A shaft sleeve sealing structure in a hydraulic turbine

Abstract

The utility model provides a kind of water turbine middle shaft sleeve sealing structure, belong to shaft sleeve sealing technical field, including shaft sleeve and the rotating shaft rotationally connected with shaft sleeve, the outer arc surface of rotating shaft is equipped with hoop, and the outer surface end surface of shaft sleeve is equipped with I-shaped recess, and the inside of I-shaped recess is equipped with sealing part, and sealing part is used to fill the rotating gap between rotating shaft and shaft sleeve, the sealing part includes the connecting ring rotationally connected with the outer surface end surface of shaft sleeve, the inner diameter of connecting ring is greater than the outer diameter of rotating shaft, and there is proper gap between connecting ring and rotating shaft, adapt to the slight displacement when rotating, reduce friction and abrasion, improve rotating flexibility, for the problem that bolt fixation leads to impact stress cannot be solved in rotating sealing structure, the utility model can realize self-adapting sealing while avoiding using bolt to be fixed by using waterproof flexible material.

Description

Technical Field

[0001] This utility model relates to the field of shaft sleeve sealing technology, specifically to a shaft sleeve sealing structure for a water turbine. Background Technology

[0002] Pengshui Hydropower Station is located on the lower reaches of the Wujiang River. It is the 10th of the 12-stage development of the Wujiang Hydropower Base. Its upstream is Shatuo Hydropower Station and its downstream is Yinpan Hydropower Station.

[0003] Pumped storage hydropower stations boast large energy storage capacity, high storage and release efficiency, flexible operation, and rapid response. They can effectively complement new energy sources and are currently recognized as the safest, most stable, and most mature energy storage method, playing a crucial role in promoting the use of new energy sources and improving the overall system performance. Pumped storage units combine pumping and power generation functions, typically undertaking peak shaving, valley filling, and emergency backup tasks in the power grid, while also performing frequency regulation and phase regulation tasks.

[0004] Chinese patent CN220769613U discloses a sealing structure for the guide vane bushing of a water pump turbine, which is used to achieve a sealing effect at the rotating connection between the shaft and the bushing.

[0005] However, the above-mentioned publicly available solutions have the following shortcomings: In actual use, the above solutions use bolted connections to resist hydraulic pressure. Over a long period of use, this will cause a large amount of stress to accumulate in the bolt structure, which will lead to the bolt breaking in the bolt hole.

[0006] This utility model proposes a sealing structure for the shaft sleeve of a water turbine to solve the above-mentioned problems. Utility Model Content

[0007] The purpose of this invention is to use a waterproof and flexible material to seal the rotating shaft, and to achieve an adaptive sealing effect by using water pressure through a beveled sealing method, thereby avoiding the use of bolt fixing structures and overcoming the problems in the background art.

[0008] Based on the above technical concept, the technical solution adopted by this utility model is as follows:

[0009] A turbine shaft sleeve sealing structure includes a shaft sleeve and a rotating shaft rotatably connected to the shaft sleeve. A clamp is installed on the outer arc surface of the rotating shaft, and an I-shaped groove is provided on the outer end face of the shaft sleeve. A sealing part is installed inside the I-shaped groove, and the sealing part is used to fill the rotation gap between the rotating shaft and the shaft sleeve.

[0010] Further defining the above technical solution, the sealing part includes a connecting ring that is rotatably connected to the outer surface end face of the bushing. The inner diameter of the connecting ring is larger than the outer diameter of the rotating shaft. There is an appropriate gap between the connecting ring and the rotating shaft to accommodate small displacements during rotation, reduce friction and wear, and improve rotational flexibility.

[0011] Further defining the above technical solution, the connecting ring is integrally formed and fixed with an installation protrusion on the side near the bushing. The installation protrusion is divided into two parts. The wall thickness of the part near the connecting ring is smaller than that of the part away from the connecting ring, which enhances the flexibility and adaptability of the installation protrusion. The thin-walled part is easy to deform to fill the groove, while the thick-walled part provides support and improves installation stability.

[0012] Further defining the above technical solution, the mounting protrusion is a flexible structure. The mounting protrusion is installed and filled inside the I-shaped groove. The flexible material tightly fills the groove to form an elastic seal, which compensates for component wear or deformation and ensures a long-term sealing effect.

