A multifunctional rotary joint

Abstract

The application discloses a kind of multifunctional rotary joints, belong to pipeline joint technical field, with coaxially arranged valve shell and hollow shaft, the valve shell has the access end for hollow shaft to pass through, the valve shell includes by shell formed inner interface cavity, shell and hollow cavity, the valve shell further includes at least four fluid interfaces passing through shell, hollow cavity and directly through inner interface cavity, the four fluid interfaces are respectively first fluid interface, second fluid interface, third fluid interface and fourth fluid interface, the valve shell further includes at least two cooling liquid connectors passing through shell and communicating the hollow cavity;Spiral partition is arranged in the hollow cavity with the direction of the central axis of hollow shaft as axial, and the spiral partition separates hollow cavity into spiral flow channel.The application can be used to transport different kinds of medium, also can transport same medium, can effectively reduce the problem that rotary joint radiates slowly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipe joints, in particular to a multifunctional rotary joint. BACKGROUND

[0002] The rotary joint is assembled between the fixed supply pipeline and the rotating roller as a mechanical sealing component to realize dynamic sealing of fluid medium in the input and output process. According to different working conditions, the rotary joint is suitable for steam, cold and hot water, gas, high-temperature hot oil and other media under different pressure, speed and temperature environments.

[0003] With the development of domestic pipe joint technology, the number of hydraulic control pipelines increases accordingly. The single-channel rotary joint can only meet the connection control of a single hydraulic pipeline and cannot meet the overall design and overall arrangement requirements of large equipment. A multi-channel rotatable connection joint capable of realizing dynamic and static high-pressure sealing conditions is urgently needed to realize the simultaneous connection of multiple pipelines. However, the existing rotary joint structure needs to be optimized and has problems such as easy water leakage and slow heat dissipation. SUMMARY

[0004] The main purpose of the present application is to provide a multifunctional rotary joint to solve the above-mentioned problem of quickly adapting to the functional requirements of multiple pipelines of liquid medium under changing working conditions.

[0005] In order to achieve the above-mentioned application purpose, the present application adopts the following technical solutions:

[0006] A multifunctional rotary joint has a coaxially arranged valve shell and a hollow shaft. The valve shell has an access end through which the hollow shaft passes. The two ends of the hollow shaft are axially fixed with the access end of the valve shell through flanges, and a sealing lip and a bearing are arranged between the access end and the hollow shaft.

[0007] The valve shell includes an inner interface cavity formed by a shell, an outer shell and a hollow cavity. The valve shell further includes at least four fluid interfaces passing through the outer shell, the hollow cavity and directly through the inner interface cavity. The four fluid interfaces are respectively a first fluid interface, a second fluid interface, a third fluid interface and a fourth fluid interface. The valve shell further includes at least two cooling liquid connectors passing through the outer shell and communicating with the hollow cavity.

[0008] The hollow shaft has a main flow channel arranged along its axis, and a first flow channel, a second flow channel, a third flow channel and a fourth flow channel distributed circumferentially along its axis and corresponding to the first fluid interface, the second fluid interface, the third fluid interface and the fourth fluid interface in turn.

[0009] The hollow cavity is provided with a spiral partition plate with the central axis direction of the hollow shaft as the axial direction, and the spiral partition plate divides the hollow cavity into a spiral flow channel. The cooling liquid connector includes a liquid injection connector and a liquid outlet connector.

[0010] Further, the valve housing is further provided with a fifth fluid interface and a sixth fluid interface, and the hollow shaft is further provided with a fifth flow channel and a sixth flow channel corresponding to the fifth fluid interface and the sixth fluid interface.

[0011] Further, among the first fluid interface, the second fluid interface, the third fluid interface and the fourth fluid interface, the adjacent fluid interfaces are opposite to each other with respect to the valve housing axis and are arranged in the axial direction, and the spaced fluid interfaces have parallel central axes, and the parallel central axes are coplanar with the central axis of the valve housing.

