Sealing components and turbines

Abstract

The present invention relates to a sealing assembly and a water turbine, wherein the sealing assembly includes a first ring and a second ring; the first ring has a first annular groove, and the first annular groove is configured to be filled with lubricant; the second ring includes a ring body and annular teeth, and the ring body is spaced apart from the first ring along the axial or radial direction of the first ring; the annular teeth are connected to the surface of the ring body facing the first ring; the annular teeth are inserted into the first annular groove and are in clearance fit with the first annular groove. The present invention forms a labyrinth seal between a rotating main shaft and a stationary guide bearing oil tank by cooperating with the first annular groove and the annular teeth, and forms a low-friction contact seal between the first ring and the second ring that are in relative motion by filling the first annular groove with lubricant, thereby improving the sealing performance between the main shaft and the guide bearing oil tank. In this way, when the oil mist flows to the mating portion between the main shaft and the guide bearing oil tank, the oil mist is blocked by the lubricant, thereby effectively preventing the oil mist from escaping from the mating gap between the guide bearing oil tank and the main shaft.

Description

Technical Field

[0001] The present invention relates to the technical field of water turbines, and in particular to a sealing component and a water turbine. Background Art

[0002] A hydraulic turbine is a type of power machine that converts the energy of water into mechanical energy. Based on the direction of water flow, hydraulic turbines are primarily divided into mixed-flow pump-turbines and axial-flow pump-turbines. A pump-turbine is a type of mixed-flow pump-turbine. Its runner functions as a turbine when rotating in the forward direction and as a pump when rotating in the reverse direction. A pump-turbine includes a volute, a draft tube disposed at one end of the volute, a main shaft that rotates within the volute, a runner sleeved on the main shaft and located between the main shaft and the volute, and a plurality of guide vanes disposed between the volute and the runner. Water enters the volute, flows radially through the guide vanes into the runner, and within the runner, the water flow gradually turns axially before exiting through the draft tube. Water flows both radially and axially within the runner, driving the runner to rotate and, in turn, the main shaft.

[0003] To prevent excessive swing and vibration during turbine operation and ensure safe and stable operation, the main shaft is primarily supported by a guide bearing. The guide bearing consists of multiple segmented bearing shells arranged around the main shaft. To ensure lubrication between the guide bearing and the main shaft, a guide bearing oil tank is provided. This tank is mounted on the main shaft and encloses the guide bearing. The guide bearing oil tank contains lubricating oil, which provides both lubrication and cooling. The outer periphery of the guide bearing is connected to the inner wall of the tank, while the inner periphery contacts the outer surface of the main shaft. As the main shaft rotates, the contact surfaces of the main shaft and guide bearing move relative to each other, generating heat and vaporizing the lubricating oil to form oil mist. This oil mist dissipates within the guide bearing oil tank and undergoes centrifugal motion within the tank as the main shaft rotates at high speed. Centrifugal force propels the oil mist onto the inner wall of the tank and along the inner wall to the tank cover. The oil mist then flows back along the oil tank cover to the spindle surface, ultimately escaping through the clearance between the guide bearing oil tank and the spindle. The oil mist condenses into liquid and adheres to equipment surfaces, severely contaminating the unit and increasing maintenance difficulties. Furthermore, the oil mist can diffuse into the air, causing air pollution, degrading the work environment, and adversely affecting worker health. Summary of the Invention

[0004] The present invention provides a sealing assembly, which can improve the sealing performance between a main shaft and an oil tank cover plate and effectively prevent oil mist from overflowing from the gap.

[0005] In order to achieve the above-mentioned purpose, according to a first aspect of the present invention, a sealing assembly is provided, which includes a first ring and a second ring; the first ring has a first annular groove, which is arranged to extend axially around the first ring, and the first annular groove is configured to be filled with lubricant; the second ring includes a ring body and annular teeth, and the ring body is spaced apart from the first ring along the axial or radial direction of the first ring; the annular teeth are connected to the surface of the ring body facing the first ring, and the annular teeth are arranged to extend axially around the ring body; wherein the annular teeth are inserted into the first annular groove and are gap-fitted with the first annular groove.

