Rotary joint

Abstract

The present invention relates to a rotary joint that allows a fluid to flow inside a fixed body and inside a rotary body that rotates relative to the fixed body. In particular, the present invention relates to a rotary joint that can increase the operating time and can effectively prevent fluid leakage even when the pressure of the fluid flowing inside the rotary joint increases.

Description

rotary joint

[0001] The present invention relates to a rotary joint that allows fluid to flow between the interior of a fixed body and the interior of a rotating body that rotates relative to the fixed body.

[0002] A rotary joint is a connecting device that connects a fixed body and a rotating body that rotates relative to the fixed body, and supplies or discharges fluids such as coolant or cutting oil to the rotating body.

[0003] For example, it is used to supply heat media such as steam, hot water, and hot oil for heating to rotating drums, cylinders, etc., and refrigerants such as water, ammonia, and freon for cooling, or to supply compressed air or operating oil to rotating devices such as clutches and brakes that operate with fluids.

[0004] Rotary joints can be used in military radar systems to connect and rotate the radar.

[0005] The cooling medium for cooling the radar system has a circulating structure in which it cools the upper rotating body and then flows back into the lower non-rotating body.

[0006] Recently, as radar performance has improved, higher output and efficiency have been required, and water-cooling devices have to be applied to ensure sufficient cooling effect, and the cooling water is circulated at a high pressure (e.g., approximately 10 bar or more).

[0007] Accordingly, a leak-free supply and recovery of cooling water between the rotating body and the stationary body of the rotary joint used for radar rotation is required.

[0008] Additionally, wear on the surface of the fixture that comes into contact with the sealing portion of the rotary joint during radar operation may result in a shortened radar operating time. Therefore, there is a need to improve the wear resistance of the fixture, and a structure that facilitates rapid maintenance is required.

[0009] [Prior Art Literature]

[0010] [Patent Document]

[0011] (Patent Document 1) Korean Patent No. 10-1081891.

[0012] (Patent Document 2) Korean Patent No. 10-1845987.

[0013] The present invention has been devised to solve the above-mentioned problem, and aims to provide a rotary joint capable of improving operating time.

[0014] In addition, the present invention has been devised to solve the aforementioned problem, and aims to provide a rotary joint that can effectively prevent leakage of fluid even when the pressure of the fluid flowing inside the rotary joint increases.

[0015] A rotary joint according to one feature of the present invention comprises: a fixed body; a rotating body that rotates relative to the fixed body on the outside of the fixed body and has a supply channel and a return channel; a first chamber provided between the fixed body and the rotating body and communicating with the supply channel; a second chamber provided between the fixed body and the rotating body so as to be positioned below the first chamber and communicating with the return channel; a supply pipe provided in the fixed body and communicating with the first chamber; a return pipe provided in the fixed body and communicating with the second chamber; and a first sealing part provided between the fixed body and the rotating body and positioned above the first chamber; wherein the first sealing part comprises: a first-first sealing member having a first-first O-ring provided on the outside; a first-second sealing member having a first-second O-ring provided on the outside and disposed below the first-first sealing member; It includes a first-third sealing member having a first-third O-ring on the outside and positioned below the first-second sealing member; a first-first bending prevention ring interposed between the first-first sealing member and the first-second sealing member; and a first-second bending prevention ring interposed between the first-second sealing member and the first-third sealing member.

[0016] In addition, the first sealing portion further includes a first-third bending prevention ring disposed on the upper portion of the first-first sealing member; and a first-first spacer disposed on the lower portion of the first-third sealing member.

[0017] In addition, the fixture is made of aluminum, and a coating layer is provided on the outer surface of the fixture that comes into contact with the first sealing portion.

[0018] Additionally, the coating layer is coated with amorphous powder.

[0019] Additionally, the coating layer is provided inside a coating groove formed on the outer surface of the fixture.

[0020] In addition, it further includes a second sealing part provided between the fixed body and the rotating body and positioned between the lower part of the first chamber and the upper part of the second chamber; and a third sealing part provided between the fixed body and the rotating body and positioned at the lower part of the second chamber; wherein the second sealing part comprises: a 2-1 sealing member having a 2-1 O-ring provided on the outside; a 2-2 sealing member having a 2-2 O-ring provided on the outside and positioned at the lower part of the 2-1 sealing member; a 2-1 bending prevention ring interposed between the 2-1 sealing member and the 2-2 sealing member; a 2-1 holder disposed on the upper part of the 2-1 sealing member and coupled to the rotating body; a 2-1 spacer interposed between the 2-1 holder and the 2-1 sealing member; A second-second holder disposed on the lower side of the second-second sealing member and coupled to the rotating body; and a second-second spacer interposed between the second-second holder and the second-second sealing member; wherein the third sealing part comprises: a third-first sealing member having a third-first O-ring provided on the outer side; a third-second sealing member having a third-second O-ring provided on the outer side and disposed on the lower side of the third-first sealing member; a third-third sealing member having a third-third O-ring provided on the outer side and disposed on the lower side of the third-2 sealing member; a third-first bending prevention ring interposed between the third-first sealing member and the third-2 sealing member; a third-2 bending prevention ring interposed between the third-2 sealing member and the third-3 sealing member; It includes a 3-1 holder arranged on the upper part of the 3-1 sealing member and coupled to the rotating body; a 3-1 spacer interposed between the 3-1 holder and the 3-1 sealing member; a 3-2 holder arranged on the lower part of the 3-3 sealing member and coupled to the rotating body; and a 3-2 spacer interposed between the 3-2 holder and the 3-3 sealing member.

[0021] In addition, the first sealing portion further includes: first-1 to first-3 spring grooves having a shape sunken upward from the lower surface of each of the first-1 to first-3 sealing members; first-1 to first-3 ribs having a shape protruding downward from the lower surface of each of the first-1 to first-3 sealing members and positioned on the inner side of each of the first-1 to first-3 spring grooves; and first-1 to first-3 springs inserted into each of the first-1 to first-3 spring grooves to press each of the first-1 to first-3 ribs inward; and the second sealing portion further includes: a second-1 spring groove having a shape sunken downward from the upper surface of the second-1 sealing member; a second-2 spring groove having a shape sunken upward from the lower surface of the second-2 sealing member; The second-first rib has a shape protruding upward from the upper portion of the second-first sealing member and is located on the inner side of the second-first spring groove; the second-second rib has a shape protruding downward from the lower portion of the second-second sealing member and is located on the inner side of the second-second spring groove; and the second-first and second-second springs are inserted into the second-first and second-second spring grooves, respectively, to press the second-first and second-second ribs inward, respectively; and the third sealing portion further includes third-first to third-third spring grooves having a shape recessed downward from the upper surface of each of the third-1 to third-3 sealing members; third-first to third-3 ribs have a shape protruding upward from the upper portion of each of the third-1 to third-3 sealing members and are located on the inner side of each of the third-1 to third-3 spring grooves. And it further includes 3-1 to 3-3 springs inserted into each of the 3-1 to 3-3 spring grooves to press each of the 3-1 to 3-3 ribs inward.

[0022] In addition, a first sealing part installation space, in which the first sealing part is arranged, is formed by a space between the rotating body and the fixed body, and is located at an upper portion of the first chamber; a third sealing part installation space, in which the third sealing part is arranged, is formed by a space between the rotating body and the fixed body, and is located at a lower portion of the second chamber; a first drain hole provided on the inner side of the rotating body so as to communicate with one side of the first sealing part installation space; a second drain hole provided on the inner side of the rotating body so as to communicate with one side of the third sealing part installation space; a first drain path that connects the first drain hole and the second drain hole; a third drain hole provided on the outer side of the fixed body so as to communicate with the third sealing part installation space; And a second drain path communicating with the third drain hole to recover fluid leaked into the first and third sealing part installation spaces; wherein the first sealing part further includes a first-first drain groove provided on one side of the first-first bending prevention ring; a first-second drain groove provided on one side of the first-second bending prevention ring; and a first-third drain groove provided on one side of the first-third bending prevention ring; and the third sealing part further includes a third-first drain groove provided on one side of the third-first bending prevention ring; and a third-second drain groove provided on one side of the third-second bending prevention ring; wherein the first-first to first-third drain grooves communicate with the first drain hole, and the third-first and third drain grooves communicate with the second and third drain holes.

[0023] In addition, the fixture further includes a first air vent passage connected to the upper portion of the first chamber to discharge air from the first chamber.

[0024] In addition, the device further includes a first temperature sensor provided in the fixture to measure the temperature of the first sealing portion.

[0025] In addition, the present invention further includes a first inclined portion provided on the upper surface of the first protrusion of the fixed body located at the upper portion of the first chamber so as to be inclined inwardly as the upper direction increases; and a second inclined portion provided on the upper surface of the second protrusion of the fixed body located at the lower portion of the first chamber so as to be inclined inwardly as the upper direction increases.

[0026] In addition, it further includes a third chamber provided inside the fixture, located at the lower portion of the second chamber, and communicating with the supply pipe; a fourth chamber provided inside the fixture, located at the lower portion of the second chamber, and communicating with the recovery pipe; a first communication chamber provided between the lower portion of the first chamber and the upper portion of the third chamber within the fixture so as to communicate the first chamber and the third chamber; and a second communication chamber provided between the lower portion of the second chamber and the upper portion of the fourth chamber within the fixture so as to communicate the second chamber and the fourth chamber.

[0027] According to another feature of the present invention, a rotary joint comprises: a fixed body; a rotating body that rotates relative to the fixed body on the outside of the fixed body and has a supply channel and a return channel; a first chamber provided between the fixed body and the rotating body and communicating with the supply channel; a second chamber provided between the fixed body and the rotating body so as to be positioned below the first chamber and communicating with the return channel; a supply pipe provided in the fixed body and communicating with the first chamber; a return pipe provided in the fixed body and communicating with the second chamber; and a second sealing part provided between the fixed body and the rotating body and positioned between the lower portion of the first chamber and the upper portion of the second chamber; wherein the second sealing part comprises: a second-first sealing member having a second-1 O-ring provided on the outside; a second-2 sealing member having a second-2 O-ring provided on the outside and disposed below the second-1 sealing member; and a second-first bending prevention ring interposed between the second-first sealing member and the second-second sealing member.

[0028] A rotary joint according to another feature of the present invention further comprises: a fixed body; a rotating body that rotates relative to the fixed body on the outside of the fixed body and has a supply channel and a return channel; a first chamber provided between the fixed body and the rotating body and communicating with the supply channel; a second chamber provided between the fixed body and the rotating body so as to be positioned below the first chamber and communicating with the return channel; a supply pipe provided in the fixed body and communicating with the first chamber; a return pipe provided in the fixed body and communicating with the second chamber; and a third sealing part provided between the fixed body and the rotating body and positioned below the second chamber; wherein the third sealing part comprises: a 3-1 sealing member having a 3-1 O-ring provided on the outside; a 3-2 sealing member having a 3-2 O-ring provided on the outside and positioned below the 3-1 sealing member; It includes a 3-3 sealing member having a 3-3 O-ring on the outside and positioned below the 3-2 sealing member; a 3-1 bending prevention ring interposed between the 3-1 sealing member and the 3-2 sealing member; and a 3-2 bending prevention ring interposed between the 3-2 sealing member and the 3-3 sealing member.

[0029] According to the rotary joint of the present invention as described above, the following effects are provided.

[0030] The first sealing portion is disposed at the upper portion of the first chamber, the second sealing portion is disposed at the lower portion of the first chamber and the upper portion of the second chamber, and the third sealing portion is disposed at the lower portion of the second chamber, thereby preventing leakage of the fluid flowing through the first chamber and the second chamber.

[0031] The spacer prevents the sealing member from being in direct contact with the holder or rotating body, thereby preventing damage to the sealing member.

[0032] The holder is formed in the shape of a plate spring with elasticity, so that the sealing member can be prevented from being damaged by pressure.

[0033] The spring presses the rib inward so that the inner surface of the rib and the fixed body are always in contact, ensuring high sealing performance.

[0034] A coating layer is formed on the outer surface of the fixture, thereby improving the wear resistance of the outer surface of the fixture that comes into contact with the inner surface of the sealing portion, thereby extending the life of the rotary joint.

[0035] Since the coating layer is formed inside the coating groove, the coating layer is firmly formed inside the coating groove, and the peeling off of the coating layer can be prevented.

