Efficient sealing structure of steam turbine shaft seal

Abstract

The efficient sealing structure of the steam turbine shaft seal comprises a shell, bearings are arranged on the two sides in the shell, a rotating shaft is movably arranged in the shell through the bearings, and a sealing mechanism used for sealing the periphery of a shaft body is arranged in the middle of the inner side of the shell. The sealing mechanism comprises fixing rings, mounting rings, an annular connecting piece, a sealing ring and a pressing ring, the fixing rings are fixedly arranged on the two sides of the interior of the shell, the mounting rings are fixedly arranged on the surfaces of the fixing rings, the outer sides of the mounting rings are movably sleeved with the annular connecting piece, and the sealing ring is fixedly arranged at the lower end of the annular connecting piece. According to the utility model, the two symmetrical sealing ring structures are arranged, so that a closed environment can be formed among the sealing rings, the shaft body and the shell, and then cooling oil can be filled in the closed environment, so that a very good heat absorption and heat dissipation effect can be achieved, the service life of the sealing rings can be remarkably prolonged, and the replacement frequency is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing structures, in particular to a high-efficiency sealing structure for a steam turbine shaft seal. Background Art

[0002] Turbine shaft seal, shaft seal is an important component of the steam turbine, it is mainly used to prevent outside air from leaking into the cylinder.

[0003] Among them, the common sealing methods include labyrinth and comb seals, which have simple processing technology and low cost. There are also turbine seals and sealing strips, which have good sealing performance, can effectively reduce leakage and improve rotor stability.

[0004] However, the above-mentioned commonly used structures have limited sealing performance for labyrinth and comb seals and cannot cope with high-pressure situations. For turbine seals using annular sealing strips, the seals and shafts rub for a long time without cooling. The long-term friction and high temperature can easily shorten the life of the seals and make them easy to be damaged, requiring frequent replacement. Therefore, to address this problem, an efficient sealing structure for turbine shaft seals needs to be improved. Utility Model Content

[0005] The purpose of the utility model is to provide a high-efficiency sealing structure for a steam turbine shaft seal to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a high-efficiency sealing structure for a turbine shaft seal, comprising a shell, bearings being arranged on both sides of the interior of the shell, a rotating shaft being movably arranged inside the shell through the bearings, a sealing mechanism for sealing the four sides of the shaft being arranged in the middle of the inner side of the shell, the sealing mechanism comprising a fixing ring, a mounting ring, an annular connector, a sealing ring, and a pressure ring, fixing rings being fixedly arranged on both sides of the interior of the shell, a mounting ring being fixedly arranged on the surface of the fixing ring, an annular connector being movably sleeved on the outer side of the mounting ring, a sealing ring being fixedly arranged on the lower end of the annular connector, and a pressure ring being arranged on one side of the mounting ring.

[0007] Preferably, an annular elastic tightening band is provided on the outer surface of the sealing ring, and the annular elastic tightening band can drive the sealing ring so that the sealing ring fits tightly against the outer surface of the rotating shaft.

[0008] Preferably, a locking screw is provided between the clamping ring and the fixing ring, and the clamping ring and the fixing ring can be tightly fixed together by the locking screw, so that the annular connector and the sealing ring can be fixed by the clamping ring.

[0009] Preferably, a connecting pipe is fixedly provided at the lower end of the shell, through which cooling oil can be injected into the closed environment formed between the sealing ring, the shaft body and the shell. The cooling oil can then be used to achieve a good heat absorption and heat dissipation effect, thereby significantly improving the service life of the sealing ring and reducing the replacement frequency.

[0010] Preferably, a control valve is fixedly provided in the middle of the connecting pipe, and the conduction of the connecting pipe can be controlled by the control valve to facilitate the injection or discharge of oil into the shell.

[0011] Preferably, the sealing ring is attached to the outer surface of the rotating shaft. The sealing at the rotating shaft of the device is performed by the sealing ring, and the sealing ring produces a sealing effect by being tightly attached to the outer surface of the rotating shaft.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] 1. When the utility model is used, cooling oil can be injected into the closed environment formed between the sealing ring, the shaft body and the housing through the connecting pipe. Then, the cooling oil can achieve a good heat absorption and heat dissipation effect, thereby significantly improving the service life of the sealing ring and further reducing the replacement frequency.

[0014] 2. The sealing ring of the utility model is in close contact with the outer surface of the shaft to produce a sealing effect. As the shaft rotates, friction is generated between the shaft and the sealing ring. After the sealing ring is slightly worn, it continues to be closely attached to the outer surface of the shaft under the action of its own elasticity and the annular elastic tightening band, thereby delaying the service life of the sealing ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure of a high-efficiency sealing structure of a steam turbine shaft seal according to the present invention;

[0016] Figure 2 This is a cross-sectional view of a high-efficiency sealing structure of a steam turbine shaft seal according to the present invention;

[0017] Figure 3 This utility model is a high-efficiency sealing structure for a steam turbine shaft seal. Figure 2 Front view of

[0018] Figure 4 This is a disassembled view of a compression ring in a high-efficiency sealing structure of a steam turbine shaft seal according to the present invention;

[0019] Figure 5 This utility model is a high-efficiency sealing structure for a steam turbine shaft seal Figure 3 Magnified view at point B in the middle;

[0020] Figure 6This utility model is a high-efficiency sealing structure for a steam turbine shaft seal Figure 2 Magnified view at point A in the middle.

