CN218882823U - Screw protection device for connecting main shaft of generator and rotating wheel of water turbine - Google Patents
Screw protection device for connecting main shaft of generator and rotating wheel of water turbine Download PDFInfo
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- CN218882823U CN218882823U CN202223417361.5U CN202223417361U CN218882823U CN 218882823 U CN218882823 U CN 218882823U CN 202223417361 U CN202223417361 U CN 202223417361U CN 218882823 U CN218882823 U CN 218882823U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
The utility model relates to a screw protection device for generator spindle and hydraulic turbine runner are connected, including hydraulic turbine runner body, the fixed method dish of top fixedly connected with of hydraulic turbine runner body, the top swing joint of fixed method dish has the connection method dish, the top fixedly connected with generator spindle body of connection method dish, the top fixedly connected with mounting flange of generator spindle body, the inboard swing joint of fixed method dish has special screw, the bottom fixedly connected with screw head of special screw, the outside threaded connection of special screw has special nut, special protective sheath is established to the outside threaded connection of special screw. The screw protection device for connecting the generator main shaft and the water turbine runner is also suitable for screws needing to be protected in special places, realizes special protection of the special places and precious screws, has good effect and long service life, saves a large amount of maintenance cost, and has great significance particularly for large-scale water turbine generators.
Description
Technical Field
The utility model relates to a screw protection device technical field specifically is a screw protection device that is used for generator main shaft and hydraulic turbine runner to connect.
Background
The main components of the generator main shaft for transferring energy and connecting the generator with the water turbine at the edge, also called optical axis, are short for a main optical axis, and have symmetrical diameters in the optical system, for example, the main shaft of the spherical mirror is a straight line which is vertical to the mirror surface through the center of the mirror surface, the main shaft of the lens or the optical axis optical system is a connecting line of the centers of the lens surfaces, and the water turbine runner is one of four important flow passage components of the water turbine and an important component of the water turbine for doing work.
The connecting screw of the main shaft of the generator and the rotating wheel of the water turbine is used as a main auxiliary component of the generator set, the connecting screw bears huge torque of output power when the water turbine runs, the connecting screw is important to install a protection device because of special materials, high price and high processing and replacement difficulty, the working environment of the connecting screw is poor, the connecting screw is easy to corrode and damage due to corrosion of water and air, the service life of the connecting screw is shortened, the stability of the connecting screw to the main shaft of the generator and the rotating wheel of the water turbine is influenced, the potential safety hazard is easy to cause under the action of huge torque when the main shaft of the generator and the rotating wheel of the water turbine run, the disassembling difficulty is extremely high after corrosion, and a large amount of maintenance cost is generated.
SUMMERY OF THE UTILITY MODEL
The utility model is not enough to prior art, the utility model provides a screw protection device for generator spindle and hydraulic turbine runner are connected, it is simple to possess processing, and is with low costs, simple to operate and protection effect advantage such as better, the screw majority of having solved present generator spindle and hydraulic turbine runner and being connected all does not have protection device, lead to special screw to soak in aqueous for a long time, damage because of the corrosion of water and air easily, the life of screw has been reduced, and then influence the stability that the screw is connected generator spindle and hydraulic turbine runner, make generator spindle and hydraulic turbine runner operation, easily cause the potential safety hazard under huge button apart from the effect, the degree of difficulty is disassembled very big behind the corrosion, and produce a large amount of cost of maintenance's problem.
In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a screw protection device for generator spindle and hydraulic turbine runner are connected, includes hydraulic turbine runner body, the fixed method dish of top fixedly connected with of hydraulic turbine runner body, the top swing joint of fixed method dish has the connection method dish, the top fixedly connected with generator spindle body of connection method dish, the top fixedly connected with mounting flange of generator spindle body, the inboard swing joint of fixed method dish has special screw, the bottom fixedly connected with screw head of special screw, the outside threaded connection of special screw has special nut, the outside threaded connection of special screw has special protective sheath, the top fixedly connected with protective sheath fixed head of special protective sheath, the outside swing joint of special protective sheath has the lag.