[0036] The fluid leaked through the fluid drain section can be easily recovered, thereby preventing the rotary joint from failing due to fluid leakage.

[0037] When connecting the rotating body and the fixed body through the first and second inclined portions of the first and second protrusions, the ribs can be effectively prevented from being damaged.

[0038] Figures 1 and 2 are perspective views of the rotary joint of the present invention.

[0039] Figure 3 is a cross-sectional view taken along line A-A' of Figure 1.

[0040] Fig. 4 is a cross-sectional view taken along line B-B' of Fig. 1.

[0041] Figure 5 is a cross-sectional view taken along line C-C' of Figure 3.

[0042] Figure 6 is a cross-sectional view taken along line D-D' of Figure 3.

[0043] Fig. 7 is a cross-sectional view taken along line E-E' of Fig. 3.

[0044] Figure 8 is an enlarged view of area G of Figure 4.

[0045] Fig. 9 is an exploded perspective view of the first sealing part of Fig. 8.

[0046] Figure 10 is an enlarged view of area H of Figure 4.

[0047] Fig. 11 is an exploded perspective view of the second sealing part of Fig. 10.

[0048] Figure 12 is an enlarged view of area F of Figure 3.

[0049] Figure 13 is an enlarged view of area I of Figure 4.

[0050] Fig. 14 is an exploded perspective view of the third sealing part of Fig. 13.

[0051] Figure 15 is a diagram illustrating a process of forming a coating groove on the surface of a fixture of the present invention and forming a coating layer in the coating groove.

[0052] The following merely exemplifies the principles of the invention. Therefore, those skilled in the art will be able to implement the principles of the invention and invent various devices within the scope and spirit of the invention, even if not explicitly described or illustrated herein. Furthermore, all conditional terms and embodiments listed herein are expressly intended, in principle, to facilitate understanding of the invention's concepts and should be understood as being in no way limiting to the specifically enumerated embodiments and conditions.

[0053] The above-described purposes, features and advantages will become clearer through the following detailed description with reference to the attached drawings, so that a person having ordinary skill in the art to which the invention pertains can easily practice the technical idea of ​​the invention.

[0054] Embodiments described herein will be described with reference to cross-sectional and / or perspective views, which are ideal illustrative examples of the present invention. The thicknesses of films and regions, etc., shown in these drawings are exaggerated for the purpose of effectively explaining the technical contents. The shapes of the illustrative drawings may be modified due to manufacturing techniques and / or tolerances. In addition, the number of metal moldings shown in the drawings is only a portion of the number of examples. Therefore, embodiments of the present invention are not limited to the specific shapes shown, but also include changes in shapes produced according to the manufacturing process. Technical terms used herein are only used to describe specific embodiments and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this specification, it should be understood that terms such as “include” or “have” are intended to specify the presence of a feature, number, step, operation, component, part, or combination thereof described in this specification, but do not preclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0055] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. In describing various embodiments below, components that perform the same function will be given the same names and reference numbers for convenience, even if the embodiments differ. Furthermore, for convenience, descriptions of configurations and operations already described in other embodiments will be omitted.

[0056] The rotary joint (10) described below can be used in a connection that rotates a radar in a defense radar system. In this case, the fluid flowing through the internal passage of the rotary joint (10) may be coolant, and the coolant may cool the upper rotor of the radar system along the supply passage (210) of the fixture (100), and then be circulated back into the fixture (100) through the return passage (220) of the fixture (100).

[0057] Hereinafter, the rotary joint (10) of the present invention will be described with reference to FIGS. 1 to 15.

[0058] FIG. 1 and FIG. 2 are perspective views of the rotary joint of the present invention, FIG. 3 is a cross-sectional view taken along line A-A' of FIG. 1, FIG. 4 is a cross-sectional view taken along line B-B' of FIG. 1, FIG. 5 is a cross-sectional view taken along line C-C' of FIG. 3, FIG. 6 is a cross-sectional view taken along line D-D' of FIG. 3, FIG. 7 is a cross-sectional view taken along line E-E' of FIG. 3, FIG. 8 is an enlarged view of area G of FIG. 4, FIG. 9 is an exploded perspective view of the first sealing part of FIG. 8, FIG. 10 is an enlarged view of area H of FIG. 4, FIG. 11 is an exploded perspective view of the second sealing part of FIG. 10, FIG. 12 is an enlarged view of area F of FIG. 3, FIG. 13 is an enlarged view of area I of FIG. 4, FIG. 14 is an exploded perspective view of the third sealing part of FIG. 13, and FIG. 15 is a view showing a method of forming a coating groove on the surface of a fixture of the present invention, and forming a coating groove in the coating groove. This is a diagram illustrating the process of forming a coating layer.

[0059] As illustrated in FIGS. 1 to 14, the rotary joint (10) of the present invention comprises a fixed body (100), a rotating body (200) that rotates relative to the fixed body (100) on the outside of the fixed body (100) and is provided with a supply path (210) and a recovery path (220), a first chamber (351) provided between the fixed body (100) and the rotating body (200) and communicates with the supply path (210), a second chamber (352) provided between the fixed body (100) and the rotating body (200) so as to be positioned below the first chamber (351) and communicates with the recovery path (220), a supply pipe (161) provided in the fixed body (100) and communicates with the first chamber (351), a recovery pipe (162) provided in the fixed body (100) and communicates with the second chamber (352), A third chamber (353) provided inside the fixture (100), located at the lower part of the second chamber (352), and communicating with the supply pipe (161), a fourth chamber (354) provided inside the fixture (100), located at the lower part of the second chamber (352), and communicating with the recovery pipe (162), a first communication chamber (151) provided between the lower part of the first chamber (351) and the upper part of the third chamber (353) inside the fixture (100) to communicate the first chamber (351) and the third chamber (353), a second communication chamber (152) provided at the lower part of the second chamber (352) and the upper part of the fourth chamber (354) inside the fixture (100) to communicate the second chamber (352) and the fourth chamber (354), A first sealing part (400) provided between a fixed body (100) and a rotating body (200) and located on the upper side of the first chamber (351), a second sealing part (500) provided between the fixed body (100) and the rotating body (200) and located between the lower side of the first chamber (351) and the upper side of the second chamber (352), a third sealing part (600) provided between the fixed body (100) and the rotating body (200) and located on the lower side of the second chamber (352), and a first sealing part (400) are arranged, and a first sealing part installation space (371) formed as a space between the rotating body (200) and the fixed body (100) and located on the upper side of the first chamber (351), and a second sealing part (500) are arranged,It may be configured to include a space between the rotating body (200) and the fixed body (100), a second sealing part installation space (372) located at the lower part of the first chamber (351) and the upper part of the second chamber (352), and a third sealing part (600) arranged therein, and a third sealing part installation space (373) located at the lower part of the second chamber (352), which is formed by the space between the rotating body (200) and the fixed body (100).

[0060] Fixed body (100) and rotating body (200)

[0061] Below, the fixed body (100) and the rotating body (200) are described.

[0062] As shown in FIGS. 1 to 8, 10, 12 and 13, the fixed body (100) is connected to the rotating body (200) by the first bearing part (310) and the second bearing part (320), and is fixed without rotating when the rotating body (200) rotates.

[0063] The fixture (100) may be made of aluminum.

[0064] The fixture (100) can be configured to include an upper fixture (100a) and a lower fixture (100b).

[0065] The upper fixed body (100a) is inserted and provided on the inside of the rotating body (200).

[0066] The upper fixture (100a) may be configured to include a first protrusion (111) protruding outwardly from the upper fixture (100a), a second protrusion (112) positioned below the first protrusion (111) and protruding outwardly from the upper fixture (100a), and a third protrusion (113) positioned below the second protrusion (112) and protruding outwardly from the upper fixture (100a).

[0067] The rotary joint (10) may further include a first bearing part (310) and a second bearing part (320) that connect the fixed body (100) and the rotating body (200).

[0068] The first bearing part (310) connects the upper part of the upper fixed body (100a) and the upper part of the rotating body (200). Specifically, the first bearing part (310) is located at the upper part of the first protrusion (111), the upper part of the first sealing part installation space (371), the upper part of the first sealing part (400), and the upper part of the first chamber (351).

[0069] The first bearing part (310) is provided with a plurality of first bearings (311) interposed between the outer side of the upper part of the upper fixed body (100a) and the inner side of the upper part of the rotating body (200).

[0070] The second bearing part (320) connects the lower part of the upper fixed body (100a) and the lower part of the rotating body (200). Specifically, the second bearing part (320) is located at the lower part of the third protrusion (113), the lower part of the third sealing part installation space (373), the lower part of the third sealing part (600), and the lower part of the second chamber (352).

[0071] The second bearing part (320) is provided with a plurality of second bearings (321) interposed between the outer side of the lower part of the upper fixed body (100a) and the inner side of the lower part of the rotating body (200).

[0072] A plurality of first bearings (311) and a plurality of second bearings (321) have the function of assisting the rotation of the rotating body (200) when the rotating body (200) rotates relative to the fixed body (100).

[0073] The lower fixture (100b) is connected to the lower portion of the upper fixture (100a). Therefore, the lower fixture (100b) is fixed and does not rotate when the rotating body (200) rotates.

[0074] The lower fixture (100b) is provided with a flange (120).

[0075] The flange (120) is formed to protrude in the left and right directions so that the rotary joint (10) can be easily connected to other parts.

[0076] A supply pipe (161) is provided on the rear left side of the lower fixture (100b).

[0077] The supply pipe (161) is connected to an external fluid supply unit (not shown) and functions to flow the fluid supplied from the fluid supply unit into the rotary joint (10).

[0078] A recovery pipe (162) is provided on the rear right side of the lower fixture (100b).

[0079] The recovery pipe (162) is connected to an external fluid recovery unit (not shown) and functions to flow the fluid recovered through the recovery pipe (162) to the external fluid recovery unit, thereby recovering the fluid inside the rotary joint (10) to the outside of the rotary joint (10).

[0080] The supply pipe (161) is connected to the first chamber (351), the third chamber (353), and the first communication chamber (151). Therefore, the fluid flows through the supply pipe (161), the third chamber (353), the first communication chamber (151), and the first chamber (351) to the supply path (210).

[0081] The recovery pipe (162) is connected to the second chamber (352), the fourth chamber (354), and the second communication chamber (152). Therefore, the fluid flows through the recovery path (220), the second chamber (352), the second communication chamber (152), and the fourth chamber (354) to the recovery pipe (162) and is recovered.

[0082] A hollow (105) is formed on the inside of the fixture (100), that is, the upper fixture (100a) and the lower fixture (100b), which penetrates the interior of the fixture (100) from top to bottom.

[0083] The lower surface of the lower fixture (100b) is closed, and thus the lower surface of the hollow (105) is closed.

[0084] The rotating body (200) is provided on the outside of the fixed body (100), i.e., the upper fixed body (100a).

[0085] The rotating body (200) rotates relative to the fixed body (100) by a driving unit (not shown).

[0086] A supply path (210) is provided at the front of the rotor (200), and a recovery path (220) is provided at the rear of the rotor (200).

[0087] The supply flow path (210) has the function of supplying fluid to an external component connected to the rotary joint (10).

[0088] The recovery path (220) has the function of recovering the fluid supplied to the external component through the supply path back into the rotary joint (10) and flowing it to the external fluid recovery section.

[0089] First to fourth chambers (351, 352, 353, 354) and first and second communication chambers (151, 152)

[0090] Hereinafter, the first to fourth chambers (351, 352, 353, 354) and the first and second communication chambers (151, 152) will be described.

[0091] The first chamber (351) is provided between the fixed body (100) and the rotating body (200). Specifically, the first chamber (351) is formed by the lower space of the first protrusion (111) of the upper fixed body (100a) and the inner space of the rotating body (200) when the fixed body (100) and the rotating body (200) are combined.

[0092] The first chamber (351) is provided inside the fixture (100).

[0093] The first chamber (351) has a cross-section in the shape of a circular ring.

[0094] The front of the first chamber (351) is connected to the supply path (210).

[0095] The lower part of the left area of ​​the first chamber (351) is communicated with the first communication chamber (151).

[0096] A first bulkhead (131) is formed between the first chamber (351) and the hollow space (105). Therefore, the first chamber (351) and the hollow space (105) are not connected to each other and form separate, independent spaces.

