Piston type main shaft sealing structure based on water turbine

Abstract

The utility model relates to the field of water turbines, and particularly discloses a piston type main shaft sealing structure based on a water turbine, which is characterized by comprising a water turbine large shaft, one side of the water turbine large shaft is fixedly connected with a water turbine large shaft flange, and the other side of the water turbine large shaft is fixedly connected with a piston. A rotating ring is arranged on the water turbine large shaft flange, and an overhauling shroud ring cover plate and a top cover are further arranged at the edge position of the water turbine large shaft flange. The four lubricating water holes with the diameter of 5mm are symmetrically formed in the rubber piston, and the matched holes are formed in the piston inner ring, so that sufficient and uniform downward pressure is generated on the upper part of the rubber piston, the sealing effect of the rubber piston is improved, and the service life of the rubber piston is prolonged. And meanwhile, the lubricating water hole and the guide hole are effectively prevented from being easily blocked by water scales and microorganisms, and the situation of water leakage from the flange of the large shaft of the water turbine is effectively reduced, so that the problem that a plant is flooded by water is avoided.

Description

Technical Field

[0001] The utility model belongs to the field of water turbines, in particular to a piston-type main shaft sealing structure based on water turbines. Background Art

[0002] A hydraulic turbine is a power machine that converts the energy of water flow into rotational mechanical energy. The main shaft seal of the hydraulic turbine is a very important component of the hydraulic turbine system. Its main functions are to prevent water leakage, protect the guide bearing, reduce energy loss, prevent external impurities from entering, and maintain system stability.

[0003] During the operation of the current main shaft sealing structure, due to the large design size of the lubrication water holes and guide holes, effective working pressure cannot be formed, resulting in a large gap between the sealing block and the rotating ring, leading to poor working sealing effect, and thus causing increased water leakage. At the same time, because the main shaft sealing rubber piston of the unit does not fall into place after the top rotor, it is easy to cause a large gap between the sealing block and the rotating ring, resulting in increased water leakage, posing a major safety hazard of flooding the plant. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a turbine piston-type main shaft sealing structure to solve the problems in the prior art that the lubrication water holes and guide holes are too large, resulting in insufficient downward water pressure, and the rubber piston of the unit fails to fall into place after the top rotor, resulting in excessive gap between the sealing block and the rotating ring, resulting in poor working sealing effect.

[0005] A main shaft sealing structure based on a water turbine piston type, comprising: a main shaft of a water turbine, a main shaft flange of a water turbine fixedly connected to one side of the main shaft of the water turbine, a rotating ring is arranged on the main shaft flange of the water turbine, an inspection belt cover plate and a top cover are also arranged at the edge position of the main shaft flange of the water turbine, an inspection air belt is arranged in the area formed by the connection between the inspection belt cover plate and the top cover, an outer piston ring is fixedly connected to the inspection belt cover plate, an inner piston ring is fixedly installed on the outer piston ring, a rubber piston is also arranged in the area formed by the inner piston ring and the outer piston ring, a drain pipe is also fixedly connected to the outer side of the outer piston ring, the drain pipe can discharge the leakage water generated by the main shaft seal, and a clean water source water inlet pipe and a water inlet ring pipe are also installed on the outer side of the inner piston ring;

[0006] The rubber piston is symmetrically provided with four lubricating water holes with a diameter of 5 mm, the piston inner ring is provided with matching holes, and the piston inner ring and the rubber piston are also connected through a limit pin.

[0007] Preferably, the clean water source inlet pipe is also provided with an industrial gas inlet pipe, and the industrial gas inlet pipe is provided with a one-way valve.

[0008] Preferably, the upper end of the main shaft of the turbine is fixedly connected to the generator, and the lower end of the main shaft of the turbine is fixedly connected to the turbine via a main shaft flange.

[0009] Preferably, the inspection belt cover is fixedly mounted on the top cover.

[0010] Compared with the prior art, the utility model has the following beneficial effects: by symmetrically opening four lubricating water holes with a diameter of 5 mm on the rubber piston and setting matching holes on the inner ring of the piston, it is ensured that sufficient and uniform downward pressure is generated on the upper part of the rubber piston, thereby improving the sealing effect of the rubber piston, and effectively avoiding the lubricating water holes and guide holes from being easily blocked by scale and microorganisms, effectively reducing water leakage from the flange of the main shaft of the turbine, thereby avoiding the occurrence of the problem of flooding the factory building; through the newly added industrial air pipe, the defect of the rubber piston not falling into place after the unit is about to push the rotor is completely solved, ensuring that the rubber piston and the rotating ring can be reliably sealed, avoiding the serious problem of water leakage caused by the rubber piston not falling into place. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0012] Figure 2 It is a structural schematic diagram of the rubber piston of the utility model.

