Novel hydroelectric special main shaft seal with extension spring

Abstract

The utility model discloses a novel hydroelectric special main shaft seal with an extension spring. The novel hydroelectric special main shaft seal comprises a sealing ring, the rear side surface of the sealing ring is tightly attached to the lower end of the front side surface of the pressing plate, a supporting ring is arranged at the front end of the sealing ring, the interior of the sealing ring and the outer surface of the main shaft are installed in a matched mode, the sealing ring is a polytetrafluoroethylene ring, a cavity is formed in the front end of the sealing ring, and a groove is formed in the end, away from the center of the sealing ring, of the cavity. The novel hydroelectric special main shaft seal with the extension spring has the advantages that the novel hydroelectric special main shaft seal is good in abrasion resistance and high-temperature resistance, low in friction coefficient, high in sealing performance, high in sealing performance and long in service life, and the service life of the main shaft seal is prolonged. The tight connection of the sealing ring and the supporting ring and the extension spring are realized through the bayonet and the groove, so that the stability and the tightness of the novel hydroelectric special main shaft seal with the extension spring after installation are greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of main shaft working auxiliary equipment for hydropower generation, in particular to a novel main shaft seal with a tension spring for hydropower generation. Background Art

[0002] The special main shaft seal for hydropower is one of the key technologies to ensure the normal operation of hydropower units (such as turbines, water pumps, etc.). Its main function is to prevent water from leaking from the gap between the main shaft and fixed parts, protect the lubricating oil and mechanical parts inside the unit, thereby extending the service life of the unit and ensuring its safe and stable operation. The traditional main shaft working seals of hydropower stations are made of polyurethane, rubber and other materials. Due to the fast rotation speed of the main shaft and large size, the seals often wear and burn out. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the existing defects and provide a new type of hydropower-specific main shaft seal with a tension spring, which has good wear resistance, high temperature resistance and low friction coefficient, and uses a bayonet and a groove to achieve a tight connection between the sealing ring and the supporting ring and the tension spring, which greatly improves the stability and tightness of the new type of hydropower-specific main shaft seal with a tension spring after installation, and can effectively solve the problems in the background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a new type of main shaft seal for hydropower with a tension spring, including a sealing ring;

[0005] Sealing ring: Its rear surface fits tightly with the lower end of the front surface of the pressure plate, and a supporting ring is arranged at the front end of the sealing ring. The inside of the sealing ring is installed in coordination with the outer surface of the main shaft. The sealing ring is a polytetrafluoroethylene ring, which has good wear resistance, high temperature resistance, and low friction coefficient. The sealing ring and the supporting ring are tightly connected and the tension spring is stretched by the bayonet and groove, which greatly improves the stability and tightness of the new hydropower-specific main shaft seal with a tension spring after installation.

[0006] Furthermore, a cavity is provided at the front end of the sealing ring, and a groove is provided at the end of the cavity away from the center of the sealing ring. The front surface of the groove is tightly fitted with the lower end of the rear surface of the supporting ring. A bayonet is provided at the rear end of the supporting ring, and the rear surface of the bayonet is tightly fitted with the front surface of the sealing ring, thereby achieving stable installation of the sealing ring and preventing the sealing ring from rolling or dislocation.

[0007] Furthermore, a tension spring is provided at one end of the cavity close to the center of the sealing ring, which can ensure that the seal is tightly attached to the main shaft surface to prevent leakage when the main shaft vibrates or the sealing surface is worn.

[0008] Furthermore, the stretch spring is a stainless steel stretch spring, which increases the service life of the stretch spring in a water vapor environment.

[0009] Furthermore, a connecting surface is provided inside the sealing ring, and the connecting surface is tightly fitted with the outer surface of the main shaft, so that the sealing ring and the main shaft are tightly installed, thereby ensuring the sealing performance of the sealing ring.

[0010] Compared with the prior art, the utility model has the following beneficial effects: the new hydropower special main shaft seal with tension spring has the following advantages:

[0011] The sealing ring is filled with polytetrafluoroethylene, which has the characteristics of high temperature resistance, low temperature resistance, chemical corrosion resistance and wear resistance, which makes the hydropower special main shaft seal have good wear resistance, and at the same time further increases the wear resistance and reduces the friction coefficient. The supporting ring uses bayonet and groove to achieve a close connection between the supporting ring and the sealing ring, ensuring the stability of the seal after installation and avoiding rolling or misalignment. The stretch spring can ensure that the seal is close to the main shaft surface when the main shaft vibrates or the sealing surface is worn to prevent leakage, which greatly improves the stability and tightness of the new hydropower special main shaft seal with stretch spring after installation, thereby greatly extending the service life of the new hydropower special main shaft seal with stretch spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the utility model;

[0013] Figure 2 It is a schematic diagram of the cross-sectional structure inside the utility model;

[0014] Figure 3 It is a cross-sectional structural schematic diagram of the left side of the utility model;

[0015] Figure 4 It is a cross-sectional structural schematic diagram of the utility model.

