A kind of oil-immersed transformer pressure maintaining seal detection device

Abstract

This utility model relates to an oil-immersed transformer pressure-holding and sealing testing device, belonging to the field of transformer manufacturing technology. It includes a testing pool and testing equipment mounted on the upper surface of a base. The testing equipment consists of a first electric slide rail, a gantry frame, a hydraulic telescopic rod, and a load-bearing structure. An observation mechanism is provided outside the testing pool. The observation mechanism includes a moving component, a piston assembly, and a camera. The moving component includes a second electric slide rail fixed to the upper surface of the base and surrounding the testing pool, with a mounting bracket connected to the second electric slide rail. The observation mechanism also includes a wave seat fixed outside the testing pool and used in conjunction with the piston assembly. This oil-immersed transformer pressure-holding and sealing testing device uses a camera to capture real-time images of air bubbles on the transformer surface. Combined with the airflow cleaning function of the piston assembly, it ensures clear images, improves testing accuracy, and automates the entire testing process, reducing manual intervention.

Description

Technical Field

[0001] This utility model relates to the field of transformer manufacturing technology, specifically to an oil-immersed transformer pressure-holding and sealing testing device. Background Technology

[0002] The transformer body of an oil-immersed transformer is housed in a tank filled with transformer oil to protect the transformer and extend its service life. During the production of the tank, a sealing test is required to ensure the tank's sealing and pressure-holding performance.

[0003] A search revealed that patent document CN221764779U discloses an oil-immersed transformer pressure-holding and sealing testing device, including a base frame with a support frame fixedly connected to the top. A testing box for sealing testing the transformer is mounted on the top of the support frame. This oil-immersed transformer pressure-holding and sealing testing device involves moving the transformer to be tested into the base frame, activating a hydraulic rod to move the clamping blocks downwards, simultaneously positioning the clamping blocks on both sides of the transformer. Rotating the torsion cap rotates the second threaded rod, which in turn moves the clamping blocks to clamp and fix the transformer on both sides. Activating the hydraulic rod again moves the transformer upwards, and activating the motor rotates the first threaded rod, which in turn moves the threaded block to the right, moving the transformer to the appropriate position. Activating the hydraulic rod again moves the transformer into the testing box for sealing testing. The sealing performance is determined by observing air bubbles within the testing box.

[0004] The aforementioned patent also has the following drawbacks: such as poor feasibility of bubble observation. This application detects the transformer body by observing bubbles in the detection box. However, this method is not only very crude, but also makes it difficult to observe turbid liquids and has blind spots. Furthermore, it is difficult to locate tiny leak points and cannot quantitatively determine the leakage rate. Therefore, it cannot meet production needs. Hence, an oil-immersed transformer pressure-holding and sealing detection device is proposed to solve the problems mentioned above. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides an oil-immersed transformer pressure-holding and sealing detection device, which has advantages such as multi-angle observation. It solves the problems of bubble observation methods being not only very rough, but also making it difficult to observe turbid liquids, and having blind spots, but also making it difficult to locate tiny leak points and quantitatively determine the leakage rate.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an oil-immersed transformer pressure-holding and sealing testing device, comprising a testing pool and testing equipment installed on the upper surface of a base, wherein the testing equipment consists of a first electric slide rail, a gantry frame, a hydraulic telescopic rod, and a load-bearing structure;

[0007] An observation mechanism is provided outside the detection pool. The observation mechanism consists of a moving component, a piston component, and a camera. The moving component includes a second electric slide rail fixed to the upper surface of the base and arranged around the detection pool. A mounting bracket is connected to the second electric slide rail.

[0008] The observation mechanism also includes a wave seat fixed to the outside of the detection pool and used in conjunction with the piston assembly.

[0009] Furthermore, the detection pool and the first electric slide rail are both fixed to the upper surface of the base. There are two first electric slide rails. The gantry is connected to the two first electric slide rails. The hydraulic telescopic rod is fixed to the gantry.

