Hydraulic turbine main shaft sealing and water blocking device

Abstract

The utility model discloses a kind of water turbine main shaft sealing water retaining device, belong to water turbine sealing device field, including connecting ring and sealing assembly, sealing assembly includes the sealing ring of installation in the end of connecting ring, the inner wall of sealing ring is equipped with sealing ring, the inner wall of sealing ring is slidably connected with magnetic ring, the outer wall of sealing ring is equipped with electromagnet, through the cooperation of each device, the phenomenon of gap of sealing is reduced in the way of overall sealing, improve the service life of water retaining device, reduce the phenomenon that friction leads to poor sealing effect, and then through magnetic ring cooperate electromagnet, in operation, by magnetic repulsion makes magnetic ring adhere water retaining ring, carry out again blocking at connecting sealing place, and then improve sealing effect by the graphite of magnetic ring outer wall and other friction materials, and the setting of multiple pistons is assisted, by main shaft constantly abutting multiple pistons, make it intermittent sliding in the inside of air cavity, and then utilize air pressure to further improve sealing effect.

Description

Technical Field

[0001] This utility model relates to the technical field of water turbine sealing devices, specifically a water turbine main shaft sealing and water-blocking device. Background Technology

[0002] The contact seal device for the main shaft of a water turbine is the core sealing structure used in early water turbines to prevent water leakage from the annular gap between the main shaft and the fixed casing. Its core feature is that the sealing surface is formed by direct physical contact between the sealing element and the outer circular surface of the main shaft. Water leakage is prevented by contact pressure. It was the first mainstream form of sealing for the main shaft of a water turbine.

[0003] Upon investigation, a utility model patent (publication number: CN219570237U) discloses a water-blocking device for sealing the main shaft of a water turbine. This device includes several water-blocking rings connected sequentially to form an annular water-blocking ring. Each water-blocking ring has a mating portion at both ends, allowing adjacent water-blocking rings to be detachably connected via the mating portion. During installation, the annular water-blocking ring is fixed to the portion of the main shaft of the water turbine located between the water guide bearing and the comb-tooth seal. During turbine operation, water jets generated by the comb-tooth seal are blocked by the annular water-blocking ring, effectively preventing water jets from entering the oil pan top cover. Since each water-blocking ring has an extension ring fixed to the side closest to the main shaft of the water turbine, extending along the axial direction of the main shaft, and the inner surface of the extension ring is provided with a first elastic rubber layer, each water-blocking ring can contact the main shaft of the water turbine through the first elastic rubber layer during installation, effectively preventing wear on the water turbine caused by the water-blocking rings.

[0004] Although the aforementioned patent, through the setting of several water-retaining rings, docking parts, and comb-tooth seals, ensures that the first elastic rubber layer contacts the main shaft of the water turbine during operation, thereby preventing the water-retaining rings from causing wear on the water turbine and improving the operating stability of the water turbine, in long-term use, because it forms an annular water-retaining ring with multiple water-retaining rings, it is more prone to vibration and friction during water turbine operation. After long-term use, the sealing effect is more likely to be poor due to friction, reducing the operating stability of the water turbine.

[0005] Therefore, this utility model provides a water-blocking device for sealing the main shaft of a water turbine to solve the above problems. Utility Model Content

[0006] (a) Technical problems to be solved This utility model provides a water-blocking sealing device for the main shaft of a water turbine, which aims to solve the problems mentioned in the background art.

[0007] (II) Technical Solution To achieve the above objectives, this utility model provides the following technical solution: A sealing and water-blocking device for the main shaft of a water turbine includes a connecting ring and a sealing assembly, wherein the sealing assembly includes a sealing ring installed at the end of the connecting ring; A sealing ring is installed on the inner wall of the sealing ring, a magnetic ring is slidably connected to the inner wall of the sealing ring, an electromagnet is installed on the outer wall of the sealing ring, the electromagnet is magnetically connected to the magnetic ring, a rubber gasket is fixedly connected to the top end of the sealing ring, a piston is slidably connected to the top end of the sealing ring, an air chamber is installed at the inner bottom end of the sealing ring on the outer wall of the piston, the piston is slidably connected to the inner wall of the air chamber, and the lower bottom end of the piston is fixedly connected to the inner bottom end of the air chamber by a return spring.

[0008] As a preferred technical solution of this application, the sealing assembly further includes a one-way valve installed on the inner wall of the air chamber, an air inlet groove is provided on the outer surface of the piston, the number of the air inlet grooves is several, and a sealing gasket is installed on the inner wall of the connecting ring, the number of the sealing gaskets is several.

