of the outer circumference of an end exposed to the outside of the ball support unit, wherein the radius of the sealing end unit becomes reduced toward an end; a ball unit having multiple balls inserted in the circumferential direction between a first ball groove, the second ball groove, and the third ball groove and rotating and supporting the stem unit; and a needle bearing unit installed between the second short protrusion unit and a third short protrusion unit and rotating and supporting the stem unit. The housing unit has the first ball groove at a corner of the first short protrusion unit and, also, has an extension coupling unit extended from the first short protrusion unit. The outer surface of one end of the stem unit is inserted into the through space to face the sealing groove unit, and the outer circumference of the other side of the stem unit has the third short protrusion unit.

Description

Swivel joint

The present invention relates to a swivel joint, and more particularly to a swivel joint with improved sealing and durability.

Generally, swivel jonit refers to a pipe connecting mechanism for connecting two pipes through which various fluids, such as oil, water, air, gas, and chemicals, are rotatable.

Such swivel joints are widely used in a wide range of applications, such as fluid supply and transfer of loading arms of various machines, hose reel assembly, automatic car wash and plant machinery.

On the other hand, in recent years, the development of swivel joints applied to marine cranes, such as lifeboat fixed cranes of passenger ships, net cranes of fishing vessels, etc. are required. Here, unlike land swivel joints, marine swivel joints are required to develop technologies that can prevent corrosion due to salt as well as technologies to withstand leakage and hydraulic pressure.

Here, the swivel joint is formed with a flow path through which gas, fluid, and the like can move to the inside of the housing to prevent leakage of gas, fluid, and the like to the outside and to prevent damage due to high pressure fluid.

In addition, pipes are connected and fixed to the inlet end and the outlet end formed in the swivel joint, respectively, and the fluid introduced through the inlet end pipe passes through the flow path inside the swivel joint and flows to the outlet end pipe.

However, there is a problem that the durability of the high-pressure fluid flow is severely shaken or the durability is reduced due to the twisting and bending of the pipe. Moreover, when the length of the tube is longer, there is a risk that the tube is twisted and warped more seriously and is broken.

In addition, the connection portion of each pipe connected to the inlet and discharge end of the swivel joint has a problem in that the sealing performance is deteriorated during long-term use due to the high-pressure fluid movement to cause leakage. Accordingly, when leakage occurs between the swivel joint and the pipe or the swivel joint is broken, work in progress has to be stopped for maintenance, thereby deteriorating workability.

Korean Patent Publication No. 10-2014-0101892

In order to solve the above problems, the present invention relates to a swivel joint, and more particularly, to provide a swivel joint with improved sealing and durability.

In order to solve the above problems, the present invention is a through space is formed therein, the sealing groove portion is formed in the sealing means is interposed in one inner circumference of the through space, the first step portion and the other inner peripheral surface of the through space A housing portion having a second stepped portion formed sequentially, the first ball groove being formed at an edge of the first stepped portion, and having an extended fastening portion extending from the first stepped portion; A ball support provided with a cylindrical shape having a thickness corresponding to the stepped width of the first stepped portion, and having an outer circumferential surface coupled to the inner circumference of the extension fastening portion by screwing, and having a second ball groove formed at an end thereof; One end portion is inserted into the through space so that the outer surface is opposed to the sealing groove, and the third stepped portion is formed on the other outer peripheral surface, a third ball groove is formed on the outer surface opposite to the first ball groove and the second ball groove, the ball support portion A stem portion having a closed end portion whose radius decreases toward the end on the outer peripheral edge of the other end exposed to the outside of the stem; And a needle bearing part disposed between the second step portion and the third step portion to support the stem.

Here, it is preferable that a ball portion is provided between the first ball groove, the second ball groove and the third ball groove, in which a plurality of balls are inserted along the circumferential direction so as to support the stem.

In this case, the ball portion and the needle bearing portion is spaced apart at a predetermined distance so as to prevent the bending during the rotation of the stem portion, the third step portion and the third ball groove is preferably formed at a predetermined interval to each other.

