Multi-stage series sealing structure and rotary joint

Abstract

The utility model relates to the technical field of rotary sealing, in particular to a multi-stage series-connection sealing structure and a rotary joint, the multi-stage series-connection sealing structure is used for sealing a first part and a second part which can rotate relatively in the circumferential direction, and an annular sealing space is formed between the first part and the second part; the multi-stage series sealing structure is arranged in the sealing space, the multi-stage series sealing structure comprises a first sealing assembly and a second sealing assembly, the first sealing assembly is connected with the first component, and a gap is reserved between the first sealing assembly and the second component; the second sealing assembly is connected with the second component, a gap is reserved between the second sealing ring assembly and the first component, the second sealing assembly and the first sealing assembly are sequentially arranged in the axial direction of the sealing space, and the end of the second sealing assembly is attached to the end of the first sealing assembly in a sealed mode. The multi-stage series sealing structure provided by the utility model can ensure the sealing effect, and is simple in structure and convenient to maintain.

Description

Technical Field

[0001] This utility model relates to the field of rotary sealing technology, and in particular to a multi-stage series sealing structure and rotary joint. Background Technology

[0002] In existing technologies, sealing methods for high-speed rotation conditions typically include two types: gap seals and mechanical seals. A gap seal involves a certain gap between the rotating shaft of the rotary joint and the mating hole on the outer shell, utilizing the principle of gap throttling to achieve liquid or gas transfer. Gap seals are non-contact seals, and thanks to this characteristic, they generate little heat. However, they require high cleanliness of the transported medium and high precision in the machining of key components. Furthermore, this method cannot achieve absolute sealing, making it unsuitable for applications requiring mixed transport. Common mechanical seals rely on a pair of tightly fitting end faces, with a pressure compensation mechanism to achieve fluid sealing. This type of mechanical seal requires compensation for wear of the sealing ring during use, resulting in a larger and more complex structure. This makes it difficult to apply in space-constrained rotary joints, and maintenance is also challenging after the sealing ring wears out. Utility Model Content

[0003] This utility model provides a multi-stage series sealing structure and a rotary joint. The multi-stage series sealing structure can ensure the sealing effect, while the structure is simple and easy to maintain.

[0004] In a first aspect, this utility model provides a multi-stage series sealing structure for sealing a first component and a second component that can rotate relative to each other in the circumferential direction, forming an annular sealing space between the first component and the second component; the multi-stage series sealing structure is disposed within the sealing space, and includes: a first sealing component connected to the first component, with a gap between the first sealing component and the second component; and a second sealing component connected to the second component, with a gap between the second sealing component and the first component, the second sealing component and the first sealing component being arranged sequentially along the axial direction of the sealing space, and the end of the second sealing component being sealed and fitted to the end of the first sealing component.

[0005] In one possible implementation, the first sealing assembly includes a first sealing ring and a first sealing ring, the first sealing ring being disposed on the side of the first sealing ring facing the first component and abutting against the surface of the first component; and / or the second sealing assembly includes a second sealing ring and a second sealing ring, the second sealing ring being disposed on the side of the second sealing ring facing the second component and abutting against the surface of the second component.

[0006] In one possible implementation, the first sealing ring has a first sealing surface at its axial end, and the second sealing ring has a second sealing surface at its axial end, with the first sealing surface and the second sealing surface sealingly fitted together.

[0007] In one possible implementation, the first component is sleeved on the outer periphery of the second component; the surface of the first sealing ring facing the first component is provided with a first mounting groove, and the first sealing ring is disposed in the first mounting groove; and / or the surface of the second component facing the second sealing ring is provided with a second mounting groove, and the second sealing ring is disposed in the second mounting groove.

[0008] In one possible implementation, at least one first sealing component and at least one second sealing component are provided, with at least one first sealing component and at least one second sealing component spaced apart axially along the sealing space.