Furthermore, special screw, screw head, special nut, special protective sheath, protective sheath fixed head and protective sheath all are the equidistance and arrange, the outside fixedly connected with chromium-plated layer of special screw, the inboard of special protective sheath is equipped with special screw outside screw thread assorted interior screw thread and special sealed fat layer.
Furthermore, the inboard fixedly connected with two sliding blocks of lag, two the equal fixedly connected with buffer spring in the outside of sliding block, two the equal fixedly connected with spacing arc piece in buffer spring's the outside.
Further, the bottom of the protecting sleeve is fixedly connected with a high-density rubber ring pad, the high-density rubber ring pad is movably connected with the connecting method disc, the protecting sleeve is located on the outer side of the special nut, and the diameter of the protecting sleeve is equal to that of the high-density rubber ring pad.
Further, a nitrile rubber ring pad is fixedly connected to the top of the protection sleeve and movably connected with the special protection sleeve, the nitrile rubber ring pad is located on the outer side of the special protection sleeve, and the diameter of the inner side of the nitrile rubber ring pad is equal to the diameter of the outer side of the special protection sleeve.
Further, the outside swing joint of screw head has spring washer, spring washer is located between screw head and the fixed law dish, spring washer is located between special nut and the connection law dish.
Further, the outside swing joint of screw head has the sealing ring pad, the sealing ring pad is located between special nut and the special protective sheath, the thread groove with screw head outside screw thread looks adaptation is seted up to the inboard of special protective sheath.
Further, the outer side fixedly connected with of hydraulic turbine runner body is the lower leak-stopping quiet ring, the outside swing joint of lower leak-stopping quiet ring has hydraulic turbine runner protective housing, hydraulic turbine runner body is located the inboard of hydraulic turbine runner protective housing.
Furthermore, the inner side of the special protective sleeve is provided with two sliding long grooves, the two sliding blocks are respectively in sliding connection with the two sliding long grooves, and the width of each sliding block is equal to that of each sliding long groove.
Furthermore, limiting arc grooves are formed in the inner side of the special protective sleeve, the number of the limiting arc grooves is two, each limiting arc groove is formed by four limiting arc grooves, the limiting arc grooves are arranged at equal intervals in the inner side of the special protective sleeve, and the limiting arc blocks are connected with the limiting arc grooves in a clamped mode.
Compared with the prior art, the technical scheme of the application has the following beneficial effects:
1. this a screw protection device for generator spindle and hydraulic turbine runner are connected, through setting up special screw, screw head and special nut, can connect fixed method dish and connection method dish, thereby can be in the same place hydraulic turbine runner body and the stable connection of generator spindle body, avoid hydraulic turbine runner body and the phenomenon that generator spindle body takes place to drop at the driven in-process, because special screw is made by special material, cracked phenomenon can prevent to appear in the special screw, can guarantee special screwed connection's effect, special protective sheath uses 304 stainless steel, set up chromium-plated layer in the outside of special screw, can strengthen special screw rust-resistant losing, increase life's purpose.
