Water seal system applied to water turbine generator set without additional water source

Abstract

The application discloses a water seal system applied to a water-turbine generator set without an external water source, and belongs to the technical field of water-turbine generator sets. The water seal system comprises a maintenance seal, at least one pressure reducing device, a terminal sealing device and a water collecting and draining device which are sequentially arranged along a main shaft of the water-turbine generator set. Through the arrangement, the water-turbine generator set does not need an external water source, and a water sealing process is completed step by step by relying on natural water pressure, without the need of additionally adding water supply equipment and designing a double-path water supply system. The water seal system not only reduces the cost of the whole water seal system, but also reduces the maintenance workload of the water supply system in daily operation. Meanwhile, the water seal system avoids the water seal failure risk caused by the interruption of the external water source from the root, improves the stability and reliability of the water-turbine generator set operation, realizes simple structure and strong adaptability, can effectively reduce the initial construction investment, and can also avoid the design of complex pipelines and the occupation of a large amount of space.

Description

Technical Field

[0001] This invention relates to the field of hydro-generator technology, specifically to a water seal system for hydro-generators without an external water source. Background Technology

[0002] Hydropower generator sets are the core equipment for hydropower generation. Their main shaft seal is a key component to ensure the safe and stable operation of the unit. The main function of the water seal is to prevent pressurized water in the unit's flow channel from entering the hydropower generator set through the gap between the main shaft and the support components, thus preventing damage to the turbine components and the generator insulation.

[0003] Currently, the water seal system in hydro-generator units usually relies on an external clean pressurized water source. Specifically, a dual-supply system is arranged in the hydro-generator unit. Its basic working principle is to introduce clean pressurized water from the outside and inject it into the sealed cavity to form a water curtain or water ring with a pressure higher than that inside the unit, thereby preventing river water containing silt from entering the unit.

[0004] However, to realize a dual-supply system, two separate water intake, filtration, pressurization and transmission pipeline systems must be built, and corresponding valves, instruments and control units must be equipped. This not only significantly increases the initial construction investment of the hydropower station, but also makes the pipeline layout complex and occupies a lot of space. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide a water seal system for hydro-generator sets without an external water source, so as to solve the technical problems in the prior art where the existing water seal system adopts a dual water supply system, which increases the initial construction investment and also makes the pipeline layout complex and occupies a lot of space.

[0006] According to an embodiment of the present invention, a water seal system for a hydro-generator set without an external water source is provided. The hydro-generator set includes a main shaft of the unit, and the water seal system includes a maintenance seal, at least one pressure reducing device, an end sealing device, and a collection and drainage device arranged sequentially along the main shaft of the unit. The pressure reducing device is used to reduce the pressure of the high-pressure water source that has passed through the maintenance seal, and the pressure-reduced water source is sealed by the end sealing device. The collection and drainage device is located downstream of the end sealing device and is used to collect the water source that leaks through the end sealing device and discharge it to the outside of the unit's main shaft.

[0007] Furthermore, the maintenance seal, the pressure reducing device, the end sealing device, and the drainage device are connected sequentially along the water flow direction and together form a sealed channel.

[0008] Furthermore, the water seal system also includes a body; The maintenance seal, the pressure reducing device, the end sealing device, and the drainage device are all sleeved around the main shaft of the unit through the body. Furthermore, the pressure reducing device includes a comb-tooth sealing seat and a comb-tooth sealing element; The comb-tooth seal is detachably connected to the body of the machine via the comb-tooth seal seat.

[0009] Furthermore, the end sealing device includes a pressure plate and a flat sealing element; The flat plate seal is disposed between one end of the pressure plate and part of the side wall of the machine body. The pressure plate is detachably connected to the machine body. The pressure plate is used to apply pressure to the flat plate seal, so that the opposite sides of the pressure plate are tightly fitted to the opposite side walls of the machine body and the pressure plate, respectively.

