An analysis device for extracting dissolved gases in transformer oil

Abstract

This utility model relates to an analytical device for extracting dissolved gases from transformer oil, including a degassing device body, a gas chromatograph body, an oil tank, and a filtration mechanism. The middle filter screen is fixed to the middle of the inner wall of the oil pipe to ensure its stability. The locking blocks on both sides of the upper filter screen are aligned with two guide grooves on the inner wall of the oil pipe and slid downwards along the grooves. Once at the bottom, the upper filter screen is rotated to allow the locking blocks to enter the arc-shaped groove, thus completing quick-release installation. For disassembly, it can be removed by rotating it in the opposite direction and lifting it upwards. The mounting cover is screwed into the threaded part at the bottom of the oil pipe, and the lower filter screen is placed inside the mounting cover. Transformer oil is poured in through the top of the oil pipe. The upper filter screen performs coarse filtration, intercepting large particles of impurities, thus reducing the burden on subsequent filters. The middle filter screen performs medium-efficiency filtration, filtering medium-sized particles, and the lower filter screen performs fine filtration, removing tiny particles, ensuring the purity of the oil entering the chromatograph.

Description

Technical Field

[0001] This utility model relates to the field of oil-immersed power transformer technology, specifically to an analytical device for extracting dissolved gases from transformer oil. Background Technology

[0002] Dissolved gas analysis (DGA) in transformer oil is an important means of monitoring the operating status of power transformers. By detecting the content of dissolved gases such as H2, CH4, C2H4, and C2H2 in the oil, internal insulation faults can be diagnosed at an early stage. In the current technology, impurities in transformer oil are prone to clogging the degassing device or chromatograph pipeline, and there is a lack of multi-stage filtration treatment for transformer oil, which affects the accuracy of detection.

[0003] For example, the authorized patent document with application number CN202320080882.1 discloses a device for extracting and analyzing dissolved gases in transformer oil, which includes a gas chromatograph body. A control panel is fixedly installed on one side of the gas chromatograph body, an addition tube is fixedly connected to one side of the gas chromatograph body, an oil injection tube is fixedly connected to one side of the addition tube, and a cooling mechanism is fixedly connected to one side of the gas chromatograph body. The cooling mechanism includes a box, and a fan is fixedly connected to the inner cavity of the box. The fan is started by an external controller.

[0004] The aforementioned patents lack multi-stage filtration for insulation, which can easily clog the chromatograph flow path, and the filters are not easy to remove for cleaning. Therefore, we need to provide an analytical device for extracting dissolved gases from transformer oil. Utility Model Content

[0005] The purpose of this invention is to provide an analytical device for extracting dissolved gases from transformer oil, thereby solving the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an analytical device for extracting dissolved gases from transformer oil, comprising:

[0007] The device includes a degassing unit, a gas chromatograph analyzer, an oil tank, and a filter mechanism. The gas chromatograph analyzer and the oil tank are both connected to the degassing unit via control valves. The top of the oil tank is equipped with a filter mechanism for intercepting impurities in the transformer oil.

[0008] The filtration mechanism includes an oil pipe, a multi-stage filter screen, and a funnel tube. The top of the oil storage tank is connected to the oil pipe through the funnel tube, and the multi-stage filter screen is located inside the oil pipe.

[0009] Preferably, the multi-stage filter includes an upper filter, a middle filter, and a lower filter arranged coaxially. The middle filter is fixed to the middle of the inner wall of the oil pipe. The upper filter, the middle filter, and the lower filter are distributed from top to bottom, and the pore sizes of the three filters are arranged in a gradient decreasing manner.

[0010] Preferably, it also includes an installation component for quick removal of the upper filter screen. The installation component includes a locking block, a guide groove, and an arc-shaped groove. The locking blocks are integrally machined on both sides of the upper filter screen. Guide grooves that are adapted to the locking blocks are opened on both sides of the inner wall of the oil pipe. The bottom of the two guide grooves are connected by an arc-shaped groove. The top of the upper filter screen is provided with a pry plate.