2. When the special nut and the special screw are required to be isolated and protected, the special protective sleeve is firstly screwed on the top of the special screw, then the protecting sleeve is pushed by force to lead the buffer spring to be in a compressed state, thereby separating the limiting arc block from the limiting arc groove which is clamped at present and leading the protecting sleeve to lose the limiting, the high-density rubber ring pad can be jointed with the connecting method disc by pushing the protective sleeve, and at the moment, through the elasticity of the buffer spring, the limit arc block can be pushed into the limit arc groove which is clamped at present, the protection sleeve can be limited again, thereby completely isolating the special nut and the special screw from the air, realizing the purpose of rust prevention of the special nut and the special screw, and through arranging the special protective sleeve and the protective sleeve fixing head, the top of the special screw can be protected, the special protective sleeve is screwed on the top of the special screw, can prevent the special screw from contacting with water and air, improves the anti-corrosion effect of the special screw, the sealing grease layer is arranged on the inner side of the special protective sleeve, so that the sealing property of the connection between the outer side of the special screw and the inner side of the special protective sleeve can be enhanced, can strengthen special nut and special screw and air isolated effect, special nut and the rust-resistant effect of losing of special screw have been strengthened, overall structure is simple, high durability and convenient use, the effectual purpose of screw protection has been realized, avoid the long-time use of screw to damage because of the corrosion of water and air, the life of screw has been improved, the stability of screw to generator main shaft and hydraulic turbine runner connection has been guaranteed, prevent that generator main shaft and hydraulic turbine runner from causing the potential safety hazard at the driven in-process, the availability factor and the result of use of protection device have been improved.
Drawings
FIG. 1 is a schematic view of the present invention;
FIG. 2 is a front view of the connection structure of the runner protection casing of the water turbine according to the structure of the present invention;
FIG. 3 is a top view of the connection structure of the runner body of the water turbine according to the present invention;
FIG. 4 is an enlarged view of the point A in the structure diagram 1 of the present invention;
FIG. 5 is an enlarged view of the point B in the structure of FIG. 1;
fig. 6 is an enlarged view of the position C in the structure diagram 3 of the present invention.
In the figure: 1. a turbine runner body; 2. fixing a law disk; 3. connecting the flange plates; 4. a generator main shaft body; 5. a fixed flange; 6. special screws; 7. a screw head; 8. a special nut; 9. a special protective sleeve; 10. a protective sleeve fixing head; 11. a protective sleeve; 12. a slider; 13. a buffer spring; 14. a limiting arc block; 15. a high density rubber ring pad; 16. a nitrile rubber ring pad; 17. a spring washer; 18. a spring washer; 19. a sealing ring gasket; 20. a lower leak-stopping static ring; 21. hydroturbine runner protective housing.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1-6, a screw protection device for connecting a generator main shaft and a turbine runner in this embodiment includes a turbine runner body 1, a fixed flange 2 is fixedly connected to the top of the turbine runner body 1, a connection flange 3 is movably connected to the top of the fixed flange 2, a generator main shaft body 4 is fixedly connected to the top of the connection flange 3, and a fixing flange 5 is fixedly connected to the top of the generator main shaft body 4.
The inboard swing joint of fixed law dish 2 has special screw 6, and the bottom fixedly connected with screw head 7 of special screw 6, the outside threaded connection of special screw 6 has special nut 8, and the outside threaded connection of special screw 6 has special protective sheath 9, and the top fixedly connected with protective sheath fixed head 10 of special protective sheath 9, the outside swing joint of special protective sheath 9 has lag 11.
Two sliding blocks 12 of inboard fixedly connected with of lag 11, the equal fixedly connected with buffer spring 13 in the outside of two sliding blocks 12, the spacing arc piece 14 of the equal fixedly connected with in the outside of two buffer spring 13, the bottom fixedly connected with high density rubber ring pad 15 of lag 11, high density rubber ring pad 15 and the 3 swing joint of connection method dish, lag 11 are located the outside of special nut 8, the diameter of lag 11 equals with the diameter of high density rubber ring pad 15.
The top of the protecting sleeve 11 is fixedly connected with a nitrile rubber ring pad 16, the nitrile rubber ring pad 16 is movably connected with the special protecting sleeve 9, the nitrile rubber ring pad 16 is located on the outer side of the special protecting sleeve 9, the diameter of the inner side of the nitrile rubber ring pad 16 is equal to that of the outer side of the special protecting sleeve 9, the outer side of the screw head 7 is movably connected with a spring gasket 17, the outer side of the screw head 7 is movably connected with a spring gasket 18, the spring gasket 18 is located between the screw head 7 and the fixed flange 2, and the spring gasket 17 is located between the special nut 8 and the connecting flange 3.