[0013] In the figure: 1. turbine main shaft; 2. turbine main shaft flange; 3. swivel; 4. maintenance belt cover; 5. top cover; 6. maintenance air belt; 7. piston outer ring; 8. piston inner ring; 9. rubber piston; 10. limit pin; 11. drain pipe; 12. clean water source inlet pipe; 13. water inlet ring pipe; 14. industrial air inlet pipe; 15. one-way valve. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0015] like Figure 1 to Figure 2 As shown:

[0016] Embodiment 1: The utility model provides a turbine piston-type main shaft sealing structure, comprising: a turbine piston-type main shaft sealing structure, characterized in that it comprises: a turbine main shaft 1, a turbine main shaft flange 2 is fixedly connected to one side of the turbine main shaft 1, a rotating ring 3 is arranged on the turbine main shaft flange 2, an inspection belt cover plate 4 and a top cover 5 are also arranged at the edge position of the turbine main shaft flange 2, an inspection air belt 6 is arranged in the area formed by the connection between the inspection belt cover plate 4 and the top cover 5, a piston outer ring 7 is fixedly connected to the inspection belt cover plate 4, a piston inner ring 8 is fixedly installed on the piston outer ring 7, a rubber piston 9 is also arranged in the area formed by the piston inner ring 8 and the piston outer ring 7, a drain pipe 11 is also fixedly connected to the outside of the piston outer ring 7, the drain pipe 11 can discharge the leakage water generated by the main shaft seal, and a clean water source water inlet pipe 12 and a water inlet ring pipe 13 are also installed on the outside of the piston inner ring 8;

[0017] Four lubricating water holes with a diameter of 5 mm are symmetrically opened on the rubber piston 9 , and matching holes are arranged on the piston inner ring 8 . A limit pin 10 is also penetrated and connected on the piston inner ring 8 and the rubber piston 9 .

[0018] As can be seen from the above, when the main shaft 1 of the turbine is running, the rubber piston 9 forms a sealed chamber between the piston inner ring 8 and the piston outer ring 7. When the main shaft 1 of the turbine rotates, a dynamic seal is formed between the rubber piston 9 and the swivel 3, which effectively prevents water from leaking from the gap between the main shaft and the swivel; the four lubricating water holes with a diameter of 5 mm symmetrically opened on the rubber piston 9 match the holes on the piston inner ring 8 to form a lubricating water channel, and the clean water source inlet pipe 12 supplies clean water to these holes through the water inlet ring pipe 13, which plays a role in lubricating and cooling the rubber piston 9, ensuring its long-term stable operation; the limit pin 10 runs through the piston inner ring 8 and the rubber piston 9, playing a role of fixing and limiting, which ensures that the rubber piston 9 is under water pressure It will not leave its working position when being repaired, and at the same time prevent the rubber piston 9 from making circular motion and being deformed or damaged; the drain pipe 11 is arranged on the outside of the piston outer ring 7, and is used to discharge the leakage water generated by the main shaft seal. The drain pipe 11 discharges the leakage water in time to prevent it from accumulating inside the sealing structure and affecting the sealing effect; the maintenance air belt 6 is arranged in the area formed by the connection between the maintenance belt cover plate 4 and the top cover 5, and is used to isolate the main shaft sealing area during maintenance to prevent water from entering. By introducing an industrial air source into the maintenance air belt 6, the maintenance air belt 6 can be contacted and sealed with the turbine main shaft flange 2, thereby blocking the water from entering the main shaft sealing structure, and the main shaft sealing structure can be easily inspected and maintained.

[0019] Embodiment 2: This embodiment is basically the same as the previous embodiment, except that an industrial gas inlet pipe 14 is also provided on the clean water source inlet pipe 12, and a one-way valve 15 is provided on the industrial gas inlet pipe 14.

[0020] Specifically, the upper end of the turbine main shaft 1 is fixedly connected to the generator, and the lower end of the turbine main shaft 1 is fixedly connected to the turbine through the turbine main shaft flange 2 .