[0097] The supply euro (210) and the first communication chamber (151) are communicated by the first chamber (351).

[0098] The second chamber (352) is provided between the fixed body (100) and the rotating body. Specifically, the second chamber (352) is formed by the lower space of the second protrusion (112) of the upper fixed body (100a) and the inner space of the rotating body (200) when the fixed body (100) and the rotating body (200) are combined.

[0099] The second chamber (352) is located below the first chamber (351).

[0100] The second chamber (352) has a cross-section in the shape of a circular ring.

[0101] The first chamber (351) and the second chamber (352) have the same shape.

[0102] The lower part of the right area of ​​the second chamber (352) is connected to the second communication chamber (152).

[0103] A first bulkhead (131) is formed between the second chamber (352) and the hollow space (105). Therefore, the second chamber (352) and the hollow space (105) are not connected to each other and form independent spaces.

[0104] A second bulkhead (132) is formed between the second chamber (352) and the first communication chamber (151). Therefore, the second chamber (352) and the first communication chamber (151) do not communicate with each other and form separate, independent spaces.

[0105] The recovery urea (220) and the second communication chamber (152) are communicated by the second chamber (352).

[0106] The third chamber (353) is provided inside the fixture (100).

[0107] The third chamber (353) is positioned on the left side with respect to the center point of the fixture (100) and has a ring-shaped cross-section with a curvature so as to have a smaller area than a semicircular ring.

[0108] The left rear of the third chamber (353) is connected to the supply pipe (161).

[0109] The upper part of the third chamber (353) is vertically connected to the lower part of the first communication chamber (151).

[0110] The first communication chamber (151) is provided between the lower part of the first chamber (351) and the upper part of the third chamber (353) inside the fixture (100).

[0111] The first communication chamber (151) vertically connects the first chamber (351) and the third chamber (353).

[0112] The first communication chamber (151), like the third chamber (353), is positioned to the left of the center point of the fixture (100) and has a ring-shaped cross-section with a curvature so as to have a smaller area than a semicircular ring.

[0113] The first communication chamber (151) has the same shape as the third chamber (353).

[0114] A second bulkhead (132) is provided between the first communication chamber (151) and the second chamber (352) so that the first communication chamber (151) does not communicate with the second chamber (352).

[0115] The first communication chamber (151) is located inside a portion of the second chamber (352).

[0116] The fourth chamber (354) is provided inside the fixture (100).

[0117] The fourth chamber (354) is positioned on the right side with respect to the center point of the fixture (100) and has a ring-shaped cross-section with a curvature so as to have a smaller area than a semicircular ring.

[0118] The right rear of the 4th chamber (354) is connected to the recovery pipe (162).

[0119] The upper part of the fourth chamber (354) is vertically connected to the lower part of the second communication chamber (152).

[0120] The second communication chamber (152) is provided between the lower part of the second chamber (352) and the upper part of the fourth chamber (354) inside the fixture (100).

[0121] The second communication chamber (152) vertically connects the second chamber (352) and the fourth chamber (354).

[0122] The second communication chamber (152), like the fourth chamber (354), is positioned to the right of the center point of the fixed body (100) and has a ring-shaped cross-section with a curvature so as to have a smaller area than a semicircular ring.

[0123] The second communication chamber (152) has the same shape as the fourth chamber (354).

[0124] A second bulkhead (132) is provided between the second communication chamber (152) and the fourth chamber (354) so ​​that the second communication chamber (152) does not communicate with the fourth chamber (354).

[0125] The vertical length of the first communication chamber (151) is formed to be longer than the vertical length of the second communication chamber (152).

[0126] The horizontal length from the center point of the fixture (100) to the first communication chamber (151) is the same as the horizontal length from the center point of the fixture (100) to the second communication chamber (152).

[0127] The horizontal length from the center point of the fixture (100) to the third chamber (353) is the same as the horizontal length from the center point of the fixture (100) to the fourth chamber (354).

[0128] Coating layer (20)

[0129] Below, the coating layer (20) is described.

[0130] As shown in FIGS. 8, 10, 12 and 13, a coating layer (20) may be provided on the outer surface of a fixture (100) made of aluminum material.

[0131] The coating layer (20) may be provided on the outer surface of the upper fixture (100a) that comes into contact with the first sealing portion (400), the second sealing portion (500), and the third sealing portion (600) of the upper fixture (100a).

[0132] In more detail, the coating layer (20) may be provided on the outer surface of the first protrusion (111) that comes into contact with the first sealing portion (400) in the upper fixture (100a), the outer surface of the first protrusion (112) that comes into contact with the second sealing portion (500) in the upper fixture (100a), and the outer surface of the third protrusion (113) that comes into contact with the third sealing portion (600) in the upper fixture (100a).

[0133] The coating layer (20) can be formed by coating the surface of the outer surface of the upper fixture (100a), i.e., the fixture (100) made of aluminum, with an amorphous powder.

[0134] Amorphous powder can be made of powder of a material with high hardness, such as iron (Fe), molybdenum (Mo), or chromium (Cr).

[0135] It is preferable that the coating layer (20) have a high hardness characteristic of having a surface hardness of HRC 60 or higher.

[0136] As shown in Fig. 15, the coating layer (20) can be provided inside a coating groove (30) formed on the surface of the fixed body (100) made of aluminum material.

[0137] The process of forming a coating layer (20) inside the coaching home (30) is as follows.

[0138] First, a coating groove (30) is formed physically or chemically on the surface of the outer surface of the fixture (100) (or upper fixture (100a)).

[0139] After this, amorphous powder is applied to the inside of the coating groove (30) to form a coating layer (20). The coating layer (20) thus formed protrudes outward from the surface of the fixture (100) (or upper fixture (100a)).

[0140] After this, the coating layer (20) protruding outward from the surface of the fixture (100) (or the upper fixture (100a)) is polished to the surface height of the fixture (100) (or the upper fixture (100a)). The thickness of the polished coating layer (20) can be formed to be the same as the depth of the coating groove (30). Therefore, both the area where the coating layer (20) is not formed and the area where the coating layer (20) is formed can be made flat.

[0141] As above, by forming the coating layer (20) inside the coating groove (30), the coating layer (20) is firmly formed inside the coating groove (30), so that the coating layer (20) can be prevented from falling off.

[0142] As described above, since a coating layer (20) having high hardness is formed and provided on the outer surface of the fixture (100) (or upper fixture (100a)) that comes into contact with the first sealing portion (400), the second sealing portion (500), and the third sealing portion (600), the wear resistance of the outer surface of the fixture (100) (or upper fixture (100a)) can be improved depending on the use of the rotary joint (10).

[0143] For example, when a rotary joint (10) is used in a radar system, if a coating layer (20) is provided on the outer surface of the fixture (100) (or the upper fixture (100a)), wear of the portion in contact with the first to third sealing parts (400, 500, 600) is prevented, thereby increasing the operating time of the radar, thereby increasing the efficiency of the radar system.

[0144] 1st sealing part (400)

[0145] Below, the first sealing portion (400) will be described.

[0146] As shown in FIGS. 3, 4, 8 and 9, the first sealing portion (400) is inserted and provided between the fixed body (100) and the rotating body (200), i.e., in the first sealing portion installation space (371).

[0147] The first sealing portion (400) is located at the upper portion of the first chamber (351).

[0148] The first sealing part installation space (371) is formed by the space between the inner surface of the upper part of the rotating body (200) and the outer side of the first protrusion (111) of the upper fixed body (100a).

[0149] The first sealing part installation space (371) is located at the lower part of the first bearing part (310) and the upper part of the first chamber (351).

[0150] The first sealing part (400) is inserted and placed in the first sealing part installation space (371).

[0151] The inner side of the rotating body (200) is provided with a support protrusion (230) that protrudes inward.

[0152] The support protrusion (230) is located at a position corresponding to the lower part of the first sealing portion installation space (371).

[0153] The first sealing portion (400) is interposed between the lower portion of the first bearing portion (310) and the upper portion of the supporting protrusion (230) and is coupled to the rotating body (200). In this case, the lower portion of the first sealing portion (400), i.e., the lower surface of the first-first spacer (481), is supported by contacting the upper surface of the supporting protrusion (230).

[0154] The first sealing part (400) includes a first-first sealing member (410) having a first-first O-ring (411) on the outside, a first-second sealing member (420) having a first-second O-ring (422) on the outside and arranged under the first-first sealing member (410), a first-third sealing member (430) having a first-third O-ring (432) on the outside and arranged under the first-second sealing member (420), a first-first bending prevention ring (440) interposed between the first-first sealing member (410) and the first-second sealing member (420), and a first-second bending prevention ring (450) interposed between the first-second sealing member (420) and the first-third sealing member (430). A first-third bending prevention ring (460) arranged on the upper part of the first-first sealing member (410), a first-first spacer (481) arranged on the lower part of the first-third sealing member (430), first-first to first-third spring grooves (413, 423, 433) having a shape sunken upward from the lower surface of each of the first-first to first-third sealing members (410, 420, 430), first-first to first-third ribs (414, 424, 434) having a shape protruding downward from the lower part of each of the first-first to first-third sealing members (410, 420, 430) and located on the inner side of each of the first-first to first-third spring grooves (413, 423, 433), and first-first to first-third It may be configured to include first-first to first-third springs (415, 425, 435) inserted into each of the first-third spring grooves (413, 423, 433) and pressurizing each of the first-first to first-third ribs (414, 424, 434) inward, a first-first drain groove (441) provided on one side of the first-first bending prevention ring (440), a first-second drain groove (451) provided on one side of the first-second bending prevention ring (450), and a first-third drain groove (461) provided on one side of the first-third bending prevention ring (460).

[0155] The first-first sealing member (410) is located at the upper part of the first-first bending prevention ring (440) and the lower part of the first-third bending prevention ring (460). That is, the first-first sealing member (410) is interposed between the upper part of the first-first bending prevention ring (440) and the lower part of the first-third bending prevention ring (460).

[0156] A 1-1 O-ring (411) is provided on the outside of the 1-1 sealing member (410).

[0157] The 1-1 O-ring (411) is inserted into the 1-1 O-ring groove (411) which is provided to be open in an outward direction on the outside of the 1-1 sealing member (410).

[0158] The outer surface of the 1-1 O-ring (411) contacts the inner surface of the rotating body (200).

[0159] The 1-1 O-ring (411) has a ring shape.

[0160] The 1-1 O-ring (411) can be made of a material with high flexibility and high sealing properties, such as rubber or silicone.

[0161] A 1-1 spring groove (413) is provided on the inner side of the 1-1 sealing member (410).

[0162] The first-first spring groove (413) has a shape that is sunken upward from the lower surface of the first-first sealing member (410). Therefore, the first-first spring groove (413) is opened downward.

[0163] A first-first rib (414) is provided on the inner side of the first-first spring home (413).

[0164] The 1-1 rib (414) is cut by the 1-1 spring groove (413) and has a shape that protrudes downward from the 1-1 sealing member (410).

[0165] The inner surface of the first rib (414) contacts the outer surface of the fixed body (100), i.e., the upper fixed body (100a).

[0166] The 1-1 spring (415) is inserted into the 1-1 spring groove (413).

[0167] The first spring (415) has a ring spring shape in which circular rings with elasticity are connected in a ring shape.

[0168] As the first-first spring (415) is inserted into the first-first spring groove (413), the elastic force of the first-first spring (415) causes the first-first rib (414) to press inward. Accordingly, contact between the inner surface of the first-first rib (414) and the outer surface of the upper fixture (100a) can be continuously maintained.

[0169] The first-second sealing member (420) is located at the lower portion of the first-first bending prevention ring (440) and the upper portion of the first-second bending prevention ring (450). That is, the first-second sealing member (420) is interposed between the lower portion of the first-first bending prevention ring (440) and the upper portion of the first-second bending prevention ring (450).

[0170] A first-second O-ring (422) is provided on the outside of the first-second sealing member (420).

[0171] The first-second O-ring (422) is inserted into the first-second O-ring groove (421) which is provided to be open in an outward direction on the outside of the first-second sealing member (420).

[0172] The outer surface of the first-second O-ring (422) contacts the inner surface of the rotating body (200).

[0173] The 1st-2nd O-ring (422) has a ring shape.

[0174] The first and second O-rings (422) can be made of a material with high flexibility and high sealing properties, such as rubber or silicone.

[0175] A first-second spring groove (423) is provided on the inner side of the first-second sealing member (420).

