A flexible adaptive connection structure for the stator end of a large generator

Abstract

The present invention relates to a flexible adaptive connection structure for the stator end of a large generator, and belongs to the technical field of generators. A conical ring bracket is provided at the stator end, and a flexible adaptive connection structure is provided between the conical ring bracket and the stator pressure ring, and the flexible adaptive connection structure includes a flexible connection plate, a hexagon socket bolt, a spacer, and a process adjustment bolt; the pressure ring is connected to one end of the flexible connection plate through the spacer, and the other end of the flexible connection plate is connected to the conical ring bracket; a bolt hole for passing the process adjustment bolt is provided on the spacer, and the spacer is connected to the flexible connection plate through the hexagon socket bolt. By adopting an axial flexible connection plate in the present invention, the end of the stator coil is well fixed in the circumferential direction, and at the same time meets the adaptability of axial free extension and contraction, achieving the structural design requirements of both rigidity and flexibility, keeping the end of the generator away from the frequency doubling, meeting the national standard requirements, and meeting the safety operation requirements.

Description

Technical Field

[0001] The invention relates to a flexible adaptive connection structure for a large generator stator end, belonging to the technical field of generators. Background Art

[0002] In recent years, there has been a strong demand for large-capacity generators in the domestic and international markets, and large generators have a relatively broad market prospect. During the design and development process of large generators, the industry generally pays attention to the vibration and vibration frequency of the generator stator end structure, and the national standard requires it to be far away from the double frequency. The current new designs mostly use a "bracket + small cone ring" structure to replace the original traditional "large cone ring" structure. The new design optimizes the connection and fixing structure with the iron core and reduces the end double frequency. The axial expansion and contraction of the traditional large cone ring is achieved by a sliding structure, which is complex and the overall frequency of the end is close to the double frequency. How to fix the stator coil end circumferentially in the new design "bracket + small cone ring" structure, while meeting the axial free expansion and contraction adaptability conditions, so that the generator end is far away from the double frequency, meeting the national standard requirements, and meeting the requirements of safe operation has become a technical problem that urgently needs to be solved in this technical field. Summary of the Invention

[0003] The purpose of the present invention is to solve the technical problem of how to fix the stator coil end in the "bracket + small cone ring" structure of the generator stator end so that the generator end is away from the double frequency.

[0004] In order to achieve the purpose of solving the above problems, the technical solution adopted by the present invention is to provide a flexible adaptive connection structure for the stator end of a large generator, wherein a conical ring bracket is provided at the stator end, and a flexible adaptive connection structure is provided between the conical ring bracket and the stator pressure ring, and the flexible adaptive connection structure includes a flexible connection plate, a hexagon socket bolt, a gasket and a process adjustment bolt; the pressure ring is connected to one end of the flexible connection plate through the gasket, and the other end of the flexible connection plate is connected to the conical ring bracket; a bolt hole for passing the process adjustment bolt is provided on the gasket, and the gasket is connected to the flexible connection plate through the hexagon socket bolt.

[0005] Preferably, the pressure ring is provided with a countersunk hole for installing a cushion block.

[0006] Preferably, the pad is provided with a process adjustment bolt for adjusting the pad to be parallel to the plane of the flexible connecting plate.

[0007] Preferably, the pad and the pressure ring are fixedly connected.

[0008] Preferably, the pad and the pressure ring are welded.

[0009] Preferably, the pad is provided with a bolt hole for fixing the hexagon socket bolt.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] The gasket in the flexible adaptive connection structure at the end of the generator core provided by the present invention has a large degree of adjustment freedom, which makes the connection between the flexible connection plate at the end of the generator stator and the cone ring bracket more secure, and can improve the vibration frequency of the end structural parts, making it far away from the national standard frequency range of 95-110Hz; each pressure ring gasket can be adjusted individually, which facilitates the installation of the "bracket + small cone ring" and the flexible connection plate, improves the operability of the process, reduces the installation stress of the flexible connection plate, and has strong adaptive performance under various operating conditions.

[0012] The "bracket + small cone ring" at the end of the generator stator is connected to the iron core and fixed using the flexible adaptive connection structure of the present invention. By adopting an axially flexible connecting plate, the end of the stator coil is well fixed circumferentially, while meeting the axial free extension and contraction adaptability working conditions, achieving the structural design requirements of both rigidity and flexibility, keeping the generator end away from the frequency doubling, meeting national standards, and meeting safe operation requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the pressure ring pad of the present invention.

[0014] Figure 2 This is a schematic diagram of the assembly of the flexible connecting plate and the pad block of the present invention.