[0009] In one possible implementation, the multi-stage tandem sealing structure further includes an elastic support member disposed within the sealing space, the elastic support member abutting against the first sealing assembly or the second sealing assembly to maintain an end-sealed fit between the first sealing assembly and the second sealing assembly.

[0010] In one possible implementation, a first flow channel is provided on a first component, a second flow channel is provided on a second component, and a second sealing ring is provided with a connecting hole in the radial direction, wherein the first flow channel and the second flow channel are connected through the connecting hole.

[0011] In one possible implementation, the second sealing ring is provided with two second sealing rings, which are respectively disposed on both sides of the connecting hole.

[0012] In one possible implementation, the number of the first sealing components is one more than the number of the second sealing components.

[0013] Secondly, this utility model provides a rotary joint, including: a first component and a second component that can rotate relative to each other in the circumferential direction, with a sealing space formed between the first component and the second component; and the above-mentioned multi-stage series sealing structure.

[0014] The multi-stage series sealing structure and rotary joint provided by this utility model have a first sealing component and a second sealing component arranged in a sealing space between a first component and a second component that can rotate relative to each other. The first sealing component is connected to the first component and has a gap between it and the second component so that the first sealing component can rotate with the first component relative to the second component. The second sealing component is connected to the second component and has a gap between it and the first component so that the second sealing component can rotate with the second component relative to the first component. The sealing effect is guaranteed by the sealing fit between the ends of the first sealing component and the ends of the second sealing component. The structure is simple and easy to maintain. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a cross-sectional structural diagram of a multi-stage series sealing structure and a first and second component provided by this utility model.

[0017] Figure 2 yes Figure 1 A magnified schematic diagram of the structure at point A.

[0018] Figure 3 yes Figure 1 A schematic diagram of the structure after removing the multi-stage series sealing structure.

[0019] Figure 4 This is a three-dimensional structural diagram of an end cap and an elastic support provided by this utility model;

[0020] Figure 5 This is a three-dimensional structural diagram of a second sealing ring provided by this utility model.

[0021] Figure label:

[0022] 1. First sealing assembly; 11. First sealing ring; 111. First mounting groove; 12. First sealing ring;

[0023] 2. Second sealing assembly; 21. Second sealing ring; 211. Communicating hole; 22. Second sealing ring;

[0024] 3. Elastic support components;

[0025] 4. First component; 41. First flow channel; 411. First annular groove; 412. First conveying groove; 42. Limiting structure;

[0026] 5. Second component; 51. Second mounting groove; 52. Second flow channel; 521. Second annular groove; 522. Second conveying groove;

[0027] 6. Sealed space;

[0028] 7. First bearing; 8. Second bearing;

[0029] 9. End cap; 91. Fixing groove. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0031] The following is combined Figures 1-5 This invention provides a multi-stage tandem sealing structure for sealing a first component 4 and a second component 5 that can rotate relative to each other in the circumferential direction. An annular sealing space 6 is formed between the first component 4 and the second component 5. The multi-stage tandem sealing structure is disposed within the sealing space 6 and includes: a first sealing assembly 1 and a second sealing assembly 2; wherein:

[0032] The first sealing assembly 1 is connected to the first component 4, and a gap is left between the first sealing assembly 1 and the second component 5.

[0033] The second sealing component 2 is connected to the second component 5. There is a gap between the second sealing component 2 and the first component 4. The second sealing component 2 and the first sealing component 1 are arranged sequentially along the axial direction of the sealing space 6, and the end of the second sealing component 2 is sealed and fitted with the end of the first sealing component 1.

[0034] In this invention, a first sealing component 1 and a second sealing component 2 are provided in the sealing space 6 between the first component 4 and the second component 5, which are rotatable relative to each other. The first sealing component 1 is connected to the first component 4 and has a gap between it and the second component 5, so that the first sealing component 1 can rotate with the first component 4 relative to the second component 5. The second sealing component 2 is connected to the second component 5 and has a gap between it and the first component 4, so that the second sealing component 2 can rotate with the second component 5 relative to the first component 4. The sealing effect is guaranteed by the sealing fit between the end of the first sealing component 1 and the end of the second sealing component 2. The structure is simple and easy to maintain.