[0009] As a preferred technical solution of this application, a fixing ring is installed at the end of the connecting ring, and a bolt groove is formed on the outer surface of the fixing ring, and the number of bolt grooves is several.

[0010] As a preferred technical solution of this application, the inner wall of the fixing ring is equipped with a micro-expansion sealing sleeve, the number of which is several, and the outer surface of the micro-expansion sealing sleeve is patterned.

[0011] As a preferred technical solution of this application, an mounting ring is installed on the outer wall of the fixing ring, and bolt holes are opened on the outer surface of the mounting ring.

[0012] As a preferred technical solution of this application, the outer walls of the fixing ring, mounting ring and connecting ring are all coated with anti-corrosion coating and anti-rust coating.

[0013] (III) Beneficial Effects By designing a sealing assembly, the interaction of various components and the overall sealing method can reduce the occurrence of gaps in the seal, extend the service life of the water-blocking device, and reduce the phenomenon of poor sealing effect caused by friction. Furthermore, through the cooperation of the magnetic ring and electromagnet, during operation, the magnetic repulsion causes the magnetic ring to adhere to the water-blocking ring, further blocking the connection seal. The graphite and other friction materials on the outer wall of the magnetic ring further enhance the sealing effect. In addition, the setting of multiple pistons assists the sealing ring. When the sealing ring rotates with the main shaft, the main shaft continuously abuts against the multiple pistons, causing them to slide intermittently inside the air chamber. This allows external airflow to rush into the sealing ring, rapidly increasing the air pressure inside the sealing ring, and further improving the sealing effect through air pressure. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram showing the disassembled parts of this utility model; Figure 3 This is a schematic diagram of the internal structure of the air cavity in this utility model; Figure 4 This is a schematic diagram of the micro-expansion sealing sleeve in this utility model.

[0015] In the picture: 1. Connecting ring; 2. Sealing ring; 3. Sealing ring; 4. Magnetic ring; 5. Electromagnet; 6. Rubber gasket; 7. Piston; 8. Air chamber; 9. Return spring; 10. One-way valve; 11. Air inlet groove; 12. Sealing gasket; 13. Fixing ring; 14. Bolt groove; 15. Micro-expansion sealing sleeve; 16. Mounting ring. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] This utility model provides a sealing and water-blocking device for the main shaft of a water turbine, such as... Figures 1-4 As shown, the water-blocking sealing device for the main shaft of a water turbine includes a connecting ring 1 and a sealing assembly. The sealing assembly includes a sealing ring 2 installed at the end of the connecting ring 1. A sealing ring 3 is installed on the inner wall of the sealing ring 2. A magnetic ring 4 is slidably connected to the inner wall of the sealing ring 2. An electromagnet 5 is installed on the outer wall of the sealing ring 2. The electromagnet 5 and the magnetic ring 4 are magnetically connected. A rubber gasket 6 is fixedly connected to the top end of the sealing ring 2. A piston 7 is slidably connected to the top end of the sealing ring 2. An air chamber 8 is installed on the outer wall of the piston 7 at the inner bottom end of the sealing ring 2. The piston 7 is slidably connected to the inner wall of the air chamber 8. The lower bottom end of the piston 7 is fixedly connected to the inner bottom end of the air chamber 8 through a return spring 9.

[0018] The sealing assembly also includes a one-way valve 10 installed on the inner wall of the air chamber 8, an air inlet groove 11 is provided on the outer surface of the piston 7, and there are several air inlet grooves 11. A sealing gasket 12 is installed on the inner wall of the connecting ring 1, and there are several sealing gaskets 12.

[0019] Specifically, the connecting ring 1 facilitates a quick and stable connection with the external main shaft, ensuring the linkage of the sealing and water-blocking device and preventing the turbine from malfunctioning due to loose connections. Through the sealing assembly, the cooperation of various components during turbine operation allows the magnetic ring 4 to continuously abut against the connection between the main shaft and the sealing ring 2 via magnetic repulsion, improving the sealing effect while preventing friction from reducing rotational efficiency. The activation of the electromagnet 5 utilizes magnetic repulsion to make the magnetic ring 4 slide along the inner wall of the sealing ring 2 until it abuts against the inner bottom end of the sealing ring 2. When the connecting ring 1 rotates with the main shaft, the abutment block installed on the outer wall of the main shaft quickly abuts against the pistons 7 sliding on the inner walls of multiple sealing rings 2, causing them to move within the air chamber 8. The components slide rapidly, allowing external airflow to quickly enter the sealing ring 2. High-speed air pressure further tightens the contact between the magnetic ring 4 and the sealing gasket 12 and the main shaft, thereby improving the sealing performance of the sealing and water-blocking device and preventing leakage during turbine operation. The return spring 9 at the bottom of the air chamber 8 allows the piston 7 to quickly return to its original position after contact, facilitating the next contact and air intake. The one-way valve 10 allows external air intake while preventing internal airflow from overflowing. The air intake groove 11 allows external airflow to quickly enter the air chamber 8, improving air intake efficiency. This component has a simple structure, is highly practical, and can improve the sealing effect through the cooperation of its various components.

