Sealing structure and water guide bearing

Abstract

The utility model relates to the technical field of sealing equipment, in particular to a sealing structure and a water guide bearing, which comprise a water machine shaft and a rotary oil basin arranged outside the water machine shaft, turbine oil is arranged in the rotary oil basin, and a water guide shoe is arranged between the outside of the water machine shaft and the rotary oil basin. A bearing base is arranged outside the water machine shaft and located above the rotary oil basin. The sealing assembly comprises an oil baffle plate fixedly installed on the upper portion of the inner cavity of the rotary oil basin and close to the back face of the water guide shoe. The water guide shoe has the advantages that rising oil mist can be blocked and prevented from directly flowing into the gap between the rotating oil basin and the back face of the water guide shoe through the oil baffle, the annular plate installed on the lower portion of the oil baffle can guide oil flow blocked by the oil baffle, the oil flow makes contact with the rising oil mist, and therefore the oil mist can be prevented from flowing out of the water guide shoe. In addition, by means of the arrangement of the sealing ring, the assembly gap between the rotary oil basin and the water guide shoe is reduced, and the oil throwing condition of the rotary oil basin is further reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing equipment, in particular to a sealing structure and a water-guided bearing. Background Art

[0002] Water-guided bearings are important components of hydro-generator bearings. Their main function is to prevent the shaft from swinging and to withstand the mechanical imbalance force of the rotor and the unilateral magnetic pull caused by the rotor eccentricity.

[0003] During the rotation of the main shaft, friction generates a significant amount of heat. If not dissipated promptly, this heat can cause irreversible damage to the shaft. Therefore, existing water-guided bearings are typically equipped with cooling devices to dissipate heat. However, the oil in the rotating oil basin is prone to turbulence and splashing during rotation. This turbulence causes the oil and air to mix, generating a large number of bubbles, exacerbating the formation of oil mist. This can easily create negative pressure at the journal seal, causing oil overflow. This not only wastes turbine oil resources and increases the workload of operators and maintenance personnel, but the leaking turbine oil can also pollute the surrounding environment. Utility Model Content

[0004] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and in the abstract and title of the utility model to avoid obscuring the purpose of this section, the abstract and the title of the utility model, and such simplifications or omissions shall not be used to limit the scope of the present invention.

[0005] In view of the technical problem in the prior art that the cooling oil in the water-guided bearing is prone to overflow, the present utility model is proposed.

[0006] The utility model aims to provide a sealing structure, which aims to prevent the oil in the rotating oil pan from escaping under the action of centrifugal force.

[0007] To address the aforementioned technical issues, the present invention provides the following technical solution: a sealing structure comprising a mounting assembly, a turbine shaft, and a rotating oil pan disposed externally of the turbine shaft, the rotating oil pan containing turbine oil, a water guide shoe disposed between the turbine shaft exterior and the rotating oil pan, and a bearing base disposed externally of the turbine shaft and above the rotating oil pan. The sealing assembly comprises an oil baffle fixedly mounted above the rotating oil pan cavity and proximate to the back of the water guide shoe.

[0008] As a preferred solution of the sealing structure of the utility model, a ring plate is provided at the bottom of the oil baffle.

[0009] As a preferred solution of the sealing structure of the present invention, a sealing ring is provided on the upper end surface of the rotating oil basin and close to the back of the water guide shoe.

[0010] As a preferred solution of the sealing structure of the utility model, a plurality of comb-tooth cavities are provided on the inner side of the sealing ring and the end close to the rotating oil basin and the water guide shoe.

[0011] As a preferred solution of the sealing structure of the utility model, the cross section of the comb tooth cavity on the rotating oil pan is triangular, and the cross section of the comb tooth cavity on the sealing ring is rectangular.

[0012] As a preferred solution of the sealing structure of the present invention, the sealing ring is provided with a guide hole penetrating the comb tooth cavity, and only the lower end of the guide hole penetrates the sealing ring.

[0013] The beneficial effects of the sealing structure of the present invention are as follows: by setting the oil baffle, the rising oil mist can be blocked to prevent it from directly flowing into the gap between the rotating oil basin and the back of the water guide shoe. The ring plate installed at the lower part of the oil baffle will provide a guiding effect for the oil flow intercepted by the oil baffle, so that it contacts the rising oil mist and reduces the splashing of the oil. In addition, by setting the sealing ring, the assembly gap between the rotating oil basin and the water guide shoe is reduced, further reducing the oil throwing of the rotating oil basin.