[0176] The first-second spring groove (423) has a shape that is sunken upward from the lower surface of the first-second sealing member (420). Therefore, the first-second spring groove (423) is open downward.

[0177] A first-second rib (424) is provided on the inner side of the first-second spring home (423).

[0178] The first-second rib (424) is cut by the first-second spring groove (423) and has a shape that protrudes downward from the first-second sealing member (420).

[0179] The inner surface of the first-second rib (424) contacts the outer surface of the fixed body (100), i.e., the upper fixed body (100a).

[0180] The first-second spring (425) is inserted into the first-second spring groove (423).

[0181] The first and second springs (425) have a ring spring shape in which circular rings with elasticity are connected in a ring shape.

[0182] As the first-second spring (425) is inserted into the first-second spring groove (423), the elastic force of the first-second spring (425) causes the first-second rib (424) to press inward. Accordingly, contact between the inner surface of the first-second rib (424) and the outer surface of the upper fixture (100a) can be continuously maintained.

[0183] The first-third sealing member (430) is located at the lower portion of the first-second bending prevention ring (450) and the upper portion of the first-first spacer (481). That is, the first-third sealing member (430) is interposed between the lower portion of the first-second bending prevention ring (450) and the upper portion of the first-first spacer (481).

[0184] A 1-3 O-ring (432) is provided on the outside of the 1-3 sealing member (430).

[0185] The 1-3 O-ring (432) is inserted into the 1-3 O-ring groove (431) which is provided to be open in an outward direction on the outside of the 1-3 sealing member (430).

[0186] The outer surface of the 1st-3rd O-ring (432) contacts the inner surface of the rotating body (200).

[0187] The 1-3 O-ring (432) has a ring shape.

[0188] The 1-3 O-ring (432) can be made of a material with high flexibility and high sealing properties, such as rubber or silicone.

[0189] A 1-3 spring groove (433) is provided on the inner side of the 1-3 sealing member (430).

[0190] The first-third spring groove (433) has a shape that is sunken upward from the lower surface of the first-third sealing member (430). Therefore, the first-third spring groove (433) is open downward.

[0191] A first-third rib (434) is provided on the inner side of the first-third spring home (433).

[0192] The 1-3 rib (434) is cut by the 1-3 spring groove (433) and has a shape that protrudes downward from the 1-3 sealing member (430).

[0193] The inner surface of the 1st-3rd rib (434) contacts the outer surface of the fixed body (100), i.e., the upper fixed body (100a).

[0194] The 1st-3rd spring (435) is inserted into the 1st-3rd spring groove (433).

[0195] The 1st-3rd spring (435) has a ring spring shape in which circular rings with elasticity are connected in a ring shape.

[0196] As the first-third spring (435) is inserted into the first-third spring groove (433), the elastic force of the first-third spring (435) causes the first-third rib (434) to press inward. Accordingly, contact between the inner surface of the first-third rib (434) and the outer surface of the upper fixture (100a) can be continuously maintained.

[0197] It is preferable that there be a minus tolerance between the inner surface of the first to third sealing members (410, 420, 430) and the outer surface of the fixture (100), i.e., the upper fixture (100a). This is so that the inner surface of the first to third sealing members (410, 420, 430), i.e., the inner surface of each of the first to third ribs (414, 424, 434), always contacts the outer surface of the upper fixture (100a). Accordingly, the sealing of the rotating body (200) and the fixed body (100) is firmly achieved by the 1-1 to 1-3 sealing members (410, 420, 430), and through this, the fluid flowing in the first chamber (351) is prevented from leaking into the upper part of the first chamber (351), i.e., the first sealing member installation space (371).

[0198] The first to third sealing members (410, 420, 430) may be made of a composite material of polytetrafluoroethylene (PTFE) and glass fiber.

[0199] It is preferable that the 1-1 to 1-3 sealing members (410, 420, 430) have a high hardness characteristic of HRC 60 or higher.

[0200] As described above, a coating groove (30) is formed on the outer surface of the fixture (100) (or the upper fixture (100a)), i.e., the outer surface of the first protrusion (111), and as the coating layer (20) is formed in the coating groove (30), the hardness of the outer surface of the first protrusion (111) that comes into contact with the inner surfaces of the first-1 to first-3 ribs (414, 424, 434) can be improved. Accordingly, the wear resistance of the outer surface of the first protrusion (111) is improved, extending the life of the rotary joint (10), and the sealing of the first sealing portion (400) is firmly maintained, thereby preventing fluid leakage.

[0201] The first-first bending prevention ring (440) is interposed between the lower part of the first-first sealing member (410) and the upper part of the first-second sealing member (420) and has the function of preventing bending (i.e., bending) of the first-first sealing member (410) and the first-second sealing member (420).

[0202] The 1-3 bending prevention ring (460) is interposed between the upper part of the 1-1 sealing member (410) and the lower part of the first bearing part (310) and has the function of preventing bending (i.e., bending) of the 1-1 sealing member (410).

[0203] In detail, even if the pressure inside the first chamber (351) increases due to the fluid flowing inside the first chamber (351), the first-first bending prevention ring (440) is interposed between the first-first sealing member (410) and the first-second sealing member (420) and is in contact with the lower surface of the first-first sealing member (410) and the upper surface of the first-second sealing member (420) to support the first-first and first-second sealing members (410, 420), and the first-third bending prevention ring (460) is arranged on the upper surface of the first-first sealing member (410) and is in contact with the upper surface of the first-first sealing member (410) to support the first-first sealing member (410), so that the bending of the first-first sealing member (410) and the first-second sealing member (420) is prevented. Can be.

[0204] The first-second bending prevention ring (450) is interposed between the lower part of the first-second sealing member (420) and the upper part of the first-third sealing member (430) and has the function of preventing bending (i.e., bending) of the first-second sealing member (420) and the first-third sealing member (430).

[0205] In detail, even if the pressure inside the first chamber (351) increases due to the fluid flowing inside the first chamber (351), the first-second bending prevention ring (450) is interposed between the first-second sealing member (420) and the first-third sealing member (430) and comes into contact with the lower surface of the first-second sealing member (420) and the upper surface of the first-third sealing member (430) to support the first-second and first-third sealing members (420, 430), so that bending of the first-second sealing member (420) and the first-third sealing member (430) can be prevented.

[0206] The first to third bending prevention rings (440, 450, 460) have an overall ring shape.

[0207] The first to third bending prevention rings (440, 450, 460) have a cross-section in which the outer side of the upper surface is inclined downwardly as it goes outward.

[0208] The first to third bending prevention rings (440, 450, 460) may be made of a high-hardness steel material.

[0209] The 1-1 spacer (481) is interposed between the lower part of the 1-3 sealing member (430) and the upper part of the supporting protrusion (230).

[0210] The first spacer (481) may have a ring-shaped shape.

[0211] The first-first spacer (481) prevents the first-third sealing member (430) from directly contacting the support protrusion (230). Therefore, it functions to prevent the first-third sealing member (430) from being damaged by direct contact and pressure.

[0212] The 1-1 spacer (481) may be made of a high-hardness suspension material.

[0213] Each of the first to third drain grooves (441, 451, 461) is provided on one side of each of the first to third bending prevention rings (440, 450, 460). In the present invention, each of the first to third drain grooves (441, 451, 461) is provided on the left side of each of the first to third bending prevention rings (440, 450, 460).

[0214] The first to third drain grooves (441, 451, 461) are connected to the first drain hole (711) which is provided to penetrate from the inside of the rotating body (200) toward the outside of the rotating body (200).

[0215] The first to third spring grooves (413, 423, 433) are opened downwardly of the first sealing portion (400) where the first chamber (351) is located. Accordingly, the first to third springs (415, 425, 435) are exposed downwardly of the first sealing portion (400) where the first chamber (351) is located.

[0216] As above, the first to third spring grooves (413, 423, 433) are opened in the same direction, and the first to third springs (415, 425, 435) are exposed in the same direction.

[0217] The first to third ribs (414, 424, 434) protrude downward from the first sealing portion (400) where the first chamber (351) is located.

[0218] As above, the 1st to 1st to 3rd ribs (414, 424, 434) protrude in the same direction.

[0219] By the shape of the first sealing portion (400) as described above, even if the pressure of the fluid flowing in the first chamber (351) increases when the rotating body (200) rotates, the fluid can be prevented from leaking upward. It is preferable that the first sealing portion (400) have high sealing properties so that the sealing can be maintained even at a pressure of about 10 bar or more.

[0220] Second sealing section (500)

[0221] Below, the second sealing portion (500) will be described.

[0222] As shown in FIGS. 3, 4, 10 and 11, the second sealing portion (500) is inserted and provided between the fixed body (100) and the rotating body (200), i.e., in the second sealing portion installation space (372).

[0223] The second sealing portion (500) is located between the lower portion of the first chamber (351) and the upper portion of the second chamber (352).

[0224] The second sealing part installation space (372) is formed by the space between the inner surface of the center of the rotating body (200) and the outer surface of the second protrusion (112) of the upper fixed body (100a).

[0225] The second sealing part installation space (372) is located between the lower part of the first chamber (351) and the upper part of the second chamber (352).

[0226] A second sealing part (500) is inserted and placed in the second sealing part installation space (372).

[0227] The second sealing part (500) is coupled to the rotating body (200) by the second-1 holder (571) and the second-2 holder (572).

[0228] The second sealing part (500) includes a second-first sealing member (510) having a second-first O-ring (512) on the outside, a second-second sealing member (520) having a second-second O-ring (522) on the outside and arranged on the lower side of the second-first sealing member (510), a second-first bending prevention ring (540) interposed between the second-first sealing member (510) and the second-second sealing member (520), a second-first holder (571) arranged on the upper side of the second-first sealing member (510) and coupled to the rotating body, a second-first spacer (581) interposed between the second-first holder (571) and the second-first sealing member (510), and arranged on the lower side of the second-second sealing member (520). A second-2 holder (572) coupled to the rotating body, a second-2 spacer (582) interposed between the second-2 holder (572) and the second-2 sealing member (520), a second-1 spring groove (513) having a shape sunken downward from the upper surface of the second-1 sealing member (510), a second-2 spring groove (523) having a shape sunken upward from the lower surface of the second-2 sealing member (520), a second-1 rib (514) having a shape protruding upward from the upper portion of the second-1 sealing member (510) and located on the inner side of the second-1 spring groove (513), and a second-2 spacer (582) having a shape protruding downward from the lower portion of the second-2 sealing member (520) and located on the inner side of the second-2 spring groove (523) It can be configured to include a second-2 rib (524) and a second-1, 2-2 spring (515, 525) inserted into each of the second-1, 2-2 spring grooves (513, 523) to press the second-1, 2-2 ribs (514, 524) inwardly, respectively.

[0229] The second-first sealing member (510) is located at the lower portion of the first-first spacer (481) and the upper portion of the second-first bending prevention ring (540). That is, the second-first sealing member (510) is interposed between the lower portion of the first-first spacer (481) and the upper portion of the second-first bending prevention ring (540).

[0230] A 2-1 O-ring (512) is provided on the outside of the 2-1 sealing member (510).

[0231] The 2-1 O-ring (512) is inserted into the 2-1 O-ring groove (511) which is provided to be open in an outward direction on the outside of the 2-1 sealing member (510).

[0232] The outer surface of the 2-1 O-ring (512) contacts the inner surface of the rotating body (200).

[0233] The 2-1 O-ring (512) has a ring shape.

[0234] The 2-1 O-ring (512) can be made of a material with high flexibility and high sealing properties, such as rubber or silicone.

[0235] A 2-1 spring groove (513) is provided on the inner side of the 2-1 sealing member (510).

[0236] The 2-1 spring groove (513) has a shape that is sunken downward from the upper surface of the 1-1 sealing member (410). Therefore, the 2-1 spring groove (513) is open upward.

[0237] A second-1 rib (514) is provided on the inner side of the second-1 spring home (513).

[0238] The 2-1 rib (514) is cut by the 2-1 spring groove (513) and has a shape that protrudes upward from the 2-1 sealing member (510).

[0239] The inner surface of the 2nd-1 rib (514) contacts the outer surface of the fixed body (100), i.e., the upper fixed body (100a).

[0240] The 2-1 spring (515) is inserted into the 2-1 spring groove (513).