[0006] Optionally, there are multiple first annular grooves and multiple annular teeth, and the multiple first annular grooves correspond one-to-one to the multiple annular teeth respectively.

[0007] Optionally, two adjacent annular teeth are spaced apart to define a second annular groove, and a first through hole is provided on the ring body, one end of the first through hole is connected to the second annular groove, and the other end is configured to be connected to the outside.

[0008] Optionally, the thicknesses of the plurality of annular teeth are equal, and / or the widths of the plurality of first annular grooves are equal.

[0009] Optionally, the first annular groove has a width dimension W1, and the annular tooth has a thickness dimension W2, satisfying: 1.2W2≤W1≤6W2.

[0010] Optionally, the ring body is spaced apart from the first ring along the axial direction of the first ring; wherein the outer peripheral surface of the outermost ring tooth is co-circumferentially arranged with the outer peripheral surface of the ring body, and / or the inner peripheral surface of the innermost ring tooth is co-circumferentially arranged with the inner peripheral surface of the ring body.

[0011] Optionally, the ring body is spaced apart from the first ring along the radial direction of the first ring, and the surface of the annular teeth at at least one end of the ring body facing away from the first annular groove is coplanar with the end face of the ring body adjacent thereto.

[0012] According to a second aspect of the present invention, a water turbine is provided, comprising a guide bearing oil tank, a main shaft, and the aforementioned sealing assembly; the guide bearing oil tank has an inner cavity and a matching through hole communicating with the inner cavity; the main shaft is disposed in the inner cavity, and one end of the main shaft extends through the matching through hole; one of the first ring and the second ring is connected to the guide bearing oil tank, and the other is sleeved on the main shaft; wherein a lubricant is provided in the first annular groove.

[0013] Optionally, the sealing assembly is arranged in the guide bearing oil tank, the first ring is sleeved on the main shaft, the second ring is connected to the guide bearing oil tank, a second through hole is provided on the guide bearing oil tank, and the second through hole is connected to the first through hole provided on the second ring.

[0014] Optionally, the turbine further includes a clamp, which is sleeved on the main shaft, and one of the first ring and the second ring connected to the main shaft is connected to the main shaft through the clamp.

[0015] In the seal assembly of the embodiment of the present invention, the first annular groove and the annular teeth cooperate to form a labyrinth seal between the rotating main shaft and the stationary guide bearing oil tank. Furthermore, by filling the first annular groove with lubricant, a low-friction contact seal is formed between the first and second rings, which move relative to each other, thereby improving the sealing performance between the main shaft and the guide bearing oil tank. As a result, when oil mist flows into the mating area between the main shaft and the guide bearing oil tank, it is blocked by the lubricant, effectively preventing the oil mist from escaping through the mating clearance between the guide bearing oil tank and the main shaft.

[0016] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0018] In order to more completely understand the present invention and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same reference numerals in the following description represent the same parts.

[0019] Figure 1 is a schematic diagram of the overall structure of a first sealing assembly provided in an exemplary embodiment of the present invention;

[0020] Figure 2 is a schematic diagram of the overall structure of a second sealing assembly provided in an exemplary embodiment of the present invention;

[0021] Figure 3 is a schematic diagram of the cooperation between a first sealing assembly and a main shaft and other components provided in an exemplary embodiment of the present invention;

[0022] Figure 4 is a schematic diagram of the cooperation between the second sealing assembly provided in an exemplary embodiment of the present invention and components such as a main shaft;

[0023] Figure 5 is a schematic diagram of a partial structure of a water turbine provided in an exemplary embodiment of the present invention;

[0024] Figure 6 yes Figure 5 Enlarged schematic diagram of point A in the middle.

