Visual inspection device for bottom of generator rotor retaining ring

Abstract

The utility model discloses a visual inspection device for the bottom of a generator rotor retaining ring. The visual inspection device comprises a long rod and a front-end video inspection mechanism carried on one end part of the long rod, the front-end video inspection mechanism comprises a packaging cylinder assembly, a zoom camera assembly installed in the packaging cylinder assembly and an object taking channel. And an object taking opening is formed in the end, away from the long rod, of the packaging cylinder assembly and communicates with the object taking channel. According to the utility model, the front-end video inspection mechanism is carried by the long rod and is used for entering the bottom of the generator rotor retaining ring for visual inspection, and the zoom camera assembly is adopted to obtain clear imaging, so that the inspection quality and efficiency are improved; by arranging the object taking channel and the object taking opening, the foreign matter taking function is achieved; the difficulty that the bottom of the rotor retaining ring cannot be inspected and is difficult to inspect is eliminated, and the risk hidden danger caused by the position to generator maintenance is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to generator inspection technical field especially relates to a generator rotor guard ring bottom visual inspection device. BACKGROUND

[0002] During the operation of the generator, the rotor winding provides a stable rotating magnetic field for the generator by direct current, and is an important component of the unit output. Because a large current passes through the rotor, it generates a high temperature during operation and is subjected to a large centrifugal force. To ensure the safety of the rotor winding during operation, the rotor of some generator models uses axial ventilation cooling, and the ventilation port is located at the bottom of the steam and excitation end guard ring. End pads are used at the end of the rotor to fix the winding and prevent the winding from loosening and wearing out, which can cause damage to the winding insulation.

[0003] Due to the structure of the rotor, there is currently a lack of effective means for visual inspection of the rotor steam end guard ring bottom winding during generator maintenance. Foreign matter in the steam end guard ring bottom space is difficult to remove, and it is not possible to timely determine whether the rotor winding ventilation hole is blocked or the end winding is loose and worn.

[0004] The current method for detecting the bottom of the guard ring is to use an endoscope with a threading tube to extend into the rotor guard ring for inspection. The resulting image is blurry and out of focus, and only a limited range of the guard ring bottom can be observed. In the case of finding foreign matter, it is not possible to complete the collection and processing, which takes too long and cannot effectively complete the detection task of the guard ring bottom. In addition, due to the limited space of the steam end of the generator, the existing methods and tools cannot complete the detection of the guard ring bottom, increasing the risk of gaps in the generator maintenance process. UTILITY MODEL CONTENTS

[0005] The technical problem to be solved by the utility model is to provide an improved generator rotor guard ring bottom visual inspection device.

[0006] The technical solution adopted by the utility model to solve its technical problem is: a generator rotor guard ring bottom visual inspection device is provided, which comprises an elongated rod, a front-end video inspection mechanism mounted on one end of the elongated rod;

[0007] The front-end video inspection mechanism comprises a packaging cylinder assembly, a zoom camera assembly installed in the packaging cylinder assembly, and a material taking channel; the end of the packaging cylinder assembly away from the elongated rod is provided with a material taking port, and the material taking port is in communication with the material taking channel.

[0008] Preferably, the packaging cylinder assembly comprises a first cylinder body connected to the elongated rod and a second cylinder body connected to the end of the first cylinder body away from the elongated rod; the end face of the second cylinder body towards the first cylinder body is a bevel opposite to the first cylinder body;

[0009] The zoom camera assembly is mounted in the end of the second cylinder away from the first cylinder.

[0010] Preferably, the second cylinder is provided with a first illumination light source for assisting the zoom camera assembly.

[0011] Preferably, the front-end video inspection mechanism further comprises a wide-angle camera assembly.

[0012] The wide-angle camera assembly is mounted in the end of the second cylinder away from the first cylinder.

[0013] Preferably, the second cylinder is provided with a second illumination light source for assisting the wide-angle camera assembly.

[0014] Preferably, the object taking port is arranged on the first cylinder and / or the second cylinder.

[0015] Preferably, the object taking channel extends along the length of the packaging cylinder assembly, and the outlet of the object taking channel is exposed at the end of the packaging cylinder assembly towards the long rod for connection with a vacuum cleaner, the object taking channel forms a vacuum taking channel, and the object taking port forms a vacuum taking port.

[0016] Preferably, the generator rotor shield ring bottom visual inspection device further comprises a control box connected and used for operating the front-end video inspection mechanism.

[0017] Preferably, the front-end video inspection mechanism further comprises a cable connected between the front-end video inspection mechanism and the control box.