[0014] Another object of the present invention is to provide a water-guided bearing, which aims to solve the shortcoming of low heat dissipation efficiency of the water turbine shaft during operation.

[0015] In order to solve the above technical problems, the present invention also provides the following technical solutions: a water-guided bearing, which includes a sealing structure; and a cooling assembly, which includes a cooling device arranged on a bearing base.

[0016] As a preferred solution of the water-guided bearing of the present invention, the oil inlet end of the cooling device is provided with a Pitot tube connected to a rotating oil basin, the bearing base is provided with an upper oil groove, and the interior of the upper oil groove is provided with an upper oil pipe connected to the cooling device, and the inner cavity of the upper oil groove and the inner cavity of the rotating oil basin are respectively provided with a first connection port and a second connection port for the flow of turbine oil at a position close to the water turbine shaft.

[0017] As a preferred solution of the water-guided bearing of the present invention, the cooling device is detachably mounted on the bearing base by mounting bolts.

[0018] The beneficial effects of the water-guided bearing of the present invention are as follows: by utilizing the setting of the cooling device, the turbine oil can be cooled in Jiangxi, the temperature difference between the turbine oil and the water turbine shaft can be expanded, thereby improving the cooling effect of the turbine oil on the water turbine shaft, and through the setting of the connection port 1 and the connection port 2, the turbine oil can be recycled, reducing the waste of turbine oil resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0020] Figure 1 It is a schematic diagram of the overall structure of the present utility model.

[0021] Figure 2 This is a schematic diagram of the local structure of the rotating oil basin in the utility model.

[0022] Figure 3 for Figure 2 Schematic diagram of the enlarged structure of area A in the middle.

[0023] Figure 4 This is a schematic diagram of the operating structure of the rotary oil basin in the utility model.

[0024] Figure 5 This is a schematic diagram of the cooling component structure in the present utility model. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0028] Example 1, with reference to Figures 1 to 4, is the first embodiment of the present utility model, which provides a sealing structure, an installation assembly 100, including a water turbine shaft 101, and a rotating oil basin 103 arranged outside the water turbine shaft 101, and turbine oil is provided in the rotating oil basin 103, a water guide shoe 102 is provided between the outside of the water turbine shaft 101 and the rotating oil basin 103, and a bearing base 104 is provided outside the water turbine shaft 101 and above the rotating oil basin 103. The water guide shoe 102 plays an important role in friction protection during the operation of the water turbine shaft 101. Through its unique parabolic shoe surface design, it forms effective contact with the journal of the water turbine shaft 101, reducing friction loss, thereby protecting the water turbine shaft 101 and the bearing from excessive wear. The sealing assembly 200 includes an oil baffle 201 fixedly mounted on the upper part of the inner cavity of the rotating oil basin 103 and close to the back of the water guide shoe 102. During the rotation of the rotating oil pan 103, the turbine oil near the rotation center is subjected to a smaller centripetal force, while the turbine oil at the edge is subjected to a larger centripetal force. Therefore, the turbine oil at the edge will move outward, but due to the obstruction of the inner wall of the rotating oil pan 103, it cannot be truly thrown out. Therefore, it will gradually accumulate upward to form a bulge, raising the initial height of the oil mist. At this time, the air pressure in the rotating oil pan 103 is higher than the external air pressure. Therefore, under the action of the air pressure difference, the oil mist is easy to overflow along the assembly gap between the rotating oil pan 103 and the back of the water guide shoe 102, resulting in a waste of turbine oil. Figure 4 As shown, in this embodiment, an oil baffle plate 201 is installed at the upper part of the inner cavity of the rotating oil basin 103 and near the back of the water guide shoe 102. When the oil mist flows toward the assembly gap under the action of the air pressure difference, it will be blocked by the oil baffle plate 201, thereby reducing the oil splashed in the rotating oil basin 103 from entering the gap between the rotating oil basin 103 and the back of the water guide shoe 102, thereby reducing oil overflow during the operation of the water guide bearing.