[0010] Furthermore, the drainage device includes a drain pipe and a water collection tank; The water collection tank is used to collect water that leaks through the end sealing device, and the drain pipe is used to discharge the water in the water collection tank to the outside of the unit's main shaft. Furthermore, the water collection and drainage device also includes a water-throwing ring, wherein the water-throwing ring is disposed between the water collection tank and the end sealing device.

[0011] In summary, the beneficial effects of the present invention are as follows: The water seal system provided by this invention includes a maintenance seal, at least one pressure reducing device, an end sealing device, and a collection and drainage device arranged sequentially along the main shaft of the generator unit. The pressure reducing device in the water seal system reduces the pressure of the high-pressure water source. The water source after pressure reduction is sealed by the end sealing device, and the water leaking from the end sealing device is collected and discharged outside the main shaft of the generator unit through the collection and drainage device. With this configuration, the hydro-generator unit does not need an external water source and can complete the water sealing process step by step by relying on natural water pressure. There is no need to add additional water supply equipment or design a dual water supply system. This not only reduces the cost of the entire water seal system, but also reduces the maintenance workload of the water supply system during daily operation. At the same time, it avoids the risk of water seal failure caused by the interruption of the external water source, and improves the stability and reliability of the hydro-generator unit operation. Compared with the traditional dual water supply system that requires an external clean pressure water source, the water seal system of this application has a simple structure and strong adaptability, which can effectively reduce the initial construction investment, and can also avoid designing complex pipelines and occupying a lot of space. Attached Figure Description

[0012] Fig. 1 This is a schematic diagram of the overall structure of the water seal system of the present invention from one perspective; Fig. 2 This is a schematic diagram of the overall structure of the water seal system of the present invention from another perspective.

[0013] Attached reference numerals: 1. Main shaft of the unit; 2. Maintenance seal; 3. Comb tooth seal seat; 4. Comb tooth seal; 5. Flat plate seal; 6. Pressure plate; 7. Water-throwing ring; 8. Water collection tank; 9. Drain pipe; 10. Machine body. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this application clearer, the application is described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments presented in this application without inventive effort are within the scope of protection of this application.

[0015] Obviously, the accompanying drawings described below are merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar scenarios based on these drawings without any inventive effort. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, any changes to design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as insufficient disclosure of the content of this application.

[0016] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0017] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms “a,” “an,” “an,” “the,” and similar words used in this application do not indicate quantity limitation and may indicate singular or plural. The terms “comprising,” “including,” “having,” and any variations thereof used in this application are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or modular units is not limited to the listed steps or units, but may also include steps or units not listed, or may include other steps or units inherent to these processes, methods, products, or devices. The terms “connected,” “linked,” “coupled,” and similar words used in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. “Multiple” used in this application refers to two or more. “And / or” describes the relationship between related objects, indicating that three relationships may exist; for example, “A and / or B” can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following objects are in an "or" relationship. The terms "first," "second," and "third" used in this application are merely to distinguish similar objects and do not represent a specific ordering of the objects.

[0018] Example Please see Figs. 1-2 The figure shows a water seal system for a hydro-generator unit without an external water source according to the present invention. The hydro-generator unit includes the main shaft 1. It should be noted that in some actual situations, the hydro-generator unit is not limited to the main shaft 1, and may also include other components constituting the hydro-generator unit. Since the hydro-generator unit is conventional prior art in this field, other components will not be specifically described here.

[0019] To address the technical issues that existing water seal systems employ dual water supply systems, which increase initial construction investment, complicate pipeline layout, and occupy a large amount of space, the water seal system in this application specifically includes a maintenance seal 2, at least one pressure reducing device, an end sealing device, and a drainage collection and drainage device arranged sequentially along the main shaft 1 of the unit. The pressure reducing device is used to reduce the pressure of the high-pressure water source after the maintenance seal 2, and seals the water source after pressure reduction through the end sealing device. The collection and drainage device is located downstream of the end sealing device and is used to collect the water source that leaks through the end sealing device and discharge it to the outside of the unit's main shaft 1.

