An anti-vibration protection device for a vertical water turbine generator set and its working method

Abstract

A vibration prevention and protection device for a vertical water turbine generator set and its working method disclosed by the present invention belong to the technical field of vibration protection of vertical water turbine generators. It includes a pedestal support pier and a lower frame support pier arranged at the lower end of the foundation pit, and a vibration prevention and protection mechanism arranged between the pedestal and the foundation pit; the vibration prevention and protection mechanism includes a vibration conduction member buried in the foundation pit, a first vibration conduction connecting member connected to the vibration conduction member, a mounting panel detachably installed on the pedestal, and a second vibration conduction connecting member connected to the mounting panel; a vibration protection connection mechanism is connected between the first vibration conduction connecting member and the second vibration conduction connecting member; when the radial vibration amplitude received by the vibration protection connection mechanism is greater than the threshold value, the connection between the first vibration conduction connecting member and the second vibration conduction connecting member is disconnected. The present invention can achieve good and comprehensive vibration prevention effects on vertical water turbine generators.

Description

Technical Field

[0001] The present invention belongs to the technical field of vibration protection of vertical hydro-generators, and particularly relates to an anti-vibration protection device for a vertical hydro-generator unit and its working method. Background Art

[0002] A vertical hydro-generator is a generator that uses a water turbine as a prime mover to convert water energy into electrical energy, and it is widely used in medium and large-sized hydropower stations. A vertical hydro-generator mainly consists of stator and rotor parts, a frame part, an upper frame part, and a lower frame part. During installation, the frame, the upper frame, and the lower frame are placed in a foundation pit.

[0003] A vertical hydro-generator generates vibrations during operation. Such vibrations can cause the internal structure of the vertical hydro-generator to loosen and even lead to operational accidents of the vertical hydro-generator. Therefore, anti-vibration measures need to be implemented for the vertical hydro-generator. For example, in Chinese Patent CN201922162788.7, an anti-vibration safety protection device for a vertical hydro-generator, which uses devices such as a support base and a positioning mechanism arranged at the bottom of the vertical hydro-generator body to achieve anti-vibration safety protection of the vertical hydro-generator. Although this technical solution can provide a certain degree of anti-vibration protection, the vertical hydro-generator has a high rotational speed and large radial vibrations, and the conventional vibration reduction protection measures of the above patent cannot achieve good vibration protection for the vertical hydro-generator. Summary of the Invention

[0004] In order to solve the above existing problems, the purpose of the present invention is to provide an anti-vibration protection device for a vertical hydro-generator unit and its working method, which can achieve good and comprehensive anti-vibration effects on the vertical hydro-generator.

[0005] The present invention is achieved through the following technical solutions:

[0006] An anti-vibration protection device for a vertical hydro-generator unit disclosed by the present invention includes a pedestal support pier and a lower frame support pier arranged at the lower end of the foundation pit, and an anti-vibration protection mechanism arranged between the pedestal and the foundation pit; the anti-vibration protection mechanism includes a vibration conduction member buried in the foundation pit, a first vibration conduction connecting member connected to the vibration conduction member, a mounting panel detachably installed on the pedestal, and a second vibration conduction connecting member connected to the mounting panel; a vibration protection connection mechanism is connected between the first vibration conduction connecting member and the second vibration conduction connecting member; when the radial vibration amplitude received by the vibration protection connection mechanism is greater than a threshold value, the connection between the first vibration conduction connecting member and the second vibration conduction connecting member is disconnected.

[0007] Preferably, the pedestal support pier abuts against the pedestal.

[0008] Preferably, the lower frame support pier and the pedestal support pier are of an integral structure and abut against the lower frame.

[0009] Preferably, an burying pit is provided in the inner wall of the foundation pit, and the vibration conducting member is provided in the burying pit.

[0010] Further preferably, a cover plate is arranged on the inner wall of the foundation pit at a position matching the burying pit, and a hole for the first vibration conducting connecting member to pass through is arranged on the cover plate.

[0011] Preferably, the vibration protection connection mechanism includes a first connection tube provided at an end of the first vibration conduction connection member, a second connection tube provided at an end of the second vibration conduction connection member, and a connection rod connecting the first connection tube and the second connection tube.

[0012] Preferably, a plurality of conducting fixing members buried in the foundation pit and fixedly connected to the vibration conducting member are arranged around the vibration conducting member.