[0241] The 2nd-1 spring (515) has a ring spring shape in which circular rings with elasticity are connected in a ring shape.

[0242] As the second-1 spring (515) is inserted into the second-1 spring groove (513), the elastic force of the second-1 spring (515) causes the second-1 rib (514) to press inward. Accordingly, contact between the inner surface of the second-1 rib (514) and the outer surface of the upper fixture (100a) can be continuously maintained.

[0243] The second-2 sealing member (520) is located at the lower portion of the second-1 bending prevention ring (540) and the upper portion of the second-2 spacer (582). That is, the second-2 sealing member (520) is interposed between the lower portion of the second-1 bending prevention ring (540) and the upper portion of the second-2 spacer (582).

[0244] A second-second O-ring (522) is provided on the outside of the second-second sealing member (520).

[0245] The second-2 O-ring (522) is inserted into the second-2 O-ring groove (521) which is provided to be open in an outward direction on the outside of the second-2 sealing member (520).

[0246] The outer surface of the 2nd O-ring (522) contacts the inner surface of the rotor (200).

[0247] The 2-2 O-ring (522) has a ring shape.

[0248] The second-second O-ring (522) can be made of a material with high flexibility and high sealing properties, such as rubber or silicone.

[0249] A second-second spring groove (523) is provided on the inner side of the second-second sealing member (520).

[0250] The second-second spring groove (523) has a shape that is sunken upward from the lower surface of the second-second sealing member (520). Therefore, the second-second spring groove (523) is open downward.

[0251] A second-second rib (524) is provided on the inner side of the second-second spring home (523).

[0252] The 2nd-2 rib (524) is cut by the 2nd-2 spring groove (523) and has a shape that protrudes downward from the 2nd-2 sealing member (520).

[0253] The inner surface of the second-second rib (524) contacts the outer surface of the fixed body (100), i.e., the upper fixed body (100a).

[0254] The second-second spring (525) is inserted into the second-second spring groove (523).

[0255] The 2nd-2 spring (525) has a ring spring shape in which circular rings with elasticity are connected in a ring shape.

[0256] As the second-2 spring (525) is inserted into the second-2 spring groove (523), the elastic force of the second-2 spring (525) causes the second-2 rib (524) to press inward. Accordingly, contact between the inner surface of the second-2 rib (524) and the outer surface of the upper fixture (100a) can be continuously maintained.

[0257] It is preferable that there be a minus tolerance between the inner surface of the 2-1, 2-2 sealing members (510, 520) and the outer surface of the fixture (100), i.e., the upper fixture (100a). This is so that the inner surface of the 2-1, 2-2 sealing members (510, 520), i.e., the inner surface of each of the 2-1, 2-2 ribs (514, 524), always contacts the outer surface of the upper fixture (100a). Accordingly, the sealing of the rotating body (200) and the fixed body (100) is firmly achieved by the 2-1 and 2-2 sealing members (510, 520), and through this, the fluid flowing in the first chamber (351) and the second chamber (352) is prevented from leaking into the lower part of the first chamber (351) and the upper part of the second chamber (352), i.e., the second sealing member installation space (372).

[0258] The 2-1 and 2-2 sealing members (510, 520) may be made of a composite material of polytetrafluoroethylene (PTFE) and glass fiber.

[0259] It is desirable that the 2-1 and 2-2 sealing members (510, 520) have high hardness characteristics of HRC 60 or higher.

[0260] As described above, a coating groove (30) is formed on the outer surface of the fixture (100) (or the upper fixture (100a)), i.e., the outer surface of the second protrusion (112), and as the coating layer (20) is formed in the coating groove (30), the hardness of the outer surface of the second protrusion (112) that comes into contact with the inner surfaces of the 2-1, 2-2 ribs (514, 524) can be improved. Accordingly, the wear resistance of the outer surface of the second protrusion (112) is improved, extending the life of the rotary joint (10), and the sealing of the second sealing portion (500) is maintained firmly, thereby preventing fluid leakage.

[0261] The 2-1 bending prevention ring (540) is interposed between the lower part of the 2-1 sealing member (510) and the upper part of the 2-2 sealing member (520) and has the function of preventing bending (i.e., bending) of the 2-1 sealing member (510) and the 2-2 sealing member (520).

[0262] In detail, even if the pressure inside the first chamber (351) and the second chamber (352) increases due to the fluid flowing inside the first chamber (351) and the second chamber (352), the 2-1 bending prevention ring (540) is interposed between the 2-1 sealing member (510) and the 2-2 sealing member (520) and comes into contact with the lower surface of the 2-1 sealing member (510) and the upper surface of the 2-2 sealing member (520) to support the 2-1 and 2-2 sealing members (510, 520), so that bending of the 2-1 sealing member (510) and the 2-2 sealing member (520) can be prevented.

[0263] The second-first bending prevention ring (540) has an overall ring shape.

[0264] The 2-1 bending prevention ring (540) has a cross-section that is inclined downwardly as the outer side of the upper surface goes outward.

[0265] The second-first bending prevention ring (540) may be made of a high-hardness steel material.

[0266] The 2-1 holder (571) is placed on the upper part of the 2-1 spacer (581).

[0267] The inner side of the rotating body (200) is provided with a 2-1 holder groove (not shown in the drawing) that is sunken in the outward direction.

[0268] The 2-1 holder home is located at a position corresponding to the upper portion of the 2nd sealing part installation space (372).

[0269] The outer side of the 2-1 holder (571) is inserted into the 2-1 holder groove, and the 2-1 holder (571) and the rotating body (200) are combined.

[0270] The 2nd-2 holder (572) is placed at the bottom of the 2nd-2 spacer (582).

[0271] The inner side of the rotating body (200) is provided with a second-second holder groove (not shown in the drawing) that is sunken in the outward direction.

[0272] The 2-2 holder home is provided at the bottom of the 2-1 holder home.

[0273] The 2nd-2 holder home is located at a position corresponding to the lower part of the 2nd sealing part installation space (372).

[0274] The outer side of the 2nd-2 holder (572) is inserted into the 2nd-2 holder groove, and the 2nd-2 holder (572) and the rotating body (200) are combined.

[0275] The 2-1, 2-2 holders (571, 572) are each inserted into the 2-1, 2-2 holder grooves, respectively, so that the 2-1, 2-2 holders (571, 572) are fixedly connected to the rotating body, and the 2-1, 2-2 sealing members (510, 520), the 2-1 bending prevention ring (540), and the 2-1, 2-2 spacers (581, 582) are interposed between the 2-1, 2-2 holders (571, 572), so that the 2nd sealing member (500) is fixedly connected to the rotating body by being pressed up and down by the 2-1, 2-2 holders (571, 572).

[0276] The 2-1, 2-2 holders (571, 572) may have a ring-shaped plate spring shape. Accordingly, the 2-1, 2-2 holders (571, 572) have elasticity in the vertical direction. Accordingly, even if the 2-1, 2-2 holders (571, 572) press the second sealing portion (500) vertically, the 2-1 sealing member (510) and the 2-2 sealing member (520) can be prevented from being damaged by the elasticity of the 2-1, 2-2 holders (571, 572).

[0277] The 2-1 and 2-2 holders (571, 572) can be made of a high-hardness steel material.

[0278] The 2-1 spacer (581) is interposed between the lower part of the 2-1 holder (571) and the upper part of the 2-1 sealing member (510).

[0279] The 2-1 spacer (581) prevents the 2-1 sealing member (510) and the 2-1 holder (571) from making direct contact, thereby preventing the 2-1 sealing member (510) from being damaged by the pressing force of the 2-1 holder (571).

[0280] The 2nd-2 spacer (582) is interposed between the upper part of the 2nd-2 holder (572) and the lower part of the 2nd-2 sealing member (520).

[0281] The 2-2 spacer (582) prevents the 2-2 sealing member (520) and the 2-2 holder (572) from making direct contact, thereby preventing the 2-2 sealing member (520) from being damaged by the pressing force of the 2-2 holder (572).

[0282] The 2-1 spacer (581) and the 2-2 spacer (582) may be made of a high-hardness steel material.

[0283] The second-first spring home (513) is opened in the upper direction of the second sealing portion (500) where the first chamber (351) is located. Accordingly, the second-first spring (515) is exposed in the upper direction of the second sealing portion (500) where the first chamber (351) is located.

[0284] The second-second spring home (523) is opened toward the lower side of the second sealing portion (500) where the second chamber (352) is located. Accordingly, the second-second spring (525) is exposed toward the lower side of the second sealing portion (500) where the second chamber (352) is located.

[0285] As above, the 2-1 spring home (513) and the 2-2 spring home (523) are opened in different directions, and the 2-1 spring (515) and the 2-2 spring (525) are exposed in different directions.

[0286] The second-first rib (514) protrudes upward from the second sealing portion (500) where the first chamber (351) is located, and the second-second rib (524) protrudes downward from the second sealing portion (500) where the second chamber (352) is located.

[0287] As above, the 2nd-1 rib (514) and the 2nd-2 rib (524) protrude in different directions.

[0288] By the shape of the second sealing portion (500) as described above, even if the pressure of the fluid flowing through the first chamber (351) and the second chamber (352) increases when the rotating body (200) rotates, the fluid can be prevented from leaking in the upward or downward direction. It is preferable that the second sealing portion (500) have high sealing properties so that the sealing can be maintained even at a pressure of about 10 bar or more.

[0289] Third sealing section (600)

[0290] Below, the third sealing part (600) will be described.

[0291] As shown in FIGS. 3, 4, 12 to 14, the third sealing part (600) is inserted and provided between the fixed body (100) and the rotating body (200), i.e., in the third sealing part installation space (373).

[0292] The third sealing part (600) is located at the bottom of the second chamber (352).

[0293] The third sealing part installation space (373) is formed by the space between the inner surface of the lower part of the rotating body (200) and the outer side of the third protrusion (113) of the upper fixed body (100a).

[0294] The third sealing part installation space (373) is located at the upper part of the second bearing part (320) and the lower part of the second chamber (352).

[0295] The first sealing part (400) is inserted and placed in the third sealing part installation space (373).

[0296] The third sealing part (600) is coupled to the rotating body (200) by the third-1 holder (671) and the third-2 holder (672).

[0297] The third sealing part (600) includes a third-first sealing member (610) having a third-first O-ring (612) on the outside, a third-second sealing member (320) having a third-second O-ring (622) on the outside and arranged under the third-first sealing member (610), a third-third sealing member (330) having a third-third O-ring (632) on the outside and arranged under the third-second sealing member (320), a third-first bending prevention ring (640) interposed between the third-first sealing member (610) and the third-second sealing member (320), and a third-second bending prevention ring (650) interposed between the third-second sealing member (320) and the third-third sealing member (330). A 3-1 holder (671) arranged on the upper side of the 3-1 sealing member (610) and coupled to a rotating body, a 3-1 spacer (681) interposed between the 3-1 holder (671) and the 3-1 sealing member (610), a 3-2 holder (672) arranged on the lower side of the 3-3 sealing member (330) and coupled to a rotating body, a 3-2 spacer (682) interposed between the 3-2 holder (672) and the 3-3 sealing member (330), a 3-1 spring groove (613) having a shape sunken downward from the upper surface of the 3-1 sealing member (610), and a 3-2 spring groove (623) having a shape sunken downward from the upper surface of the 3-2 sealing member (320). A 3-3 spring groove (633) having a shape sunken downward from the upper surface of the 3-3 sealing member (330), a 3-1 rib (614) having a shape protruding upward from the upper portion of the 3-1 sealing member (610) and located on the inner side of the 3-1 spring groove (613), a 3-2 rib (624) having a shape protruding upward from the upper portion of the 3-2 sealing member (320) and located on the inner side of the 3-2 spring groove (623), a 3-3 rib (634) having a shape protruding upward from the upper portion of the 3-3 sealing member (330) and located on the inner side of the 3-3 spring groove (633), and inserted into each of the 3-1 to 3-3 spring grooves (613, 623, 633) to form the 3-1 Inland 3-3 rib (614, 624,634) It may be configured to include the 3-1 to 3-3 springs (615, 625, 635) that press inwardly, the 3-1 drain groove (641) provided on one side of the 3-1 bending prevention ring (640), and the 3-2 drain groove (651) provided on one side of the 3-2 bending prevention ring (650).