[0025] Description of reference numerals:

[0026] 1-seal assembly; 11-first ring; 111-first annular groove;

[0027] 12-second ring; 121-ring body; 122-annular teeth; 123-second annular groove; 124-first through hole;

[0028] 2-turbine; 21-guide bearing oil tank; 211-matching through hole; 212-housing; 213-cover plate; 214-base plate; 215-second through hole; 22-main shaft; 23-small gap sealing ring; 24-hoop. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0030] Before introducing a sealing assembly and a water turbine provided by an embodiment of the present invention, the related technologies of the present invention are first introduced.

[0031] In the related art, a small-gap sealing ring is used to seal between the guide bearing oil tank and the main shaft of the water pump turbine. The small-gap sealing ring is installed on the guide bearing oil tank, and there is a fitting gap between it and the main shaft. As a result, the oil mist protection of the water pump turbine guide is limited. During use, the oil mist generated in the oil tank will leak out of the guide bearing oil tank through the fitting gap, causing pollution to the water pump turbine and the equipment located around the water pump turbine. If a contact sealing block is set at the fitting point between the guide bearing oil tank and the main shaft, the sealing block will gradually wear out and lose its sealing effect as the use time increases. Therefore, the sealing block needs to be replaced frequently, and the maintenance cost is high. In addition, due to the large amount of oil stains attached to the sealing block, the replacement of the sealing block is very laborious and time-consuming, and the maintenance efficiency is low.

[0032] Furthermore, because the guide bearing oil tank is a non-rotating component while the main shaft is a rotating component during operation, a rigid connection between the guide bearing oil tank and the main shaft is not possible, resulting in a clearance between the two. Therefore, a sealing structure tailored to the specific operating conditions of the pump-turbine is required to achieve the desired oil mist prevention effect.

[0033] Based on this, an embodiment of the present invention provides a sealing assembly and a water turbine to effectively solve the sealing problem between rotating parts and non-rotating parts, thereby preventing oil mist from escaping from the fitting gap between the main shaft and the guide bearing oil tank.

[0034] The following, combined Figures 1 to 6 , a sealing assembly 1 and a turbine 2 provided in an embodiment of the present invention are described in detail.

[0035] According to a first aspect of the present invention, the present invention provides a sealing assembly 1, see Figure 1 or Figure 2 , Figure 1 is a schematic diagram of the overall structure of a first sealing assembly 1 provided in an exemplary embodiment of the present invention, Figure 2 It is a schematic diagram of the overall structure of the second sealing assembly 1 provided in an exemplary embodiment of the present invention. The sealing assembly 1 includes a first ring 11 and a second ring 12. The first ring 11 has a first annular groove 111. The first annular groove 111 is arranged to extend axially around the first ring 11. The first annular groove 111 is configured to be filled with lubricant. The second ring 12 includes a ring body 121 and annular teeth 122. The ring body 121 is spaced apart from the first ring 11 along the axial or radial direction of the first ring 11. The annular teeth 122 are connected to the surface of the ring body 121 facing the first ring 11. The annular teeth 122 are arranged to extend axially around the ring body 121. The annular teeth 122 are inserted into the first annular groove 111 and are gap-fitted with the first annular groove 111.

[0036] It is understood that the lubricant can be a lubricating liquid or a grease, and the specific selection can be made according to the application scenario. For example, when the axis of the first annular groove 111 is parallel to the direction of gravity, correspondingly, the notch of the first annular groove 111 faces upward, and the first annular groove 111 can be filled with grease or a lubricating liquid. For another example, when the axis of the first annular groove 111 forms an acute angle with the direction of gravity, in order to prevent the lubricant from flowing out of the first annular groove 111 and to ensure the lubrication effect between the first ring 11 and the annular tooth 122, the first annular groove 111 can be filled with grease.

[0037] Specifically, one of the first ring 11 and the second ring 12 is connected to the guide bearing oil tank 21, and the other is sleeved on the main shaft.

[0038] For example, the sealing assembly 1 can be disposed in the guide bearing oil tank 21 so that the external structure of the turbine 2 is regular and the lubricant can be effectively prevented from being contaminated.