[0010] Furthermore, the loading structure includes a connecting frame fixed to the output end of the hydraulic telescopic rod. The connecting frame is provided with two trays distributed vertically. The bottom tray is fixed to the outer wall of the connecting frame, and the top tray is slidably connected to the connecting frame. A positioning shaft for fixing the top tray is inserted and installed inside the connecting frame.

[0011] Furthermore, a limiting frame for limiting the position of the mounting frame is fixed on the outer surface of the detection pool, and the camera is fixed to the top side of the mounting frame.

[0012] Furthermore, the piston assembly includes a piston cylinder fixed to the side of the mounting frame near the detection pool. A piston block is disposed inside the piston cylinder. A reciprocating rod extending to the outside of the piston cylinder is fixed on the outer wall of the piston block. A ball bearing that abuts against the wave seat is rotatably mounted on the other end of the reciprocating rod.

[0013] Furthermore, a return spring is installed between the outer surface of the reciprocating rod and the piston cylinder, and a check valve is provided on the piston cylinder.

[0014] Furthermore, the piston assembly also includes a pressurizing component fixed to the outside of the camera. The pressurizing component includes two expansion tubes, and a throat is fixed between the two expansion tubes. A nozzle is installed outside the lens of the camera. A first connecting tube and a second connecting tube are respectively installed at one end of the two expansion tubes. The other end of the first connecting tube is connected to a check valve on the piston cylinder, and the other end of the second connecting tube is fixedly connected to the nozzle.

[0015] Compared with the prior art, this utility model provides an oil-immersed transformer pressure-holding and sealing testing device, which has the following beneficial effects:

[0016] 1. This oil-immersed transformer pressure-holding and sealing detection device uses a camera to capture real-time images of air bubbles on the transformer surface. Combined with the airflow cleaning function of the piston assembly, it ensures clear images and improves detection accuracy. The entire detection process is automated, reducing manual intervention, operational difficulty, and human error.

[0017] 2. This oil-immersed transformer pressure-holding and sealing detection device utilizes the mechanical energy of the sliding rail movement to convert it into clean airflow. No additional air pump or power supply is required. The camera movement and cleaning action are naturally synchronized, avoiding downtime for maintenance. The venturi tube enhances the efficiency, and the low-speed piston airflow is accelerated through the throat to form a high-speed jet flow, thereby improving the cleaning power. Attached Figure Description

[0018] Figure 1 This is a three-dimensional view of the structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the observation mechanism of this utility model;

[0020] Figure 3 This is a cross-sectional view of the piston cylinder of this utility model;

[0021] Figure 4 This is a partial structural schematic diagram of the piston assembly of this utility model.

[0022] In the diagram: 1. Base; 2. Detection pool; 3. First electric slide rail; 4. Gantry frame; 5. Hydraulic telescopic rod; 6. Connecting frame; 7. Support plate; 8. Observation mechanism; 81. Second electric slide rail; 82. Mounting frame; 83. Camera; 84. Limiting frame; 85. Piston assembly; 851. Piston cylinder; 852. Piston block; 853. Reciprocating rod; 854. Ball bearing; 855. Return spring; 856. Expansion tube; 857. Throat tube; 858. Nozzle; 859. First connecting tube; 8510. Second connecting tube; 86. Wave seat. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figures 1 to 4 The oil-immersed transformer pressure-holding and sealing testing device in this embodiment includes a testing pool 2 and testing equipment installed on the upper surface of the base 1. The testing equipment consists of a first electric slide rail 3, a gantry frame 4, a hydraulic telescopic rod 5, and a load-bearing structure. Specifically, the testing pool 2 and the first electric slide rail 3 are both fixed on the upper surface of the base 1. There are two first electric slide rails 3. The gantry frame 4 is connected to the two first electric slide rails 3. The hydraulic telescopic rod 5 is fixed on the gantry frame 4.

[0025] To accommodate the transformer, the support structure includes a connecting frame 6 fixed to the output end of the hydraulic telescopic rod 5. The connecting frame 6 has two vertically distributed support plates 7. The bottom support plate 7 is fixed to the outer wall of the connecting frame 6, while the top support plate 7 is slidably connected to the connecting frame 6. A positioning shaft for fixing the top support plate 7 is inserted into the connecting frame 6. This design simplifies and speeds up transformer installation; simply place the transformer on the bottom support plate 7 and slide the top support plate 7 to the desired position. The sliding connection of the top support plate 7 allows the support structure to accommodate transformers of varying heights. By adjusting the position of the top support plate 7 and fixing it with the positioning shaft, the stability of the transformer during testing is ensured, avoiding testing errors caused by transformer size mismatch.