[0018] Preferably, the front-end video inspection mechanism further comprises a display terminal connected with the control box and displaying images and / or videos taken by the front-end video inspection mechanism.

[0019] The generator rotor shield ring bottom visual inspection device has the following advantages: the long rod is provided with the front-end video inspection mechanism for entering the bottom of the generator rotor shield ring for visual inspection, the zoom camera assembly is used to obtain clear imaging, and the inspection quality and efficiency are improved; the object taking channel and the object taking port are arranged to have the function of taking out foreign matters; the difficulty of inspection of the bottom of the rotor shield ring is eliminated, and the risk hidden danger caused by the position to the generator maintenance is solved. BRIEF DESCRIPTION OF DRAWINGS

[0020] The utility model will be described further below in combination with the drawings and examples, and the drawings are as follows:

[0021] Figure 1 is the logic connection diagram of the generator rotor shield ring bottom visual inspection device of one embodiment of the utility model.

[0022] Figure 2 This is a schematic diagram of the structure of the long rod and its upper front video inspection mechanism in the visual inspection device for the bottom of the generator rotor retaining ring according to an embodiment of the present invention;

[0023] Figure 3 and Figure 4 They are Figure 2 Schematic diagrams of the front-end video inspection mechanism from different angles;

[0024] Figure 5 This is a schematic diagram of the imaging principle of the zoom lens in this utility model. Detailed Implementation

[0025] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0026] This utility model relates to a visual inspection device for the bottom of a generator rotor retaining ring, which is used to perform video inspection of the bottom of a turbine generator rotor retaining ring. It can also pick up and remove foreign objects when they are found during the inspection.

[0027] like Figure 1 , Figure 2 As shown, a visual inspection device for the bottom of the generator rotor retaining ring according to an embodiment of the present invention may include a long rod 100, a front-end video inspection mechanism 200 mounted on the long rod 100, and may also include a control box 300 and a display terminal 400.

[0028] The long rod 100 serves as a support for the front-end video inspection mechanism 200. It is used to guide the front-end video inspection mechanism 200 to the bottom of the turbine and excitation end retaining rings of the generator rotor for visual inspection. It also controls the position of the front-end video inspection mechanism 200 at the bottom of the rotor retaining rings, and adjusts its inspection angle and direction. The control box 300 is connected to the front-end video inspection mechanism 200 and is used to send control commands to it, controlling its zoom and magnification. The inspection results from the front-end video inspection mechanism 200 are sent to the control box 300. The display terminal 400 is connected to the control box 300. Operators can control the control box 300 by issuing control commands on the display terminal 400. The inspection results received by the control box 300 from the front-end video inspection mechanism 200 are displayed on the display terminal 400 as images and / or video.

[0029] The long rod 100 is long enough to allow the front-end video inspection mechanism 200 to be inserted into the bottom of the turbine generator rotor retaining ring. For easy storage, the long rod 100 is preferably a telescopic rod.

[0030] CombinationFigures 2-4 The front-end video inspection mechanism 200 is mounted on one end of the long rod 100. Alternatively, the front-end video inspection mechanism 200 can be fixedly installed on the end of the long rod 100, or it can be detachably connected to the end of the long rod 100. For the detachable connection, it can be achieved by an adapter, or by a sleeve and fastener engagement, or a flexible snap-fit ​​connection.

[0031] The front-end video inspection mechanism 200 further includes a sealing cylinder assembly 10, a zoom camera assembly 20 installed within the sealing cylinder assembly 10, and a retrieval channel 30. The camera end of the zoom camera assembly 20 is exposed outside the sealing cylinder assembly 10 to inspect the external environment where the front-end video inspection mechanism 200 is located. The zoom camera assembly 20 employs a zoom lens to acquire clearer images / videos during inspection, improving inspection quality. Preferably, the zoom lens has a zoom range of 2.8mm-12mm and a magnification range of 1x to 4x.

[0032] The zoom camera component 20 is preferably a CMOS zoom camera.

[0033] The retrieval channel 30 is disposed inside the encapsulation cylinder assembly 10 and extends along the length direction (e.g., axial direction) of the encapsulation cylinder assembly 10. The retrieval channel 30 can be implemented by a flexible tube or a rigid tube. A retrieval port 31 is provided on the end of the encapsulation cylinder assembly 10 away from the long rod 100, and the retrieval port 31 communicates with the retrieval channel 30. The end of the retrieval channel 30 away from the retrieval port 31 can be located at the end of the encapsulation cylinder assembly facing the long rod 100, and can serve as the outlet or connection port of the retrieval channel 30.