[0020] A fixing ring 13 is installed at the end of the connecting ring 1. The outer surface of the fixing ring 13 is provided with bolt grooves 14, and there are several bolt grooves 14.

[0021] The inner wall of the fixing ring 13 is equipped with a micro-expansion sealing sleeve 15. There are several micro-expansion sealing sleeves 15, and the outer surface of the micro-expansion sealing sleeve 15 is patterned.

[0022] A mounting ring 16 is installed on the outer wall of the fixing ring 13, and bolt holes are opened on the outer surface of the mounting ring 16.

[0023] Specifically, the fixed ring 13 installed at the end of the connecting ring 1 can maintain the operational stability of the sealing and water-blocking device, while the multiple bolt grooves 14 on its outer surface can improve the tightness of the connection with external equipment. The micro-expansion sealing sleeve 15 on the inner wall of the fixed ring 13 can further improve the sealing effect by expanding and squeezing through its own material properties, and the installation ring 16 can improve the installation stability with external equipment.

[0024] The outer walls of the fixing ring 13, the mounting ring 16 and the connecting ring 1 are all coated with anti-corrosion coating and anti-rust coating.

[0025] Specifically, by applying anti-corrosion and anti-rust coatings to the outer walls of the fixing ring 13, mounting ring 16, and connecting ring 1, their anti-rust and anti-corrosion performance can be improved, avoiding rust during long-term use and thus reducing the quality of sealing and connection.

[0026] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A sealing and water-blocking device for the main shaft of a water turbine, comprising a connecting ring (1) and a sealing assembly, characterized in that: The sealing assembly includes a sealing ring (2) installed at the end of the connecting ring (1); A sealing ring (3) is installed on the inner wall of the sealing ring (2). A magnetic ring (4) is slidably connected to the inner wall of the sealing ring (2). An electromagnet (5) is installed on the outer wall of the sealing ring (2). The electromagnet (5) is magnetically connected to the magnetic ring (4). A rubber pad (6) is fixedly connected to the upper top of the sealing ring (2). A piston (7) is slidably connected to the upper top of the sealing ring (2). An air chamber (8) is installed on the outer wall of the piston (7) at the inner bottom end of the sealing ring (2). The piston (7) is slidably connected to the inner wall of the air chamber (8). The lower bottom end of the piston (7) is fixedly connected to the inner bottom end of the air chamber (8) through a return spring (9).

2. The water-blocking sealing device for the main shaft of a water turbine according to claim 1, characterized in that: The sealing assembly also includes a one-way valve (10) installed on the inner wall of the air chamber (8), an air inlet groove (11) is provided on the outer surface of the piston (7), and there are several air inlet grooves (11). A sealing gasket (12) is installed on the inner wall of the connecting ring (1), and there are several sealing gaskets (12).

3. The turbine main shaft sealing and water-blocking device according to claim 2, characterized in that: The end of the connecting ring (1) is fitted with a fixing ring (13), and the outer surface of the fixing ring (13) is provided with bolt grooves (14), and the number of bolt grooves (14) is several.

4. The water-blocking sealing device for the main shaft of a water turbine according to claim 3, characterized in that: The inner wall of the fixing ring (13) is equipped with a micro-expansion sealing sleeve (15), and there are several micro-expansion sealing sleeves (15). The outer surface of the micro-expansion sealing sleeve (15) is patterned.

5. A water-blocking sealing device for a turbine main shaft according to claim 3, characterized in that: The outer wall of the fixing ring (13) is fitted with an installation ring (16), and the outer surface of the installation ring (16) is provided with bolt holes.

6. The turbine main shaft sealing and water-blocking device according to claim 5, characterized in that: The outer walls of the fixing ring (13), mounting ring (16) and connecting ring (1) are all coated with anti-corrosion coating and anti-rust coating.

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