[0016] In the figure: 1 sealing ring, 2 cavity, 3 tension spring, 4 connecting surface, 5 groove, 6 pressure plate, 7 supporting ring, 8 main shaft, 9 bayonet. DETAILED DESCRIPTION

[0017] 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.

[0018] See also Figure 1-4 ,This embodiment provides a technical solution: a new type of hydropower-specific main shaft seal with a tension spring, including a sealing ring 1;

[0019] Sealing ring 1: Its rear side surface is tightly fitted with the lower end of the front side surface of the pressure plate 6, and a supporting ring 7 is arranged at the front end of the sealing ring 1. The interior of the sealing ring 1 is matched with the outer surface of the main shaft 8 for installation. The sealing ring 1 is a polytetrafluoroethylene ring. The sealing ring 1 uses polytetrafluoroethylene as filler. Polytetrafluoroethylene has the characteristics of high temperature resistance, low temperature resistance, chemical corrosion resistance and wear resistance, so that the main shaft seal dedicated to hydropower has good wear resistance, and at the same time further increases wear resistance and reduces friction coefficient. A cavity 2 is arranged at the front end of the sealing ring 1, and a groove 5 is arranged at one end of the cavity 2 away from the center of the sealing ring 1. The front side surface of the groove 5 is tightly fitted with the lower end of the rear side surface of the supporting ring 7, and the rear end of the supporting ring 7 is arranged A bayonet 9 is provided, and the rear surface of the bayonet 9 is tightly fitted with the front surface of the sealing ring 1. The supporting ring 7 uses the bayonet 9 and the groove 5 to achieve a tight connection between the supporting ring 7 and the sealing ring 1, thereby ensuring the stability of the seal after installation and avoiding rolling or misalignment. A tension spring 3 is provided at one end of the cavity 2 close to the center of the sealing ring 1. The tension spring 3 is a stainless steel tension spring. A connecting surface 4 is provided inside the sealing ring 1, and the connecting surface 4 is tightly fitted with the outer surface of the main shaft 8. The tension spring 3 can ensure that the seal is tightly attached to the main shaft surface when the main shaft 8 vibrates or the sealing surface is worn to prevent leakage, thereby greatly improving the stability and tightness of the new hydropower-specific main shaft seal with a tension spring after installation.

[0020] The working principle of the new type of main shaft seal with a tension spring for hydropower provided by the utility model is as follows: when working, the connecting surface 4 of the sealing ring 1 is tightly fitted with the outer surface of the main shaft 8, and the thrust applied to the tension spring 3 by the outer surface of the main shaft 8 makes the tension spring 3 elastically stretched, and the elastic force is reacted to the sealing ring 1, so that the connecting surface 4 is tightly fitted with the outer surface of the main shaft 8. When the main shaft 8 vibrates or the sealing surface is worn, it is ensured that the seal is tightly attached to the main shaft surface to prevent leakage. At the same time, the supporting ring 7 is connected with the bayonet 9 and the groove 5 to achieve a tight connection between the supporting ring 7 and the sealing ring 1, ensuring the stability of the seal after installation and avoiding rolling or dislocation. The sealing ring 1 uses polytetrafluoroethylene as filler, so that the special main shaft seal for hydropower has good wear resistance, and at the same time further increases the wear resistance and reduces the friction coefficient, so that the service life of the new type of main shaft seal with a tension spring for hydropower is greatly extended.

[0021] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. New type of main shaft seal with tension spring for hydropower, characterized by: comprising a sealing ring (1); Sealing ring (1): Its rear side surface is tightly fitted with the lower end of the front side surface of the pressure plate (6), a supporting ring (7) is arranged at the front end of the sealing ring (1), the interior of the sealing ring (1) is matched with the outer surface of the main shaft (8), and the sealing ring (1) is a polytetrafluoroethylene ring.

2. The new type of main shaft seal with tension spring for hydropower according to claim 1 is characterized by: The front end of the sealing ring (1) is provided with a cavity (2), and the end of the cavity (2) away from the center of the sealing ring (1) is provided with a groove (5), the front side surface of the groove (5) is tightly fitted with the lower end of the rear side surface of the supporting ring (7), and the rear end of the supporting ring (7) is provided with a bayonet (9), and the rear side surface of the bayonet (9) is tightly fitted with the front side surface of the sealing ring (1).

3. The new type of main shaft seal with tension spring for hydropower according to claim 2 is characterized by: A tension spring (3) is provided at one end of the cavity (2) close to the center of the sealing ring (1).

4. The new type of main shaft seal with tension spring for hydropower according to claim 3 is characterized by: The tension spring (3) is a stainless steel tension spring.

5. The new type of main shaft seal with tension spring for hydropower according to claim 1 is characterized by: A connecting surface (4) is provided inside the sealing ring (1), and the connecting surface (4) is tightly fitted with the outer surface of the main shaft (8).

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