Main shaft sealing structure of water turbine

Abstract

The utility model discloses a main shaft sealing structure of a water turbine, and aims to provide the main shaft sealing structure of the water turbine, which can improve the sealing stability. The main shaft body is connected with the shaft hole in an inserted mode, the shaft hole is provided with a water sealing packing and a first sealing ring, the water sealing packing and the first sealing ring are both connected with the main shaft body in a sleeved mode, the movable groove is detachably connected with a fixing base, the fixing base is connected with a locking plate and a locking rod, the locking rod is rotationally connected with the fixing base, one end of the locking plate is connected with the locking rod, and the other end of the locking plate is connected with the main shaft body. And the other end of the locking plate is sleeved with the water sealing packing. The sealing structure has the beneficial effects that the sealing structure is convenient to operate and has adjustability, and the sealing operation is stable, comprehensive and uniform; the locking strength of the water sealing packing is improved; the sealing adjustment convenience and the sealing stability are improved; disassembly and maintenance are convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of water turbines, in particular to a main shaft sealing structure of a water turbine. Background Art

[0002] An axial hole is provided at the center of the turbine casing, and a main shaft is inserted into the axial hole. An embedding groove is provided on the upper side of the axial hole, and a sealing ring is installed in the embedding groove. Asbestos fiber packing is provided on the inner wall of the sealing ring. Asbestos fiber packing has good sealing and lubricity, it can prevent water from escaping from the embedding groove.

[0003] China Patent Authorization Publication Number: CN 210422856 U, Authorization Publication Date: April 28, 2020. This utility model relates to a main shaft sealing structure for a hydraulic turbine, comprising a hydraulic turbine housing, an axial hole disposed at the center of the hydraulic turbine housing, a main shaft inserted into the axial hole, an embedding groove disposed on the hydraulic turbine housing above the axial hole, and a sealing ring mounted within the embedding groove. A packing groove is provided on the hydraulic turbine housing above the embedding groove, a water sealing packing is mounted within the packing groove, and a packing is loaded within the packing groove on the upper surface of the water sealing packing. A disadvantage of this technical solution is that the water sealing packing is squeezed by an upper pressure ring, resulting in insufficient force uniformity and stability, which affects the sealing performance of the main shaft.

[0004] In summary: the main shaft of the turbine has the disadvantage of low sealing stability. Utility Model Content

[0005] The utility model aims to overcome the shortcoming of low sealing stability of a main shaft of a water turbine in the prior art and provides a main shaft sealing structure of a water turbine with improved sealing stability.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A main shaft sealing structure of a water turbine includes a casing and a main shaft body. The casing is provided with a movable groove and a shaft hole. The main shaft body is plugged into the shaft hole. The shaft hole is provided with a water sealing packing and a sealing ring. Both the water sealing packing and the sealing ring are sleeved with the main shaft body. The movable groove is detachably connected to a fixed seat. The fixed seat is connected to a locking plate and a locking rod. The locking rod is rotatably connected to the fixed seat. One end of the locking plate is connected to the locking rod, and the other end of the locking plate is sleeved with the water sealing packing.

[0008] The casing is provided with an axial hole for passing through the main shaft body, which is fitted with a water-sealing packing and a sealing ring. The water-sealing packing and sealing ring are arranged vertically and connected to the main shaft body to seal the connection between the main shaft body and the casing, preventing liquid from penetrating from the bottom of the casing or between the main shaft body and the casing into the top of the casing and disrupting the operation of the turbine. Furthermore, the upper end surface of the casing is provided with an annular recessed movable groove. The movable groove is detachably connected to a fixed seat. The fixed seat is detachably connected to the casing to facilitate the overall removal of the fixed seat and maintain the integrity of the main shaft body, water-sealing packing, and sealing ring. A locking plate is connected to the outside of the water-sealing packing. By rotating a locking rod connected to the other end of the locking plate, the diameter of the locking plate's enclosed connection is reduced, thereby fully and evenly locking the water-sealing packing, allowing the water-sealing packing to fit more tightly against the main shaft body to prevent liquid infiltration. This results in a sealing structure that is easy to operate, adjustable, and provides a stable, comprehensive, and uniform sealing operation.