[0035] Specifically, such as Figure 3As shown, the first component 4 and the second component 5 are coaxially arranged. The first component 4 is a cylinder, and the second component 5 is a rotating shaft. At least a portion of the rotating shaft is located inside the cylinder and is rotatably connected to the cylinder, forming an annular sealed space 6 between the cylinder and the rotating shaft. The sealed space 6 is sealed by the multi-stage series sealing structure of this invention. Optionally, the first component 4 can also be an outer rotating shaft, and the second component 5 can be an inner rotating shaft. The outer rotating shaft has a rotating groove along its axial direction in its middle part, and at least a portion of the inner rotating shaft is located within the rotating groove of the outer rotating shaft, forming an annular sealed space 6 between the inner rotating shaft and the rotating groove. The sealed space 6 is sealed by the multi-stage series sealing structure of this invention.

[0036] In related technologies, sealing methods for high-speed rotation conditions typically include two types: gap seals and mechanical seals. A gap seal involves a certain gap between the rotating shaft of the rotary joint and the mating hole on the outer shell, using the principle of gap throttling to achieve liquid or gas transfer. Gap seals are non-contact seals, and thanks to this characteristic, they generate little heat. However, they have high requirements for the cleanliness of the transported medium and the machining precision of key components. Furthermore, this method cannot achieve absolute sealing, making it unsuitable for applications requiring mixed transport. Common mechanical seals rely on a pair of tightly fitting end faces, with a pressure compensation mechanism to achieve fluid sealing. However, mechanical seals require compensation for wear of the sealing rings during use, resulting in a large and complex structure. This makes them difficult to apply in space-constrained rotary joints, and maintenance is challenging after the sealing rings wear down. In addition, some methods have been developed to improve the sealing ring materials for high-speed rotation conditions, but these sealing rings are very expensive and unsuitable for large-scale applications.

[0037] In this embodiment of the invention, within the sealing space 6 formed between the first sealing component 4 and the second component 5, the first sealing component 1 is connected to the first component 4 and forms a gap with the second component 5, allowing the first sealing component 1 to rotate relative to the second component 5 with the first component 4. This connection ensures a tight seal between the first sealing component 1 and the first component 4. The first sealing component 1 and the first component 4 can be connected by abutment or by adhesive bonding. Similarly, the second sealing component 2 is connected to the second component 5 and forms a gap with the first component 4, allowing the second sealing component 2 to rotate relative to the first component 4 with the second component 5. This connection also ensures a tight seal between the second sealing component 2 and the second component 5. The second sealing component 2 and the second component 5 can be connected by abutment or by adhesive bonding. The end of the first sealing component 1 is sealed and fitted with the end of the second sealing component 2, which can not only ensure that the first sealing component 1 and the second sealing component 2 can rotate relative to each other, but also effectively seal the first sealing component 1 and the second sealing component 2. Together with the sealing between the first sealing component 1 and the first component 4, and the sealing between the second sealing component 2 and the second component 5, it ensures an effective seal between the first component 4 and the second component 5. The structure is simple, the cost is low, and it is convenient for later maintenance.

[0038] Specifically, the first sealing component 1 and the second sealing component 2 in this utility model can be a single sealing ring structure, a multi-stage series sealing structure of composite materials, or a combination structure of sealing ring and sealing ring.

[0039] In this invention, the sealing and bonding of the ends of the first sealing component 1 and the second sealing component 2 can include: planar bonding, conical bonding, spherical bonding, etc. Planar bonding is simple to process but requires high coaxiality; conical bonding has a self-centering effect but is difficult to process; spherical bonding has good adaptability but is costly. In this invention, the form of end-face sealing and bonding of the first sealing component 1 and the second sealing component 2 can be selected as needed. In a preferred embodiment, the end-face sealing and bonding of the first sealing component 1 and the second sealing component 2 in this invention is planar bonding.