[0039] Exemplarily, the sealing assembly 1 may also be arranged outside the guide bearing oil tank 21 , so that it is convenient to check the lubricant consumption and thus to add lubricant in time to ensure the normal operation of the turbine 2 .

[0040] For example, the ring body 121 is spaced apart from the first ring 11 along the axial direction of the first ring 11, as shown in FIG. Figure 1 and Figure 3 shown.

[0041] For example, the ring body 121 is spaced apart from the first ring 11 along the radial direction of the first ring 11, as shown in FIG. Figure 2 and Figure 4The first ring 11 can be located on the inner ring side of the ring body 121 or on the outer ring side of the ring body 121 .

[0042] In this embodiment, the cooperation between the first annular groove 111 and the annular teeth 122 forms a labyrinth seal between the rotating main shaft 22 and the stationary guide bearing oil tank 21. Furthermore, by filling the first annular groove 111 with lubricant, lubrication is achieved between the first ring 11 and the second ring 12, which are subject to relative motion, and a low-friction contact seal is formed between the first ring 11 and the second ring 12, which are subject to relative motion, thereby improving the sealing performance between the main shaft 22 and the guide bearing oil tank 21. In this manner, when oil mist flows into the mating portion between the main shaft 22 and the guide bearing oil tank 21, it is blocked by the lubricant, effectively preventing the oil mist from escaping from the mating clearance between the guide bearing oil tank 21 and the main shaft 22.

[0043] See also Figure 1 or Figure 2 In some embodiments, there are multiple first annular grooves 111 and multiple annular teeth 122. Each of the multiple first annular grooves 111 corresponds to each of the multiple annular teeth 122. This creates multiple seals between the first ring 11 and the second ring 12, improving the seal between the main shaft 22 and the guide bearing oil tank 21.

[0044] See also Figure 1 or Figure 2 In some embodiments, two adjacent annular teeth 122 are spaced apart to define a second annular groove 123. A first through hole 124 is provided on the ring body 121. One end of the first through hole 124 is connected to the second annular groove 123, and the other end is configured to communicate with the outside.

[0045] It will be appreciated that a portion of the first annular groove 111 is covered by the second ring 12, while the remaining portion is open. As the spindle 22 rotates, the lubricant within the first annular groove 111 generates centrifugal force. This centrifugal force causes the lubricant to climb toward the opening of the first annular groove 111. This can cause the lubricant to be ejected from the open opening of the first annular groove 111, reducing the amount of lubricant within the first annular groove 111 and compromising the sealing of the clearance between the first ring 11 and the second ring 12.

[0046] Therefore, in this embodiment, by providing a first through-hole 124 communicating with the second annular groove 123, the pressure within the second annular groove 123 is balanced. This allows the lubricant to not only climb toward the open notch of the first annular groove 111 under the action of centrifugal force, but also climb within the second annular groove 123 toward the ring body 121, remaining in the first through-hole 124. The lubricant remaining in the first through-hole 124 can flow back into the first annular groove 111 under the action of gravity after the main shaft 22 stops rotating. This not only reduces lubricant loss but also ensures sufficient lubricant between the first ring 11 and the second ring 12, thereby improving the reliability of the turbine 2.

[0047] In addition, the first through hole 124 can also serve as a lubricant replenishing channel. Lubricant can be replenished into the first annular groove 111 through the first through hole 124, thereby improving the maintenance efficiency of the turbine 2 and reducing the maintenance cost of the turbine 2.

[0048] See also Figure 1 or Figure 2 In some embodiments, the thickness of the plurality of annular teeth 122 is equal. This not only improves the structural uniformity of the second ring 12 and the stress state of the second ring 12 , but also reduces the design difficulty of the sealing assembly 1 .

[0049] See also Figure 1 or Figure 2 In some embodiments, the widths of the plurality of first annular grooves 111 are equal. This not only improves the structural uniformity of the first ring 11 and the stress state of the first ring 11 , but also reduces the design difficulty of the sealing assembly 1 .