[0012] As an optimization scheme of the present application, the valve housing is provided with an annular pressure stabilizing adjusting cavity coaxial with the hollow shaft between the second fluid interface and the third fluid interface, and a pressure stabilizing adjusting ring is arranged in the annular pressure stabilizing adjusting cavity, and the pressure stabilizing adjusting ring comprises a pair of annular supports and a fan-shaped wedge block;

[0013] The annular support is uniformly provided with four fan-shaped wedge block grooves in the circumferential direction, and the annular support has a communication part between adjacent wedge block grooves, and the annular support has a fan-shaped rib plate forming the wedge block groove between the communication parts, and the fan-shaped wedge block is used for embedding in the wedge block groove and forming a smooth circular ring structure with the annular support;

[0014] The fan-shaped wedge block is provided with a fan-shaped flow channel coaxial with the annular support at the end face, and the fan-shaped wedge block is divided into a full-pass fan-shaped wedge block, a clockwise-pass fan-shaped wedge block and a counterclockwise-pass fan-shaped wedge block according to the fan-shaped flow channel penetrating through the side surface of the fan-shaped wedge block at both ends, penetrating through the side surface of the fan-shaped wedge block in the clockwise direction and penetrating through the side surface of the fan-shaped wedge block in the counterclockwise direction.

[0015] The communication part is provided with a communication flow channel with the same width and coaxial with the fan-shaped flow channel;

[0016] The fan-shaped rib plates of the pair of annular supports are opposite and tightly abutted, and the fan-shaped rib plates are embedded to form the pressure stabilizing adjusting ring at the abutting end face;

[0017] The valve housing is provided with a pressure stabilizing flow channel for communicating the annular pressure stabilizing adjusting cavity in the axial direction of the valve housing by the first fluid interface, the second fluid interface, the third fluid interface and the fourth fluid interface.

[0018] Further, one of the annular supports is provided with an embedding column symmetrically centered with respect to the central axis at the abutting end face, and the other annular support is provided with an embedding groove corresponding to the embedding column.

[0019] Further, the ring-shaped support has a connecting part with a through hole, and through relative rotation between the pair of ring-shaped supports, when the connecting parts with the through holes of the pair of ring-shaped supports correspond to each other, the two through holes communicate with each other, and when the connecting parts with the through holes of the pair of ring-shaped supports are misaligned, the two through holes are closed by the end faces.

[0020] Further, the fan ring wedge is slidably assembled with the fan ring rib plate through a sliding groove.

[0021] Further, the ring-shaped support is made of sealing rubber material, and a wear-resistant sealing gasket is further arranged between the ring-shaped support and the hollow shaft.

[0022] The application has the advantages of:

[0023] The multifunctional rotary joint can simultaneously transport multiple-channel fluid media, provides multiple sealing structures, can be used for transporting different types of media, can also transport the same type of media, can effectively reduce the problem of slow heat dissipation of the rotary joint, avoids the problem of jamming caused by the expansion of the internal rotary joint due to heating, and increases the reliability of the rotary joint.

[0024] And when the medium transmitted by the multiple fluid channels changes according to the change of the working condition, there is a need for liquid medium to flow or not to flow between the multiple fluid channels, and the usual solution is to replace the rotary joint, but the replaced rotary joint may not be compatible with the original pipeline arrangement, often requiring modification and construction of the original pipeline, which is not conducive to improving production efficiency and saving costs, and the application can change the flow state of the multiple fluid pipes without replacing the rotary joint and the arrangement of the fluid pipeline, thereby adapting to multiple working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application. The embodiments illustrated in the drawings provide one or more best modes contemplated for carrying out the application, and no limitation, implicit or explicit, on the application is intended. In the drawings:

[0026] Figure 1 is a perspective view of the multifunctional rotary joint of the application.

[0027] Figure 2 is a cross-sectional view of the multifunctional rotary joint of the application.

[0028] Figure 3 is another cross-sectional view of the multifunctional rotary joint of the application.

[0029] Figure 4 is a side view of the multifunctional rotary joint of the application.

[0030] Figure 5 is the front view of the ring-shaped stent in the present application.

[0031] Figure 6 is the back view of the ring-shaped stent in the present application.

[0032] Figure 7 is the side view of the ring-shaped stent in the present application.

[0033] Figure 8 is the arrangement schematic diagram of the fan ring wedge block in one embodiment.

[0034] Figure 9 is the arrangement schematic diagram of the fan ring wedge block in one embodiment.

[0035] Figure 10 is the arrangement schematic diagram of the fan ring wedge block in one embodiment.

[0036] Figure 11 is the arrangement schematic diagram of the fan ring wedge block in one embodiment.

[0037] Figure 12 is the arrangement schematic diagram of the fan ring wedge block in one embodiment.

[0038] Figure 13 is the arrangement schematic diagram of the fan ring wedge block in one embodiment.