[0040] like Figure 2 As shown, in some embodiments, the first sealing assembly 1 includes a first sealing ring 11 and a first sealing ring 12, the first sealing ring 12 being disposed on the side of the first sealing ring 11 facing the first component 4 and abutting against the surface of the first component 4; and / or the second sealing assembly 2 includes a second sealing ring 21 and a second sealing ring 22, the second sealing ring 22 being disposed on the side of the second sealing ring 21 facing the second component 5 and abutting against the surface of the second component 5.

[0041] In this invention, the first sealing ring 12 is connected to the first sealing ring 11 and abuts against the surface of the first component 4, and the second sealing ring 22 is connected to the second sealing ring 21 and abuts against the surface of the second component 5. A composite structure of "sealing ring + sealing ring" is adopted. Radial sealing is achieved through the first sealing ring 12 and the second sealing ring 22, and structural support and axial sealing are provided through the first sealing ring 11 and the second sealing ring 21. The double sealing further improves reliability.

[0042] Specifically, the first sealing ring 11 and the second sealing ring 21 are made of ceramic rings, which have good wear resistance and can work for a long time under high-speed rotation conditions, ensuring high reliability. The sealing is achieved through the end face of the ceramic rings, making it suitable not only for the transportation of gas but also for the transportation of fluids such as water and hydraulic oil, thus having a wide range of applications.

[0043] Specifically, the multi-stage series sealing structure provided by this utility model can effectively ensure the sealing effect when dealing with high-speed rotation conditions, applications requiring high sealing levels, conditions with radial runout, and environments with large pressure fluctuations.

[0044] Moreover, the first sealing ring 11 forms effective friction with the first component 4 through the compression force of the first sealing ring 12, thereby allowing the first sealing assembly 1 to rotate with the first component 4; the second sealing ring 21 forms effective friction with the second component 5 through the compression force of the second sealing ring 22, thereby allowing the second sealing assembly 2 to rotate with the second component 5. The limiting structure is eliminated. The first sealing ring 12 and the second sealing ring 22 not only play the role of axial sealing, but also play the role of fixing the first sealing assembly 1 and the second sealing assembly 2.

[0045] In some embodiments, the first sealing ring 11 is provided with a first sealing surface at its axial end, and the second sealing ring 21 is provided with a second sealing surface at its axial end, wherein the first sealing surface and the second sealing surface are sealed and fitted together.

[0046] In this invention, a first sealing surface is provided on the end face of the first sealing ring 11, and a second sealing surface is provided on the end face of the second sealing ring 21. The sealing fit is achieved through the first and second sealing surfaces. This ensures an axial sealing effect, allows for precise control of the contact area and pressure, and facilitates processing and maintenance.

[0047] Specifically, the first and second sealing surfaces can be flat, conical, stepped, spherical, or concave surfaces. Among these, flat surfaces are easy to machine but require high coaxiality, conical surfaces have a guiding function but are difficult to machine, and stepped surfaces can control contact pressure but have a complex structure.

[0048] Preferably, both the first sealing surface and the second sealing surface in this utility model are planar, which facilitates processing. The first sealing ring 11 is radially positioned with the first component 4 through the first sealing ring 12, and the second sealing ring 21 is radially positioned with the second component 5 through the second sealing ring 22, thereby ensuring the coaxiality of the first sealing ring 11 and the second sealing ring 21.

[0049] like Figure 2 As shown, in some embodiments, the first component 4 is sleeved on the outer periphery of the second component 5; the surface of the first sealing ring 11 facing the first component 4 is provided with a first mounting groove 111, and the first sealing ring 12 is disposed in the first mounting groove 111; and / or the surface of the second component 5 facing the second sealing ring 21 is provided with a second mounting groove 51, and the second sealing ring 22 is disposed in the second mounting groove 51.