[0009] Preferably, the housing is provided with guide holes and a plurality of locking plates. A limiting hole is provided at one end of the locking plate, and an insert is connected to the other end of the locking plate. The insert of an adjacent locking plate engages with the limiting hole of another locking plate, and the insert passes through the limiting hole and engages with the guide hole. Each locking plate is arranged around the water-sealing packing. The housing is provided with guide holes to allow the insert connected to the locking plate to enter the guide hole after passing through the limiting hole of another locking plate, thereby directional pulling. This makes it easier to apply force and tighten the packing. The multiple locking plates are provided to enclose and tighten the packing, thereby improving the locking strength of the water-sealing packing.

[0010] Preferably, the other end of the insert is connected to a mounting bar, the mounting bar is provided with a connecting hole, the connecting holes are provided in a plurality and are evenly arranged vertically, each connecting hole is provided with a drawstring, the fixing seat is provided with a through-hole and a mounting hole, the mounting hole is connected to the through-hole, the drawstring is plugged into the through-hole, one end of the drawstring is connected to the connecting hole, a locking rod is connected to a locking ring, the mounting hole is provided with a locking groove, one end of the locking rod is plugged into the mounting hole, the locking ring is threadedly connected to the locking groove, and the other end of the drawstring is connected to the locking rod. The end of the insert is connected to the mounting bar to connect to the drawstring through the connecting hole on the mounting bar, the plurality of connecting holes are evenly arranged to connect to the plurality of drawstrings, one end of the drawstring is connected to the insert and the other end passes through the through-hole to connect to the locking rod in the mounting hole, thereby connecting the locking rod to the insert, the locking rod is threadedly connected to the mounting hole via the locking ring, so that the rotation of the locking rod tightens the insert, thereby tightening the locking plate to enclose the water-sealing packing, making the water-sealing packing more closely attached to the main shaft body to prevent water seepage, and the threaded connection of the locking rod facilitates adjustment and locking. The effect of improving the sealing adjustment convenience and sealing stability is achieved.

[0011] Preferably, the other end of the locking rod is connected to a fixing nut, which is sleeved with a washer, positioned between the fixing nut and the surface of the mounting base. The top end of the locking rod is connected to a fixing nut to facilitate turning the locking rod. A washer is sleeved on the locking rod, and when the fixing nut is turned, the washer is pressed against the surface of the mounting base, thereby increasing the connection strength of the locking rod and preventing it from loosening. This further enhances the locking and sealing strength.

[0012] Preferably, the water-sealing packing is provided with a packing ring, which is positioned between the locking plate and the water-sealing packing. The packing ring is positioned between the water-sealing packing and the locking plate so that the locking plate applies uniform force to one side of the packing ring and the other side of the packing ring applies uniform pressure to the water-sealing packing, further improving sealing and stability.

[0013] Preferably, the main shaft is sleeved with a compression ring, which is detachably connected to the fixing seat. The main shaft is sleeved with a compression ring at the upper end of the housing, which is detachably connected to the fixing seat. The compression ring positions and secures the packing ring and water seal packing to prevent deformation, while facilitating disassembly and maintenance of the sealing structure. This further improves sealing performance and facilitates disassembly and maintenance.

[0014] The beneficial effects of the utility model are: the sealing structure is easy to operate, adjustable, and the sealing operation is stable, comprehensive and uniform; the locking strength of the water sealing packing is improved; the convenience of sealing adjustment and the sealing stability are improved; and it is easy to disassemble and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional diagram of the utility model;

[0016] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0017] Figure 3 This is a schematic diagram of the connection between the locking piece and the insert.