The outside swing joint of screw head 7 has seal ring pad 19, seal ring pad 19 is located between special nut 8 and the special protective sheath 9, the thread groove with 7 outside screw thread looks adaptations of screw head is seted up to the inboard of special protective sheath 9, special nut 8 all with seal ring pad 19 swing joint with special protective sheath 9, leak-stopping quiet ring 20 under the outside fixedly connected with of hydraulic turbine runner body 1, the outside swing joint of lower leak-stopping quiet ring 20 has hydraulic turbine runner protective housing 21, hydraulic turbine runner body 1 is located hydraulic turbine runner protective housing 21's inboard.
The inner side of the special protective sleeve 9 is provided with two sliding long grooves, two sliding blocks 12 are respectively in sliding connection with the two sliding long grooves, the width of each sliding block 12 is equal to that of each sliding long groove, the inner side of the special protective sleeve 9 is provided with two limiting arc grooves, the number of the limiting arc grooves is two, the number of each limiting arc groove is four, the limiting arc grooves are arranged on the inner side of the special protective sleeve 9 at equal intervals, the limiting arc blocks 14 are clamped with the limiting arc grooves, and the top end of the special screw 6 sequentially penetrates through the spring washer 18, the fixing method disc 2, the connecting method disc 3, the spring gasket 17, the special nut 8, the sealing ring gasket 19 and the special protective sleeve 9 and extends to the inner side of the special protective sleeve 9.
The outside of special screw 6 is provided with anticorrosive paint, the screw hole with the 6 outside screw thread looks adaptations of special screw is seted up to the inboard of special nut 8, special screw 6, screw head 7, special nut 8, special protective sheath 9, protective sheath fixed head 10 and lag 11 are made by 304 stainless steel material, the fixed through hole that equals with special screw 6 diameter is all opened to the inboard of fixed law dish 2 and connection law dish 3, special screw 6 is located the inboard of fixed through hole, high density rubber ring fills up 15, the fine rubber ring of butyl fills up 16, spring washer 17, the quantity of spring washer 18 and seal ring pad 19 is design quantity, protective sheath fixed head 10 is the hexagon.
In addition, through setting up special screw 6, screw head 7 and special nut 8, can connect fixed law dish 2 and connection law dish 3, through setting up special protective sheath 9, can completely cut off the protection to the top of special screw 6, through setting up protective sheath fixed head 10, can rotate special protective sheath 9, through setting up lag 11, can completely cut off the protection to special screw 6 and special nut 8, through setting up sliding block 12 and slip elongated slot, can guarantee the gliding effect of lag 11, through setting up buffer spring 13, can make spacing arc piece 14 have the effect of buffering, through setting up spacing arc piece 14 and spacing arc groove, can guarantee the fixed effect of lag 11.
Through setting up high density rubber ring pad 15, can improve the stability between lag 11 and the connection method dish 3, through setting up butadiene acrylonitrile rubber ring pad 16, can improve the stability between lag 11 and the special protective sheath 9, through setting up spring washer 17, can improve the stability that special screw 6 and special nut 8 are connected, through setting up spring washer 18, can improve the stability that special screw 6 is connected.
Through setting up the seal ring pad 19, can improve the leakproofness that special protective sheath 9 and special nut 8 are connected, through setting up lower leak-stopping quiet ring 20 and hydraulic turbine runner protective housing 21, can protect hydraulic turbine runner body 1, through setting up chromium coating, can make the outside of special screw 6 have rust-resistant effect of corroding, through setting up anticorrosive paint, can make the outside of special screw 6 have anticorrosive effect, through setting up the sealing grease layer, can strengthen the leakproofness of being connected in the special screw 6 outside and special protective sheath 9 inboard.