[0011] Preferably, the bottom of the lower filter screen is provided with a mounting cover that is threaded onto the inner wall of the oil pipe, and the mounting cover is provided with a crossbar inside to facilitate rotation of the mounting cover.

[0012] Preferably, the surface of the oil pipe is provided with an mounting ring with an annular groove, the top of the funnel tube is fixedly installed with an abutment ring that cooperates with the annular groove, the abutment ring is provided with an adhesive layer ring, and the top of the oil pipe is threaded with a sealing cap.

[0013] Preferably, it also includes a limiting component, which includes a frame, a push block, a contact frame, and a fixing ring. The fixing ring is fixedly installed on the surface of the oil pipe. The frame is located on one side of the gas chromatograph body. The contact frame for installing the fixing ring is slidably installed inside the frame. The semicircular part inside the contact frame is adapted to the surface of the oil pipe. The contact frame has a groove for contacting the fixing ring.

[0014] Preferably, a drive rod is rotatably mounted inside the frame, the upper end of the drive rod passes through the top of the frame and is provided with a handwheel, and the surface of the drive rod is threaded onto the push block.

[0015] Preferably, a protective plate for protecting the drive rod is slidably mounted on the surface of the push block, and the protective plate is located inside the frame.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] This invention uses a multi-stage filter to progressively intercept particulate matter and fibrous impurities, preventing clogging of the chromatograph flow path. The multi-stage filter effectively removes foreign matter from the oil, thereby preventing clogging of the chromatograph nozzle or contamination of the detector and improving data accuracy. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0019] Figure 2 This is a side perspective view of the structure of this utility model;

[0020] Figure 3 This is a perspective view of the limiting component of this utility model;

[0021] Figure 4 This is a partial exploded perspective view of the structure of this utility model;

[0022] Figure 5 This is a three-dimensional sectional view of the oil pipe of this utility model.

[0023] In the diagram: 1. Degassing device body; 2. Gas chromatograph body; 3. Oil tank; 4. Filtration mechanism; 41. Oil pipe; 42. Multi-stage filter screen; 421. Upper filter screen; 422. Middle filter screen; 423. Lower filter screen; 43. Funnel tube; 5. Mounting component; 51. Locking block; 52. Guide groove; 53. Arc groove; 6. Mounting cover; 7. Crossbar; 8. Mounting ring; 9. Contact ring; 10. Sealing cover; 11. Limiting component; 111. Frame; 112. Push block; 113. Contact frame; 114. Fixing ring; 12. Drive rod; 13. Protective plate; 14. Handwheel. Detailed Implementation

[0024] 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.

[0025] Please see Figure 1-5 This utility model provides a technical solution: an analytical device for extracting dissolved gases from transformer oil, comprising:

[0026] The degassing device body 1, the gas chromatograph body 2, the oil storage tank 3 and the filter mechanism 4 are all connected to the degassing device body 1 through control valve pipes. The top of the oil storage tank 3 is equipped with a filter mechanism 4 for intercepting impurities in the transformer oil.

[0027] The filtration mechanism 4 includes an oil pipe 41, a multi-stage filter screen 42, and a funnel pipe 43. The top of the oil tank 3 is connected to the oil pipe 41 through the funnel pipe 43, and the multi-stage filter screen 42 is located inside the oil pipe 41.

[0028] Specifically, the degassing device body 1, the gas chromatograph body 2, and the oil storage tank 3 are connected by a control valve pipe to form a closed oil circuit system, which can prevent external air from mixing in. The filter mechanism 4 is set on the top of the oil storage tank 3 to intercept impurities before the oil enters the oil storage tank 3, thereby preventing particulate matter, fibers and other pollutants from entering the degassing device or chromatograph and reducing the risk of equipment blockage. Among them, the multi-stage filter screen 42 is located inside the oil pipe 41 and adopts a gradient filtration design to intercept impurities of different sizes step by step, thereby extending the service life of the filter screen. Moreover, the filter mechanism 4 is independent of the oil storage tank 3, so there is no need to empty the oil tank during maintenance, which improves the convenience of operation.