[0018] In the figure: 1. Casing, 2. Main shaft, 3. Movable groove, 4. Shaft hole, 5. Water-sealing packing, 6. Sealing ring 1, 7. Fixed seat, 8. Locking plate, 9. Locking rod, 10. Guide hole, 11. Limit hole, 12. Insert, 13. Mounting strip, 14. Connecting hole, 15. Pull rope, 16. Through hole, 17. Mounting hole, 18. Locking ring, 19. Locking groove, 20. Fixing nut, 21. Gasket, 22. Packing ring, 23. Pressure ring, 24. Sealing ring 2, 25. Sealing ring 3, 26. Embossed groove. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0020] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0021] Unless otherwise specified, the relative arrangement of components, numerical expressions, and values ​​described in these embodiments do not limit the scope of this application. For ease of description, spatially relative terms such as "upper," "lower," "left," and "right" are used in the embodiments to illustrate the relationship of one element or feature shown in the figures to another. It should be understood that, in addition to the orientations shown in the figures, spatial terms are intended to include different orientations of the device during use or operation. For example, if the device in the figure is inverted, an element described as being "below" another element or feature would be positioned "above" the other element or feature. Therefore, the exemplary term "below" can include both upper and lower orientations. The device can be positioned in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used herein should be interpreted accordingly. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to scale. Technologies, processes, and equipment known to those skilled in the relevant art may not be discussed in detail, but, where appropriate, should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.It should be noted that like reference numerals and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0022] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0023] Example 1:

[0024] like Figure 1 As shown, a main shaft sealing structure of a hydraulic turbine includes a casing 1 and a main shaft body 2. The casing 1 is provided with a movable groove 3 and a shaft hole 4. The main shaft body 2 is plugged into the shaft hole 4. The shaft hole 4 is provided with a water-sealing packing 5 and a sealing ring 6. The water-sealing packing 5 and the sealing ring 6 are both sleeved with the main shaft body 2. The movable groove 3 is detachably connected to a fixing seat 7. The fixing seat 7 is connected to a locking plate 8 and a locking rod 9. The locking rod 9 is rotatably connected to the fixing seat 7. One end of the locking plate 8 is connected to the locking rod 9, and the other end of the locking plate 8 is sleeved with the water-sealing packing 5.

[0025] like Figure 1 、 3 As shown, the housing 1 is provided with a guide hole 10, and a plurality of locking plates 8 are provided. A limiting hole 11 is provided at one end of the locking plate 8, and an insert 12 is connected to the other end of the locking plate 8. The insert 12 of the adjacent locking plate 8 is plugged into the limiting hole 11 of the other locking plate 8, and the insert 12 passes through the limiting hole 11 and is plugged into the guide hole 10. Each locking plate 8 is arranged around the water sealing packing 5.

[0026] like Figure 2 、 3 As shown, the other end of the insertion strip 12 is connected to the mounting strip 13, and the mounting strip 13 is provided with a connecting hole 14. There are several connecting holes 14 and they are evenly arranged vertically. Each connecting hole 14 is provided with a pull rope 15. The fixing seat 7 is provided with a through hole 16 and a mounting hole 17. The mounting hole 17 is connected to the through hole 16. The pull rope 15 is plugged into the through hole 16. One end of the pull rope 15 is connected to the connecting hole 14. The locking rod 9 is connected to a locking ring 18. The mounting hole 17 is provided with a locking groove 19. One end of the locking rod 9 is plugged into the mounting hole 17. The locking ring 18 is threadedly connected to the lock groove 19. The other end of the pull rope 15 is connected to the locking rod 9.

[0027] like Figure 1 As shown, the other end of the locking rod 9 is connected to a fixing nut 20, which is sleeved with a gasket 21. The gasket 21 is placed between the fixing nut 20 and the surface of the fixing seat 7. The water sealing packing 5 is provided with a packing ring 22, which is placed between the locking plate 8 and the water sealing packing 5. The main shaft body 2 is sleeved with a pressure ring 23, which is detachably connected to the fixing seat 7.

[0028] like Figure 1-3 As shown: the fixing seat 7 is connected to the housing 1 with bolts, and the pressure ring 23 is connected to the fixing seat 7 with bolts, so that the fixing seat 7 and the pressure ring 23 are conveniently connected and easy to disassemble later.