[0013] Further defining the above technical solution, the inner arc surface of the connecting ring is integrally formed with a conical sealing element. The conical sealing element is a conical ring. The inner arc surface of the conical sealing element contacts and presses against the outer arc surface of the rotating shaft. The conical design increases the sealing contact area, and the tight fit is achieved through compression, thereby improving the sealing performance. It is especially suitable for high-pressure environments to prevent water penetration.

[0014] Further defining the above technical solution, the conical seal is inclined toward the center of the rotating shaft, the surface of the conical seal is provided with a waterproof layer, the contact height between the connecting ring and the conical seal is consistent, the inclined structure utilizes water pressure to guide the sealing surface, enhancing the self-adaptive sealing; the waterproof layer improves water resistance; the consistent height ensures uniform force distribution and avoids local stress.

[0015] Further defining the above technical solution, the top of the connecting ring is provided with several friction protrusions that are evenly spaced and circumferentially distributed. The top of the friction protrusions contacts the bottom of the clamp. The friction protrusions increase the frictional resistance with the clamp and prevent the sealing part from accidentally shifting. The uniform distribution improves stability and is suitable for high-speed rotation scenarios.

[0016] Further defining the above technical solution, a gap is provided at the rotatable connection between the rotating shaft and the bushing, and the conical seal is placed on top of the gap to fully cover the rotating gap, forming a double sealing barrier; preventing impurities from entering, reducing wear, and improving the overall protection level of the structure.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. The sealing at the rotating connection between the shaft and the bushing is achieved through components such as the I-shaped groove, sealing parts (including connecting rings, mounting protrusions, conical seals, etc.), and clamps. The core innovation lies in the use of flexible materials and a beveled sealing design, utilizing water pressure to achieve self-adaptive sealing, thereby overcoming the problem of stress fracture easily caused by traditional bolt structures;

[0019] 2. By using waterproof flexible materials (such as the sealing part) and the beveled design of the conical seal, the sealing contact pressure is automatically adjusted by water pressure to achieve dynamic adaptive sealing, reduce the risk of leakage, abandon the bolt fixing method, and adopt the I-shaped groove and flexible installation structure to eliminate the breakage problem caused by bolt stress and extend the service life.

[0020] 3. The overall design is compact, and the components are integrally molded (such as connecting rings and conical seals), which reduces the complexity of assembly and facilitates maintenance and replacement. The friction protrusions and waterproof layer design improve the frictional stability and waterproof effect between components, making it suitable for high-pressure environments in water turbines. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of this application;

[0023] Figure 2 for Figure 1 A sectional view;

[0024] Figure 3 This is a schematic diagram of the friction protrusion in this application;

[0025] Figure 4 This is a schematic diagram of the conical seal in this application.

[0026] Among them, 1. bushing; 2. rotating shaft; 3. clamp; 4. sealing part; 401. connecting ring; 402. mounting protrusion; 403. conical seal; 404. friction protrusion; 5. I-shaped groove. Detailed Implementation

[0027] The present application will be further described in detail below with reference to the accompanying drawings.

[0028] Reference Figure 1 and Figure 2 This application discloses a turbine shaft sleeve sealing structure, including a shaft sleeve 1 and a rotating shaft 2 rotatably connected to the shaft sleeve 1. A clamp 3 is installed on the outer arc surface of the rotating shaft 2. The shaft sleeve 1 has an I-shaped groove 5 on its outer surface end face. A sealing part 4 is installed inside the I-shaped groove 5. The sealing part 4 is used to fill the rotation gap between the rotating shaft 2 and the shaft sleeve 1.

[0029] By using bushing 1 and clamp 3 to limit and compress the sealing part 4 from both sides, the sealing part 4 in this structure is fixed.

[0030] Reference Figure 3 and Figure 4 The sealing part 4 includes a connecting ring 401 rotatably connected to the outer surface end face of the bushing 1. The inner diameter of the connecting ring 401 is larger than the outer diameter of the rotating shaft 2. An integrally formed mounting protrusion 402 is provided on the side of the connecting ring 401 near the bushing 1. The mounting protrusion 402 is divided into two parts, with the wall thickness of the part near the connecting ring 401 being smaller than the wall thickness of the part away from the connecting ring 401. The mounting protrusion 402 is a flexible structure and is installed and filled inside the I-shaped groove 5. A conical sealing element 403 is integrally formed on the inner arc surface of the connecting ring 401. The seal 403 is a conical ring, and the inner arc surface of the conical seal 403 contacts and presses against the outer arc surface of the rotating shaft 2. The conical seal 403 is inclined towards the center of the rotating shaft 2, and a waterproof layer is provided on the surface of the conical seal 403. The contact height between the connecting ring 401 and the conical seal 403 is the same. The top of the connecting ring 401 is provided with several friction protrusions 404 that are evenly spaced and distributed in a circular pattern. The top of the friction protrusions 404 contacts the bottom of the clamp 3. There is a gap at the rotatable connection between the rotating shaft 2 and the bushing 1, and the conical seal 403 covers the top of the gap.