[0020] When the hydro-generator unit is running, the maintenance seal 2 will be out of service, and will be in a non-contact state with the main shaft 1 of the unit. A gap or flow channel exists between the maintenance seal 2 and the main shaft 1, through which high-pressure water from the outside will directly enter the water seal system. The pressure-reducing device in the water seal system will reduce the pressure of the high-pressure water. The reduced-pressure water will then be sealed by the end seal device. Water leaking from the end seal device will be collected and discharged outside the main shaft 1 through a collection and drainage device. This design allows the hydro-generator unit to operate without an external water source, relying on natural water flow. The water sealing process is completed in stages, eliminating the need for additional water supply equipment or a dual-supply system. This not only reduces the overall cost of the water seal system but also decreases the workload of daily water supply system maintenance. Furthermore, it fundamentally avoids the risk of water seal failure caused by external water source interruption, thus improving the stability and reliability of the hydro-generator unit. Compared to traditional dual-supply systems that require an external clean pressure water source, the water seal system of this application has a simple structure and strong adaptability, effectively reducing initial construction investment. It also avoids the need for complex pipeline design and avoids occupying a large amount of space.

[0021] Specifically, in this application, the maintenance seal 2, the pressure reducing device, the end sealing device, and the drainage device are connected in sequence along the water flow direction and together form a sealed channel.

[0022] Furthermore, to facilitate the assembly of the maintenance seal 2, pressure reducing device, end sealing device, and drainage device, in this embodiment, the water seal system also includes a body 10. The maintenance seal 2, pressure reducing device, end sealing device, and drainage device are all sleeved around the main shaft 1 of the unit through the body 10.

[0023] Furthermore, the pressure reducing device includes a comb-tooth sealing seat 3 and a comb-tooth sealing element 4. The comb-tooth sealing element 4 is detachably connected to the machine body 10 via the comb-tooth sealing seat 3. Specifically, the comb-tooth sealing seat 3 is fixedly installed inside the machine body 10, and the comb-tooth sealing element 4 is assembled onto the comb-tooth sealing seat 3. By designing the comb-tooth sealing element 4 and the comb-tooth sealing seat 3 to be detachably connected, for example using a bolted connection, the inspection, replacement, or maintenance of the comb-tooth sealing element 4 is greatly facilitated without disassembling the entire machine body 10 or large components. It should be noted that the comb-tooth sealing element 4 can reduce the pressure of a high-pressure water source, which is a conventional function of the comb-tooth sealing element 4 and will not be specifically described here.

[0024] The end sealing device includes a pressure plate 6 and a flat seal 5. The flat seal 5 is located between one end of the pressure plate 6 and a portion of the side wall of the body 10. The pressure plate 6 is detachably connected to the body 10. The pressure plate 6 applies pressure to the flat seal 5, causing the opposite sides of the pressure plate 6 to fit tightly against the opposite side walls of the body 10 and the pressure plate 6, respectively. Specifically, the flat seal 5 is positioned in the space formed between one end of the pressure plate 6 and a portion of the inner side wall of the body 10. The pressure plate 6 is detachably connected to the body 10 by bolts or other fasteners. When the pressure plate 6 is tightened, it applies an axial clamping force to the flat seal 5 in the middle. This pressure forces the opposite sides of the flat seal 5 to fit tightly against the inner side wall of the body 10 and the end face of the pressure plate 6, respectively, thus forming a reliable end-face contact main seal, effectively blocking the water source from the pressure reducing device.

[0025] The water collection and drainage device includes a drain pipe 9, a water collection tank 8, and a water-throwing ring 7. The water collection tank 8 is used to collect water leaking through the end sealing device, and the drain pipe 9 is used to discharge the water in the water collection tank 8 to the outside of the unit's main shaft 1. The water-throwing ring 7 is located between the water collection tank 8 and the end sealing device. Specifically, the water collection tank 8 is as follows: Fig. 2 As shown, for example, an annular trough is installed inside (i.e., downstream) of the end sealing device to collect a small amount of water that leaks through the end face of the end sealing device. The drain pipe 9 is connected to the bottom or lower side of the water collection tank 8 to guide and discharge the collected water to the outside of the unit's main shaft 1. In order to more effectively prevent water droplets that spread along the axial surface of the unit's main shaft 1 from entering areas that should not be waded into, and to form favorable flow conditions at the inlet of the water collection tank 8, this embodiment adds a water-throwing ring 7 between the end sealing device and the water collection tank 8. The centrifugal force generated by the water-throwing ring 7 throws out the water droplets that crawl along the axial surface and projects them into the outer water collection tank 8, thereby enhancing the sealing and drainage effect of the entire system.

