Capacitor oil injection system

Abstract

The utility model provides a capacitor oil injection system. The capacitor oil injection system comprises an upper cover which is provided with an oil injection hole and an elastic sheet mounting hole, the upper cover comprises an elastic sheet, and the elastic sheet is movably arranged at the elastic sheet mounting hole to block or open the elastic sheet mounting hole; the exhaust oil jacking device comprises a main pipeline, a connecting part, an oil jacking branch pipeline and an exhaust branch pipeline, the oil jacking branch pipeline and the exhaust branch pipeline are both communicated with the main pipeline, and the exhaust branch pipeline is higher than the oil jacking branch pipeline; the exhausting and oil jacking device has an exhausting state and an oil jacking state; and the power assembly is used for conveying the oil liquid in the shell into the oil drum or conveying the liquid insulating medium into the shell and comprises a pipeline and a power device. According to the utility model, the problem that the compensation amount of the expander to the insulating oil in the prior art has errors is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of capacitors, in particular to a capacitor oil filling system. Background Art

[0002] At present, power capacitors are capacitors used in power networks, and are widely used in power systems, high voltage tests, laser technology, high energy physics, industrial and agricultural production, and daily life, such as: high voltage parallel capacitors, low voltage parallel capacitors, self-healing low voltage parallel capacitors, collective parallel capacitors, series capacitors, high voltage AC filter capacitors, AC motor capacitors, coupling capacitors, capacitive voltage dividers, capacitive capacitors, circuit breaker capacitors, pulse capacitors, and compressed gas standard capacitors. Among them, capacitive voltage dividers, coupling capacitors, capacitive voltage dividers for high voltage measurement, resonant capacitors in high voltage series resonant test equipment, and circuit breaker voltage-equalizing capacitors all have common structural characteristics, that is, the shells of the above electrical products are all insulated cylinders, porcelain or silicone rubber composite jackets. As the ambient temperature changes during the operation of products using this shell, the internal oil temperature and oil volume also change over a large range. In order to ensure the reliable operation of the product, an internal external oil type is usually used to compensate for the above oil volume changes. Specifically, this type of metal bellows expander is a volume compensator used to compensate for the change in oil volume caused by temperature changes in the liquid insulating oil inside the product. It is an ideal device for fully sealing the solid line of the insulating tube shell high-voltage capacitor to prevent the insulating oil from moisture, aging, and deterioration. When the oil temperature changes, the internal gas is compressed to change the volume of the expander, ultimately achieving compensation for the insulating oil volume.

[0003] In the prior art, the insulating tube shell high-voltage capacitor undergoes the processes of component rolling-core assembly-core shell-vacuum drying and impregnation during the production process. Among them, the vacuum drying and impregnation process requires the capacitor to be heated, vacuumized, oiled, and impregnated, and heating and vacuuming are not suitable for metal bellows expanders. Therefore, it is necessary to first vacuum dry the semi-finished capacitor with the capacitor core, and then open the insulating tube shell to install the metal bellows expander. However, at this time, the installed expander is at the lowest temperature state and the corresponding height is the highest, not at the height corresponding to the product temperature at this time, which affects the compensation amount of the insulating oil and even affects the normal operation of the capacitor. Utility Model Content

[0004] The main purpose of the utility model is to provide a capacitor oil filling system to solve the problem in the prior art that the expansion device has an error in the compensation amount of insulating oil liquid, which affects the normal operation of the capacitor.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a capacitor oil filling system, comprising: an upper cover, which is used to cover the shell of the capacitor, the upper cover has an oil filling hole and a spring installation hole, the upper cover includes a spring, and the spring can be movably arranged at the spring installation hole to block or open the spring installation hole; an exhaust oil-top device, comprising a main line, a connecting part, an oil-top branch line and an exhaust branch line, the connecting part is arranged at the end of the main line for communicating with the oil filling hole, the oil-top branch line and the exhaust branch line are both connected to the main line, and the height of the exhaust branch line is higher than the height of the oil-top branch line; the exhaust oil-top device has an exhaust state and an oil-top state; a power component, which is used to transport the oil in the shell to the oil barrel or to transport the liquid insulating medium to the shell, and the power component includes a pipeline and a power device arranged on the pipeline.