[0029] The multi-stage filter element 42 includes an upper filter 421, a middle filter 422 and a lower filter 423 arranged coaxially. The middle filter 422 is fixed to the middle of the inner wall of the oil pipe 41. The upper filter 421, the middle filter 422 and the lower filter 423 are distributed from top to bottom, and the filter pore size of the three filters is arranged in a gradient decreasing manner.

[0030] It is worth noting that fixing the middle filter screen 422 to the middle of the inner wall of the oil pipe 41 ensures its stability and prevents it from loosening. Align the locking blocks 51 on both sides of the upper filter screen 421 with the two guide grooves 52 on the inner wall of the oil pipe 41, and slide them downwards along the grooves. When the bottom is reached, rotate the upper filter screen 421 to allow the locking blocks 51 to enter the arc-shaped groove 53, thus completing the quick-release installation. If disassembly is required, rotate in the opposite direction and lift it up to remove it. Screw the mounting cover 6 into the bottom thread of the oil pipe 41, and place the lower filter screen 423 into the mounting cover 6. Transformer oil is poured in through the top of the oil pipe 41, while the upper filter screen... 421 performs coarse filtration: intercepting large particulate impurities, thereby reducing the burden on subsequent filters. 422 performs medium-efficiency filtration, filtering medium-sized particles. 423 performs fine filtration, removing tiny particles. This ensures the purity of the oil entering the chromatograph. The gradient pore size design (upper filter 421 100μm, middle filter 422 50μm, lower filter 423 20μm) optimizes filtration efficiency. It can be disassembled and cleaned without tools, making it suitable for frequent maintenance scenarios. It avoids rapid clogging of single-layer filters, effectively protecting the degassing unit and chromatograph, and reducing malfunctions caused by particulate contamination.

[0031] It also includes a mounting component 5, which is used for quick release of the upper filter screen 421. The mounting component 5 includes a locking block 51, a guide groove 52 and an arc groove 53. The upper filter screen 421 has locking blocks 51 integrally machined on both sides. The inner wall of the oil pipe 41 has guide grooves 52 that are adapted to the locking blocks 51 on both sides. The bottom of the two guide grooves 52 are connected to the arc groove 53. The top of the upper filter screen 421 is provided with a lever part.

[0032] It should be noted that when installing the upper filter screen 421, align the locking blocks 51 on both sides of the upper filter screen 421 with the guide groove 52 on the inner wall of the oil pipe 41, slide it vertically downward along the guide groove 52 until the locking blocks 51 reach the bottom of the groove, rotate the upper filter screen 421 to make the locking blocks 51 slide into the arc groove 53 to complete the fixation. When removing the upper filter screen 421, rotate the upper filter screen 421 in the opposite direction through the lever part to make the locking blocks 51 return from the arc groove 53 to the guide groove 52, lift the filter screen vertically upward, and it can be quickly removed for cleaning or replacement. No tools are required, and the filter screen can be replaced by hand.

[0033] The bottom of the lower filter screen 423 is provided with a mounting cover 6 that is threaded onto the inner wall of the oil pipe 41, and the inside of the mounting cover 6 is provided with a crossbar 7 that facilitates the rotation of the mounting cover 6;

[0034] The mounting cover 6 at the bottom of the lower filter screen 423 is threaded onto the inner wall of the oil pipe 41, which facilitates the installation and removal of the lower filter screen 423. A crossbar 7 is located inside the mounting cover 6, which facilitates the rotation and adjustment of the mounting cover 6.

[0035] The surface of the oil pipe 41 is provided with an mounting ring 8 with an annular groove. The top of the funnel pipe 43 is fixedly installed with an abutment ring 9 that cooperates with the annular groove. The abutment ring 9 is a rubber layer ring. The top of the oil pipe 41 is threaded with a sealing cap 10.

