Large steam turbine vibration isolation device for power plant

Abstract

The invention discloses a large steam turbine vibration isolation device for a power plant, relates to the technical field of steam turbine vibration isolation, and solves the problem that an existing vibration isolation method cannot control vibration of an operation layer platform and a middle layer platform at the same time. The device comprises an operation layer table top, a middle layer table top, a plurality of base columns and a plurality of spring vibration isolators, the base columns are symmetrically arranged on the lower surface of the operation layer table top, and the spring vibration isolators are arranged at the connecting positions of the operation layer table top and the base columns; the middle layer table top is arranged in the middle of the base columns and connected with the base columns, and spring vibration isolators are arranged at the connecting positions. The middle layer table board is parallel to the operation layer table board; and the operation layer table top is connected with the building body platform. The spring vibration isolators are arranged between the middle-layer platform and the base column and between the middle-layer platform and the building platform, vibration transmission of middle-layer vibration in the vertical direction and the horizontal direction is reduced, and the stability of host equipment in the long-term operation process is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of steam turbine vibration isolation, in particular to a large steam turbine vibration isolation device for a power plant. Background Art

[0002] The steam turbine generator set is the heart of the power plant. Its main structure is complex and connected to many high-temperature and high-pressure pipelines. Some auxiliary equipment is also arranged close to the steam turbine generator body. As the base that directly supports the steam turbine generator set, its structural performance has a significant impact on the long-term, safe and stable operation of the unit. The vibration of the upper structure of the base is transmitted to the middle layer through the column. Although there is no vibration source in the middle layer, the thickness of the plate here is relatively small compared to the beams and columns of the operating layer, and its cross-section and parametric mass are very small, resulting in large vibration, which will amplify the vibration of the operating layer. Therefore, in the actual operation of the unit, the vibration of the middle platform is often much larger than that of the operating layer platform, which brings extremely uncomfortable feelings to the operating personnel. In addition, through the investigation of many bases at home and abroad and a large number of dynamic calculation and analysis, the results also show that the vibration of the middle layer is often larger than the vibration at the top plate disturbance point. The middle layer platform is arranged with the generator busbar part. The upper end is connected to the generator output line through CT, and the lower end is supported on the middle platform by insulators. Excessive vibration of the platform will cause the CT or the supporting insulator to break.

[0003] To solve the above problems, the industry uses an intermediate platform with vibration isolation supports for the frame foundation to effectively control the vibration of the intermediate platform: the spring vibration isolation island arrangement is to place a spring vibration isolator between the bottom of the base operating layer platform and the top of the base column, so that the dynamic characteristics of the unit shaft system and the foundation itself are better. Similar to the frame foundation, the steam turbine base (including the base top plate and the structure below the vibration isolator) and the surrounding steam turbine platform structure are still separated by seams. No vibration isolation supports are set on the intermediate platform.

[0004] Although this method can effectively reduce the vibration of the middle platform, it also reduces the stiffness of the operating layer platform, causing the vibration of the unit, platen and platform to increase under the same exciting force, which is not conducive to the long-term safe and stable operation of the host equipment. Summary of the invention

[0005] In order to solve the problem that the existing vibration isolation method mentioned above cannot simultaneously control the vibration of the operating layer and the middle layer platform, the present invention proposes a large steam turbine vibration isolation device for a power plant. The present invention reduces the vibration transmission of the middle layer in the vertical and horizontal directions by arranging spring vibration isolators between the middle layer platform and the base column and the building platform, thereby effectively improving the stability of the main equipment during long-term operation.

[0006] The present invention proposes a large steam turbine vibration isolation device for a power plant, which specifically includes an operating layer table, an intermediate layer table, a plurality of base columns and a plurality of spring vibration isolators. The lower surface of the operating layer table is symmetrically provided with a plurality of base columns, and a spring vibration isolator is provided at the connection position between the operating layer table and the base columns; the intermediate layer table is arranged in the middle of the plurality of base columns and is connected to the plurality of base columns, and a spring vibration isolator is provided at the connection position; the operating layer table is connected to the building platform.

[0007] Furthermore, a spring isolator is provided between the operating floor table and the building platform.

[0008] Furthermore, the middle-layer table top is connected to the building platform via a spring vibration isolator.

[0009] Furthermore, the spring isolator provided at the connection position between the intermediate layer table and the base column is triangular in shape.

[0010] Furthermore, the intermediate layer table top and the running layer table top are parallel.