[0013] Preferably, a plurality of anti-vibration protection mechanisms are provided, and are symmetrically arranged along both sides of the main axis.

[0014] The working method of the above-mentioned vertical hydraulic generator set anti-vibration protection device disclosed in the present invention comprises:

[0015] The machine base supporting machine pier and the lower frame supporting machine pier absorb the vibration of the vertical hydraulic turbine generator during operation; the radial vibration of the vertical hydraulic turbine generator during operation is transmitted to the foundation pit through the anti-vibration protection mechanism; when the radial vibration suddenly increases due to an operation failure of the vertical hydraulic turbine generator, the connection between the first vibration conduction connecting member and the second vibration conduction connecting member is disconnected, and the anti-vibration protection mechanism does not transmit vibration.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects:

[0017] The vibration protection device for a vertical hydro-turbine generator disclosed in the present invention absorbs and protects the vibration of the vertical hydro-turbine generator during operation from two aspects. On the one hand, a machine base supporting machine pier and a lower frame supporting machine pier structure are used to absorb part of the vibration of the vertical hydro-turbine generator during operation; on the other hand, a vibration protection mechanism is used to transmit the radial vibration of the vertical hydro-turbine generator during operation to the foundation pit. Compared with traditional vibration protection measures, the vibration absorption and transmission of the present invention are more comprehensive, especially for the radial vibration of the vertical hydro-turbine generator during operation. The first vibration transmission connector and the second vibration transmission connector are connected by a vibration protection connection mechanism in the present invention. When the vibration protection connection mechanism is subjected to radial vibration amplitude greater than a threshold value, the connection between the first vibration transmission connector and the second vibration transmission connector is disconnected. At this time, the vibration protection mechanism does not transmit vibration, which can avoid the vibration protection mechanism being in a vibration transmission state when a large-amplitude radial vibration is caused by an operating failure of the vertical hydro-turbine generator, which in turn causes damage to the vertical hydro-turbine generator itself.

[0018] The working method of the above-mentioned anti-vibration protection device for vertical hydro-generating units disclosed by the present invention has a high degree of automation, can adapt to different operating conditions of vertical hydro-generating units, and provides comprehensive anti-vibration protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the structure of the anti-vibration protection mechanism;

[0021] Figure 3 It is a schematic diagram of the structure of the vibration protection connection mechanism.

[0022] In the figure: 1 - foundation pit, 11 - embedding pit, 12 - cover plate, 2 - pedestal support pier, 3 - lower frame support pier, 4 - pedestal, 5 - anti-vibration protection mechanism, 51 - vibration conduction member, 511 - conduction fixing member, 52 - first vibration conduction connecting member, 53 - installation panel, 54 - second vibration conduction connecting member, 55 - vibration protection connection mechanism, 551 - first connecting cylinder, 552 - second connecting cylinder, 553 - connecting rod, 6 - lower frame, 7 - main shaft, 8 - factory floor, 9 - excitation device, 10 - upper frame. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The following further describes the present invention in detail with reference to the drawings and specific embodiments. The content is an explanation of the present invention rather than a limitation:

[0024] The structure of a vertical hydro-generator mainly includes: pedestal 4, upper frame 10, lower frame 6, main shaft 7, and excitation device 9; among them, the excitation device 9 is located on the factory floor 8, and the pedestal 4, upper frame 10, and lower frame 6 are located in the foundation pit 1 and are perpendicular to the horizontal plane.

[0025] Based on the above structure, as Figures 1 to 3 shown, the present invention provides an anti-vibration protection device based on a vertical hydro-generating unit. The design principle of the anti-vibration protection device is to utilize the foundation pit 1 to achieve the vibration conduction and absorption of the vertical hydro-generator. The structure for realizing vibration conduction and absorption mainly includes three parts. The first is the pedestal support pier 2, the second is the lower frame support pier 3, and the third is the anti-vibration protection mechanism 5; among them, the pedestal support pier 2 abuts against the pedestal 4, and the lower frame support pier 3 is integrally structured with the pedestal support pier 2 and abuts against the lower frame 6. Through the abutting design, on the one hand, it plays a supporting role, and on the other hand, the lower frame support pier 3 and the pedestal support pier 2 can directly absorb part of the vibration of the pedestal 4 and the lower frame 6. Among them, according to factors such as the size and power of the vertical hydro-generator, several anti-vibration protection mechanisms 5 are provided and are symmetrically arranged on the left and right with the main shaft 7 as the symmetry center to ensure that the forces of anti-vibration protection in the radial direction are matched.