[0050] In this invention, the first sealing ring 12 is fixed by the first mounting groove 111, and the second sealing ring 22 is fixed by the second mounting groove 51, thereby effectively fixing the first sealing ring 12 and the second sealing ring 22, limiting their deformation, and further ensuring the sealing performance between the first sealing assembly 1 and the first component 4, as well as between the second sealing assembly 2 and the second component 5. It also facilitates the replacement of the first sealing ring 12 and the second sealing ring 22.

[0051] Specifically, a first mounting groove 111 is disposed on the outer peripheral surface of the first sealing ring 11, and a first sealing ring 12 is fixed inside the first mounting groove 111. The outer peripheral surface of the first sealing ring 12 abuts against the inner surface of the first component 4, thereby achieving a seal between the first sealing assembly 1 and the first component 4, while ensuring that the first sealing assembly 1 can rotate with the first component 4. A second mounting groove 51 is disposed on the inner surface of the second component 5, and a second sealing ring 22 is fixed inside the second mounting groove 51. The outer peripheral surface of the second sealing ring abuts against the inner peripheral surface of the second sealing ring, thereby achieving a seal between the second sealing assembly 2 and the second component 5, while ensuring that the second sealing assembly 2 can rotate with the second component 5. The mounting groove can be a rectangular groove, a dovetail groove, a stepped groove, etc.

[0052] In this invention, a first mounting groove 111 is provided on the outer peripheral surface of the first sealing ring 11, and a second mounting groove 51 is provided on the outer peripheral surface of the second component 5. After separating the first component 4 and the second component 5, the first sealing ring 12 and the second sealing ring 22 are exposed, making it convenient for replacement.

[0053] In some embodiments, at least one first sealing component 1 and at least one second sealing component 2 are provided, and at least one first sealing component 1 and at least one second sealing component 2 are spaced apart along the axial direction of the sealing space 6.

[0054] In this invention, the first sealing component 1 and the second sealing component 2 are alternately arranged along the axial direction to form multiple sealing barriers, thereby forming a multi-level seal and multiple independent sealing channels, which improves the overall sealing reliability and facilitates adaptation to different pressure level requirements.

[0055] Specifically, the number of the first sealing component 1 and the second sealing component 2 can be selected according to the sealing requirements of the rotary joint. For working conditions with high sealing requirements or high rotation speed, the number of the first sealing component 1 and the second sealing component 2 can be appropriately increased.

[0056] Optionally, the spacing between the first sealing component 1 and the second sealing component 2 can be equal, variable, or segmented. The spacing between the first sealing component 1 and the second sealing component 2 can be set according to actual needs.

[0057] The axial length of the first sealing component 1 can be equal to or different from the axial length of the second sealing component 2.

[0058] In some embodiments, the multi-stage tandem sealing structure further includes an elastic support 3 disposed within the sealing space 6, the elastic support 3 abutting against the first sealing component 1 or the second sealing component 2, so that the first sealing component 1 and the second sealing component 2 maintain an end-sealed fit.

[0059] In this invention, the first sealing component 1 or the second sealing component 2 is elastically supported axially by the elastic support member 3, ensuring that the end face of the first sealing component 1 and the end face of the second sealing component 2 always remain in contact, compensating for installation and usage errors, and adapting to changes in the working environment.

[0060] The elastic support 3 can be a spring, wave spring, rubber ring, etc. Specifically, in order to improve the reliability of use, the elastic support 3 in this utility model is a plurality of springs. The plurality of springs are arranged at one end of the sealing space 6 to apply elastic pressure to the first sealing component 1 and the second sealing component 2 along the axial direction, thereby ensuring the sealing fit between the first sealing component and the second sealing component 2.

[0061] In a specific embodiment, the elastic support 3 is provided in a set, which is located at one end inside the sealed space 6. One end of the combination of multiple first sealing components 1 and multiple second sealing components 2 abuts against the elastic support 3, and the other end abuts against the inner sidewall of the sealed space 6. This not only ensures the sealing and fitting effect between the ends of the first sealing components 1 and the second sealing components 2, but also positions the first sealing components 1 and the second sealing components 2 within the sealed space 6.