[0298] The 3-1 sealing member (610) is located at the lower portion of the 3-1 spacer (681) and the upper portion of the 3-1 bending prevention ring (640). That is, the 3-1 sealing member (610) is interposed between the lower portion of the 3-1 spacer (681) and the upper portion of the 3-1 bending prevention ring (640).

[0299] A 3-1 O-ring (612) is provided on the outside of the 3-1 sealing member (610).

[0300] The 3-1 O-ring (612) is inserted into the 3-1 O-ring groove (611) which is provided to be open in an outward direction on the outside of the 3-1 sealing member (610).

[0301] The outer surface of the 3-1 O-ring (612) contacts the inner surface of the rotating body (200).

[0302] The 3-1 O-ring (612) has a ring shape.

[0303] The 3-1 O-ring (612) can be made of a material with high flexibility and high sealing properties, such as rubber or silicone.

[0304] A 3-1 spring groove (613) is provided on the inner side of the 3-1 sealing member (610).

[0305] The 3-1 spring groove (613) has a shape that is sunken downward from the upper surface of the 3-1 sealing member (610). Therefore, the 3-1 spring groove (613) is open upward.

[0306] A 3-1 rib (614) is provided on the inside of the 3-1 spring home (613).

[0307] The 3-1 rib (614) is cut by the 3-1 spring groove (613) and has a shape that protrudes in the upper direction of the 3-3 sealing member (330).

[0308] The inner surface of the 3-1 rib (614) contacts the outer surface of the fixed body (100), i.e., the upper fixed body (100a).

[0309] The 3-1 spring (615) is inserted into the 3-1 spring groove (613).

[0310] The 3-1 spring (615) has a ring spring shape in which circular rings with elasticity are connected in a ring shape.

[0311] As the 3-1 spring (615) is inserted into the 3-1 spring groove (613), the elastic force of the 3-1 spring (615) causes the 3-1 rib (614) to press inward. Accordingly, contact between the inner surface of the 3-1 rib (614) and the outer surface of the upper fixture (100a) can be continuously maintained.

[0312] The 3-2 sealing member (320) is located at the lower portion of the 3-1 bending prevention ring (640) and the upper portion of the 3-2 bending prevention ring (650). That is, the 3-2 sealing member (320) is interposed between the lower portion of the 3-1 bending prevention ring (640) and the upper portion of the 3-2 bending prevention ring (650).

[0313] A 3-2 O-ring (622) is provided on the outside of the 3-2 sealing member (320).

[0314] The 3-2 O-ring (622) is inserted into the 3-2 O-ring groove (621) which is provided to be open in an outward direction on the outside of the 3-2 sealing member (320).

[0315] The outer surface of the 3-2 O-ring (622) contacts the inner surface of the rotor (200).

[0316] The 3-2 O-ring (622) has a ring shape.

[0317] The 3-2 O-ring (622) can be made of a material with high flexibility and high sealing properties, such as rubber or silicone.

[0318] A 3-2 spring groove (623) is provided on the inner side of the 3-2 sealing member (320).

[0319] The 3-2 spring groove (623) has a shape that is sunken downward from the upper surface of the 3-2 sealing member (320). Therefore, the 3-2 spring groove (623) is open upward.

[0320] A third-second rib (624) is provided on the inner side of the third-second spring home (623).

[0321] The 3-2 rib (624) is cut by the 3-2 spring groove (623) and has a shape that protrudes in the upper direction of the 3-3 sealing member (330).

[0322] The inner surface of the 3rd-2nd rib (624) contacts the outer surface of the fixed body (100), i.e., the upper fixed body (100a).

[0323] The 3-2 spring (625) is inserted into the 3-2 spring groove (623).

[0324] The 3-2 spring (625) has a ring spring shape in which circular rings with elasticity are connected in a ring shape.

[0325] As the third-second spring (625) is inserted into the third-second spring groove (623), the elastic force of the third-second spring (625) causes the third-second rib (624) to press inward. Accordingly, contact between the inner surface of the third-second rib (624) and the outer surface of the upper fixture (100a) can be continuously maintained.

[0326] The third-third sealing member (330) is located at the lower part of the third-second bending prevention ring (650) and the upper part of the third-second spacer (682). That is, the third-third sealing member (330) is interposed between the lower part of the third-second bending prevention ring (650) and the upper part of the third-second spacer (682).

[0327] A 3-3 O-ring (632) is provided on the outside of the 3-3 sealing member (330).

[0328] The third-third O-ring (632) is inserted into the third-third O-ring groove (631) which is provided to be open in an outward direction on the outside of the third-third sealing member (330).

[0329] The outer surface of the 3-3 O-ring (632) contacts the inner surface of the rotor (200).

[0330] The 3-3 O-ring (632) has a ring shape.

[0331] The 3-3 O-ring (632) can be made of a material with high flexibility and high sealing properties, such as rubber or silicone.

[0332] A 3-3 spring groove (633) is provided on the inner side of the 3-3 sealing member (330).

[0333] The third-third spring groove (633) has a shape that is sunken downward from the upper surface of the third-third sealing member (330). Therefore, the third-third spring groove (633) is open upward.

[0334] A third-third rib (634) is provided on the inside of the third-third spring home (633).

[0335] The 3-3 rib (634) is cut by the 3-3 spring groove (633) and has a shape that protrudes in the upper direction of the 3-3 sealing member (330).

[0336] The inner surface of the 3rd-3rd rib (634) contacts the outer surface of the fixed body (100), i.e., the upper fixed body (100a).

[0337] The 3-3 spring (635) is inserted into the 3-3 spring groove (633).

[0338] The 3-3 spring (635) has a ring spring shape in which circular rings with elasticity are connected in a ring shape.

[0339] As the third-third spring (635) is inserted into the third-third spring groove (633), the elastic force of the third-third spring (635) causes the third-third rib (634) to press inward. Accordingly, contact between the inner surface of the third-third rib (634) and the outer surface of the upper fixture (100a) can be continuously maintained.

[0340] It is preferable that there be a minus tolerance between the inner surface of the 3-1 to 3-3 sealing members (610, 620, 630) and the outer surface of the fixture (100), i.e., the upper fixture (100a). This is so that the inner surface of the 3-1 to 3-3 sealing members (610, 620, 630), i.e., the inner surface of each of the 3-1 to 3-3 ribs (614, 624, 634), always contacts the outer surface of the upper fixture (100a). Accordingly, the sealing of the rotating body (200) and the fixed body (100) is firmly achieved by the 3-1 to 3-3 sealing members (610, 620, 630), and through this, the fluid flowing in the second chamber (352) is prevented from leaking into the lower part of the second chamber (352), i.e., the third sealing member installation space (373).

[0341] The 3-1 to 3-3 sealing members (610, 620, 630) may be made of a composite material of polytetrafluoroethylene (PTFE) and glass fiber.

[0342] It is preferable that the 3-1 to 3-3 sealing members (610, 620, 630) have a high hardness characteristic of HRC 60 or higher.

[0343] As described above, a coating groove (30) is formed on the outer surface of the fixture (100) (or the upper fixture (100a)), i.e., the outer surface of the third protrusion (113), and as the coating layer (20) is formed in the coating groove (30), the hardness of the outer surface of the third protrusion (113) that comes into contact with the inner surfaces of the third-1 to third-3 ribs (614, 624, 634) can be improved. Accordingly, the wear resistance of the outer surface of the third protrusion (113) is improved, extending the life of the rotary joint (10), and the sealing of the third sealing portion (600) is firmly maintained, thereby preventing fluid leakage.

[0344] The 3-1 bending prevention ring (640) is interposed between the lower part of the 3-1 sealing member (610) and the upper part of the 3-2 sealing member (320) and has the function of preventing bending (i.e., bending) of the 3-1 sealing member (610) and the 3-2 sealing member (320).

[0345] In detail, even if the pressure inside the second chamber (352) increases due to the fluid flowing inside the second chamber (352), the 3-1 bending prevention ring (640) is interposed between the 3-1 sealing member (610) and the 3-2 sealing member (320) and comes into contact with the lower surface of the 3-1 sealing member (610) and the upper surface of the 3-2 sealing member (320) to support the 3-1 and 3-2 sealing members (610, 620), so that bending of the 3-1 sealing member (610) and the 3-2 sealing member (320) can be prevented.

[0346] The third-second bending prevention ring (650) is interposed between the lower part of the third-second sealing member (320) and the upper part of the third-third sealing member (330) and has the function of preventing bending (i.e., bending) of the third-second sealing member (320) and the third-third sealing member (330).

[0347] In detail, even if the pressure inside the second chamber (352) increases due to the fluid flowing inside the second chamber (352), the third-second bending prevention ring (650) is interposed between the third-second sealing member (320) and the third-third sealing member (330) and comes into contact with the lower surface of the third-second sealing member (320) and the upper surface of the third-third sealing member (330) to support the third-second and third-third sealing members (620, 630), so that bending of the third-second sealing member (320) and the third-third sealing member (330) can be prevented.

[0348] The 3-1 and 3-2 bending prevention rings (640, 650) have an overall ring shape.

[0349] The 3-1, 3-2 bending prevention ring (640, 650) has a cross-section that is inclined downwardly as the outer side of the upper surface goes outward.

[0350] The 3-1 and 3-2 bending prevention rings (640, 650) may be made of a high-hardness steel material.

[0351] The 3-1 holder (671) is placed on the upper part of the 3-1 spacer (681).

[0352] The inner side of the rotating body (200) is provided with a 3-1 holder groove (not shown in the drawing) that is sunken in the outward direction.

[0353] The 3-1 holder home is located at a position corresponding to the upper part of the 3rd sealing part installation space (373).

[0354] The outer side of the 3-1 holder (671) is inserted into the 3-1 holder groove, and the 3-1 holder (671) and the rotating body (200) are combined.

[0355] The 3-2 holder (672) is placed at the bottom of the 3-2 spacer (682).

[0356] The inner side of the rotating body (200) is provided with a 3-2 holder groove (not shown in the drawing) that is sunken in the outward direction.

[0357] The 3-2 holder home is provided at the bottom of the 3-1 holder home.

[0358] The 3-2 holder home is located at a position corresponding to the lower part of the 2nd sealing part installation space (372).

[0359] The outer side of the 3-2 holder (672) is inserted into the 3-2 holder groove, and the 3-2 holder (672) and the rotating body (200) are combined.

[0360] The 3-1 and 3-2 holders (671, 672) are each inserted into the 3-1 and 3-2 holder grooves, respectively, so that the 3-1 and 3-2 holders (671, 672) are fixedly connected to the rotating body, and the 3-1 to 3-3 sealing members (610, 620, 630), the 3-1 and 3-2 bending prevention rings (640, 650), and the 3-1 and 3-2 spacers (681, 682) are interposed between the 3-1 and 3-2 holders (671, 672), so that the 3rd sealing member (600) is fixedly connected to the rotating body by being pressed up and down by the 3-1 and 3-2 holders (671, 672).

[0361] The 3-1 and 3-2 holders (671 and 672) may have a ring-shaped plate spring shape. Accordingly, the 3-1 and 3-2 holders (671 and 672) have elasticity in the vertical direction. Accordingly, even if the 3-1 and 3-2 holders (671 and 672) press the 3rd sealing member (600) vertically, the 3-1 sealing member (610) and the 3-3 sealing member (330) can be prevented from being damaged by the elasticity of the 3-1 and 3-2 holders (671 and 672).

[0362] The 3-1 and 3-2 holders (671, 672) can be made of a high-hardness steel material.

[0363] The 3-1 spacer (681) is interposed between the lower part of the 3-1 holder (671) and the upper part of the 3-1 sealing member (610).

[0364] The 3-1 spacer (681) prevents the 3-1 sealing member (610) and the 3-1 holder (671) from making direct contact, thereby preventing the 3-1 sealing member (610) from being damaged by the pressing force of the 3-1 holder (671).

[0365] The 3-2 spacer (682) is interposed between the upper part of the 3-2 holder (672) and the lower part of the 3-3 sealing member (330).

[0366] The 3-2 spacer (682) prevents the 3-3 sealing member (330) and the 3-2 holder (672) from making direct contact, thereby preventing the 3-3 sealing member (630) from being damaged by the pressing force of the 3-2 holder (672).

[0367] The 3-1 spacer (681) and the 3-2 spacer (682) may be made of a high-hardness suspension material.