In addition, the sealing groove is recessed in a radially outer side on one side of the inner peripheral surface of the housing portion opposite to the one end of the stem portion, the sealing means is inserted and disposed in the sealing groove sequentially and in close contact with one end of the stem portion It is preferred to include ring-shaped O-rings and backup rings.

In addition, the discharge expansion pipe portion is extended to the radially outer side toward the end toward one end inner circumferential surface so as to be in contact with the closed end portion is formed, the other side is provided with a pipe connecting portion connected to the high-pressure pipe, the hollow cylinder shape of the upper and lower sides opened However, it is preferable that the inner circumferential surface further includes a locking nut portion which is screwed with the other end outer surface of the stem portion and the inner circumferential surface the other side is engaged with and fixed to the pipe connection portion.

Through the above solution, the swivel joint according to the present invention provides the following effects.

First, since a ball part provided with a plurality of balls is disposed in a circumferential direction in a ball groove formed between the housing part, the ball support part, and the stem part, the ball part for preventing the stem part from being separated from the housing part supports the stem part to rotate. By simultaneously performing the function to prevent the twisting of the hydraulic pipe can be increased durability and stability.

Second, as the needle bearing parts rotatably supporting the inner wall surface of the second stepped portion of the ball portion and the housing portion and the outer surface of the stem portion are disposed at a predetermined distance, bending due to external force applied to the stem portion is prevented. Since the bearing capacity is significantly improved, the sealing performance can be significantly increased.

Third, a sealing means of a double sealing structure including an O-ring and a back-up ring is inserted into the sealing groove so that the fluid between the housing part and the stem part is leaked between the housing part and the stem part. Corrosion and breakage that can occur as a result are prevented in advance, thereby increasing stability and durability.

1 is an exploded perspective view showing a swivel joint according to an embodiment of the present invention.
Figure 2 is a perspective view showing a state in which the swivel joint is coupled according to an embodiment of the present invention.
3 is a cross-sectional view of the swivel joint according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail a swivel joint according to a preferred embodiment of the present invention.

1 is an exploded perspective view showing a swivel joint according to an embodiment of the present invention, Figure 2 is a perspective view showing a state in which the swivel joint is coupled according to an embodiment of the present invention, Figure 3 is an embodiment of the present invention Sectional view of the swivel joint according to.

As shown in Figures 1 to 3, the swivel joint 100 according to an embodiment of the present invention is the housing portion 10, the ball support portion 20, the stem portion 30, the ball portion 40, and the needle bearing A portion 50 is included.

First, it is preferable that the through space 1 is formed in the housing part 10 by opening up and down. In addition, an inflow end portion 11 having a first screw thread 11a may be formed on an inner circumferential surface of the housing portion 10 in which the through space 1 is formed to fasten and fix a hydraulic pipe (not shown). In addition, the inner diameter of the inlet end 11 may be provided to correspond to the outer diameter of the hydraulic pipe (not shown). Accordingly, the hydraulic pipe (not shown) is connected to the housing part 10 so that a high pressure fluid may flow into the through space 1 inside the swivel joint 100.

In addition, the one side inner circumference of the through space (1) is preferably formed in the recessed recess 15, the sealing means 15a, 15b is interposed. In detail, the sealing groove 15 is preferably recessed in a radially outer side on one side of the inner circumferential surface of the housing portion 10 opposite to one end of the stem portion 30. In this case, the sealing means 15 may be inserted into the sealing means (15a, 15b).

Here, the sealing means (15a, 15b) is in close contact with the one end of the stem portion 30 includes an O-ring (15a) for sealing to prevent leakage between the housing portion 10 and the stem portion 30 desirable. In addition, when the O-ring 15a is inserted into the sealing groove 15 alone, the O-ring 15a may be pressurized according to the twist of the stem portion 30 to the sealing means 15a and 15b. A backup ring 15b may be included to double seal the oil leakage prevention. Here, the o-ring 15a and the backup ring 15b may be provided with a rubber material or the like to closely contact and seal between the housing part 10 and the stem part 30.