[0026] In summary, the water seal system for hydro-generator sets without an external water source, provided by an embodiment of the present invention, has at least the following advantages compared to traditional dual-supply systems: The water seal system provided by this invention includes a maintenance seal 2, at least one pressure reducing device, an end sealing device, and a collection and drainage device arranged sequentially along the main shaft 1 of the generator unit. The pressure reducing device in the water seal system reduces the pressure of the high-pressure water source. The water source after pressure reduction is sealed by the end sealing device, and the water source leaking from the end sealing device is collected and discharged outside the main shaft 1 of the generator unit through the collection and drainage device. With this configuration, the hydro-generator unit does not need an external water source and can complete the water sealing process step by step by relying on natural water pressure. There is no need to add additional water supply equipment or design a dual water supply system. This not only reduces the cost of the entire water seal system, but also reduces the maintenance workload of the water supply system during daily operation. At the same time, it avoids the risk of water seal failure caused by the interruption of the external water source, and improves the stability and reliability of the hydro-generator unit operation. Compared with the traditional dual water supply system that requires an external clean pressure water source, the water seal system of this application has a simple structure and strong adaptability, which can effectively reduce the initial construction investment, and also avoids the design of complex pipelines and avoids occupying a lot of space.

[0027] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0028] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A water seal system for a hydro-generator unit without an external water source, the hydro-generator unit including a main shaft, characterized in that, The water seal system includes a maintenance seal, at least one pressure reducing device, an end sealing device, and a collection and drainage device arranged sequentially along the main shaft of the unit. The pressure reducing device is used to reduce the pressure of the high-pressure water source that has passed through the maintenance seal, and the pressure-reduced water source is sealed by the end sealing device. The collection and drainage device is located downstream of the end sealing device and is used to collect the water source that leaks through the end sealing device and discharge it to the outside of the unit's main shaft.

2. A water seal system for a hydro-generator unit without an external water source, as described in claim 1, is characterized in that: The maintenance seal, the pressure reducing device, the end sealing device, and the drainage device are connected sequentially along the water flow direction and together form a sealed channel.

3. A water seal system for a hydro-generator unit without an external water source, as described in claim 1, is characterized in that: The water seal system also includes a machine body; The maintenance seal, the pressure reducing device, the end sealing device, and the drainage device are all sleeved around the main shaft of the unit through the body.

4. A water seal system for a hydro-generator unit without an external water source, as described in claim 3, is characterized in that: The pressure reducing device includes a comb-tooth sealing seat and a comb-tooth sealing element; The comb-tooth seal is detachably connected to the body of the machine via the comb-tooth seal seat.

5. A water seal system for a hydro-generator unit without an external water source, as described in claim 3, is characterized in that: The end sealing device includes a pressure plate and a flat sealing element; The flat plate seal is disposed between one end of the pressure plate and part of the side wall of the machine body. The pressure plate is detachably connected to the machine body. The pressure plate is used to apply pressure to the flat plate seal, so that the opposite sides of the pressure plate are tightly fitted to the opposite side walls of the machine body and the pressure plate, respectively.

6. A water seal system for a hydro-generator unit without an external water source, as described in claim 3, is characterized in that: The drainage system includes a drain pipe and a water collection tank; The water collection tank is used to collect water that leaks through the end sealing device, and the drain pipe is used to discharge the water in the water collection tank to the outside of the unit's main shaft.

7. A water seal system for a hydro-generator unit without an external water source, as described in claim 6, is characterized in that... The water collection and drainage device further includes a water-throwing ring, wherein the water-throwing ring is disposed between the water collection tank and the end sealing device.

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