[0026] In this embodiment, the vibration protection mechanism 5 includes a vibration transmission member 51 buried in the foundation pit, a first vibration transmission connection member 52 connected to the vibration transmission member 51, a mounting panel 53 detachably mounted on the machine base 4, a second vibration transmission connection member 54 connected to the mounting panel 53, and the first vibration transmission connection member 52 and the second vibration transmission connection member 54 are connected by a vibration protection connection mechanism 55. The mounting panel 53 and the machine base 4 are connected by bolts, which is convenient for disassembly during device maintenance; the first vibration transmission connection member 52, the second vibration transmission connection member 54 and the vibration protection connection mechanism 55 are preferably rigid structures, which are conducive to the conduction of vibration. The realization principle of its vibration absorption is as follows: the machine base 4 generates radial vibration, which is transmitted to the vibration protection connection mechanism 55 through the mounting panel 53 and the second vibration transmission connection member 54, and then transmitted to the first vibration transmission connection member 52 through the vibration protection connection mechanism 55, and then transmitted to the vibration transmission member 51 by the first vibration transmission connection member 52, and finally transmitted to the foundation pit 1 by the vibration transmission member 51, thereby realizing the conduction and absorption of vibration. In order to better realize the vibration conduction between the vibration conductor 51 and the foundation pit 1, the present embodiment further provides a plurality of conduction fixing members 511 buried in the foundation pit 1 and fixedly connected to the vibration conductor 51 along the four sides of the vibration conductor 51. The conduction fixing members 511 are rigid structures, which are generally welded to the conduction fixing members 511, and their shapes are not particularly limited.

[0027] The buried structure of the vibration conductor 51 is as follows: an burying pit 11 is provided in the inner wall of the foundation pit 1, and the vibration conductor 51 is arranged in the burying pit 11. Most of the vibration conductor is buried in the foundation pit 1. On this basis, a cover plate 12 is provided at a position matching the burying pit 11 on the inner wall of the foundation pit 1. A hole for the first vibration conductor connecting member 52 to pass through is provided on the cover plate 12. One end of the hole is located in the middle position of the cover plate 12, and the other end passes through the edge of the cover plate 12 to ensure that the first vibration conductor connecting member 52 can pass through the hole, so that the cover plate 12 can be smoothly covered. After the device is installed, the cover plate 12 can be covered. When the anti-vibration protection mechanism 5 needs to be inspected, the cover plate 12 can be opened to inspect the vibration conductor 51 therein.

[0028] If the radial amplitude of a vertical hydrogenerator suddenly increases significantly due to an operating fault, and if the anti-vibration protection mechanism 5 is still in a state of conducting vibration at this time, it is likely to cause damage to the vertical hydrogenerator itself by the anti-vibration protection mechanism 5. To avoid this problem, in this embodiment, the first vibration conduction connector 52 and the second vibration conduction connector 54 are connected by a vibration protection connection mechanism 55. Through the design of the vibration protection connection mechanism 55, when the radial amplitude of the vertical hydrogenerator suddenly increases significantly, when the radial vibration amplitude received by the vibration protection connection mechanism 55 is greater than the threshold value, it disconnects the connection between the first vibration conduction connector 52 and the second vibration conduction connector 54, and the anti-vibration protection mechanism 5 is in a state of not conducting vibration. The above-mentioned threshold value is a design value, and those skilled in the art can determine it according to the structural design of the vibration protection connection mechanism 55 and the abnormal vibration situation of the vertical hydrogenerator.