[0036] It should be noted that by aligning the rubber layer contact ring 9 at the top of the funnel tube 43 with the annular groove on the surface of the oil pipe 41 and applying slight pressure, the rubber layer contact ring 9 is fully embedded in the annular groove, thus forming a preliminary seal. By tightening the sealing cap 10 at the threaded top of the oil pipe 41, external contaminants can be prevented from entering. It can be tightened manually and also serves as a seal. In this process, the rubber layer contact ring 9 works in conjunction with the annular groove, and the flexible rubber layer is deformed under pressure to fill the microscopic gaps. The sealing cap 10 seals the top of the oil pipe 41, preventing oil evaporation or dust intrusion. The sealing level can reach IP54.

[0037] It also includes a limiting component 11, which includes a frame 111, a push block 112, a contact frame 113 and a fixing ring 114. The fixing ring 114 is fixedly installed on the surface of the oil pipe 41. The frame 111 is located on one side of the gas chromatograph body 2. The contact frame 113 for installing the fixing ring 114 is slidably installed inside the frame 111. The semi-circular part inside the contact frame 113 is adapted to the surface of the oil pipe 41. The contact frame 113 is provided with a groove for abutting the fixing ring 114.

[0038] It is worth noting that by passing the oil pipe 41 through the semi-circular groove of the contact frame 113, the fixing ring 114 on the surface of the oil pipe 41 is aligned with the groove inside the contact frame 113. By rotating the handwheel 14 on the top of the frame 111, the internal drive rod 12 is driven to rotate. The drive rod 12 pushes the push block 112 horizontally through the thread, forcing the contact frame 113 to slide towards the oil pipe 41, applying downward pressure to the oil pipe 41. The oil pipe 41 can be stably fixed in a short time, and the removal of the oil pipe 41 is convenient.

[0039] A drive rod 12 is rotatably mounted inside the frame 111. The upper end of the drive rod 12 passes through the top of the frame 111 and is provided with a handwheel 14. The surface of the drive rod 12 is threaded onto the push block 112.

[0040] The rotating handwheel 14 drives the drive rod 12 to rotate, and the external thread on the surface of the drive rod 12 engages with the internal thread of the push block 112, converting the rotational motion into the linear motion of the push block 112. The push block 112 moves forward and pushes the contact frame 113 to slide towards the oil pipe 41, thus completing the clamping of the fixed ring 114. The threaded transmission converts the handwheel torque into axial thrust (the force amplification ratio can reach 5:1), and only 2Nm of torque is needed to generate a clamping force of 500N.

[0041] A protective plate 13 for protecting the drive rod 12 is slidably mounted on the surface of the push block 112, and the protective plate 13 is located inside the frame 111;

[0042] When the push block 112 moves, the guard plate 13 fixed on the surface of the push block 112 slides synchronously, always covering the exposed part of the drive rod 12. The guard plate 13 is made of stainless steel sheet, which shields the drive rod 12 in real time as the push block 112 moves, preventing oil or dust from accumulating on the threads, completely isolating the rotating drive rod 12, and preventing the operator's clothes or tools from getting caught in.

[0043] It should be noted that the components involved in this application, such as the degassing device body 1 and the gas chromatograph body 2, are all implemented using existing technologies. Their specific structures and working principles are well known to those skilled in the art, and therefore will not be described in detail. The innovation of this application lies in the filtration system. This application mainly focuses on innovative improvements to the filtration system of existing degassing analysis devices. The degassing device body 1 can adopt a conventional thermal degassing or ultrasonic degassing structure, and the gas chromatograph body 2 is a commercially available standard device.

[0044] This device: The transformer oil to be tested first enters the multi-stage filtration mechanism 4 through the funnel tube 43. The oil passes through the three-stage gradient filtration of the upper filter screen 421, the middle filter screen 422 and the lower filter screen 423 in sequence, effectively intercepting impurities such as metal particles and fibers. The filtered oil sample enters the oil storage tank 3 for temporary storage to avoid direct contamination of precision instruments. The quick-release filter screen design improves maintenance efficiency and ensures long-term stable operation of the system.