[0029] Furthermore, a ring plate 202 is provided at the bottom of the oil baffle 201. The ring plate 202 is provided so that the oil flow that hits the oil baffle 201 will fall onto the ring plate 202 and flow downward along the ring plate 202. At this time, the ring plate 202 provides a guide for this part of the oil flow, allowing it to directly contact the rising oil mist. Some larger oil droplets in the oil mist will mix with the oil flow and then fall, thereby reducing oil splashing.

[0030] Furthermore, a sealing ring 203 is provided on the upper end surface of the rotating oil pan 103 near the back of the water guide shoe 102. The provision of the sealing ring 203 reduces the assembly gap between the rotating oil pan 103 and the back of the water guide shoe 102, further reducing the oil spillage of the rotating oil pan 103.

[0031] When in use, the setting of the oil baffle 201 can block the rising oil mist and prevent it from flowing directly into the gap between the rotating oil basin 103 and the back of the water guide shoe 102. The ring plate 202 installed at the lower part of the oil baffle 201 will provide a guiding effect for the oil flow intercepted by the oil baffle 201, so that it contacts the rising oil mist and reduces the splashing of the oil. In addition, the setting of the sealing ring 203 reduces the assembly gap between the rotating oil basin 103 and the water guide shoe 102, further reducing the oil throwing of the rotating oil basin 103.

[0032] Example 2, reference Figure 3 This is the second embodiment of the present invention. Unlike the previous embodiment, it also includes a plurality of comb-tooth cavities 204 located inside the sealing ring 203 and near the ends of the rotating oil basin 103 and the water guide shoe 102. The arrangement of these multiple comb-tooth cavities 204 forms a maze-like oil flow path, forcing the oil mist to change direction multiple times as it passes through these comb teeth, significantly increasing its flow resistance. This maze effect also helps reduce leakage. The multiple comb-tooth cavities 204 form a multi-stage sealing channel, gradually attenuating the kinetic energy of the oil mist and further enhancing the sealing effect.

[0033] Furthermore, the cross section of the comb cavity 204 on the rotating oil pan 103 is triangular, and the cross section of the comb cavity 204 on the sealing ring 203 is rectangular. Figure 3 As shown, one side of the triangular comb tooth cavity 204 is tilted downward to facilitate the oil entering the triangular comb tooth cavity 204 to flow back into the rotating oil basin 103. However, the edge of the triangular comb tooth cavity 204 is easily worn when the rotating oil basin 103 rotates, affecting its sealing performance. Therefore, this embodiment provides a rectangular comb tooth cavity 204 on the inner side of the sealing ring 203, which is not only simple to process but also more evenly worn, thereby helping to increase the service life of the sealing ring 203.

[0034] Furthermore, the sealing ring 203 is provided with a diversion hole 205 that penetrates the comb cavity 204, with only the lower end of the diversion hole 205 penetrating the sealing ring 203. The provision of the diversion hole 205 facilitates the return of oil mist flowing into the rectangular comb cavity 204 to the rotating oil basin 103 through the diversion hole 205, thereby realizing the recycling of turbine oil and reducing its pollution to the surrounding environment.

[0035] When in use, the arrangement of the comb cavity 204 increases the resistance to the flow of the oil mist and forms a multi-stage sealing channel, so that the kinetic energy of the oil mist can be attenuated step by step, further improving the sealing effect.

[0036] Example 3, reference Figure 5This is the third embodiment of the present invention, which further provides a water-guided bearing. It includes a cooling assembly 300, including a cooling device 301 disposed on the bearing base 104. Cooling device 301 cools the turbine oil in the rotating oil basin 103, increasing the temperature difference between the turbine oil and the turbine shaft 101, thereby improving the cooling effect of the turbine oil on the bearing.

[0037] Furthermore, the oil inlet end of the cooling device 301 is provided with a Pitot tube 302 connected to the rotating oil basin 103, the bearing base 104 is provided with an upper oil groove 303, and the upper oil groove 303 is provided with an upper oil pipe 304 connected to the cooling device 301, and the inner cavity of the upper oil groove 303 and the inner cavity of the rotating oil basin 103 and the position close to the water turbine shaft 101 are respectively provided with a connection port 1 305 and a connection port 2 306 for the flow of turbine oil. When the rotating oil basin 103 rotates, centrifugal force is generated. Under the action of centrifugal force, the turbine oil in the rotating oil basin 103 will flow into the cooling device 301 along the Pitot tube 302. After being cooled by the cooling device 301, the turbine oil will enter the upper oil tank 303 along the upper oil pipe 304 and flow to the surface of the water turbine shaft 101 through the connecting port 1 305. The water turbine shaft 101 is heat-dissipated by heat exchange, thereby ensuring the service life of the water turbine shaft 101. The turbine oil on the water turbine shaft 101 will gradually gather downward under the action of gravity and return to the inside of the rotating oil basin 103 through the connecting port 2 306, realizing the recycling of the turbine oil.