Accordingly, the sealing means 15a and 15b of the double sealing structure including the o-ring 15a and the backup ring 15b are sealed to seal between the housing part 10 and the stem part 30. It is inserted into the groove part 15. Accordingly, since the fluid introduced into the swivel joint 100 is leaked between the housing part 10 and the stem part 30, corrosion and breakage that may occur may be prevented in advance, thereby increasing stability and durability. have.

In addition, it is preferable that the first stepped part 13 and the second stepped part 12 are sequentially formed on the other inner circumferential surface of the through space 1. That is, it is preferable that the first stepped part 13 and the second stepped part 12 are formed on the inner circumferential surface of the housing part 10.

Here, the second stepped part 12 may have a stepped recessed radially outward at the other side of the through space 1 such that one end of the needle bearing part 50 is seated. At this time, the radial width of the second stepped portion 12 is the radius of the needle bearing portion 50 such that the needle bearing portion 50 is closely disposed between the housing portion 10 and the stem portion 30. It is preferable that it is formed substantially corresponding to the direction length.

In addition, the first stepped part 13 may have a stepped recess formed radially outward from an inner wall surface of the second stepped part 12 so that the ball part 40 is disposed. At this time, the first ball groove 16 is preferably formed at the edge of the first stepped portion 13.

Referring to FIG. 3, the first ball groove 16 may be formed by recessing an edge of the first stepped portion 13 corresponding to a spherical shape along the circumferential direction. Here, the first ball groove 16 may be formed to be spaced apart from the ball portion 40 disposed between the second ball groove 24 and the third ball groove 32 which will be described later. At this time, the space between the first ball groove 16 and the ball portion 40 is preferably formed a free space.

Accordingly, between the ball portion 40 and the housing portion 10 for supporting the stem portion 30 is formed recessed so that the corner of the first stepped portion 13 corresponds to the spherical shape in the circumferential direction Since the free space is formed according to the separation, the housing part 10 does not wear even when used for a long time, and thus durability may be significantly increased.

Further, when the stem portion 30 swings in the vertical direction as the fluid moves at high pressure, the ball portion 40 is formed in the first ball groove 16 and the third ball groove 32 formed in a spherical shape. Since the stem portion 30 can be rotatably supported, stability can be significantly increased.

And, the extension fastening portion 14 is preferably formed extending from the first step portion (13). Here, the extension fastening portion 14 is formed integrally extending in the other direction from the body portion, the second screw thread 14b may be formed on the inner peripheral surface.

In addition, the housing part 10 may be provided with a metal material which is easy to purchase SCM415 and the like and has excellent strength and hardness. In addition, a first decut part 15 may be formed at one side of the outer surface of the housing part 10 in a plurality of decut surfaces at predetermined intervals along the circumferential direction.

On the other hand, the ball support portion 20 is provided in a cylindrical shape having a thickness corresponding to the stepped width of the first stepped portion 13, the outer circumferential surface of the second screw thread (14b) and the screw thread inner periphery of the extension portion 14 Is fastened and coupled, it is preferable that the second ball groove 24 is formed at the end. In detail, the ball supporting part 20 is coupled to the extension fastening part 14, and the hollow 21 having an upper and lower sides opened in the axial direction so as to communicate with the through space 1 inside the ball supporting part 20. Is preferably formed. In this case, the inner circumferential surface of the ball support 20 in which the hollow 21 is formed may be provided to correspond to the circumferential shape. In addition, the ball support part 20 may be provided with a metal material which is easy to purchase SCM415 and the like and has excellent strength and hardness.

In addition, the ball support 20 may be provided with a size corresponding to the outer diameter of the extension fastening portion 14 so that the cover body 22 contacts the end of the extension fastening portion 14. In addition, the fastening part 23 may extend in one direction from an inner end of the cover body 22 to be inserted into the extension fastening part 14. In this case, a third screw thread 23a may be formed on the outer circumferential surface of the fastening portion 23 so as to be screwed with the second screw thread 14a. Accordingly, since the extension fastening portion 14 and the cover body 22 are screwed into close contact with each other, corrosion may be prevented as seawater flows between the housing portion 10 and the ball support portion 20.