[0045] The pure oil sample in the oil storage tank 3 is introduced into the degassing device body 1 through the control valve pipe. Under a constant temperature environment of 50-80℃, the device maintains a high vacuum of 0.1kPa, which allows dissolved gases to be efficiently extracted from the oil. The gas phase components are transported to the analysis unit through a dedicated pipeline. The remaining oil can be recycled or reinjected into the transformer. The extracted mixed gas enters the gas chromatograph body 2. Driven by the carrier gas, the gas components are separated in the chromatographic column due to differences in adsorption characteristics. Subsequently, qualitative and quantitative analysis is performed by TCD and FID, which can accurately identify the characteristic gases of early transformer faults.

[0046] 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. An analytical apparatus for extracting dissolved gases from transformer oil, characterized in that, include: The degassing device body (1), the gas chromatograph body (2), the oil tank (3) and the filter mechanism (4) are connected to the degassing device body (1) through control valve pipes. The top of the oil tank (3) is equipped with a filter mechanism (4) for intercepting impurities in transformer oil. The filtration mechanism (4) includes an oil pipe (41), a multi-stage filter element (42), and a funnel tube (43). The top of the oil storage tank (3) is connected to the oil pipe (41) through the funnel tube (43), and the multi-stage filter element (42) is located inside the oil pipe (41).

2. The analytical apparatus for extracting dissolved gases from transformer oil according to claim 1, characterized in that: The multi-stage filter element (42) includes an upper filter (421), a middle filter (422), and a lower filter (423) arranged coaxially. The middle filter (422) is fixed to the middle part of the inner wall of the oil pipe (41). The upper filter (421), the middle filter (422), and the lower filter (423) are distributed from top to bottom, and the filter pore size of the three filters is arranged in a gradient decreasing manner.

3. The analytical apparatus for extracting dissolved gases from transformer oil according to claim 2, characterized in that: It also includes an installation component (5), which is used for quick disassembly of the upper filter screen (421). The installation component (5) includes a locking block (51), a guide groove (52), and an arc groove (53). The upper filter screen (421) has locking blocks (51) integrally machined on both sides. The inner wall of the oil pipe (41) has guide grooves (52) adapted to the locking blocks (51) on both sides. The bottom of the two guide grooves (52) are connected by an arc groove (53). The top of the upper filter screen (421) is provided with a lever.

4. The analytical apparatus for extracting dissolved gases from transformer oil according to claim 2, characterized in that: The bottom of the lower filter screen (423) is provided with a mounting cover (6) that is threaded onto the inner wall of the oil pipe (41), and the inside of the mounting cover (6) is provided with a crossbar (7) to facilitate the rotation of the mounting cover (6).

5. The analytical apparatus for extracting dissolved gases from transformer oil according to claim 4, characterized in that: The surface of the oil pipe (41) is provided with an mounting ring (8) with an annular groove. The top of the funnel pipe (43) is fixedly installed with an abutment ring (9) that cooperates with the annular groove. The abutment ring (9) is a rubber layer ring. The top of the oil pipe (41) is threaded with a sealing cap (10).

6. The analytical apparatus for extracting dissolved gases from transformer oil according to claim 1, characterized in that: It also includes a limiting component (11), which includes a frame (111), a push block (112), a contact frame (113), and a fixing ring (114). The fixing ring (114) is fixedly installed on the surface of the oil pipe (41). The frame (111) is located on one side of the gas chromatograph body (2). The contact frame (113) for installing the fixing ring (114) is slidably installed inside the frame (111). The semi-circular part inside the contact frame (113) is adapted to the surface of the oil pipe (41). The contact frame (113) is provided with a groove for contacting the fixing ring (114).

7. The analytical apparatus for extracting dissolved gases from transformer oil according to claim 6, characterized in that: A drive rod (12) is rotatably mounted inside the frame (111). The upper end of the drive rod (12) passes through the top of the frame (111) and is provided with a handwheel (14). The surface of the drive rod (12) is threaded onto the push block (112).

8. The analytical apparatus for extracting dissolved gases from transformer oil according to claim 7, characterized in that: The push block (112) is slidably mounted with a guard plate (13) for protecting the drive rod (12), and the guard plate (13) is located inside the frame (111).

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