[0029] In this embodiment, the vibration protection connection mechanism 55 includes a first connection cylinder 551 provided at the end of the first vibration conduction connector 52, a second connection cylinder 552 provided at the end of the second vibration conduction connector 54, and a connecting rod 553 connecting the first connection cylinder 551 and the second connection cylinder 552; wherein, the first connection cylinder 551 and the first vibration conduction connector 52 adopt an integral structure, the second connection cylinder 552 and the second vibration conduction connector 54 adopt an integral structure, and the connection mode of the connecting rod 553 with the first connection cylinder 551 and the second connection cylinder 552 adopts a bolt connection structure; during installation, the first connection cylinder 551, the second connection cylinder 552 and the connecting rod 553 adopt an inclined installation structure, that is, the three are coaxially arranged but inclined relative to the horizontal plane (the matching first vibration conduction connector 52 and the second vibration conduction connector 54 are coaxially arranged and inclined relative to the horizontal plane), and the inclination angle should not be too large, generally 2-10°. According to the abnormal vibration situation, power and other conditions of the vertical hydrogenerator, those skilled in the art can select an appropriate inclination angle to ensure that the first connection cylinder 551, the second connection cylinder 552 and the connecting rod 553 can be disconnected smoothly during abnormal vibration. During equipment maintenance, only the damaged parts of the first vibration conduction connector 52 and the first connection cylinder 551, the second vibration conduction connector 54 and the second connection cylinder 552 and the connecting rod 553 need to be replaced.

[0030] The above is only the embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention, or equivalent structural or equivalent process transformations made by using the content of the specification and drawings of the present invention, or the direct or indirect application in other related technical fields, should all be covered within the protection scope of the present invention.

Claims

1. A vibration prevention and protection device for a vertical water turbine generator set, characterized in that It includes a pedestal support pier (2) and a lower frame support pier (3) provided at the lower end of the foundation pit (1), and a vibration protection mechanism (5) provided between the pedestal (4) and the foundation pit (1). There are multiple vibration protection mechanisms (5), which are symmetrically arranged on both sides of the main shaft (7); the vibration protection mechanism includes a vibration conduction member (51) buried in the foundation pit (1), a first vibration conduction connecting member (52) connected to the vibration conduction member (51), a mounting panel (53) detachably mounted on the pedestal (4), and a second vibration conduction connecting member (54) connected to the mounting panel (53); a vibration protection connection mechanism (55) is connected between the first vibration conduction connecting member (52) and the second vibration conduction connecting member (54). The vibration protection connection mechanism (55) includes a first connection cylinder (551) provided at the end of the first vibration conduction connecting member (52), a second connection cylinder (552) provided at the end of the second vibration conduction connecting member (54), and a connecting rod (553) connecting the first connection cylinder (551) and the second connection cylinder (552). The first connection cylinder (551), the second connection cylinder (552), and the connecting rod (553) adopt an inclined installation structure. The three are coaxially arranged but inclined relative to the horizontal plane, and the inclination angle is 2-10°; when the radial vibration amplitude of the vibration protection connection mechanism (55) is greater than the threshold value, the connection between the first vibration conduction connecting member (52) and the second vibration conduction connecting member (54) is disconnected.

2. The anti-vibration protection device for the vertical water turbine generator set according to claim 1, characterized in that, The pedestal support pier (2) abuts against the pedestal (4).

3. The anti-vibration protection device for the vertical water turbine generator set according to claim 1, characterized in that, The lower frame support pier (3) is integrally structured with the pedestal support pier (2) and abuts against the lower frame (6).

4. The anti-vibration protection device for the vertical water turbine generator set according to claim 1, characterized in that, A buried pit (11) is provided in the inner wall of the foundation pit (1), and the vibration conduction member (51) is arranged in the buried pit (11).

5. The anti-vibration protection device for vertical water turbine generator sets according to claim 4, characterized in that, A cover plate (12) is provided at a position on the inner wall of the foundation pit (1) matching the buried pit (11), and a hole for the first vibration conduction connecting member (52) to pass through is provided on the cover plate (12).

6. The anti-vibration protection device for a vertical water turbine generator set according to claim 1, characterized in that, A number of conduction fixing members (511) buried in the foundation pit (1) and fixedly connected to the vibration conduction member (51) are further provided around the vibration conduction member (51).

7. The working method of the anti-vibration protection device for the vertical water turbine generator set according to claims 1 to 6, characterized in that, The pedestal support pier (2) and the lower frame support pier (3) absorb the vibration during the operation of the vertical water turbine generator; the radial vibration during the operation of the vertical water turbine generator is conducted to the foundation pit (1) through the vibration protection mechanism (5); when the radial vibration suddenly increases due to the operation failure of the vertical water turbine generator, the connection between the first vibration conduction connecting member (52) and the second vibration conduction connecting member (54) is disconnected, and the vibration protection mechanism (5) does not conduct vibration.

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