[0368] The third-first drain groove (641) and the third-second drain groove (651) are each provided on one side of the third-first bending prevention ring (640) and the third-second bending prevention ring, respectively. In the present invention, the third-first drain groove (641) and the third-second drain groove (651) are each provided on the left side of the third-first bending prevention ring (640) and the third-second bending prevention ring, respectively.

[0369] The 3-1 drain groove (641) and the 3-2 drain groove (651) are connected to the 2nd drain hole (712) which is provided to penetrate from the inside of the rotating body (200) toward the outside of the rotating body (200).

[0370] The third-1 to third-3 spring grooves (613, 623, 633) are opened in the upper direction of the third sealing portion (600) where the second chamber (352) is located. Accordingly, the third-1 to third-3 springs (615, 625, 635) are exposed in the upper direction of the third sealing portion (600) where the second chamber (352) is located.

[0371] As above, the 3-1 to 3-3 spring grooves (613, 623, 633) are opened in the same direction, and the 3-1 to 3-3 springs (615, 625, 635) are exposed in the same direction.

[0372] The 3rd-1 to 3rd-3rd ribs (614, 624, 634) protrude upward from the 3rd sealing portion (600) where the 2nd chamber (352) is located.

[0373] As above, the 3-1 to 3-3 ribs (614, 624, 634) protrude in the same direction.

[0374] By the shape of the third sealing portion (600) as described above, even if the pressure of the fluid flowing in the second chamber (352) increases when the rotating body (200) rotates, the fluid can be prevented from leaking upward. It is preferable that the third sealing portion (600) have high sealing properties so that the sealing can be maintained even at a pressure of about 10 bar or more.

[0375] Fluid drain section

[0376] The rotary joint (10) of the present invention can be constructed including a fluid drain portion, as shown in FIGS. 1, 4 to 6, 8, 12, and 13, and the fluid drain portion can be configured including first to third drain holes (711, 712, 713) and first and second drain paths (731, 732).

[0377] The first drain hole (711) is provided on the inside of the rotating body (200) so as to be in communication with one side of the first sealing part installation space (371). More specifically, the first drain hole (711) is provided on the inside of the left side of the rotating body (200) at a position corresponding to the first sealing part installation space (371) so as to be in communication with the outside of the first sealing part installation space (371).

[0378] The second drain hole (712) is provided on the inside of the rotating body (200) so as to be in communication with one side of the second sealing part installation space (372). More specifically, the second drain hole (712) is provided on the inside of the left side of the rotating body (200) at a position corresponding to the third sealing part installation space (373) so as to be in communication with the outside of the third sealing part installation space (373).

[0379] The first drain euro (731) connects the first drain hole (711) and the second drain hole (712).

[0380] The first drain euro (731) is provided on the left side of the rotating body (200).

[0381] The first drain euro (731) is protected by a pipe and exposed to the outside.

[0382] The third drain hole (713) is provided on the outside of the fixture (100) so as to be in communication with the third sealing part installation space (373). More specifically, the third drain hole (713) is provided on the front outside of the fixture (100) at a position corresponding to the third sealing part installation space (373) so as to be in communication with the third sealing part installation space (373).

[0383] The third drain hole (713) is formed to penetrate from the outside to the inside of the fixture (100) and extend to penetrate from the top to the bottom.

[0384] The second drain euro (732) is connected to the third drain hole (713) on one side.

[0385] The second drain urea (732) is provided in front of the fixture (100), i.e., the lower fixture (100b).

[0386] The second drain euro (732) is protected by a pipe and exposed to the outside.

[0387] The second drain euro (732) is connected to an external fluid recovery unit (not shown) on the other side, so that the third drain hole (713) can be connected to the external fluid recovery unit.

[0388] The first to third drain grooves (441, 451, 461) are connected to the first drain hole (711).

[0389] The 3-1 and 3-2 drain grooves (641, 651) are connected to the 2nd and 3rd drain holes (712, 713).

[0390] The fluid leaked from the first chamber (351) to the first sealing portion installation space (371) flows through the first-1 to first-3 drain grooves (441, 451, 461) to the first drain hole (711), the first drain path (731), and the second drain hole (712). Thereafter, the leaked fluid flows to the external fluid recovery unit through the third drain hole (713) and the second drain path (732), so that the leaked fluid can be recovered.

[0391] The fluid leaked from the second chamber (352) to the third sealing portion installation space (373) flows through the third-1, 3-2 drain grooves (641, 651) to the second drain hole (712), the third drain hole (713), and the second drain path (732) to the external fluid recovery unit, so that the leaked fluid can be recovered.

[0392] As described above, since the fluid drain section is provided, the fluid leaked into the first sealing section installation space (371) and the third sealing section installation space (373) can be easily recovered to the external fluid recovery section, thereby preventing the fluid from leaking into the hollow (105) and other locations.

[0393] First slope (111a) and second slope (112a)

[0394] The rotary joint (10) of the present invention may be configured to further include a first inclined portion (111a) and a second inclined portion (112a), as shown in FIGS. 8 and 10.

[0395] The first inclined portion (111a) may be provided on the upper surface of the first protrusion (111) of the upper fixed body (100a), i.e., the fixed body (100) located at the upper portion of the first chamber (351).

[0396] The first inclined portion (111a) is formed to slope inwardly as it increases upward from the upper surface of the first protrusion (111).

[0397] The second slope (112a) may be provided on the upper surface of the second protrusion (112) of the upper fixture (100a), i.e., the fixture (100) located at the lower portion of the first chamber (351).

[0398] The second inclined portion (112a) is formed to slope inwardly as it increases upward from the upper surface of the second protrusion (112).

[0399] The first slope part (111a) and the second slope part (112a) have a function of preventing damage to the first sealing part (400) and the second sealing part (500) when the fixed body (100) is inserted into the rotating body (200) and the fixed body (100) is connected.

[0400] To explain in detail, when the rotating body (200) and the fixed body (100) are combined, the rotating body (200) is turned upside down while the first sealing part (400), the second sealing part (500), and the third sealing part (600) are combined on the inside of the rotating body (200), and then the fixed body (100) is inserted into the inside of the rotating body (200).

[0401] The fixed body (100) is inserted into the inner hollow of the rotating body (200) in the order of the first protrusion (111), the second protrusion (112), and the third protrusion (113).

[0402] When the fixture (100) is inserted, the first to third ribs (414, 424, 434) of the first sealing portion (400) and the second to second ribs (524) of the second sealing portion (500) protrude in the opposite direction to the direction in which the fixture (100) is inserted (i.e., upward with respect to the upside-down rotating body (200).

[0403] In addition, as described above, in order to increase the sealing property, the inner surface of the first to first-third ribs (414, 424, 434) and the second to second ribs (524) and the outer surface of the fixture (100) have a minus tolerance, so that when the fixture (100) is inserted, the upper surface of the first protrusion (111) and the second protrusion (112) come into contact with the second-second rib (524) and the first to first-third ribs (414, 424, 434), and the second-second rib (524) and the first to first-third ribs (414, 424, 434) may be damaged.

[0404] Accordingly, the first inclined portion (111a) prevents the second-second rib (524) and the first-first to first-third ribs (414, 424, 434) from directly contacting the upper surface of the first protrusion (111) when the upper fixed body (100a) is inserted into the inner hollow of the rotating body (200), thereby preventing damage to the second-second rib (524) and the first-first to first-third ribs (414, 424, 434).

[0405] In addition, the second slope (112a) prevents the second-second rib (524) from directly contacting the upper surface of the second protrusion (112) when the upper fixed body (100a) is inserted into the inner hollow of the rotating body (200), thereby preventing damage to the second-second rib (524).

[0406] First and second air vent passages (171, 172) and first to third temperature sensors (181, 182, 183)

[0407] The rotary joint (10) of the present invention may be configured to further include first and second air vent channels (171, 172) and first to third temperature sensors (181, 182, 183), as shown in FIG. 3.

[0408] The first air vent euro (171) is connected to the upper part of the first chamber (351) and is provided in the fixture (100) to discharge air from the first chamber (351).

[0409] More specifically, the first air vent passage (171) is formed to penetrate vertically from the upper portion of the first chamber (351) toward the upper fixture (100a), and then is bent inwardly to penetrate left and right into the inner portion of the upper fixture (100a). Accordingly, the first air vent passage (171) is connected to the hollow portion (105) provided on the inner portion of the upper fixture (100a).

[0410] The first air vent euro (171) has the function of discharging air from the air pocket existing in the upper part of the first chamber (351) to the outside of the rotary joint (10) through the hollow (105).

[0411] The second air vent euro (172) is connected to the upper part of the second chamber (352) and is provided in the fixture (100) to discharge air from the second chamber (352).

[0412] More specifically, the second air vent passage (172) is formed to penetrate vertically from the upper portion of the second chamber (352) toward the upper fixture (100a), and then is bent inwardly to penetrate left and right into the inner portion of the upper fixture (100a). Accordingly, the second air vent passage (172) is connected to the hollow portion (105) provided on the inner portion of the upper fixture (100a).

[0413] The second air vent euro (172) has the function of discharging air from the air pocket existing in the upper part of the second chamber (352) to the outside of the rotary joint (10) through the hollow (105).

[0414] The second air vent passage (172) is arranged below the first air vent passage (171).

[0415] The first temperature sensor (181) may be provided inside the first protrusion (111) of the fixture (100) to measure the temperature of the first sealing portion (400).

[0416] The first temperature sensor (181) is located at a position corresponding to the first sealing portion installation space (371) and can measure the temperature of the first sealing portion (400).

[0417] The second temperature sensor (182) may be provided inside the second protrusion (112) of the fixture (100) to measure the temperature of the second sealing portion (500).

[0418] The second temperature sensor (182) is located at a position corresponding to the second sealing part installation space (372) and can measure the temperature of the second sealing part (500).

[0419] The third temperature sensor (183) may be provided inside the third protrusion (113) of the fixture (100) to measure the temperature of the third sealing portion (600).

[0420] The third temperature sensor (183) is located at a position corresponding to the third sealing part installation space (373) and can measure the temperature of the third sealing part (600).

[0421] The first to third temperature sensors (181, 182, 183) are connected to a control unit (not shown), and the temperature measured by the first to third temperature sensors (181, 182, 183) can be monitored through the control unit.

[0422] The wires connected to each of the first to third temperature sensors (181, 182, 183) can be connected to the control unit and other electrical devices through the hollow (105).

[0423] As described above, the first to third temperature sensors (181, 182, 183) measure the temperature of the first to third sealing parts (600), thereby monitoring the status of the first to third sealing parts (600) of the rotary joint (10), and through this, it is possible to easily determine whether the first to third sealing parts (600) need to be replaced or are damaged.

[0424] As described above, the present invention has been described with reference to preferred embodiments thereof, but it will be apparent to those skilled in the art that various modifications or variations may be made to the present invention without departing from the spirit and scope of the present invention as set forth in the following claims.