[0062] Optionally, the elastic support 3 can also be disposed at a certain position in the middle of the plurality of first sealing components 1 and the plurality of second sealing components 2, and apply axial elastic pressure to the first sealing components 1 and the second sealing components 2 from the middle to both ends.

[0063] In some embodiments, the first component 4 is provided with a first flow channel 41, the second component 5 is provided with a second flow channel 52, and the second sealing ring 21 is provided with a connecting hole 211 in the radial direction. The first flow channel 41 and the second flow channel 52 are connected through the connecting hole 211.

[0064] In this invention, the first flow channel 41 is connected to the second flow channel 52 through the connecting hole 211, so as to realize the directional transmission of the medium between the first component 4 and the second component 5, ensure the sealing of the transmission process, and have a compact structure and high integration, making it easy to control the flow direction of the medium.

[0065] Among them, the first flow channel 41 and the second flow channel 52 can be straight holes, stepped holes, irregular holes, etc.

[0066] like Figure 2 , 5 As shown, in a specific embodiment, the first flow channel 41 includes a first annular groove 411 disposed on the inner surface of the first component 4 and a first conveying groove 412 communicating with the first annular groove 411. The second flow channel 52 includes a second annular groove 521 disposed on the outer surface of the second component 5 and a second conveying groove 522 communicating with the second annular groove 521. Multiple connecting holes 211 are provided along the circumference of the second sealing ring 21. One end of each connecting hole 211 communicates with the first annular groove 411, and the other end communicates with the second annular groove 521, thereby achieving reliable communication between the first flow channel 41 and the second flow channel 52. The medium can enter the first annular groove 411 through the first conveying groove 412, then enter the second annular groove 521 through the connecting holes 211, and exit through the second conveying groove 522; the medium can also enter the second annular groove 521 through the second conveying groove 522, then enter the first annular groove 411 through the connecting holes 211, and exit through the first conveying groove 412.

[0067] In some embodiments, the second sealing ring 21 is provided with two second sealing rings 22, which are respectively disposed on both sides of the connecting hole 211.

[0068] In this invention, two second sealing rings 22 are provided on the second sealing ring 21, with the two second sealing rings 22 located on both sides of the connecting hole 211. This double-sided sealing improves reliability, prevents leakage at the connecting hole 211, and enables directional flow of the medium, further enhancing the sealing effect. It can effectively address situations requiring medium transmission, operating conditions with large pressure differentials, and applications requiring high cleanliness.

[0069] Specifically, the two second sealing rings 22 on the second sealing ring 21 are located on both sides of the second annular groove 521, preventing the medium in the second annular groove 521 from leaking out through the gap between the second sealing ring 21 and the second component 5. A gap is formed between the second sealing ring 21 and the first component 4, and the gap is sealed at both ends along the axial direction by the first sealing ring 12 to prevent the medium in the gap from leaking out through the gap between the first component 4 and the first sealing ring 11.

[0070] Optionally, there may be multiple second sealing rings 22, that is, at least one second sealing ring 22 may be provided on one side of the connecting hole 211.

[0071] In some embodiments, the number of first sealing components 1 is one more than the number of second sealing components 2.

[0072] In this invention, since the connecting hole 211 is provided on the second sealing ring 21, by having one more first sealing component 1 than second sealing component 2, both ends of the combination of the first sealing component 1 and the second sealing component 2 are the first sealing component 1, thereby effectively sealing the gap between the second sealing ring 21 and the first component 4 and improving the sealing reliability.

[0073] Specifically, the present invention can select the number of the first sealing component 1 and the second sealing component 2 according to the flow channel arrangement. It has a compact structure and high expandability. When it is necessary to change the fluid passage, it is only necessary to change the number of the first sealing component 1 and the second sealing component 2 in pairs, adjust the elasticity of the elastic support 3 and change the length of other parts (sealing space 6) accordingly. No additional auxiliary parts are required, so it will not cause the product volume to increase by a factor of two.