[0039] Figure 14 is the arrangement schematic diagram of the fan ring wedge block in one embodiment.

[0040] Figure 15 is the arrangement schematic diagram of the fan ring wedge block in one embodiment.

[0041] Figure 16 is the arrangement schematic diagram of the fan ring wedge block in one embodiment.

[0042] Figure 17 is the arrangement schematic diagram of the fan ring wedge block in one embodiment.

[0043] Figure 18 is the arrangement schematic diagram of the fan ring wedge block in one embodiment. DETAILED DESCRIPTION

[0044] In order to enable persons skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by persons skilled in the art without creative labor should fall within the protection scope of the present application.

[0045] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0046] In this application, terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "center," "vertical," "horizontal," "transverse," and "longitudinal" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe this application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.

[0047] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0048] Furthermore, the terms "installed," "disposed," "provided with," "connected," "connected," and "socketed" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0049] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0050] like Figures 1 to 7 The present invention shown provides a multifunctional rotary joint having a coaxially arranged valve housing 100 and a hollow shaft 200. The valve housing 100 has an access end for the hollow shaft 200 to pass through. Both ends of the hollow shaft 200 and the access end of the valve housing 100 are axially fixed by flanges 300. A sealing lip 400 and a bearing 500 are provided between the access end and the hollow shaft 200.

[0051] Among them, the bearings are high-precision deep groove ball bearings, and the access ends of the bearings on both sides of the valve housing serve as the load-bearing and support for the rotary joint rotor and stator (hollow shaft, valve housing), maintaining the smooth operation of the product.

[0052] The valve housing 100 includes an inner cavity 110, an outer shell 120, and a hollow cavity 130 formed by a shell. The valve housing 100 also includes at least four fluid interfaces that pass through the outer shell 120 and the hollow cavity 130 and directly connect to the inner cavity 110. The four fluid interfaces are a first fluid interface Y1, a second fluid interface Y2, a third fluid interface Y3, and a fourth fluid interface Y4. The valve housing 100 also includes at least two coolant connectors 140 that pass through the outer shell 120 and connect to the hollow cavity 130.

[0053] The hollow shaft 200 is assembled in the internal connection cavity 110 and has a main flow channel 210 extending through the hollow shaft 200 along its axis, as well as a first flow channel C1, a second flow channel C2, a third flow channel C3, and a fourth flow channel C4 distributed circumferentially along the hollow shaft 200 and corresponding to the first fluid interface Y1, the second fluid interface Y2, the third fluid interface Y3, and the fourth fluid interface Y4, respectively.

[0054] A spiral partition 210 is provided in the hollow cavity 130 with the central axis direction of the hollow shaft 200 as the axial direction, and the spiral partition 210 divides the hollow cavity 130 into a spiral flow channel. The coolant connector includes a liquid injection connector Q1 and a liquid outlet connector Q2.

[0055] As a preferred solution, Figure 3 As shown, the liquid injection joint Q1 and the liquid outlet joint Q2 each include two, and are symmetrically arranged along the length direction of the valve housing, and the hollow cavity 130 is divided into two spiral flow channels by a partition in the middle of the valve housing 100, thereby further enhancing the cooling effect of the rotary joint through the two spiral flow channels.

[0056] In the present invention, the spiral flow channel flows through the outer surface of the bearing, so that the bearing can be cooled nearby to prevent the bearing from being stuck due to thermal expansion.

[0057] In the present invention, the valve housing is further provided with a fifth fluid interface S1 and a sixth fluid interface S2. Correspondingly, the hollow shaft 200 also has a fifth flow channel C5 and a sixth flow channel C6 corresponding to the fifth fluid interface S1 and the sixth fluid interface S2.

[0058] In one of the embodiments, the first fluid interface Y1, the second fluid interface Y2, the third fluid interface Y3 and the fourth fluid interface Y4 and the corresponding first flow channel C1, the second flow channel C2, the third flow channel C3 and the fourth flow channel C4 can be used to transport hydraulic oil medium, the fifth fluid interface S1, the sixth fluid interface S2 and the corresponding fifth flow channel C5 and the sixth flow channel C6 can be used to transport internal cooling medium, and the main flow channel 210 is used to transport compressed air, and the working parameters are as follows:

[0059] The number of loops: 4-way hydraulic oil / 30MPa, 2-way cooling medium (cooling water / ethanol) / 5MPa, 1-way compressed air / 1.2MPa;

[0060] Working temperature: -20~+80℃;

[0061] Rotational speed: ≤180RPM (actual maximum speed) / 200RPM (design maximum speed);

[0062] Structural material: carbon steel;

[0063] Passage diameter: hydraulic oil φ20mm, cooling liquid φ13mm, compressed air φ30mm;

[0064] Flow rate: hydraulic oil 100L / min, cooling water 20L / min, compressed air 6Nm 3 / min.