[0021] In the figure: 1. Housing; 2. Bearing; 3. Rotating shaft; 4. Fixing ring; 5. Mounting ring; 6. Annular connector; 7. Sealing ring; 8. Compression ring; 9. Annular elastic tightening band; 10. Locking screw; 11. Connecting pipe; 12. Control valve. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] See also Figure 1-6 The utility model provides a technical solution: a high-efficiency sealing structure for a steam turbine shaft seal, comprising a shell 1, bearings 2 are arranged on both sides of the interior of the shell 1, a rotating shaft 3 is movably arranged inside the shell 1 through the bearing 2, a sealing mechanism for sealing the four sides of the shaft body is arranged in the middle part of the inner side of the shell 1, the sealing mechanism comprises a fixing ring 4, a mounting ring 5, an annular connector 6, a sealing ring 7, and a clamping ring 8, fixing rings 4 are fixedly arranged on both sides of the interior of the shell 1, a mounting ring 5 is fixedly arranged on the surface of the fixing ring 4, an annular connector 6 is movably sleeved on the outer side of the mounting ring 5, a sealing ring 7 is fixedly arranged on the lower end of the annular connector 6, and a clamping ring 8 is provided on one side of the mounting ring 5.

[0024] The outer surface of the sealing ring 7 is provided with an annular elastic tightening band 9, which can drive the sealing ring 7 so that the sealing ring 7 is tightly fitted to the outer surface of the rotating shaft 3;

[0025] A locking screw 10 is provided between the clamping ring 8 and the fixing ring 4, and the clamping ring 8 and the fixing ring 4 can be tightly fixed together by the locking screw 10, so that the annular connector 6 and the sealing ring 7 can be fixed by the clamping ring 8;

[0026] A connecting pipe 11 is fixedly provided at the lower end of the housing 1, through which cooling oil can be injected into the closed environment formed between the sealing ring 7, the shaft body and the housing 1. This cooling oil can then have a good heat absorption and heat dissipation effect, thereby significantly increasing the service life of the sealing ring 7 and reducing the replacement frequency;

[0027] A control valve 12 is fixedly provided in the middle of the connecting pipe 11, and the conduction of the connecting pipe 11 can be controlled by the control valve 12 to facilitate the injection or discharge of oil into the housing 1;

[0028] The sealing ring 7 is attached to the outer surface of the rotating shaft 3. The sealing of the rotating shaft 3 of the device is performed by the sealing ring 7. The sealing ring 7 is tightly attached to the outer surface of the rotating shaft 3 to produce a sealing effect.

[0029] Working principle: The sealing ring 7 of this device is set on the outer surface of the mounting ring 5 through the annular connecting ring, and then the clamping ring 8 and the fixing ring 4 are tightened by screws to fix them. At this time, under the action of the clamping ring 8, the ring 8-shaped connecting piece 6 can be compressed, so that the annular connecting piece 6 is firmly fixed, so that the sealing ring 7 can be fixed;

[0030] The sealing ring 7 then clings to the outer surface of the shaft 3 to produce a sealing effect. As the shaft 3 rotates, friction is generated between the shaft 3 and the sealing ring 7. After the sealing ring 7 is slightly worn, it continues to cling to the outer surface of the shaft 3 under the action of its own elasticity and the annular elastic tightening band 9, thereby extending the service life of the sealing ring 7.

[0031] When the device is in use, cooling oil can be injected into the closed environment formed between the sealing ring 7, the shaft body and the housing 1 through the connecting pipe 11. This cooling oil can then be used to achieve a good heat absorption and heat dissipation effect, thereby significantly improving the service life of the sealing ring 7 and further reducing the replacement frequency.

[0032] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0033] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency sealing structure for a steam turbine shaft seal, comprising a housing (1), characterized in that: Bearings (2) are provided on both sides of the interior of the housing (1), a rotating shaft (3) is movably provided inside the housing (1) via the bearings (2), a sealing mechanism for sealing the four sides of the shaft body is provided in the middle of the inner side of the housing (1), the sealing mechanism comprises a fixing ring (4), a mounting ring (5), an annular connector (6), a sealing ring (7), and a pressing ring (8), fixing rings (4) are fixedly provided on both sides of the interior of the housing (1), a mounting ring (5) is fixedly provided on the surface of the fixing ring (4), an annular connector (6) is movably sleeved on the outer side of the mounting ring (5), a sealing ring (7) is fixedly provided at the lower end of the annular connector (6), and a pressing ring (8) is provided on one side of the mounting ring (5).

2. The high-efficiency sealing structure for a steam turbine shaft seal according to claim 1, characterized in that: An annular elastic tightening band (9) is provided on the outer surface of the sealing ring (7).

3. The high-efficiency sealing structure for a steam turbine shaft seal according to claim 1, characterized in that: A locking screw (10) is provided between the clamping ring (8) and the fixing ring (4).

4. The high-efficiency sealing structure for a steam turbine shaft seal according to claim 1, characterized in that: A connecting pipe (11) is fixedly provided at the lower end of the shell (1).

5. The high-efficiency sealing structure for a steam turbine shaft seal according to claim 4, characterized in that: A control valve (12) is fixedly provided in the middle of the connecting pipe (11).

6. The high-efficiency sealing structure for a steam turbine shaft seal according to claim 1, characterized in that: The sealing ring (7) is attached to the outer surface of the rotating shaft (3).

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