[0026] To facilitate observation of the pressure-holding seal of the oil-immersed transformer, an observation mechanism 8 is installed on the outside of the testing pool 2. The observation mechanism 8 comprises a moving component, a piston assembly 85, and a camera 83. The moving component includes a second electric slide rail 81 fixed to the upper surface of the base 1 and surrounding the testing pool 2, with a mounting bracket 82 connected to the second electric slide rail 81. The observation mechanism 8 also includes a wave seat 86 fixed to the outside of the testing pool 2 and used in conjunction with the piston assembly 85. A limiting bracket 84 is fixed to the outer surface of the testing pool 2 to limit the movement of the mounting bracket 82, and the camera 83 is fixed to the top side of the mounting bracket 82. The second electric slide rail 81 in the moving component drives the mounting bracket 82 to move around the testing pool 2, allowing the camera 83 to be adjusted to different angles for comprehensive observation of the transformer, ensuring no blind spots in the inspection and improving the comprehensiveness and accuracy of the inspection.

[0027] To improve imaging results, the piston assembly 85 includes a piston cylinder 851 fixed to the side of the mounting bracket 82 near the detection pool 2. A piston block 852 is disposed inside the piston cylinder 851. A reciprocating rod 853 extending to the outside of the piston cylinder 851 is fixed to the outer wall of the piston block 852. A ball bearing 854, which abuts against the wave seat 86, is rotatably mounted at the other end of the reciprocating rod 853. The linkage design between the piston assembly 85 and the wave seat 86 utilizes the mechanical energy of the moving mounting bracket 82 to drive the piston movement, eliminating the need for an additional power source and achieving efficient energy utilization while simplifying the system structure. A return spring 855 is installed between the outer surface of the reciprocating rod 853 and the piston cylinder 851, and a check valve is provided on the piston cylinder 851. Specifically, the piston assembly 85 also includes a pressurizing component fixed to the outside of the camera 83. The pressurizing component includes two expansion tubes 856, with a throat 857 fixed between the two expansion tubes 856. A nozzle 858 is mounted outside the lens of the camera 83. A first connecting tube 859 and a second connecting tube 8510 are respectively installed at opposite ends of the two expansion tubes 856. The other end of the first connecting tube 859 is connected to a check valve on the piston cylinder 851, and the other end of the second connecting tube 8510 is fixedly connected to the nozzle 858. Both the first connecting tube 859 and the second connecting tube 8510 are flexible hoses. The expansion tubes 856 and the throat 857 in the pressurizing component utilize the Venturi effect to create a negative pressure at the throat 857, accelerating airflow and thus increasing the airflow speed from the nozzle 858, effectively cleaning the lens of the camera 83 and ensuring clear image capture.

[0028] It should be noted that both the first electric slide rail 3 and the second electric slide rail 81 can be cleaned by lifting to ensure the normal operation of the equipment. Additionally, automatically retractable shielding curtains can be installed on their moving parts to reduce the entry of impurities. A certain gap is maintained between the mounting frame 82 and the detection pool 2 to prevent the camera 83 from contacting the load-bearing structure when it moves.

[0029] The working principle of the above embodiments is as follows:

[0030] During testing, the testing pool 2 is used to hold the testing medium. The first electric slide rail 3 drives the gantry 4 to move laterally, and the hydraulic telescopic rod 5 drives the load structure to move longitudinally, so as to achieve precise positioning of the transformer in the testing pool 2.

[0031] During observation, the second electric slide rail 81 drives the mounting bracket 82 to move along the periphery of the detection pool 2, thereby causing the camera 83 to adjust the shooting angle. When the mounting bracket 82 moves, the ball bearing 854 rolls along the surface of the wave seat 86, driving the reciprocating rod 853 to drive the piston block 852 to reciprocate within the piston cylinder 851.