[0021] Specifically, the maintenance belt cover plate 4 is fixedly installed on the top cover 5.

[0022] As can be seen from the above, the main shaft 1 of the turbine is a key connecting component between the turbine and the generator, and its upper end is fixedly connected to the generator, and the lower end of the main shaft 1 is fixedly connected to the turbine through the main shaft flange 2, ensuring that the turbine can drive the main shaft to rotate when it rotates, and then drive the generator; when it is necessary to enter the main shaft sealing structure for inspection or maintenance, the industrial air source is introduced into the inspection air belt 6, so that the inspection air belt 6 and the main shaft flange 2 can be contact-sealed, thereby blocking the water flow from entering the main shaft sealing structure; through the newly-added industrial air pipe 14 and the one-way valve 15, the defect that the rubber piston 9 does not fall into place after the unit is about to push the rotor is completely solved, ensuring that the rubber piston 7 falls into place together with the swivel 3, and ensuring that the gap between the rubber piston 9 and the swivel 3 meets the operating requirements. Reliable sealing is achieved to avoid the serious problem of water leakage caused by the rubber piston 9 not falling into place.

[0023] Embodiment 3: This embodiment is basically the same as the previous embodiment, except that the clean water source inlet ring pipe 13 is arranged in a semicircular shape along the piston inner ring 8 .

[0024] Specifically, the clean water source inlet pipe 12 and the industrial gas pipe 14 are connected to two symmetrically arranged water inlets of the piston inner ring 8 through the water inlet ring pipe 13 .

[0025] As can be seen from the above, the working water pipeline of the main shaft seal passes through the water inlet ring pipe 13 arranged in a semicircle on the piston inner ring 8, which shortens the length of the connected pipeline, reduces the loss of water inlet pressure along the pipeline, ensures the consistency of water inlet pressure of the two symmetrically arranged water inlets of the piston inner ring 8, ensures that the upper part of the rubber piston 9 is evenly stressed, and the working water pressure is stable, so that the working gap between the rubber piston 9 and the swivel 3 meets the operating requirements, and plays a reliable sealing and lubrication role.

[0026] The standard parts used in this utility model can be purchased from the market, and the special-shaped parts can be customized according to the description and the drawings. The specific connection methods of each part adopt the conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt the conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0027] In the description of the present utility model, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. The meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0030] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0031] In the drawings of the embodiments disclosed in the present utility model, only the structures related to the embodiments disclosed in the present utility model are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present utility model can be combined with each other.

[0032] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A turbine piston-type main shaft sealing structure, characterized in that: include: A turbine main shaft (1), one side of the turbine main shaft (1) is fixedly connected to a turbine main shaft flange (2), a rotating ring (3) is arranged on the turbine main shaft flange (2), an inspection belt cover plate (4) and a top cover (5) are also arranged at the edge of the turbine main shaft flange (2), an inspection air belt (6) is arranged in the area formed by the connection between the inspection belt cover plate (4) and the top cover (5), and a maintenance belt cover plate (4) is fixedly connected to the maintenance belt cover plate (4). A piston outer ring (7), a piston inner ring (8) is fixedly mounted on the piston outer ring (7), a rubber piston (9) is also arranged in the area formed by the piston inner ring (8) and the piston outer ring (7), a drainage pipe (11) is also fixedly connected to the outside of the piston outer ring (7), and the drainage pipe (11) can discharge the leakage water generated by the main shaft seal, and a clean water source inlet pipe (12) and a water inlet ring pipe (13) are also installed on the outside of the piston inner ring (8); The rubber piston (9) is symmetrically provided with four lubricating water holes with a diameter of 5 mm, the piston inner ring (8) is provided with matching holes, and the piston inner ring (8) and the rubber piston (9) are also connected through a limit pin (10).

2. A turbine piston-type main shaft sealing structure as claimed in claim 1, characterized in that: The clean water source inlet pipe (12) is also provided with an industrial gas inlet pipe (14), and the industrial gas inlet pipe (14) is provided with a one-way valve (15).

3. A turbine piston-type main shaft sealing structure as claimed in claim 1, characterized in that: The upper end of the turbine main shaft (1) is fixedly connected to the generator, and the lower end of the turbine main shaft (1) is fixedly connected to the turbine via a turbine main shaft flange (2).

4. A turbine piston-type main shaft sealing structure as claimed in claim 3, characterized in that: The inspection belt cover plate (4) is fixedly mounted on the top cover (5).

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