Oil seal for front bearing seat of main valve of steam turbine

Abstract

The utility model provides an oil seal for a front bearing seat of a main steam valve of a steam turbine, which belongs to the technical field of steam turbines, overcomes the defects of complicated sealing structure and poor sealing effect of the front bearing seat of the main steam valve of the existing steam turbine, comprises a body, and is characterized in that the body is in a hollow circular ring shape and is formed by connecting an upper half part and a lower half part into a whole; a plurality of layers of ring pieces are arranged on the upper portion and the lower portion of the body respectively, a circular ring is arranged on the upper portion of the body, a mounting disc is connected to the periphery of the circular ring, a connecting hole connected with a bearing seat is formed in the mounting disc, a fan-shaped sinking table is arranged on one side of the body, a communicating hole is formed in the sinking table, and an inner ring groove is formed in a middle hole of the body. Oil holes communicated with the communicating holes are formed between the ring pieces, the sealing effect is improved, the product quality is improved, the product is formed by connecting the upper half part and the lower half part into a whole, machining is convenient, and installation is also very convenient. And the sharp corner of the ring sheet is arranged in the caulking groove arranged on the inner hole of the body, so that the product quality is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of steam turbines, in particular to an oil seal for a front bearing seat of a main steam valve of a steam turbine. Background Art

[0002] At present, during the high-speed rotation of steam turbine rotors, the rotor dynamic balance is maintained by the front and rear bearings in cooperation with the turbine oil system. However, due to the looseness of its own structure and the influence of the operating environment, a certain gap needs to be maintained between the bearings of each section of the turbine and the rotor oil baffle. During normal operation, fine impurities and debris in the environment are easily brought into the bearings by negative pressure and adsorbed in the oil baffle. Carbon deposits and solidification are easy to occur under long-term high temperature conditions, which leads to friction between the rotor and the carbon deposited part of the oil baffle during the operation of the turbine, resulting in a surge in shaft end vibration, which may trigger a trip in severe cases. This has a great impact on the safe, stable and long-term operation of the turbine.

[0003] Among Chinese patent documents, there is a utility model document with publication number CN 220622752 U. This utility model proposes a positive pressure sealing device for a front bearing seat oil seal retainer ring at the end of a steam turbine shaft. A sealing cover box is fitted over the upper side of the front bearing seat oil seal retainer ring at the end of the steam turbine shaft. The turbine shaft passes through the axial hole of the sealing cover box. The sealing cover box is fixed to the turbine housing through mounting holes, forming a closed space between the sealing cover box and the turbine shaft. The device also includes a positive pressure air intake pipe, which is connected to the box cavity of the sealing cover box to form a positive pressure inside the closed space. Air can only escape from the closed space, thereby preventing dust and impurities in the environment from entering the front bearing seat oil seal retainer ring, effectively solving the problems of the prior art.

[0004] However, the above patent documents have complex structures, poor lubrication effects, and poor sealing effects. How to optimize the sealing, improve the overall quality, and improve the installation efficiency is a technical problem that we urgently need to solve. Utility Model Content

[0005] The purpose of the utility model is to provide a turbine main steam valve front bearing seat oil seal to solve the above technical problems existing in the prior art.

[0006] According to the above purpose, the technical solution of the utility model is: a turbine main steam valve front bearing seat oil seal, including a body, characterized in that: the body is in the shape of a hollow circular ring, which is connected into one by two halves, the periphery of the circular ring is connected with a mounting plate, the mounting plate is provided with a connecting hole connected to the bearing seat, one side of the body is provided with a fan-shaped sinking platform, the sinking platform is provided with a connecting hole, the middle hole of the body is provided with an inner ring groove, the upper and lower parts of the inner ring groove are provided with multiple layers of ring sheets, and oil holes communicating with the connecting holes are provided between the ring sheets.

[0007] Furthermore, a right-angled notch is provided on the other side of the main body, and a threaded hole is provided on the notch for connecting the two halves of the main body into one.

[0008] Furthermore, threaded holes for lifting are provided on the upper and lower sides of the main body.

[0009] Furthermore, the ring piece is semicircular as a whole, and has a sharp corner on its outer side, and the sharp corner is installed in the embedding groove provided on the inner hole of the main body.

[0010] Furthermore, the mounting plate is provided with a positioning hole drilled symmetrically with the bearing seat.

[0011] Furthermore, the mounting plate is also provided with a pair of top openings for disassembly.

[0012] Compared with the prior art, the advantages and beneficial effects of this utility model are:

[0013] 1. The utility model has multiple layers of ring sheets above and below the inner ring groove, and oil holes communicating with the connecting holes are provided between the ring sheets, which improves the sealing effect and improves the product quality.