[0015] Figure numerals: 1. Flexible connecting plate; 2. Hexagon socket bolt; 3. Spacer; 4. Process adjustment bolt; 5. Pressing ring. DETAILED DESCRIPTION

[0016] In order to make the present invention more clearly understood, preferred embodiments are described in detail below with reference to the accompanying drawings:

[0017] like Figure 1-2 As shown, the present invention provides a flexible adaptive connection structure for the stator end of a large generator. A conical ring bracket is provided at the stator end, and a flexible adaptive connection structure is provided between the conical ring bracket and the stator pressure ring 5. The flexible adaptive connection structure includes a flexible connection plate 1, a hexagon socket bolt 2, a spacer 3, and a process adjustment bolt 4. The pressure ring 5 is connected to one end of the flexible connection plate 1 via the spacer 3, and the other end of the flexible connection plate 1 is connected to the conical ring bracket. The spacer 3 is provided with a bolt hole for passing the process adjustment bolt 4, and the spacer 3 is connected to the flexible connection plate 1 via the hexagon socket bolt 2. The pressure ring 5 is provided with a countersunk hole for installing the spacer 3. The spacer 3 is provided with a process adjustment bolt 4 for adjusting the spacer 3 to be parallel to the plane of the flexible connection plate 1. The spacer 3 and the pressure ring 5 are fixedly connected. The spacer 3 and the pressure ring 5 are welded. The spacer 3 is provided with a bolt hole for fixing the hexagon socket bolt 2.

[0018] The purpose of the present invention is to provide a connection structure that can make the end flexible connection adapt to the installation requirements of the generator stator end cone ring and bracket, ensuring that the cone ring bracket structure is safe and reliable and the frequency meets the standard.

[0019] In order to achieve the above purpose, the present invention determines the number of flexible connecting plates 1 by calculation, and realizes the installation adjustment of each flexible connecting plate 1 in the circumferential direction through three-dimensional simulation, ensuring that the angle of the flexible connecting plate 1 at each position matches the angle of the conical ring bracket.

[0020] The structure and assembly are as follows: There are n sets of flexible structural plates at the steam excitation end. The cone ring and bracket assembly at the stator end are connected one-to-one via flexible connecting plates 1 and pressure ring pads 3. The flexible connecting plates 1 and pressure ring pads 3 are bolted together, and the pads 3 and pressure ring 5 are welded. The pressure ring 5 has assembly countersunk holes. Before welding, three process adjustment bolts 4 (purely for process purposes) on the pressure ring pads 3 are used to adjust the pads 3 and the flexible connecting plates 1 to be parallel in plane. The connection is in a natural state, ensuring that the torsional stress of the flexible connecting plates 1 is minimized when subjected to force, thereby improving structural safety.

[0021] The flexible connecting plate 1 at the end of the generator core and the "bracket + small cone ring" connection structure provided by the present invention give the product the following advantages: the adjustment freedom of the gasket 3 is large, the connection between the flexible connecting plate 1 at the end of the generator stator and the cone ring bracket is more secure, and the vibration frequency of the end structural parts can be improved, away from the national standard frequency range of 95-110Hz; each pressure ring gasket 3 can be adjusted individually, which facilitates the installation of the "bracket + small cone ring" and the flexible connecting plate 1, improves the operational processability, reduces the installation stress of the flexible connecting plate 1, and has strong adaptability under various operating conditions.

[0022] Example

[0023] like Figure 1-2 The figure shows a flexible end structure adapted to the installation requirements of the generator stator end cone ring and bracket. The spacer 3 below the flexible connecting plate 1 is welded to the pressure ring 5, which is countersunk. Before welding, the plane of the spacer 3 is adjusted using three adjustment bolts 4 on the spacer 3 to align the planes of each flexible connecting plate 1 assembled with the cone ring and bracket. After alignment, the lower portion of the flexible connecting plate 1 is secured to the spacer 3 with hexagon socket bolts 2. The upper portion of the flexible connecting plate 1 connects to the cone ring bracket via threaded holes in another spacer.

[0024] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form or substance. It should be pointed out that ordinary technicians in this technical field can make several improvements and supplements without departing from the present invention, and these improvements and supplements should also be regarded as the scope of protection of the present invention. Any equivalent changes, modifications and evolutions made by technicians familiar with this profession without departing from the spirit and scope of the present invention by using the technical content disclosed above are all equivalent embodiments of the present invention; at the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A flexible adaptive connection structure for the stator end of a large generator, wherein a cone ring bracket is provided at the stator end, and a flexible adaptive connection structure is provided between the cone ring bracket and the stator pressure ring, characterized in that: The flexible adaptive connection structure includes a flexible connection plate, a hexagon socket bolt, a pad and a process adjustment bolt; the pressure ring is connected to one end of the flexible connection plate through the pad, and the other end of the flexible connection plate is connected to the cone ring bracket; the pad is provided with a bolt hole for passing the process adjustment bolt, and the pad is connected to the flexible connection plate through the hexagon socket bolt; the pad is provided with a process adjustment bolt for adjusting the pad to be parallel to the plane of the flexible connection plate.

2. A flexible adaptive connection structure for the stator end of a large generator according to claim 1, characterized in that: The pressure ring is provided with a countersunk hole for installing a cushion block.

3. The flexible adaptive connection structure for the stator end of a large generator according to claim 1, characterized in that: The cushion block and the pressure ring are fixedly connected.

4. A flexible adaptive connection structure for a large generator stator end according to claim 1, characterized in that: The pad and the pressure ring are welded.

5. The flexible adaptive connection structure for the stator end of a large generator according to claim 1, characterized in that: The pad is provided with a bolt hole for fixing the hexagon socket bolt.

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