On the other hand, it is preferable that the second ball groove 24 is formed at one end of the ball support part 20. In detail, the second ball groove 24 is formed to be recessed so that a mating surface is formed in a spherical shape from the inner end edge of the fastening portion 23 of the ball support portion 20 to the radially outer side, and is formed to extend along the circumferential direction. desirable. Here, the second ball groove 24 is recessed to form a recessed end surface of the second ball groove 24 radially inward so that the ball portion 40 is prevented from being separated from the second ball groove 24 when the ball portion 40 is inserted into the second ball groove 24. Can be extended.

In addition, a second decut portion 20a having a decut surface may be formed on one side of the outer surface of the cover body 22. Of course, in some cases, a plurality of decut surfaces may be formed along the circumferential direction on the outer surface of the cover body 22.

On the other hand, the stem portion 30 is preferably inserted into the through space (1) so that the outer surface of one end is opposed to the sealing groove (15). At this time, the outer surface of one end of the stem portion 30 is opposite to the sealing groove 15 means that the one end of the inserted stem portion 30 is arranged to contact the sealing groove 15.

Here, the stem portion 30 is formed with a through flow passage 2 penetrating in the vertical direction in the interior of the stem body portion 31 formed in the longitudinal direction to be inserted into the through space 1 and the hollow 21. This is preferred. At this time, the inner circumferential surface of the stem body portion 31 in which the through flow passage 2 is formed may be formed in a circumferential shape so that the high pressure fluid introduced into the through space 1 may flow into the through flow passage 2. .

In addition, it is preferable that the third step portion 33 is formed on the other outer circumferential surface of the through space 1. That is, the outer diameter of one end portion 31a of the stem portion 30 is smaller than the outer diameter of the stem body portion 31 so that the one end portion 31a of the stem portion 30 and the stem body portion 31 of the stem portion 30 are formed. Preferably, a step is formed at the boundary. At this time, one end portion 31a of the stem portion 30 is preferably formed integrally extending from the stem body portion 31.

In addition, the radial width of the third step portion 33 is the radius of the needle bearing portion 50 such that the needle bearing portion 50 is closely disposed between the housing portion 10 and the stem portion 30. It is preferable that it is formed substantially corresponding to the direction length. Accordingly, the needle bearing part 50 may be disposed in a space formed between the second stepped part 12 and the third stepped part 33. The detailed description will be described later.

In addition, the stem portion 30 is preferably formed with the third ball groove 32 on the outer surface facing the first ball groove 16 and the second ball groove 24. In detail, the third ball groove 32 is recessed inward in the radial direction such that a mating surface is formed in a spherical shape on the outer surface of the stem portion 30 opposite to the first ball groove 16 and the second ball groove 24. It is preferably formed extending in the circumferential direction.

Accordingly, the ball portion 40 is disposed between the second ball groove 24 and the third ball groove 32 so that the stem portion 30 is rotatably supported by the ball portion 40 and the stem portion. Since departure of the 30 is prevented, durability and stability can be significantly increased. Further, when the stem portion 30 swings in the vertical direction as the fluid moves at high pressure, the ball portion 40 is formed in the first ball groove 16 and the third ball groove 32 formed in a spherical shape. Since the stem portion 30 can be rotatably supported, stability can be significantly increased.

On the other hand, the stem portion 30 may be formed with a closed end portion 35a which is formed to be recessed in a radially inward direction toward the other end on the outer peripheral edge of the other end exposed to the outside of the ball support portion 20. In detail, the other end of the stem portion 30 is formed integrally extending from the stem body portion 31, the discharge end portion 35 is formed on the extended outer peripheral surface is formed with a fourth screw thread (35b). At this time, the closed end portion 35a may be formed to be recessed in a radially inward direction toward the end, and may be formed at a predetermined radius reduction rate in a radially inward direction to form an outer surface of a spherical shape.