[0065] The application can be applied to a gas-liquid function integrated system, and provides a 360° unlimited rotation and conduction function for a client, including realizing hydraulic oil, water and gas path supply.

[0066] As shown in Figure 2 and Figure 3 , in order to ensure that the performance of the product is more stable and the service life is longer, a circulating water path is formed in the valve shell 100, so that the entire outer shell of the rotary joint is wrapped by the cooling liquid, and the cooling effect of the cooling liquid is ensured.

[0067] In order to facilitate more regular arrangement of fluid pipes and facilitate the setting of the spiral partition plate 210 in the hollow cavity 130, among the first fluid interface Y1, the second fluid interface Y2, the third fluid interface Y3 and the fourth fluid interface Y4, the adjacent fluid interfaces are opposite about the axis of the valve shell 100 and are arranged in the axial direction, the spaced fluid interfaces have parallel central axes, and the parallel central axes are coplanar with the central axis of the valve shell 100, and meanwhile, every three adjacent fluid interfaces are arranged in a staggered arrangement mode of a "pin" shape, so that more joint numbers can be arranged in a limited length range of the valve shell 100, and the optimization of structural strength is facilitated.

[0068] As an optimization scheme of the present application, the valve housing 100 is provided with an annular pressure regulating cavity 150 coaxial with the hollow shaft 200 between the second fluid interface Y2 and the third fluid interface Y3, and a pressure regulating ring 600 is arranged in the annular pressure regulating cavity 150.

[0069] As shown in the drawings, the annular support 610 is uniformly provided with four fan-shaped wedge block grooves 611 in the circumferential direction, and the annular support 610 has a communication part 612 between adjacent wedge block grooves 611, and the annular support 610 has a fan-shaped rib plate 613 forming the wedge block groove 611 between the communication parts 612, and the fan-shaped wedge block 620 is used to be embedded in the wedge block groove 611 and form a smooth annular structure with the annular support 610. Figures 5 to 7 As shown in the drawings, the fan-shaped wedge block 620 is provided with a fan-shaped flow channel 621 coaxial with the annular support 610 at its end face, and the fan-shaped wedge block 620 is divided into a full-through fan-shaped wedge block M1, a clockwise-through fan-shaped wedge block M2, and a counterclockwise-through fan-shaped wedge block M3 according to the penetration of the fan-shaped flow channel 621 at both ends of the fan-shaped wedge block 620, the penetration of the fan-shaped flow channel 621 at one end of the fan-shaped wedge block 620 in the clockwise direction, and the penetration of the fan-shaped flow channel 621 at one end of the fan-shaped wedge block 620 in the counterclockwise direction.

[0070] Figures 8 to 18 The communication part 612 is provided with a communication flow channel 614 which is coaxial with the fan-shaped flow channel 621 and has the same width.

[0071] The fan-shaped rib plates 614 of the pair of annular supports 610 are oppositely abutted and embedded to form the pressure regulating ring 600 at the abutting end face 615.

[0072] The valve housing 100 is provided with a pressure regulating flow channel 160 which communicates the annular pressure regulating cavity 150 in the axial direction of the valve housing 100 through the first fluid interface Y1, the second fluid interface Y2, the third fluid interface Y3, and the fourth fluid interface Y4.

[0073] From the above structure, by arranging the full-through fan-shaped wedge block M1, the clockwise-through fan-shaped wedge block M2, and the counterclockwise-through fan-shaped wedge block M3 on the annular support 610, the first fluid interface Y1 and the second fluid interface Y2 can be connected or disconnected, and the third fluid interface Y3 and the fourth fluid interface Y4 can be connected or disconnected, thereby realizing four flow state combinations.

[0074] Further, one of the annular supports 610 is provided with an embedded column 616 which is symmetric about the central axis at the abutting end face 615, and the other annular support 610 is provided with an embedded groove corresponding to the embedded column 616.

[0075] Further, one of the annular supports 610 is provided with an embedded column 616 which is symmetric about the central axis at the abutting end face 615, and the other annular support 610 is provided with an embedded groove corresponding to the embedded column 616.