[0032] The piston cylinder 851 draws in air, compresses it, and then delivers it to the expansion tube 856 through the first connecting pipe 859. Through the Venturi effect, a negative pressure is formed at the throat 857, and finally a high-speed airflow is ejected from the nozzle 858 to clean the lens of the camera 83.

[0033] The installation, connection, or setting methods disclosed in this embodiment are all common mechanical connection methods. Any method that can achieve its beneficial effect can be implemented. In addition, the electrical components in this embodiment are all electrically connected to the main controller and the power supply. The main controller can be a conventional known device such as a computer that plays a control role. Those skilled in the art can control the electrical components through simple programming. Moreover, the existing disclosed power connection technology is also common knowledge in the field. Therefore, the specific structural composition and working principle will not be described in detail in this embodiment.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pressure-holding and sealing testing device for an oil-immersed transformer, comprising a testing pool (2) installed on the upper surface of a base (1) and testing equipment, characterized in that: The testing equipment consists of a first electric slide rail (3), a gantry frame (4), a hydraulic telescopic rod (5), and a load-bearing structure; An observation mechanism (8) is provided on the outside of the detection pool (2). The observation mechanism (8) consists of a moving component, a piston component (85) and a camera (83). The moving component includes a second electric slide rail (81) fixed to the upper surface of the base (1) and arranged around the detection pool (2). A mounting bracket (82) is connected to the second electric slide rail (81). The observation mechanism (8) also includes a wave seat (86) fixed to the outside of the detection pool (2) and used in conjunction with the piston assembly (85).

2. The oil-immersed transformer pressure-holding and sealing testing device according to claim 1, characterized in that: The detection pool (2) and the first electric slide rail (3) are both fixed on the upper surface of the base (1). There are two first electric slide rails (3). The gantry frame (4) is connected to the two first electric slide rails (3). The hydraulic telescopic rod (5) is fixed on the gantry frame (4).

3. The oil-immersed transformer pressure-holding and sealing testing device according to claim 1, characterized in that: The carrying structure includes a connecting frame (6) fixed to the output end of the hydraulic telescopic rod (5). The connecting frame (6) is provided with two trays (7) arranged vertically. The bottom tray (7) is fixed to the outer wall of the connecting frame (6), and the top tray (7) is slidably connected to the connecting frame (6). A positioning shaft for fixing the top tray (7) is inserted and installed inside the connecting frame (6).

4. The oil-immersed transformer pressure-holding and sealing testing device according to claim 1, characterized in that: The outer surface of the detection pool (2) is fixed with a limiting frame (84) that limits the position of the mounting frame (82), and the camera (83) is fixed to the top side of the mounting frame (82).

5. The oil-immersed transformer pressure-holding and sealing testing device according to claim 1, characterized in that: The piston assembly (85) includes a piston cylinder (851) fixed to the side of the mounting bracket (82) near the detection pool (2). A piston block (852) is provided inside the piston cylinder (851). A reciprocating rod (853) extending to the outside of the piston cylinder (851) is fixed on the outer wall of the piston block (852). A ball bearing (854) that abuts against the wave seat (86) is rotatably installed at the other end of the reciprocating rod (853).

6. The oil-immersed transformer pressure-holding and sealing testing device according to claim 5, characterized in that: A return spring (855) is installed between the outer surface of the reciprocating rod (853) and the piston cylinder (851), and a check valve is provided on the piston cylinder (851).

7. The oil-immersed transformer pressure-holding and sealing testing device according to claim 6, characterized in that: The piston assembly (85) also includes a pressurizing component fixed to the outside of the camera (83). The pressurizing component includes two expansion tubes (856), and a throat (857) is fixed between the two expansion tubes (856). A nozzle (858) is installed outside the lens of the camera (83). A first connecting pipe (859) and a second connecting pipe (8510) are respectively installed at one end of the two expansion tubes (856). The other end of the first connecting pipe (859) is connected to a check valve on the piston cylinder (851), and the other end of the second connecting pipe (8510) is fixedly connected to the nozzle (858).

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