[0050] See also Figure 1 or Figure 2 In some embodiments, the first annular groove 111 has a width dimension W1, and the annular tooth 122 has a thickness dimension W2, satisfying: 1.2W2≤W1≤6W2.

[0051] It can be understood that the width dimension W1 of the first annular groove 111 includes but is not limited to 1.2W2, 1.3W2, 1.4W2, 1.5W2, 1.6W2, 1.7W2, 1.8W2, 1.9W2, 2W2, 2.1W2, 2.2W2, 2.3W2, 2.4W2, 2.5W2, 2.6W2, 2.7W2, 2.8W2, 2.9W2, 3W2, 3.1W2, 3.2W2, 3.3W2, 3 .4W2, 3.5W2, 3.6W2, 3.7W2, 3.8W2, 3.9W2, 4W2, 4.1W2, 4.2W2, 4.3W2, 4.4W2, 4.5W2, 4.6W2, 4. 7W2, 4.8W2, 4.9W2, 5W2, 5.1W2, 5.2W2, 5.3W2, 5.4W2, 5.5W2, 5.6W2, 5.7W2, 5.8W2, 5.9W2, 6W2.

[0052] In this embodiment, through the above-mentioned limitation, on the one hand, it is possible to avoid the gap between the inner wall of the first annular groove 111 and the annular tooth 122 being too small, thereby ensuring that there is sufficient lubricant between the inner wall of the first annular groove 111 and the annular tooth 122, so as to ensure the sealing between the first ring 11 and the second ring 12 and the smoothness of the relative rotation between the first ring 11 and the second ring 12; on the other hand, it is possible to avoid the gap between the inner wall of the first annular groove 111 and the annular tooth 122 being too large, resulting in more lubricant being required to be filled, thereby controlling the lubrication cost.

[0053] In some embodiments, the spacing between the annular teeth 122 and the sidewalls of the first annular groove 111 is consistent with the spacing between the annular teeth 122 and the bottom wall of the first annular groove 111. This allows for a more uniform lubricant barrier layer to be formed between the annular teeth 122 and the inner wall of the first annular groove 111, thereby facilitating the formation of a stable oil film, thereby improving the sealing between the first ring 11 and the second ring 12 and preventing oil mist leakage.

[0054] See also Figure 1 In some embodiments, the ring body 121 is spaced apart from the first ring 11 along its axial direction. The outer circumference of the outermost annular teeth 122 is co-circumferential with the outer circumference of the ring body 121. This improves the structural regularity of the first ring 11 and improves the stress state of the first ring 11.

[0055] In some embodiments, the ring body 121 is spaced apart from the first ring 11 along its axial direction. The inner circumference of the innermost annular teeth 122 is co-circumferential with the inner circumference of the ring body 121. This improves the structural regularity of the first ring 11 and improves the stress state of the first ring 11.

[0056] See also Figure 2In some embodiments, the ring body 121 is spaced apart from the first ring 11 in the radial direction of the first ring 11, and the surface of the annular teeth 122 at at least one end of the ring body 121 facing away from the first annular groove 111 is coplanar with the adjacent end surface of the ring body 121. This improves the structural regularity of the first ring 11 and facilitates improving the stress state of the first ring 11.

[0057] According to the second aspect of the present invention, an embodiment of the present invention further provides a water turbine 2, such as Figure 5 and Figure 6 As shown, Figure 5 is a partial structural diagram of a water turbine 2 provided in an exemplary embodiment of the present invention, Figure 6 yes Figure 5 An enlarged schematic diagram of point A in the figure. The turbine 2 includes a guide bearing oil tank 21, a main shaft 22, and the aforementioned seal assembly 1. The guide bearing oil tank 21 has an inner cavity and a mating through-hole 211 communicating with the inner cavity. The main shaft 22 is disposed within the inner cavity. One end of the main shaft 22 extends through the mating through-hole 211. One of the first ring 11 and the second ring 12 is connected to the guide bearing oil tank 21, while the other is sleeved onto the main shaft 22. Lubricant is provided in the first annular groove 111.