[0038] Furthermore, the cooling device 301 is detachably mounted on the bearing base 104 by means of mounting bolts. The detachable mounting design increases the convenience of installing the cooling device 301 and improves its adjustable mounting performance.

[0039] When in use, the setting of the cooling device 301 can be used to cool the turbine oil, expand the temperature difference between it and the water turbine shaft 101, thereby improving the cooling effect of the turbine oil on the water turbine shaft 101, and through the setting of the connection port 1 305 and the connection port 2 306, the turbine oil can be recycled, reducing the waste of turbine oil resources.

[0040] It is important to note that the construction and arrangement of the present application shown in a number of different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values (e.g., temperature, pressure, etc.), mounting arrangements, use of materials, colors, directional changes, etc.) without departing substantially from the novel teachings and advantages of the subject matter described in this application. For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of the element may be inverted or otherwise changed, and the nature or number or position of the discrete elements may be altered or changed. Therefore, all such modifications are intended to be included within the scope of the present invention. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "means plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also an equivalent structure. Without departing from the scope of the present invention, other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0041] Additionally, in order to provide a concise description of example embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0042] It will be appreciated that in the development of any actual embodiment, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will, for those of ordinary skill having the benefit of this disclosure, be a routine undertaking of design, fabrication, and production without undue experimentation.

[0043] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, and all of these should be included in the scope of the claims of the present invention.

Claims

1. A sealing structure, characterized in that: include, The mounting assembly (100) comprises a water turbine shaft (101) and a rotating oil basin (103) arranged outside the water turbine shaft (101), wherein turbine oil is provided in the rotating oil basin (103), a water guide shoe (102) is provided between the outside of the water turbine shaft (101) and the rotating oil basin (103), and a bearing base (104) is provided outside the water turbine shaft (101) and above the rotating oil basin (103); The sealing assembly (200) comprises an oil baffle (201) fixedly mounted on the upper portion of the inner cavity of the rotating oil basin (103) and close to the back side of the water guide shoe (102).

2. The sealing structure according to claim 1, wherein: A ring plate (202) is provided at the bottom of the oil baffle (201).

3. The sealing structure according to claim 2, wherein: A sealing ring (203) is provided on the upper end surface of the rotating oil basin (103) and close to the back surface of the water guide shoe (102).

4. The sealing structure according to claim 3, wherein: A plurality of comb-tooth cavities (204) are provided on the inner side of the sealing ring (203) and at the end close to the rotating oil basin (103) and the water guide shoe (102).

5. The sealing structure according to claim 4, wherein: The cross section of the comb tooth cavity (204) on the rotating oil basin (103) is triangular.

6. The sealing structure according to claim 5, wherein: The cross section of the comb tooth cavity (204) on the sealing ring (203) is rectangular.

7. The sealing structure according to claim 6, wherein: The sealing ring (203) is provided with a diversion hole (205) that penetrates the comb tooth cavity (204), and only the lower end of the diversion hole (205) penetrates the sealing ring (203).

8. A water-guided bearing, characterized in that: comprising the sealing structure according to any one of claims 1 to 7; and The cooling assembly (300) includes a cooling device (301) disposed on a bearing base (104).

9. The water-guided bearing according to claim 8, wherein: The oil inlet end of the cooling device (301) is provided with a Pitot tube (302) connected to the rotating oil basin (103); the bearing base (104) is provided with an upper oil groove (303), and the upper oil groove (303) is provided with an upper oil pipe (304) connected to the cooling device (301); the inner cavity of the upper oil groove (303) and the inner cavity of the rotating oil basin (103) and the position close to the hydraulic shaft (101) are respectively provided with a connection port 1 (305) and a connection port 2 (306) for the flow of turbine oil.

10. The water-guided bearing according to claim 9, wherein: The cooling device (301) is detachably mounted on the bearing base (104) via mounting bolts.

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