[0014] 2. The utility model is a product that is connected into one piece by two halves, which is not only easy to process but also easy to install;

[0015] 3. The sharp corners of the ring pieces of the utility model are installed in the embedded grooves provided on the inner hole of the body, which improves the installation stability of the ring pieces and improves the product quality;

[0016] 4. The installation plate of the utility model is provided with positioning holes and top opening holes, which further improves the speed and accuracy of installation and also provides convenience for subsequent maintenance, inspection and modification. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of the product of the utility model;

[0018] Figure 2 This is a front view structural diagram of the utility model product;

[0019] Figure 3 This is a schematic diagram of the top view of the structure of the utility model product;

[0020] Figure 4 This is a bottom-up structural diagram of the product of the utility model;

[0021] Figure 5 This is a side structural diagram of the utility model product;

[0022] Figure 6 This is a rear structural diagram of the utility model product;

[0023] Figure 7 for Figure 2 AA cross-sectional structural diagram;

[0024] In the figure: 1. Main body; 2. Mounting plate; 3. Connecting hole; 4. Sink; 5. Connecting hole; 6. Inner ring groove; 7. Ring piece; 8. Oil hole; 9. Notch; 10. Threaded hole; 11. Lifting threaded hole; 12. Embedded groove; 13. Positioning hole; 14. Top opening. DETAILED DESCRIPTION

[0025] Combine Figure 1-Figure 7 , is a schematic diagram of the principle structure of an embodiment of an oil seal for the front bearing seat of a steam turbine main steam valve of the present invention. The oil seal for the front bearing seat of the main steam valve of the steam turbine comprises a body 1. The body 1 is in the shape of a hollow circular ring. For the convenience of internal processing, it is connected into one body by two separate upper and lower halves. The periphery of the circular ring is connected with a mounting plate 2. The mounting plate 2 is provided with a connecting hole 3 connected to the bearing seat, which can be connected to the bearing seat as a whole by bolts. A fan-shaped sinking platform 4 is provided on one side of the body 1. The sinking platform 4 is provided with a communicating hole 5. In order to prevent the lubricating oil from leaking outward, the communicating hole 5 is a non-penetrating sinking hole. An inner ring groove 6 is provided in the middle hole of the body 1. The inner ring groove 6 facilitates the circulation of the lubricating oil. Multiple layers of ring sheets 7 are provided above and below the inner ring groove 6. Oil holes 8 communicating with the communicating hole 5 are provided between the ring sheets 7.

[0026] Preferably, in order to facilitate installation and connection, a right-angled notch 9 is provided on the other side of the main body 1, and a threaded hole 10 is provided on the notch 9 to connect the two halves of the main body 1 into one. The upper and lower halves of the main body 1 can be conveniently connected into one by screws.

[0027] Since the body 1 and the connecting plate 2 are large and heavy, in order to facilitate movement and lifting, lifting threaded holes 11 are provided on the upper and lower sides of the body 1. Lifting can be facilitated by rotating the lifting screws in the threads 11.

[0028] Preferably, in order to facilitate the internal installation of the main body 1, the ring piece 7 is semicircular as a whole, and a sharp corner is provided on the outer side of its cross section. The sharp corner is installed in the embedding groove 12 provided on the inner hole of the main body 1.

[0029] Preferably, in order to improve the accuracy and speed of installation and alignment, the installation plate 2 is further provided with a positioning hole 13 drilled symmetrically with the bearing seat. By arranging a positioning column in the positioning hole 13, the installation and alignment with the bearing seat can be facilitated.

[0030] Preferably, in order to facilitate maintenance, the mounting plate 2 is further provided with a pair of top openings 14 for disassembly. By inserting ejector rods into the top openings 14, disassembly from the bearing seat can be facilitated.

[0031] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

[0032] Although this document frequently uses the following terms: 1. body; 2. mounting plate; 3. connecting hole; 4. sink; 5. communicating hole; 6. inner ring groove; 7. ring plate; 8. oil hole; 9. notch; 10. threaded hole; 11. lifting threaded hole; 12. embedding groove; 13. positioning hole; 14. top opening, the use of other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

[0033] The above is an introduction to the turbine main steam valve front bearing seat oil seal provided by the present invention. In this introduction, specific preferred embodiments are used to illustrate the principles and implementation methods of the present invention. These embodiments are only used to help understand the principles and core ideas of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the design ideas of the present invention, the implementation plans in the above embodiments can be further combined or replaced, and the present invention can be improved and modified in a number of ways. These improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A steam turbine main steam valve front bearing seat oil seal, comprising a body (1), characterized in that: The body (1) is in the shape of a hollow circular ring, and is connected into one body by an upper and lower halves. The periphery of the circular ring is connected to a mounting plate (2), and the mounting plate (2) is provided with a connecting hole (3) connected to the bearing seat. A fan-shaped sinking platform (4) is provided on one side of the body (1), and a connecting hole (5) is provided on the sinking platform (4). An inner ring groove (6) is provided in the middle hole of the body (1), and multiple layers of ring sheets (7) are provided above and below the inner ring groove (6). Oil holes (8) communicating with the connecting hole (5) are provided between the ring sheets (7).

2. The steam turbine main valve front bearing seat oil seal according to claim 1, characterized in that: A right-angled notch (9) is provided on the other side of the body (1), and a threaded hole (10) is provided on the notch (9) for connecting the two halves of the body (1) into one body.

3. The steam turbine main valve front bearing seat oil seal according to claim 1, characterized in that: The upper and lower sides of the body (1) are provided with hanging threaded holes (11).

4. The steam turbine main valve front bearing seat oil seal according to claim 1, characterized in that: The ring piece (7) is semicircular in shape as a whole, and has a sharp corner on its outer side. The sharp corner is installed in a groove (12) provided on the inner hole of the body (1).

5. The steam turbine main valve front bearing seat oil seal according to claim 1, characterized in that: The mounting plate (2) is also provided with a positioning hole (13) drilled symmetrically with the bearing seat.

6. The steam turbine main valve front bearing seat oil seal according to claim 1, characterized in that: The mounting plate (2) is also provided with a pair of top openings (14) for disassembly.

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