[0058] It can be understood that the first ring 11 and the second ring 12 can be arranged inside the guide bearing oil tank 21 , and can also be arranged outside the guide bearing oil tank 21 .

[0059] Exemplarily, the seal assembly 1 is disposed within the guide bearing oil tank 21. The ring body 121 is spaced apart from the first ring 11 along its axial direction. The inner circumference of the ring body 121 is connected to the main shaft 22. The end of the first ring 11 facing away from the first annular groove 111 is connected to the inner wall of the guide bearing oil tank 21. A mating through-hole 211 is located on the inner ring side of the first ring 11.

[0060] As will be understood, the turbine 2 also includes a small-gap seal 23, a volute, a draft tube, a runner, and guide vanes. The draft tube is located at one end of the volute. The main shaft 22 is rotatably mounted within the volute via a bearing. The runner is sleeved onto the main shaft 22 and positioned between the main shaft 22 and the volute. Multiple guide vanes are positioned between the volute and the runner. The small-gap seal is mounted on the wall of the mating through hole 211 and provides a clearance fit with the main shaft 22.

[0061] Illustratively, the guide bearing oil tank 21 includes a housing 212, a cover plate 213, and a base plate 214. The housing 212 is annular and fits over the spindle 22. A mating through-hole 211 is provided in the housing cover, which covers one end of the housing 212 and fits over the spindle 22. The base plate 214 covers the other end of the housing 212 and fits over the spindle 22.

[0062] It is understood that the water turbine 2 includes the above-mentioned sealing assembly 1. The water turbine 2 has all the beneficial effects of the above-mentioned sealing assembly 1, and the present invention will not be repeated here.

[0063] See also Figure 5 and Figure 6 In some embodiments, the seal assembly 1 is disposed within the guide bearing oil tank 21. The first ring 11 is sleeved onto the main shaft 22. The second ring 12 is connected to the guide bearing oil tank 21. The guide bearing oil tank 21 is provided with a second through-hole 215. The second through-hole 215 communicates with the first through-hole 124 provided in the second ring 12. This balances the pressure within the second annular groove 123, allowing the lubricant to not only flow toward the open notch of the first annular groove 111 under centrifugal force but also flow within the second annular groove 123 toward the ring body 121, remaining in the first through-hole 124 and the second through-hole 215. The lubricant remaining in the first through-hole 124 and the second through-hole 215 can flow back into the first annular groove 111 under the action of gravity after the main shaft 22 stops rotating. This not only reduces lubricant loss but also ensures sufficient lubricant between the first ring 11 and the second ring 12, thereby improving the reliability of the turbine 2.

[0064] In addition, the second through hole 215 can also serve as a lubricant replenishing channel. Lubricant can be replenished into the first annular groove 111 through the second through hole 215 and the first through hole 124 in sequence, thereby improving the maintenance efficiency of the turbine 2 and reducing the maintenance cost of the turbine 2.

[0065] See also Figure 5 and Figure 6 In some embodiments, the turbine 2 further includes a clamp 24 sleeved on the main shaft 22 . One of the first ring 11 and the second ring 12 connected to the main shaft 22 is connected to the main shaft 22 via the clamp 24 .

[0066] In this way, the one connected to the main shaft 22 can be detachably connected to the main shaft 22 to facilitate later maintenance.

[0067] Specifically, the first ring 11 is connected to the main shaft 22 via a hoop 24 .

[0068] For example, the first ring 11 includes multiple sub-segments, which are sequentially arranged along the circumference of the first ring 11, with sealant applied between adjacent sub-segments. The clamp 24 includes multiple segments and bolt fasteners that sequentially connect the segments. Each segment is connected to each of the sub-segments. The bolt fasteners include bolts and nuts. The ends of the bolts pass through the bolt holes in two adjacent segments and then threadably connect with the nuts. In this manner, the clamp 24 secures the sub-segments into a ring shape for attachment to the main shaft 22.