The special protective sleeve 9 is made of 304 stainless steel materials which are specially selected, has the advantages of strong corrosion resistance and high strength, can be made of inexpensive 304 stainless steel, is internally provided with a special sealing grease layer and protected screw matched internal thread in the special protective sleeve 9, and is used for protecting the special screws 6 which are expensive and have extremely high maintenance cost in special places.
The working principle of the above embodiment is as follows:
(1) Through setting up special screw 6, screw head 7 and special nut 8, can connect fixed method dish 2 and connection method dish 3, thereby can be in the same place hydraulic turbine runner body 1 and the stable connection of generator main shaft body 4, avoid hydraulic turbine runner body 1 and generator main shaft body 4 to take place to drop and rusty phenomenon at the in-process of drive, because special screw 6 is made by special material, can prevent special screw 6 cracked phenomenon from appearing, can guarantee the effect of special screw 6 connection, add chromium coating in the outside of special screw 6, can strengthen the anticorrosive effect of special screw 6, set up chromium coating in the outside of special screw 6, can strengthen the rust-resistant purpose that loses of special screw 6.
(2) When needs are carried out isolated protection to special nut 8 and special screw 6, screw up the top at special screw 6 with special protective sheath 9 earlier, then promote lag 11 hard, make buffer spring 13 be in compression state, thereby can make spacing arc piece 14 and the spacing arc groove separation of current joint, make lag 11 lose spacingly, can make high density rubber ring pad 15 and the laminating of joining method dish 3 through promoting lag 11, pass through buffer spring 13's elasticity this moment, can with spacing arc piece 14 propelling movement to the spacing arc groove of current joint, can be spacing again lag 11, thereby can carry out isolated with special nut 8 and special screw 6 completely with the air, realized the rust-resistant mesh of losing of special nut 8 and special screw 6.
(3) Through setting up special protective sheath 9 and protective sheath fixed head 10, can protect the top of special screw 6, tighten up special protective sheath 9 at the top of special screw 6, can prevent that special screw 6 from contacting with water and air, the rust-resistant effect of losing of special screw 6 has been improved, inboard at special protective sheath 9 sets up the sealed fat layer, can strengthen the leakproofness of being connected in the special screw 6 outside and special protective sheath 9 inboard, through setting up lag 11, can strengthen special nut 8 and special screw 6 and the isolated effect of air, special nut 8 and the rust-resistant effect of losing of special screw 6 have been strengthened.
Compared with the prior art, overall structure is simple, facilitates the use, has realized the effectual purpose of screw protection, avoids the long-time use of screw to damage because of the corrosion of water and air, has improved the life of screw, has guaranteed the stability that the screw is connected generator main shaft and hydraulic turbine runner, prevents that generator main shaft and hydraulic turbine runner from causing the potential safety hazard at the driven in-process, has improved protection device's availability factor and result of use.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "...," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The utility model provides a screw protection device for generator spindle and hydraulic turbine runner are connected, includes hydraulic turbine runner body (1), its characterized in that: the top of the water turbine runner body (1) is fixedly connected with a fixing method disc (2), the top of the fixing method disc (2) is movably connected with a connecting method disc (3), the top of the connecting method disc (3) is fixedly connected with a generator main shaft body (4), and the top of the generator main shaft body (4) is fixedly connected with a fixing flange (5);
the inboard swing joint of fixed method dish (2) has special screw (6), the bottom fixedly connected with screw head (7) of special screw (6), the outside threaded connection of special screw (6) has special nut (8), special protective sheath (9) are established to the outside threaded connection of special screw (6), the top fixedly connected with protective sheath fixed head (10) of special protective sheath (9), the outside swing joint of special protective sheath (9) has lag (11).
2. The screw protector for the connection of the main shaft of the generator and the runner of the water turbine as claimed in claim 1, wherein: the special screw (6), the screw head (7), the special nut (8), the special protective sleeve (9), the protective sleeve fixing head (10) and the protective sleeve (11) are arranged equidistantly, the chromium coating is fixedly connected to the outer side of the special screw (6), and the inner side of the special protective sleeve (9) is provided with inner thread matched with the outer side of the special screw (6) and a special sealing grease layer.