In addition, the hermetic end 35a may be hermetically contacted with a discharge expansion pipe which is extended radially outward toward one end on an inner circumferential surface of one side of the pipe connecting portion b to be described later. At this time, the meaning of the hermetic contact is preferably understood to mean that the hermetic end 35a and the discharge expansion tube are hermetically sealed to prevent surface leakage or surface contact.

Accordingly, the pipe is extended radially outwardly at the end of the pipe connecting portion (b) to the closed end portion (35a) formed to be recessed radially inward toward the other end to the outer peripheral edge of the other end portion exposed to the outside of the stem portion (30) Since the discharge expansion pipe part is hermetically contacted to prevent leakage and thus damage is prevented, sealability and durability may be significantly increased.

In addition, the stem portion 30 may be provided with a protrusion 34 which protrudes radially outward along the circumferential direction at the other end exposed to the outside of the ball support 20. Here, the protrusion 34 is preferably formed integrally extending from the stem body portion 31. In addition, a third decut portion 30b having a plurality of decut surfaces formed along the circumferential direction may be formed on an outer surface of the protrusion 34. In addition, the stem part 30 may be provided with a metal material which is easy to purchase such as SCM415 and has excellent strength and hardness.

In addition, a rubber sealing ring 30a may be disposed between the protrusion 34 and the cover body 22. Accordingly, the inflow of seawater is prevented between the ball support part 20 and the stem part 30 so that corrosion of the inside of the swivel joint 100 can be prevented in advance. Furthermore, the sealing ring 30a is disposed between the ball supporting portion 20 and the stem portion 30 so that the contact between the ball supporting portion 20 and the stem portion 30 when the stem portion 30 is rotated. Since it prevents abrasion by the durability of the swivel joint 100 can be increased.

On the other hand, the ball portion 40 is preferably a plurality of balls are inserted in the circumferential direction between the first ball groove 16, the second ball groove 24 and the third ball groove 32. Accordingly, the ball portion 40 provided with a plurality of balls is the first ball groove 16, each of which has a mating surface in each of the housing portion 10, the ball support portion 20 and the stem portion 30 in a spherical shape, A mold is disposed between the second ball groove 24 and the third ball groove 32. Therefore, the ball portion 40 is rotated and supported by the stem portion 30, at the same time prevent the stem portion 30 from being separated from the housing portion 10 and the ball support portion 20, the twist of the inlet pipe Prevention and the durability and stability can be significantly increased.

In addition, the needle bearing part 50 may be disposed between the second stepped part 12 and the third stepped part 33 to support the stem part 30 in rotation. Here, the needle bearing portion 50 is preferably disposed between the inner wall surface of the second stepped portion 12 and the outer surface of the stem portion 30 so that the stem portion 30 is rotatably supported. Here, the needle bearing unit 50 is arranged in the groove formed on the inner circumferential surface of the ring member having a predetermined height in the vertical direction is arranged in a plurality of needle bearings in a predetermined interval, each needle bearing is provided to be rotatable Can be.

In addition, an inner side of the needle bearing part 50 may be disposed in close contact with the stem part 30, and an outer side of the needle bearing part 50 may be disposed in close contact with an inner wall surface of the second stepped part 12. . Accordingly, the needle bearing portion 50 provided between the inner wall surface of the second stepped portion 12 and the outer surface of the stem portion 30 is in frictional contact with one surface of the stem portion 30 so that the stem portion ( 30 can be rotatably supported.

In addition, the ball part 40 and the needle bearing part 50 may be spaced apart from each other at a predetermined distance so as to prevent bending during rotation of the stem part 30. That is, it is preferable that the third step portion 33 and the third ball groove 32 of the stem portion 30 are formed at predetermined intervals from each other. Here, when the interval between the third step portion 33 and the third ball groove 32 is formed smaller than the predetermined interval there is a fear that the bending occurs when the stem portion 30 rotates.

Therefore, as the ball part 40 and the needle bearing part 50 are spaced apart at a predetermined distance, bending due to an external force applied to the stem part 30 is prevented, and thus the bearing force is remarkably improved, thereby significantly increasing the sealing performance. Can be.