[0069] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0070] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0071] The embodiments, implementation methods and related technical features of the present invention can be combined and replaced with each other without conflict.

[0072] The above are merely preferred embodiments of the present invention and do not constitute any form of limitation to the present invention. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A sealing assembly (1), characterized in that: include: A first ring (11) having a first annular groove (111), wherein the first annular groove (111) is arranged to extend in an axial direction of the first ring (11), and the first annular groove (111) is configured to be filled with lubricant; a second ring (12), comprising a ring body (121) and an annular tooth (122), wherein the ring body (121) is spaced apart from the first ring (11) along the axial direction or radial direction of the first ring (11), and the annular tooth (122) is connected to a surface of the ring body (121) facing the first ring (11), and the annular tooth (122) is extended around the axial direction of the ring body (121); The annular tooth (122) is inserted into the first annular groove (111) and is loosely fitted with the first annular groove (111); There are a plurality of the first annular grooves (111) and the annular teeth (122), and the plurality of the first annular grooves (111) correspond one to one with the plurality of the annular teeth (122); Two adjacent annular teeth (122) are spaced apart to define a second annular groove (123); a first through hole (124) is provided on the ring body (121); one end of the first through hole (124) is communicated with the second annular groove (123), and the other end is configured to communicate with the outside; the first through hole (124) is provided on the bottom wall of the second annular groove (123), and is communicated with the gap between the groove side wall of the second annular groove (123) away from the axis and the groove side wall of the first annular groove (111) adjacent to it; the end of the first through hole (124) away from the second annular groove (123) is extended obliquely toward the axis of the ring body (121).

2. The sealing assembly (1) according to claim 1, characterized in that The thicknesses of the plurality of annular teeth (122) are equal, and / or the widths of the plurality of first annular grooves (111) are equal.

3. The sealing assembly (1) according to claim 1, characterized in that The first annular groove (111) has a width dimension W1, and the annular tooth (122) has a thickness dimension W2, satisfying: 1.2W2≤W1≤6W2.

4. The sealing assembly (1) according to claim 1, characterized in that The ring body (121) is spaced apart from the first ring (11) along the axial direction of the first ring (11); The outer peripheral surface of the outermost annular tooth (122) is co-circumferentially arranged with the outer peripheral surface of the ring body (121), and / or the inner peripheral surface of the innermost annular tooth (122) is co-circumferentially arranged with the inner peripheral surface of the ring body (121).

5. The sealing assembly (1) according to any one of claims 1 to 4, characterized in that The ring body (121) is spaced apart from the first ring (11) along the radial direction of the first ring (11), and the surface of the annular tooth (122) at least at one end of the ring body (121) facing away from the first annular groove (111) is coplanar with the end face of the ring body (121) adjacent thereto.

6. A water turbine (2), characterized in that: include: A guide bearing oil tank (21) having an inner cavity and a matching through hole (211) communicating with the inner cavity; A main shaft (22) is inserted into the inner cavity, and one end of the main shaft (22) passes through the matching through hole (211); And, the sealing assembly (1) according to any one of claims 1 to 5, wherein one of the first ring (11) and the second ring (12) is connected to the guide bearing oil tank (21), and the other is sleeved on the main shaft (22); Wherein, lubricant is provided in the first annular groove (111).

7. The water turbine (2) according to claim 6, characterized in that The sealing assembly (1) is arranged in the guide bearing oil tank (21), the first ring (11) is sleeved on the main shaft (22), the second ring (12) is connected to the guide bearing oil tank (21), and a second through hole (215) is provided on the guide bearing oil tank (21), and the second through hole (215) is communicated with a first through hole (124) provided on the second ring (12).

8. The water turbine (2) according to claim 6, characterized in that The water turbine (2) further comprises a hoop (24), wherein the hoop (24) is sleeved on the main shaft (22), and one of the first ring (11) and the second ring (12) connected to the main shaft (22) is connected to the main shaft (22) via the hoop (24).

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