[0034] The retrieval port 31 and retrieval channel 30 are mainly used to pick up foreign objects when they are found during the inspection of the bottom of the generator rotor retaining ring. The foreign object enters the retrieval channel 30 through the retrieval port. The foreign object can be temporarily stored in the retrieval channel 30 or at the rear end of the encapsulation cylinder assembly 10. After the inspection is completed, it can be taken out along with the front-end video inspection mechanism 200, or the foreign object can be directly taken out of the bottom of the generator rotor retaining ring through the retrieval channel and external equipment.

[0035] In some embodiments, the outlet of the retrieval channel 30 is exposed at the end of the encapsulation cylinder assembly 10 facing the long rod 100, for connection to the vacuum cleaner's suction pipe. The retrieval channel 30 forms a suction channel, and the retrieval port 31 forms a suction port. When a foreign object is detected and retrieved, the vacuum cleaner starts working, creating a negative pressure inside the retrieval channel 30. The foreign object is then sucked into the retrieval channel 30 through the suction port and subsequently drawn out through the vacuum cleaner's suction pipe, thereby bringing it out from the bottom of the generator rotor retaining ring.

[0036] In some embodiments, small clamps may also be used to extend along the retrieval channel 30 out of the retrieval opening 31 to the outside to retrieve foreign objects.

[0037] The front-end video inspection mechanism 200 also includes a reflector 40 configured to cooperate with the zoom camera assembly 20, with the reflector 40 positioned opposite to the zoom lens of the zoom camera assembly 20. The zoom camera assembly 20 uses the reflector 40 to form an image, with the image position covering above the reflector 40.

[0038] The front-end video inspection unit 200 also includes a first illumination source 41 for the auxiliary zoom camera assembly 20, providing sufficient brightness for the zoom camera assembly 20. The first illumination source 41 uses an LED or other type of lighting.

[0039] The encapsulation cylinder assembly 10 serves as the housing of the front-end video inspection mechanism 200 and may further include a first cylinder 11 and a second cylinder 12 connected together. The first cylinder 11 is connected to the long rod 100, and the second cylinder 12 is connected to the end of the first cylinder 11 away from the long rod 100.

[0040] The zoom camera assembly 20 is installed inside the end of the first cylinder 11 facing the second cylinder 12, and the zoom lens of the zoom camera assembly 20 is exposed on the end face of the first cylinder 11.

[0041] To accommodate the reflector 40, the end face of the second cylinder 12 facing the first cylinder 11 is an inclined plane 121 that is spaced apart from the first cylinder 11. The reflector 40 is mounted on this inclined plane 121, and the reflector 40 is tilted relative to the zoom lens along with the inclined plane 121. The first illumination source 41 is correspondingly disposed on the second cylinder 12, close to the reflector 40.

[0042] Reference to the imaging principle of zoom camera component 20 Figure 5 The object distance u, image distance v, and focal length f satisfy the following relationship: Determine the object distance based on the observation range, and adjust the image distance appropriately to obtain a clear image within the zoom range.

[0043] The retrieval port 31 is located on at least one of the first cylinder 11 and the second cylinder 12. Figure 3 In the embodiment shown, the retrieval port 31 is located on the side of the second cylinder 12.

[0044] Furthermore, in some embodiments, the front-end video inspection mechanism 200 also includes a wide-angle camera assembly 50, which is installed at the end of the encapsulation cylinder assembly 10 away from the long rod 100 and at the front end of the front-end video inspection mechanism 200, enabling wide-angle video inspection.

[0045] To provide sufficient brightness for the inspection of the wide-angle camera assembly 50, a second illumination source 51 is installed at the end of the encapsulation cylinder assembly 10. The second illumination source 51 is an LED or other type of lighting lamp.

[0046] The encapsulated cylinder assembly 10 includes a first cylinder 11 and a second cylinder 12 connected to each other. The wide-angle camera assembly 50 is specifically installed inside the end of the second cylinder 12 away from the first cylinder 11, and the camera lens of the wide-angle camera assembly 50 is exposed on the end face of the second cylinder 12. The second illumination source is located on the end face of the second cylinder 12.

[0047] The overall outer peripheral shape of the encapsulation cylinder assembly 10 can be, but is not limited to, circular or polygonal. To avoid wear and tear on equipment, the overall outer peripheral shape of the encapsulation cylinder assembly 10 is preferably circular.

[0048] By combining the zoom camera assembly 20 and the wide-angle camera assembly 50 at different positions within the encapsulation cylinder assembly 10, with the zoom camera assembly 20 positioned in the middle section of the encapsulation cylinder assembly 10, the inspection angle is primarily from the side of the encapsulation cylinder assembly 10. Combined with the placement of the inclined surface 121 and the reflector 40, this satisfies inspection requirements from various angles. The wide-angle camera assembly 50 is located at the front end of the encapsulation cylinder assembly 10, performing inspection of the front environment and, in conjunction with the wide-angle function, meeting the needs of inspection over a wide area.