[0031] By installing the protrusion 402 structure in the sealing part 4, the flexible installation protrusion 402 can be squeezed and filled into the H-shaped groove 5 during assembly. At this time, the lower end of the installation protrusion 402 will unfold inside the H-shaped groove 5 to achieve the installation and fixing effect.

[0032] When water flows out from the gap between the rotating shaft 2 and the bushing 1, it enters the triangular area formed by the conical seal 403 and the connecting ring 401. At this time, due to the water pressure, the conical seal 403 is squeezed, resulting in two forces acting on the conical seal 403: upward and tangential to the rotating shaft 2. The upward force is offset by the combination of the mounting protrusion 402 and the I-shaped groove 5. The other part of the tangential force in the direction of the rotating shaft 2 causes the conical seal 403 to be squeezed against the outer arc surface of the rotating shaft 2, thereby making the triangular area more sealed and preventing water from flowing out from the gap between the conical seal 403 and the outer arc surface of the rotating shaft 2.

[0033] The above working process enables the use of hydraulic fluid to achieve an adaptive sealing effect. After a period of use, friction wear will occur between the friction protrusion 404 and the clamp 3, which will cause the height of the friction protrusion 404 to decrease. When the height of the friction protrusion 404 is lower than the warning height, it can remind the staff to replace this structure in time.

Claims

1. A shaft sleeve sealing structure for a water turbine, comprising a shaft sleeve (1) and a rotating shaft (2) rotatably connected to the shaft sleeve (1), wherein a clamp (3) is installed on the outer arc surface of the rotating shaft (2), characterized in that, The bushing (1) has an I-shaped groove (5) on its outer end face. A sealing part (4) is installed inside the I-shaped groove (5). The sealing part (4) is used to fill the rotation gap between the rotating shaft (2) and the bushing (1).

2. The turbine shaft sleeve sealing structure according to claim 1, characterized in that, The sealing part (4) includes a connecting ring (401) that is rotatably connected to the outer surface end face of the bushing (1), and the inner diameter of the connecting ring (401) is larger than the outer diameter of the rotating shaft (2).

3. The turbine shaft sleeve sealing structure according to claim 2, characterized in that, The connecting ring (401) is integrally formed and fixed with a mounting protrusion (402) on the side near the bushing (1). The mounting protrusion (402) is divided into two parts, with the wall thickness of the part near the connecting ring (401) being smaller than that of the part away from the connecting ring (401).

4. The turbine shaft sleeve sealing structure according to claim 3, characterized in that, The mounting protrusion (402) is a flexible structure, and the mounting protrusion (402) is installed and filled inside the I-shaped groove (5).

5. The turbine shaft sleeve sealing structure according to claim 4, characterized in that, The inner arc surface of the connecting ring (401) is integrally formed with a conical seal (403), which is a conical ring. The inner arc surface of the conical seal (403) contacts and presses against the outer arc surface of the rotating shaft (2).

6. The turbine shaft sleeve sealing structure according to claim 5, characterized in that, The conical seal (403) is inclined toward the center of the rotating shaft (2), and the surface of the conical seal (403) is provided with a waterproof layer. The connecting ring (401) and the conical seal (403) have the same contact height.

7. The turbine shaft sleeve sealing structure according to claim 6, characterized in that, The top of the connecting ring (401) is provided with a number of equally spaced friction protrusions (404) distributed in a circular pattern, and the top of the friction protrusions (404) contacts the bottom of the clamp (3).

8. The turbine shaft sleeve sealing structure according to claim 7, characterized in that, A gap is provided at the rotatable connection between the rotating shaft (2) and the bushing (1), and the conical seal (403) is wrapped and covered on the top of the gap.

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