[0011] The beneficial effects of the large steam turbine vibration isolation device for power plants described in the present invention are:

[0012] (1) The large steam turbine vibration isolation device for a power plant described in the present invention overcomes the problem that the existing vibration isolation method cannot simultaneously control the vibration of the operating layer and the intermediate layer platform. By installing a spring vibration isolator between the operating layer platform and the top of the base column, the vertical transmission of the vibration of the operating layer platform is reduced; a spring vibration isolator is installed between the operating layer platform and the building platform to reduce the horizontal transmission of the vibration of the operating layer platform; a spring vibration isolator is installed between the intermediate layer platform and the base column to reduce the vertical transmission of the vibration of the intermediate layer platform; a spring vibration isolator is installed between the intermediate layer platform and the building platform to reduce the horizontal transmission of the vibration of the intermediate layer platform, thereby ensuring the stability of the operating layer platform and the intermediate layer platform, reducing the vibration value of the operating layer platform and the intermediate layer platform, ensuring that the CT or the supporting insulator is prevented from breaking, and ensuring the stability of the entire unit equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0014] In the attached picture:

[0015] Figure 1 It is a structural schematic diagram of a large steam turbine vibration isolation device for a power plant according to the present invention;

[0016] Among them: 1-operating layer table, 2-middle layer table, 3-base column, 4-spring vibration isolator. DETAILED DESCRIPTION

[0017] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0019] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0020] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0021] Specific implementation method 1: See Figure 1 The present embodiment is described in detail. A large steam turbine vibration isolation device for a power plant described in the present embodiment specifically comprises an operating floor table 1, an intermediate floor table 2, a plurality of base columns 3 and a plurality of spring vibration isolators 4. A plurality of base columns 3 are symmetrically arranged on the left and right sides of the lower surface of the operating floor table 1. A spring vibration isolator 4 is arranged at the connection position between the operating floor table 1 and the base columns 3, thereby reducing the vertical transmission of vibration of the operating floor table 1; the intermediate floor table 2 is arranged in the middle of the plurality of base columns 3 and is connected to the plurality of base columns 3. A spring vibration isolator 4 is arranged at the connection position to reduce the vertical transmission of vibration of the intermediate floor table 2; the operating floor table 1 is connected to the building platform.

[0022] A spring vibration isolator 4 is arranged between the operating floor table 1 and the building platform to reduce the vibration transmission of the operating floor table 1 in the horizontal direction.

[0023] The middle-layer tabletop 2 is connected to the building platform via a spring vibration isolator 4, thereby reducing the vibration transmission of the middle-layer tabletop 2 in the horizontal direction.

[0024] The spring isolator 4 arranged at the connection position between the intermediate layer table top 2 and the base column 3 is triangular in shape, so as to improve the stability of the connection.

[0025] The intermediate layer table top 2 is parallel to the running layer table top 1 .

[0026] To summarize the above implementation cases, the large steam turbine vibration isolation device for a power plant described in the present invention overcomes the problem that the existing vibration isolation method cannot simultaneously control the vibration of the operating layer and the intermediate layer platform, and reduces the vertical transmission of the vibration of the operating layer platform 1 by installing a spring vibration isolator 4 between the operating layer platform 1 and the top of the base column 3; reduces the horizontal transmission of the vibration of the operating layer platform 1 by installing a spring vibration isolator 4 between the operating layer platform 1 and the building platform; reduces the vertical transmission of the vibration of the intermediate layer platform 2 by installing a spring vibration isolator between the intermediate layer platform 2 and the base column 3; reduces the horizontal transmission of the vibration of the intermediate layer platform 2 by installing a spring vibration isolator 4 between the intermediate layer platform 2 and the building platform, thereby ensuring the stability of the operating layer platform 1 and the intermediate layer platform 2, reducing the vibration values ​​of the operating layer platform 1 and the intermediate layer platform 2, ensuring the avoidance of CT or supporting insulator breakage, and ensuring the stability of the entire unit equipment.

[0027] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the invention. It can also be a reasonable combination of the features recorded in the above implementation methods. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A large steam turbine vibration isolation device for a power plant, characterized in that: The utility model comprises an operating layer table (1), an intermediate layer table (2), a plurality of base columns (3) and a plurality of spring vibration isolators (4); the lower surface of the operating layer table (1) is symmetrically provided with a plurality of base columns (3); a spring vibration isolator (4) is provided at the connection position between the operating layer table (1) and the base columns (3); the intermediate layer table (2) is arranged in the middle of the plurality of base columns (3) and is connected to the plurality of base columns (3); a spring vibration isolator (4) is provided at the connection position; the operating layer table (1) and the intermediate layer table (2) are both connected to the building platform.

2. The large steam turbine vibration isolation device for power plants according to claim 1, characterized in that: A spring vibration isolator (4) is arranged between the operating floor table (1) and the building platform.

3. The large steam turbine vibration isolation device for power plants according to claim 1, characterized in that: The middle-layer tabletop (2) is connected to the building platform via a spring vibration isolator (4).

4. The large steam turbine vibration isolation device for power plants according to claim 1, characterized in that: The spring vibration isolator (4) arranged at the connection position between the intermediate layer table top (2) and the base column (3) is in a triangular shape.

5. The large steam turbine vibration isolation device for power plants according to claim 1, characterized in that: The intermediate layer table top (2) and the running layer table top (1) are parallel.

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