[0049] The front-end video inspection unit 200 can be connected to the control box 300 via a cable (not shown) to achieve signal transmission, power control, etc.; the cable can be exposed on the outside of the long rod 100 or threaded inside the long rod 100. The display terminal 400 can be connected to the control box 300 via wired and / or wireless means.

[0050] The end of the encapsulation tube assembly 10 facing the long rod 100 may be provided with a socket for connection to the front-end video inspection mechanism 200, for detachable cable connection.

[0051] The front-end video inspection mechanism 200 has a small overall size, meeting the requirements for accessing the bottom of the steam and exciter end guard rings. For example, the overall length of the front-end video inspection mechanism 200 is approximately 260mm, the outer diameter is approximately 60mm, and the weight is approximately 0.8kg.

[0052] This utility model's generator rotor retaining ring bottom visualization inspection device is applied during generator maintenance to inspect the bottom of the steam and excitation rotor retaining rings. It allows access to the bottom of the steam-end retaining ring through the narrow space at the bottom of the generator rotor's steam-end fan mount, enabling visual inspection of the rotor windings. Simultaneously, it can remove foreign objects from the bottom of the steam-end retaining ring or the air guide ring. Compared to existing technologies, it improves the efficiency of inspecting the bottom of the steam and excitation rotor retaining rings. The foreign object removal function ensures timely cleaning upon discovery of foreign objects. It allows for winding inspection without removing the rotor, determining whether there is blockage in the winding ventilation openings, displacement of the winding inter-turn insulation, overheating of the windings, or wear on the rotor end pads. It can efficiently complete inspection tasks within a limited time, reducing the risk of generator operation problems.

[0053] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A visual inspection device for the bottom of a generator rotor retaining ring, characterized in that, Includes a long pole and a front-end video inspection mechanism mounted on one end of the long pole; The front-end video inspection mechanism includes a packaging cylinder assembly, a zoom camera assembly installed inside the packaging cylinder assembly, and a retrieval channel; the packaging cylinder assembly has a retrieval port at one end away from the long rod, and the retrieval port is connected to the retrieval channel.

2. The generator rotor retaining ring bottom visual inspection device according to claim 1, characterized in that, The encapsulation cylinder assembly includes a first cylinder connected to the long rod and a second cylinder connected to the end of the first cylinder away from the long rod; the end face of the second cylinder facing the first cylinder is an inclined surface that is spaced apart from and opposite to the first cylinder. The zoom camera assembly is installed inside the end of the first cylinder facing the second cylinder, and a reflector that cooperates with the zoom camera assembly is provided on the inclined surface of the second cylinder.

3. The generator rotor retaining ring bottom visual inspection device according to claim 2, characterized in that, The second cylinder is provided with a first illumination source to assist the zoom camera assembly.

4. The generator rotor retaining ring bottom visual inspection device according to claim 2, characterized in that, The front-end video inspection mechanism also includes a wide-angle camera component; The wide-angle camera assembly is installed inside the end of the second cylinder away from the first cylinder.

5. The generator rotor retaining ring bottom visual inspection device according to claim 4, characterized in that, The second cylinder is provided with a second illumination source to assist the wide-angle camera assembly.

6. The generator rotor retaining ring bottom visual inspection device according to claim 2, characterized in that, The retrieval port is located on the first cylinder and / or the second cylinder.

7. The generator rotor retaining ring bottom visual inspection device according to claim 1, characterized in that, The retrieval channel extends along the length of the encapsulation cylinder assembly, and the outlet of the retrieval channel is exposed at the end of the encapsulation cylinder assembly facing the long rod for connection with a vacuum cleaner. The retrieval channel forms a vacuuming channel, and the retrieval port forms a vacuuming port.

8. The generator rotor retaining ring bottom visual inspection device according to any one of claims 1-7, characterized in that, The generator rotor retaining ring bottom visualization inspection device also includes a control box, which is connected to and used to operate the front-end video inspection mechanism.

9. The generator rotor retaining ring bottom visual inspection device according to claim 8, characterized in that, The front-end video inspection mechanism also includes a cable connecting the front-end video inspection mechanism and the control box.

10. The generator rotor retaining ring bottom visual inspection device according to claim 9, characterized in that, The front-end video inspection mechanism also includes a display terminal, which is connected to the control box and displays images and / or videos captured by the front-end video inspection mechanism.

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