[0425] [Explanation of symbols]

[0426] 10: Rotary joint

[0427] 20: Coating layer

[0428] 30: Coating groove

[0429] 100: Fixed body

[0430] 100a: Upper fixture

[0431] 100b: Lower fixture

[0432] 105: Hollow

[0433] 111: First projection

[0434] 111a: 1st slope

[0435] 112: Second protrusion

[0436] 112a: 2nd slope

[0437] 113: Third protrusion

[0438] 120: Flange

[0439] 131: First bulkhead

[0440] 132: Second bulkhead

[0441] 151: First communication chamber

[0442] 152: Second communication chamber

[0443] 161: Supply pipe

[0444] 162: Recovery pipe

[0445] 171: First air vent euro

[0446] 172: Second air vent euro

[0447] 181: First temperature sensor

[0448] 182: Second temperature sensor

[0449] 183: Third temperature sensor

[0450] 200: Rotor

[0451] 210: Supply Euro

[0452] 220: Recovery Euro

[0453] 230: Support protrusion

[0454] 310: First bearing section

[0455] 311: First bearing

[0456] 320: Second bearing section

[0457] 321: Second bearing

[0458] 351: Chamber 1

[0459] 352: Second Chamber

[0460] 353: Third Chamber

[0461] 354: Chamber 4

[0462] 371: Installation space for the first sealing part

[0463] 372: Second sealing section installation space

[0464] 373: Third sealing section installation space

[0465] 400: First sealing section

[0466] 410: Sealing member No. 1-1

[0467] 411: O-ring groove 1-1

[0468] 412: O-ring 1-1

[0469] 413: 1-1 Spring Home

[0470] 414: 1st rib

[0471] 415: Spring 1-1

[0472] 420: 1-2 sealing member

[0473] 421: O-ring grooves 1-2

[0474] 422: O-ring 1-2

[0475] 423: 1st-2nd spring home

[0476] 424: 1st-2nd ribs

[0477] 425: 1st-2nd spring

[0478] 430: 1-3 sealing member

[0479] 431: O-ring grooves 1-3

[0480] 432: O-rings 1-3

[0481] 433: 1st-3rd spring home

[0482] 434: 1st-3rd ribs

[0483] 435: Springs 1-3

[0484] 440: No. 1-1 bending prevention ring

[0485] 441: 1-1 Drain Home

[0486] 450: 1-2nd bend prevention ring

[0487] 451: 1-2 Drain Home

[0488] 460: 1-3 bend prevention ring

[0489] 461: 1-3 Drain Home

[0490] 481: Spacer 1-1

[0491] 500: Second sealing section

[0492] 510: Sealing member 2-1

[0493] 511: 2-1 O-ring groove

[0494] 512: O-ring 2-1

[0495] 513: 2nd-1st Spring Home

[0496] 514: 2nd-1st rib

[0497] 515: Spring 2-1

[0498] 520: 2-2 sealing member

[0499] 521: 2nd O-ring groove

[0500] 522: 2nd O-ring

[0501] 523: 2nd Spring Home

[0502] 524: 2nd-2nd rib

[0503] 525: 2nd Spring

[0504] 540: 2-1 Anti-bending ring

[0505] 571: Holder 2-1

[0506] 572: Holder 2-2

[0507] 581: 2-1 Spacer

[0508] 582: 2nd Spacer

[0509] 600: Third sealing section

[0510] 610: Sealing member No. 3-1

[0511] 611: O-ring groove 3-1

[0512] 612: O-ring 3-1

[0513] 613: 3-1 Spring Home

[0514] 614: 3-1st rib

[0515] 615: 3-1 Spring

[0516] 620: Sealing member 3-2

[0517] 621: O-ring groove 3-2

[0518] 622: O-ring 3-2

[0519] 623: 3-2 Spring Home

[0520] 624: 3rd-2nd rib

[0521] 625: 3rd-2nd Spring

[0522] 630: 3-3 sealing member

[0523] 631: O-ring groove 3-3

[0524] 632: O-ring 3-3

[0525] 633: 3rd-3rd Spring Home

[0526] 634: 3rd-3rd rib

[0527] 635: 3rd-3rd Spring

[0528] 640: 3-1 Anti-Bending Ring

[0529] 641: 3-1 Drain Home

[0530] 650: 3-2 Anti-Bending Ring

[0531] 651: 3-2 Drain Home

[0532] 671: Holder 3-1

[0533] 672: Holder 3-2

[0534] 681: 3-1 Spacer

[0535] 682: 3-2 Spacer

[0536] 711: First drain hole

[0537] 712: Second drain hole

[0538] 713: Third drain hole

[0539] 731: First drain euro

[0540] 732: Second drain euro

Claims

1. Fixed body; A rotating body having a supply path and a return path and rotating relative to the fixed body on the outside of the fixed body; A first chamber provided between the above fixed body and the above rotating body and connected to the supply path; A second chamber provided between the fixed body and the rotating body so as to be positioned at the lower portion of the first chamber and connected to the recovery path; A supply pipe provided in the above fixture and communicating with the first chamber; A recovery pipe provided in the above-mentioned fixture and communicating with the second chamber; and A first sealing portion is provided between the fixed body and the rotating body and is located at the upper portion of the first chamber; The above first sealing part, A 1-1 sealing member having a 1-1 O-ring on the outside; A first-second sealing member having a first-second O-ring on the outside and positioned below the first-first sealing member; A 1-3 sealing member having a 1-3 O-ring on the outside and positioned below the 1-2 sealing member; A first-first bending prevention ring interposed between the first-first sealing member and the first-second sealing member; and A rotary joint comprising a first-second bending prevention ring interposed between the first-second sealing member and the first-third sealing member.

2. In paragraph 1, The above first sealing part, A 1-3 bending prevention ring arranged on the upper portion of the 1-1 sealing member; and A rotary joint further comprising a first-first spacer disposed below the first-third sealing member.

3. In paragraph 1, The above fixture is made of aluminum, A rotary joint having a coating layer provided on the outer surface of the fixed body in contact with the first sealing portion.

4. In paragraph 3, A rotary joint wherein the above coating layer is coated with amorphous powder.

5. In paragraph 3, A rotary joint, wherein the coating layer is provided inside a coating groove formed on the outer surface of the fixture.

6. In paragraph 1, A second sealing portion provided between the fixed body and the rotating body and positioned between the lower portion of the first chamber and the upper portion of the second chamber; and It further includes a third sealing part provided between the fixed body and the rotating body and located at the lower part of the second chamber; The above second sealing part, A 2-1 sealing member having a 2-1 O-ring on the outside; A second-2 sealing member having a second-2 O-ring on the outside and positioned below the second-1 sealing member; A second-1 bending prevention ring interposed between the second-1 sealing member and the second-2 sealing member; A 2-1 holder arranged on the upper part of the 2-1 sealing member and coupled to the rotating body; A 2-1 spacer interposed between the 2-1 holder and the 2-1 sealing member; A second-2 holder disposed at the lower portion of the second-2 sealing member and coupled to the rotating body; and Including a 2-2 spacer interposed between the 2-2 holder and the 2-2 sealing member; The above third sealing part, A 3-1 sealing member having a 3-1 O-ring on the outside; A 3-2 sealing member having a 3-2 O-ring on the outside and positioned below the 3-1 sealing member; A 3-3 sealing member having a 3-3 O-ring on the outside and positioned below the 3-2 sealing member; A 3-1 bending prevention ring interposed between the 3-1 sealing member and the 3-2 sealing member; A 3-2 bending prevention ring interposed between the 3-2 sealing member and the 3-3 sealing member; A 3-1 holder arranged on the upper part of the 3-1 sealing member and coupled to the rotating body; A 3-1 spacer interposed between the 3-1 holder and the 3-1 sealing member; A 3-2 holder arranged at the bottom of the 3-3 sealing member and coupled to the rotating body; and A rotary joint including a 3-2 spacer interposed between the 3-2 holder and the 3-3 sealing member.

7. In paragraph 6, The above first sealing part, The first to third spring grooves each having a shape sunken upward from the lower surface of the first to third sealing members; The first to third ribs each having a shape protruding downward from the lower portion of the first to third sealing members and located on the inner side of the first to third spring grooves; and Further comprising: first-1 to first-3 springs inserted into each of the first-1 to first-3 spring grooves to pressurize each of the first-1 to first-3 ribs inward; The above second sealing part, A second-1 spring groove having a shape sunken downward from the upper surface of the second-1 sealing member; A second-second spring groove having a shape sunken upward from the lower surface of the second-second sealing member; A second-1 rib having a shape protruding upward from the upper portion of the second-1 sealing member and located on the inner side of the second-1 spring groove; A second-2 rib having a shape protruding downward from the lower portion of the second-2 sealing member and located on the inner side of the second-2 spring groove; and Further comprising a second-1, second-2 spring inserted into each of the second-1, second-2 spring grooves to pressurize each of the second-1, second-2 ribs inwardly; The above third sealing part, The 3rd-1st to 3rd-3rd spring grooves each having a shape sunken downward from the upper surface of the 3rd-1st to 3rd-3rd sealing members; The 3-1 to 3-3 ribs each having a shape protruding upward from the upper portion of the 3-1 to 3-3 sealing members and located on the inner side of the 3-1 to 3-3 spring grooves; and A rotary joint further comprising: a third-1 to third-3 spring inserted into each of the third-1 to third-3 spring grooves to press each of the third-1 to third-3 ribs inwardly; 8. In paragraph 6, The first sealing part is arranged, and the first sealing part installation space is formed by a space between the rotating body and the fixed body, and is located at the upper part of the first chamber; The third sealing part is arranged, and is formed as a space between the rotating body and the fixed body, and the third sealing part installation space is located at the lower part of the second chamber; A first drain hole provided on the inside of the rotating body so as to communicate with one side of the first sealing portion installation space; A second drain hole provided on the inside of the rotating body so as to communicate with one side of the third sealing portion installation space; A first drain path connecting the first drain hole and the second drain hole; A third drain hole provided on the outside of the fixture so as to communicate with the third sealing portion installation space; and Further comprising a second drain path that is connected to the third drain hole and recovers the fluid leaked into the first and third sealing part installation spaces; The above first sealing part, A 1-1 drain groove provided on one side of the 1-1 bending prevention ring; A first-second drain groove provided on one side of the first-second bending prevention ring; and Further comprising a 1-3 drain groove provided on one side of the 1-3 bending prevention ring; The above third sealing part, A 3-1 drain groove provided on one side of the 3-1 bending prevention ring; and Further comprising a 3-2 drain groove provided on one side of the 3-2 bending prevention ring; The first to third drain grooves of the sink are connected to the first drain hole, The above 3-1 and 3-2 drain grooves are rotary joints that communicate with the above 2nd and 3rd drain holes.

9. In paragraph 1, A rotary joint further comprising a first air vent passage provided in the fixture to communicate with the upper portion of the first chamber and discharge air from the first chamber.

10. In paragraph 1, A rotary joint further comprising a first temperature sensor provided in the fixture to measure the temperature of the first sealing portion.

11. In paragraph 1, A first inclined portion provided on the upper surface of the first protrusion of the fixed body located at the upper portion of the first chamber so as to be inclined inwardly as it goes upward; and A rotary joint further comprising a second inclined portion provided on the upper surface of the second protrusion of the fixed body located at the lower portion of the first chamber, the second inclined portion being inclined inwardly as it goes upward.

12. In paragraph 1, A third chamber provided inside the above-mentioned fixture, located at the lower portion of the above-mentioned second chamber, and communicating with the above-mentioned supply pipe; A fourth chamber provided inside the above-mentioned fixture, located at the lower portion of the second chamber, and communicating with the recovery pipe; A first communication chamber provided between the lower part of the first chamber and the upper part of the third chamber within the fixture to communicate the first chamber and the third chamber; and A rotary joint further comprising a second communication chamber provided at the lower portion of the second chamber and the upper portion of the fourth chamber within the fixed body to communicate the second chamber and the fourth chamber.

13. Fixed body; A rotating body having a supply path and a return path and rotating relative to the fixed body on the outside of the fixed body; A first chamber provided between the above fixed body and the above rotating body and connected to the supply path; A second chamber provided between the fixed body and the rotating body so as to be positioned at the lower portion of the first chamber and connected to the recovery path; A supply pipe provided in the above fixture and communicating with the first chamber; A recovery pipe provided in the above-mentioned fixture and communicating with the second chamber; and A second sealing part is provided between the fixed body and the rotating body and is positioned between the lower part of the first chamber and the upper part of the second chamber; The above second sealing part, A 2-1 sealing member having a 2-1 O-ring on the outside; A second-2 sealing member having a second-2 O-ring on the outside and positioned below the second-1 sealing member; and A rotary joint comprising a second-first bending prevention ring interposed between the second-first sealing member and the second-second sealing member.

14. Fixed body; A rotating body having a supply path and a return path and rotating relative to the fixed body on the outside of the fixed body; A first chamber provided between the above fixed body and the above rotating body and connected to the supply path; A second chamber provided between the fixed body and the rotating body so as to be positioned at the lower portion of the first chamber and connected to the recovery path; A supply pipe provided in the above fixture and communicating with the first chamber; A recovery pipe provided in the above-mentioned fixture and communicating with the second chamber; and It further includes a third sealing part provided between the fixed body and the rotating body and located at the lower part of the second chamber; The above third sealing part, A 3-1 sealing member having a 3-1 O-ring on the outside; A 3-2 sealing member having a 3-2 O-ring on the outside and positioned below the 3-1 sealing member; A 3-3 sealing member having a 3-3 O-ring on the outside and positioned below the 3-2 sealing member; A 3-1 bending prevention ring interposed between the 3-1 sealing member and the 3-2 sealing member; and A rotary joint comprising a third-second bending prevention ring interposed between the third-second sealing member and the third-third sealing member.

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