On the other hand, the swivel joint 100 is formed with a discharge expansion pipe which extends radially outward toward one end on the inner circumferential surface on one side inner circumferential surface so as to be in contact with the closed end (35a), the pipe connecting portion is connected to the discharge end side hydraulic pipe on the other side (b) may be further included. Of course, in some cases, the pipe connecting portion (b) and the discharge end side hydraulic pipe may be formed integrally.

In addition, the swivel joint 100 is provided with a hollow circumferential shape of the upper and lower sides, one side of the inner peripheral surface is screwed to the outer surface of the other end of the stem portion 30, the other side of the inner peripheral surface and the pipe connection (b) Engaged and fixed locking nut portion (a) may be further included.

And, in some cases, the inside is penetrated up and down to be inserted into and coupled to the discharge end 35, the thread is formed on the inner peripheral surface, the nipple portion may be further provided on the outer peripheral surface to reduce the radius toward the end. Accordingly, the nipple portion may be coupled to the discharge end 35 so that the end portion of the nipple portion and the pipe connection portion (b) may be contacted and fixed.

In this case, the terms "comprise", "comprise", or "include" described above mean that the corresponding component may be inherent unless otherwise stated, and thus, other components may be used. It should be construed as more to include other components than to exclude them. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. Terms commonly used, such as terms defined in a dictionary, should be interpreted to coincide with the contextual meaning of the related art, and shall not be interpreted in an ideal or excessively formal sense unless explicitly defined in the present invention.

As described above, the present invention is not limited to the above-described embodiments, but may be modified and implemented by those skilled in the art without departing from the scope of the claims of the present invention. Such modifications are within the scope of the present invention.

100: swivel joint 10: housing part
20: ball support portion 30: stem portion
40: ball part 50: needle bearing part

Claims (5)

A through space is formed therein, and a sealing groove portion in which a sealing means is interposed in one inner circumference of the through space is formed, and a first step portion and a second step portion are sequentially formed on the other inner circumferential surface of the through space. A housing portion having a first ball groove formed at an edge of the first step portion and having an extension fastening portion extending from the first step portion;
A ball supporting part provided with a cylindrical shape having a thickness corresponding to the step width of the first stepped part, and having an outer circumferential surface coupled with the inner circumference of the extension fastening part by screwing, and having a second ball groove formed at an end thereof;
The outer surface of one end is inserted into the through space so as to face the sealing groove, and a third stepped portion is formed on the other outer circumferential surface, and a third ball groove is formed on the outer surface opposite to the first ball groove and the second ball groove, A stem portion having a closed end portion whose radius decreases toward the end on the outer peripheral edge of the other end exposed to the outside of the stem; And
Swivel joint including a needle bearing portion disposed between the second step portion and the third step portion for supporting the stem portion rotation. The method of claim 1,
Swivel joint, characterized in that provided between the first ball groove, the second ball groove and the third ball groove a plurality of balls are inserted in the circumferential direction to support the rotation of the stem. The method of claim 2,
The ball part and the needle bearing part are spaced apart from each other at a predetermined distance to prevent bending when the stem is rotated, and the third step portion and the third ball groove are formed at predetermined intervals from each other. The method of claim 1,
The sealing groove is formed recessed in the radially outer side on one side of the inner peripheral surface of the housing portion opposed to one end of the stem portion,
The sealing means is a swivel joint, characterized in that it comprises a ring-shaped O-ring and the back-up ring is inserted into and disposed in the sealing groove sequentially in close contact with one end of the stem. The method of claim 1,
A discharge expansion pipe which extends radially outward toward one end on an inner circumferential surface of the one end so as to be in contact with the closed end, and a pipe connection part connected to the high pressure pipe on the other side thereof;
Swivel joint, characterized in that the upper and lower sides are provided in a hollow circumferential shape, the inner circumferential surface one side is screwed to the outer surface of the other end of the stem portion, and the inner circumferential surface further comprises a locking nut that is engaged and fixed to the pipe connection.

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