3. The screw protector for the connection of the main shaft of the generator and the runner of the water turbine as claimed in claim 1, wherein: two sliding blocks (12) of inboard fixedly connected with of lag (11), two the equal fixedly connected with buffer spring (13) in the outside of sliding block (12), two the equal fixedly connected with spacing arc piece (14) in the outside of buffer spring (13).
4. The screw protector for the connection of the main shaft of the generator and the runner of the water turbine as claimed in claim 1, wherein: the bottom fixedly connected with high density rubber ring pad (15) of lag (11), high density rubber ring pad (15) and connection method dish (3) swing joint, lag (11) are located the outside of special nut (8), the diameter of lag (11) equals with the diameter of high density rubber ring pad (15).
5. The screw protector for the connection of the main shaft of the generator and the runner of the water turbine as claimed in claim 1, wherein: the top fixedly connected with butadiene acrylonitrile rubber ring pad (16) of lag (11), butadiene acrylonitrile rubber ring pad (16) and special protective sheath (9) swing joint, butadiene acrylonitrile rubber ring pad (16) are located the outside of special protective sheath (9), the inboard diameter of butadiene acrylonitrile rubber ring pad (16) equals the outside diameter of special protective sheath (9).
6. The screw protector for the connection of the main shaft of the generator and the runner of the water turbine as claimed in claim 1, wherein: the outside swing joint of screw head (7) has spring washer (17), the outside swing joint of screw head (7) has spring washer (18), spring washer (18) are located between screw head (7) and fixed method dish (2), spring washer (17) are located between special nut (8) and connection method dish (3).
7. The screw protector for the connection of the main shaft of the generator and the runner of the water turbine as claimed in claim 1, wherein: the outside swing joint of screw head (7) has sealing ring pad (19), sealing ring pad (19) are located between special nut (8) and special protective sheath (9), the thread groove with screw head (7) outside screw thread looks adaptation is seted up to the inboard of special protective sheath (9).
8. The screw protection device for the connection of the main shaft of the generator and the runner of the water turbine as claimed in claim 1, wherein: the outer side fixedly connected with of hydraulic turbine runner body (1) is lower leak-stopping quiet ring (20), the outside swing joint of lower leak-stopping quiet ring (20) has hydraulic turbine runner protective housing (21), hydraulic turbine runner body (1) is located the inboard of hydraulic turbine runner protective housing (21).
9. A screw protector for a generator main shaft and turbine runner connection as claimed in claim 3, wherein: the inner side of the special protective sleeve (9) is provided with two sliding long grooves, the two sliding blocks (12) are respectively in sliding connection with the two sliding long grooves, and the width of each sliding block (12) is equal to that of each sliding long groove.
10. A screw protector for a generator main shaft and turbine runner connection as claimed in claim 3, wherein: spacing arc groove has been seted up to the inboard of special protective sheath (9), the quantity in spacing arc groove is two sets of, every group the quantity in spacing arc groove is four, spacing arc groove is the equidistance in the inboard of special protective sheath (9) and arranges, spacing arc piece (14) and spacing arc groove joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223417361.5U CN218882823U (en) | 2022-12-20 | 2022-12-20 | Screw protection device for connecting main shaft of generator and rotating wheel of water turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223417361.5U CN218882823U (en) | 2022-12-20 | 2022-12-20 | Screw protection device for connecting main shaft of generator and rotating wheel of water turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218882823U true CN218882823U (en) | 2023-04-18 |
Family
ID=85978469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223417361.5U Active CN218882823U (en) | 2022-12-20 | 2022-12-20 | Screw protection device for connecting main shaft of generator and rotating wheel of water turbine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218882823U (en) |
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2022
- 2022-12-20 CN CN202223417361.5U patent/CN218882823U/en active Active
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