[0029] Guide hole 10 is provided with a second sealing ring 24, which is sleeved onto insert strip 12 to seal guide hole 10 and prevent water seepage. Main shaft body 2 is sleeved with a third sealing ring 25, which is engaged with a groove 26 provided on pressure ring 23. Third sealing ring 25 is in close contact with the end faces of water sealing packing 5, packing ring 22, and locking plate 8, further improving the sealing performance of the structure.

[0030] During use: after the casing 1, the fixing seat 7, the pressure ring 23 and the main shaft body 2 are installed by bolt connection, the fixing nut 20 is continued to be screwed to rotate the locking rod 9 connected to the fixing nut 20, and then the pull rope 15 is pulled to make the locking pieces 8 connected to each other by the inserts 12 surround and tighten the water-sealing packing 5. By applying force, the water-sealing packing 5 is kept in close contact with the surface of the main shaft body 2 to ensure the sealing between the main shaft body 2 and the water-sealing packing 5 to prevent water seepage.

[0031] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A main shaft sealing structure of a hydraulic turbine, characterized in that: The invention comprises a housing (1) and a main shaft body (2), wherein the housing (1) is provided with a movable groove (3) and an axial hole (4), the main shaft body (2) is plugged into the axial hole (4), the axial hole (4) is provided with a water-sealing packing (5) and a sealing ring (6), the water-sealing packing (5) and the sealing ring (6) are both sleeved with the main shaft body (2), the movable groove (3) is detachably connected with a fixing seat (7), the fixing seat (7) is connected with a locking plate (8) and a locking rod (9), the locking rod (9) is rotatably connected with the fixing seat (7), one end of the locking plate (8) is connected to the locking rod (9), and the other end of the locking plate (8) is sleeved with the water-sealing packing (5).

2. The main shaft sealing structure of a hydraulic turbine according to claim 1, characterized in that: The housing (1) is provided with a guide hole (10), a plurality of locking plates (8) are provided, one end of the locking plate (8) is provided with a limiting hole (11), the other end of the locking plate (8) is connected with an insert (12), the insert (12) of an adjacent locking plate (8) is plugged into the limiting hole (11) of another locking plate (8), the insert (12) passes through the limiting hole (11) and is plugged into the guide hole (10), and each locking plate (8) is arranged around the water sealing packing (5).

3. The main shaft sealing structure of a hydraulic turbine according to claim 2, characterized in that: The other end of the inserting strip (12) is connected to a mounting strip (13), the mounting strip (13) is provided with a connecting hole (14), the connecting holes (14) are provided with a plurality of holes and are evenly arranged vertically, the connecting holes (14) are all provided with a pull rope (15), the fixing seat (7) is provided with a through hole (16) and a mounting hole (17), the mounting hole (17) is communicated with the through hole (16), the pull rope (15) is plugged into the through hole (16), one end of the pull rope (15) is connected to the connecting hole (14), the locking rod (9) is connected to a locking ring (18), the mounting hole (17) is provided with a locking groove (19), one end of the locking rod (9) is plugged into the mounting hole (17), the locking ring (18) is threadedly connected to the locking groove (19), and the other end of the pull rope (15) is connected to the locking rod (9).

4. The main shaft sealing structure of a hydraulic turbine according to claim 3, characterized in that: The other end of the locking rod (9) is connected to a fixing nut (20), and the locking rod (9) is sleeved with a gasket (21), and the gasket (21) is placed between the fixing nut (20) and the surface of the fixing seat (7).

5. The main shaft sealing structure of a hydraulic turbine according to claim 1 or 4, characterized in that: The water sealing packing (5) is provided with a packing ring (22), and the packing ring (22) is placed between the locking plate (8) and the water sealing packing (5).

6. The main shaft sealing structure of a hydraulic turbine according to claim 5, characterized in that: The main shaft body (2) is sleeved with a pressure ring (23), and the pressure ring (23) is detachably connected to the fixing seat (7).

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