[0076] ​Further, the annular support 610 has a connecting part 612 with a through hole 617, and through relative rotation between the pair of annular supports 610, when the connecting parts 612 with the through holes 617 of the pair of annular supports 610 correspond to each other, the two through holes 617 are communicated with each other, and when the connecting parts 612 with the through holes 617 of the pair of annular supports 610 are misaligned, the two through holes 617 are closed by the abutting end face 615.

[0077] Through relative rotation of the annular support 610 and arrangement of the fan ring wedge block 620, the circuit is broken as indicated by " / " and the passage is indicated by "-", so that eleven different flow state combinations of "Y1 / Y2 / Y3 / Y4 (such as Figure 8 ), Y1-Y2 / Y3-Y4 (such as Figure 9 ), Y1 / Y2 / Y3-Y4 (such as Figure 10 ), Y1-Y2 / Y3-Y4 (such as Figure 11 ), Y1-Y2-Y3-Y4 (such as Figure 12 ), Y1-Y3 / Y4 / Y2 (such as Figure 13 ), Y1-Y3-Y4 / Y2 (such as Figure 14 ), Y1-Y2-Y4 / Y3 (such as Figure 15 ), Y1 / Y2-Y4 / Y3 (such as Figure 16 ), Y1 / Y2-Y3-Y4 (such as Figure 17 ), Y1-Y2-Y3 / Y4 (such as Figure 18 )" can be realized, and in the eleven different flow state combinations, the number and type of the fan ring wedge blocks 620 used are completely consistent, so that the purpose of switching the flow state can be achieved without replacing the fan ring wedge blocks 620, the complex working conditions between the multi-medium pipelines are realized, and it is worth noting that the application does not need to set electronic devices such as electromagnetic valves in the rotary joint, and only uses structural parts to change the flow state by disassembling and assembling the rotary joint, so that the service life and reliability of the product can be greatly improved under high pressure and high temperature conditions, and the failure rate of the rotary joint is reduced.

[0078] Taking the above Figure 11 as an example, the Y1 medium and the Y2 medium flow to the pressure stabilizing flow channel 160 at the same time, and are communicated with each other through the fan ring flow channel 621 to maintain the balance of the medium pressure in Y1 and Y2, and similarly, the Y3 medium and the Y4 medium flow to the pressure stabilizing flow channel 160 at the same time, and are communicated with each other through the fan ring flow channel 621 to maintain the balance of the medium pressure in Y3 and Y4, that is, "Y1-Y2 / Y3-Y4". As Figure 8As shown, since the upper half of the sector ring flow channel 621 formed by M2 and M1 and the lower half of the sector ring flow channel 621 formed by M1 and M3 are not connected, and the central angles of the upper half and the lower half are both less than 180°, the pressure regulating flow channel 160 connected by Y1 and Y2 cannot flow into the same sector ring flow channel at the same time, so that the medium between Y1 and Y2 cannot be connected and maintain the same pressure level. Similarly, Y3 and Y4 are not connected, that is, "Y1 / Y2 / Y3 / Y4". As shown in Figure 12 As shown, at this time, the pair of annular supports 610 in the pressure regulating ring 600 rotate relative to each other so that the through holes 617 are connected to each other, and Figure 11 In comparison, Y2 and Y3 are connected to each other, so that "Y1-Y2-Y3-Y4" is realized in Figure 11 In addition, other flow state combinations are shown in the drawings, and the realization principles are the same as the above.

[0079] In one or more embodiments, the sector ring wedge block 620 is assembled with the sector ring rib plate 613 through a sliding groove, and the sector ring rib plate 613 is provided with a corresponding sliding block 618. The sector ring wedge block 620 can be assembled into the wedge block groove 611 in the form of interference through the sliding structure by means of tools, so that the sector ring wedge block 620 can be tightly assembled, and the necessary sealing effect can be provided.

[0080] In one or more embodiments, the annular support 610 is made of sealing rubber material, and a wear-resistant sealing washer 630 is further arranged between the annular support 610 and the hollow shaft 200. The flat end surface of the wear-resistant sealing washer 630 is tightly matched with the annular pressure regulating cavity 150, and the outer ring end surface of the wear-resistant sealing washer 630 is tightly matched with the annular support 610, so as to enhance the sealing effect of the overall structure and avoid medium leakage.