[0074] In one specific embodiment, the present invention has five first sealing components 1 and four second sealing components 2. The first component 4 has four first flow channels 41, and the second component 5 has four second flow channels 52. The four first flow channels 41 are connected to the four second flow channels 52 through four connecting holes 211. When it is necessary to change to three flow channels, one of the second sealing rings 21 with connecting holes 211 is replaced with a second sealing ring 21 without connecting holes 211. Similarly, when it is necessary to change to two flow channels, one of the second sealing rings 21 with connecting holes 211 is replaced with a second sealing ring 21 without connecting holes 211.

[0075] In another specific embodiment, for the case of four first flow channels 41 and four second flow channels 52, five first sealing components 1 and four second sealing components 2 can be spaced apart and installed into the sealing space 6 to achieve communication between the four first flow channels 41 and the four second flow channels 52. For the case of three first flow channels 41 and three second flow channels 52, four first sealing components 1 and three second sealing components 2 can be spaced apart and installed into the sealing space 6 to achieve communication between the three first flow channels 41 and the three second flow channels 52.

[0076] This multi-stage tandem sealing structure uses a first sealing component 1 and a second sealing component 2 arranged in a sealing space 6 between a first component 4 and a second component 5 that can rotate relative to each other. The first sealing component 1 is connected to the first component 4 and has a gap between it and the second component 5, so that the first sealing component 1 can rotate with the first component 4 relative to the second component 5. The second sealing component 2 is connected to the second component 5 and has a gap between it and the first component 4, so that the second sealing component 2 can rotate with the second component 5 relative to the first component 4. The sealing effect is guaranteed by the sealing fit between the end of the first sealing component 1 and the end of the second sealing component 2. The structure is simple and easy to maintain.

[0077] The sealing structure is achieved by a first sealing component 1 and a second sealing component 2 arranged in series. The structure is simple and convenient for maintenance. When one of the first sealing components 1 or the second sealing component 2 is damaged, it can be replaced simply by taking out the damaged first sealing component 1 or the second sealing component 2 in sequence.

[0078] This utility model provides a rotary joint, including: a first component 4 and a second component 5 that can rotate relative to each other in the circumferential direction, with a sealing space 6 formed between the first component 4 and the second component 5; and the above-mentioned multi-stage series sealing structure.

[0079] like Figure 1 and 3 As shown, specifically, the rotary joint in this utility model also includes a bearing assembly, and the first component 4 and the second component 5 are rotatably connected through the bearing assembly. The bearing assembly includes a first bearing 7 and a second bearing 8, which are spaced apart along the axial direction of the rotary joint and located at both ends of the sealed space 6, respectively, to ensure the reliability of the relative rotation of the first component 4 and the second component 5.

[0080] Furthermore, the rotary joint in this invention also includes an end cap 9, which is sleeved on the outer periphery of the second component 5 and connected to one end of the first component 4. The second bearing 8 is disposed between the end cap 9 and the second component 5. The end cap 9 effectively seals the sealing space 6, facilitating the removal and placement of the first sealing assembly 1 and the second sealing assembly 2 from the opening at one end of the end cap 9 of the first component 4. Moreover, the end cap 9 serves as the supporting base for the elastic support member 3, such as… Figure 4 As shown, the end cap 9 is provided with a fixing groove 91 for fixing the elastic support 3. Multiple elastic support 3 are fixed in multiple fixing grooves 91 respectively, ensuring the uniformity of the distribution of the elastic support 3 along the circumference and ensuring the stability of the elastic support 3, so as to avoid the elastic support 3 tilting and deforming when the first component 4 and the second component 5 rotate relative to each other.