[0081] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A multifunctional rotary joint comprising a coaxially arranged valve housing and hollow shaft, wherein the valve housing has an access end for the hollow shaft to pass through, the ends of the hollow shaft and the access end of the valve housing being axially fixed by flanges, and a sealing lip and a bearing being provided between the access end and the hollow shaft, characterized in that: The valve housing includes an inner connecting cavity, an outer shell, and a hollow cavity formed by a shell body. The valve housing also includes at least four fluid interfaces that pass through the outer shell and the hollow cavity and directly connect to the inner connecting cavity. The four fluid interfaces are respectively a first fluid interface, a second fluid interface, a third fluid interface, and a fourth fluid interface. The valve housing also includes at least two coolant connectors that pass through the outer shell and connect to the hollow cavity. The hollow shaft has a main flow channel extending along its axis, and a first flow channel, a second flow channel, a third flow channel, and a fourth flow channel distributed circumferentially along its axis and corresponding to the first fluid interface, the second fluid interface, the third fluid interface, and the fourth fluid interface in sequence; A spiral partition is provided in the hollow cavity with the central axis direction of the hollow shaft as the axial direction, and the spiral partition divides the hollow cavity into a spiral flow channel, and the coolant joint includes a liquid injection joint and a liquid outlet joint; Among the first fluid interface, the second fluid interface, the third fluid interface, and the fourth fluid interface, adjacent fluid interfaces are opposite to each other with respect to the valve housing axis and are staggered in the axial direction, and the spaced fluid interfaces have parallel central axes, and the parallel central axes are coplanar with the central axis of the valve housing; The valve housing is provided with an annular pressure regulating chamber coaxially arranged with the hollow shaft between the second fluid interface and the third fluid interface. A pressure regulating ring is provided in the annular pressure regulating chamber. The pressure regulating ring includes a pair of annular brackets and a sector ring wedge. The annular bracket is provided with four fan-shaped wedge grooves evenly distributed along the circumferential direction, and the annular bracket has connecting portions between adjacent wedge grooves. The annular bracket has fan-shaped ribs forming the wedge grooves between the connecting portions. The fan-shaped wedges are used to be embedded in the wedge grooves and form a smooth annular structure with the annular bracket. The fan ring wedge is provided with a fan ring flow channel coaxial with the annular bracket on its end surface, and the fan ring wedge is divided into a full-pass fan ring wedge, a forward-pass fan ring wedge, and a reverse-pass fan ring wedge based on whether both ends of the fan ring flow channel penetrate the side surface of the fan ring wedge, one end penetrates the side surface of the fan ring wedge in the clockwise direction, and one end penetrates the side surface of the fan ring wedge in the counterclockwise direction. The communication portion is provided with a communication flow channel which is equal in width to and coaxial with the fan ring flow channel; The fan ring ribs of the pair of annular brackets are opposed to each other and pressed tightly together and are embedded in the pressing end faces to form the pressure stabilizing and adjusting ring; The valve housing is provided with a pressure stabilizing flow channel connected to the annular pressure stabilizing regulating cavity along the axial direction of the valve housing by a first fluid interface, a second fluid interface, a third fluid interface and a fourth fluid interface.

2. The multifunctional rotary joint according to claim 1, characterized in that: The valve housing is further provided with a fifth fluid interface and a sixth fluid interface. Correspondingly, the hollow shaft also has a fifth flow channel and a sixth flow channel corresponding to the fifth fluid interface and the sixth fluid interface.

3. The multifunctional rotary joint according to claim 1, characterized in that: One of the annular brackets is provided with an engaging column on the abutting end surface which is symmetrical about the center axis thereof, and the other annular bracket is provided with an engaging groove corresponding to the engaging column.

4. The multifunctional rotary joint according to claim 3, characterized in that: Each of the annular brackets has a connecting portion with a through hole, and through the relative rotation between a pair of annular brackets, when the connecting portions with the through holes of a pair of annular brackets correspond to each other, the two through holes are connected to each other, and when the connecting portions with the through holes of a pair of annular brackets are misaligned, the two through holes are closed by pressing against the end faces.

5. The multifunctional rotary joint according to claim 1, characterized in that: The fan ring wedge is slidably assembled with the fan ring rib through a sliding groove.

6. The multifunctional rotary joint according to claim 1, characterized in that: The annular bracket is made of sealing rubber material, and a wear-resistant sealing gasket is provided between the annular bracket and the hollow shaft.

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