[0081] like Figure 1 and 3 As shown, specifically, the end cap 9 abuts against the end of the first component 4, so that the end cap 9 can rotate with the first component 4. The end of the elastic support 3 away from the end cap 9 abuts against the first sealing assembly 1. The first sealing assembly 1 also rotates with the first component 4, so that there is no relative rotation between the first sealing assembly 1 and the elastic support 3, thereby protecting the elastic support 3.

[0082] Multiple first sealing components 1 and multiple second sealing components 2 are connected in series and spaced apart, and are sealed to each other by end face. An elastic support 3 is provided at one end for compensation, and the other end is limited by the limiting structure 42 on the first component 4.

[0083] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A multi-stage series sealing structure for sealing a first component (4) and a second component (5) that can rotate relative to each other in the circumferential direction, wherein an annular sealing space (6) is formed between the first component (4) and the second component (5); Its features are, The multi-stage series sealing structure is disposed within the sealing space (6), and the multi-stage series sealing structure includes: A first sealing assembly (1) is connected to the first component (4), and a gap is left between the first sealing assembly (1) and the second component (5); And a second sealing component (2) is connected to the second component (5). There is a gap between the second sealing component (2) and the first component (4). The second sealing component (2) and the first sealing component (1) are arranged sequentially along the axial direction of the sealing space (6), and the end of the second sealing component (2) is sealed and fitted with the end of the first sealing component (1).

2. The multi-stage series sealing structure according to claim 1, characterized in that, The first sealing assembly (1) includes a first sealing ring (11) and a first sealing ring (12). The first sealing ring (12) is disposed on the side of the first sealing ring (11) facing the first component (4) and abuts against the surface of the first component (4). And / or, the second sealing assembly (2) includes a second sealing ring (21) and a second sealing ring (22), the second sealing ring (22) being disposed on the side of the second sealing ring (21) facing the second component (5) and abutting against the surface of the second component (5).

3. The multi-stage series sealing structure according to claim 2, characterized in that, The first sealing ring (11) has a first sealing surface at its axial end, and the second sealing ring (21) has a second sealing surface at its axial end. The first sealing surface and the second sealing surface are sealed and fitted together.

4. The multi-stage series sealing structure according to claim 2, characterized in that, The first component (4) is sleeved on the outer periphery of the second component (5); The first sealing ring (11) has a first mounting groove (111) on its surface facing the first component (4), and the first sealing ring (12) is disposed in the first mounting groove (111); And / or, the surface of the second component (5) facing the second sealing ring (21) is disposed in the second mounting groove (51), and the second sealing ring (22) is disposed in the second mounting groove (51).

5. The multi-stage series sealing structure according to claim 1, characterized in that, At least one first sealing component (1) and at least one second sealing component (2) are provided, and at least one first sealing component (1) and at least one second sealing component (2) are spaced apart along the axial direction of the sealing space (6).

6. The multi-stage series sealing structure according to claim 1, characterized in that, The multi-stage series sealing structure also includes an elastic support member (3) disposed in the sealing space (6), the elastic support member (3) abutting against the first sealing component (1) or the second sealing component (2) so that the first sealing component (1) and the second sealing component (2) maintain end sealing fit.

7. The multi-stage tandem sealing structure according to any one of claims 2-4, characterized in that, The first component (4) is provided with a first flow channel (41), the second component (5) is provided with a second flow channel (52), and the second sealing ring (21) is provided with a connecting hole (211) in the radial direction. The first flow channel (41) and the second flow channel (52) are connected through the connecting hole (211).

8. The multi-stage series sealing structure according to claim 7, characterized in that, The second sealing ring (21) is provided with two second sealing rings (22), which are respectively disposed on both sides of the connecting hole (211).

9. The multi-stage tandem sealing structure according to claim 7, characterized in that, The number of the first sealing component (1) is one more than the number of the second sealing component (2).

10. A rotary joint, characterized in that, include: A first component (4) and a second component (5) are rotatable relative to each other in the circumferential direction, and a sealed space (6) is formed between the first component (4) and the second component (5); And the multi-stage tandem sealing structure as described in any one of claims 1-9.

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