[0006] Furthermore, the exhaust and oil-topping device has an exhaust state and an oil-topping state. When the exhaust and oil-topping device is in the exhaust state, one end of the pipeline is connected to the liquid insulating medium and the other end of the pipeline is connected to the oil-topping branch pipeline, so that the gas stored in the capacitor is discharged through the exhaust branch pipeline; when the exhaust and oil-topping device is in the oil-topping state, the exhaust branch pipeline is closed to inject liquid insulating medium into the shell through the oil-topping branch pipeline, the main pipeline, the connecting part and the oil filling hole in sequence.

[0007] Furthermore, the exhaust oil-top device also includes: a pressure gauge, which is arranged on the end of the main line away from the connecting part; and a control module, which is connected to both the pressure gauge and the power unit; wherein, when the exhaust oil-top device is in the oil-top state and the pressure value of the pressure gauge reaches a preset pressure value, the power unit is controlled to stop running through the control module.

[0008] Furthermore, the exhaust top oil device also includes a first three-way structure and a first control valve, the two straight pipes of the first three-way structure are connected to the main pipeline, and the side pipe of the first three-way structure forms an exhaust branch pipeline or is connected to the exhaust branch pipeline; the first control valve is arranged on the side pipeline or the exhaust branch pipeline; and / or, the exhaust top oil device also includes a second three-way structure and a second control valve, the two straight pipes of the second three-way structure are connected to the main pipeline, and the side pipe of the second three-way structure forms an exhaust branch pipeline or is connected to the exhaust branch pipeline; the second control valve is arranged on the side pipeline or the exhaust branch pipeline.

[0009] Furthermore, the upper cover includes: a cover body, having an oil filling hole and an expander connecting hole, and the spring mounting hole and the oil filling hole are arranged at intervals on the cover body; a fastener, which connects the spring sheet and the cover body by passing the fastener through the spring mounting hole and the spring sheet; wherein, when the connecting portion extends into the oil filling hole and is connected with the oil filling hole, at least part of the spring sheet is pushed open by the connecting portion to be separated from the spring sheet mounting hole.

[0010] Furthermore, the oil filling hole includes: a first hole segment, a first end of the first hole segment passes through the first surface of the upper cover; a second hole segment, a first end of the second hole segment is connected to the second end of the first hole segment, and the second end of the second hole segment passes through the second surface of the upper cover; wherein the aperture of the first hole segment is larger than the aperture of the second hole segment so as to form a step surface when the two are connected; and the length of the connecting portion is larger than the length of the oil filling hole.

[0011] Furthermore, the connecting part includes: a first connecting tube, used to extend into the first hole section and adapt to the first hole section; a second connecting tube, connected to the first connecting tube and used to extend into the second hole section; wherein the second connecting tube has a guide portion at the open end away from the first connecting tube, and the guide portion is located on the tube wall of the second connecting tube.

[0012] Furthermore, the guide portion is at least one of an arc-shaped notch, a tapered hole, a tapered surface and an inclined surface.

[0013] Furthermore, the power device is a gear pump.

[0014] Further, the expander connection hole and / or the spring sheet mounting hole are blind holes; or, the expander connection hole and / or the spring sheet mounting hole are threaded holes.

[0015] By applying the technical solution of the utility model, the capacitor oil filling system includes an upper cover, an exhaust oil-top device and a power assembly. The upper cover is used to cover the shell of the capacitor. The upper cover has an oil filling hole and a spring installation hole. The upper cover includes a spring. The spring can be movably arranged at the spring installation hole to block or open the spring installation hole. The exhaust oil-top device includes a main line, a connecting part, an oil-top branch line and an exhaust branch line. The connecting part is arranged at the end of the main line to be connected with the oil filling hole. The oil-top branch line and the exhaust branch line are both connected with the main line. The height of the exhaust branch line is higher than that of the oil-top branch line. The exhaust oil-top device has an exhaust state and an oil-top state. The power assembly is used to transport the oil in the shell to the oil barrel or to transport the liquid insulating medium to the shell. The power assembly includes a pipeline and a power device arranged on the pipeline. In this way, the exhaust oil-top device has an exhaust state and an oil-top state. In order to compress the expander to the height corresponding to the required temperature, oil-top exhaust is required. During the installation of the exhaust oil jacking device, the connection part is connected to the oil filling hole, one end of the pipeline is connected to the liquid insulating medium, and the other end of the pipeline is connected to the oil jacking branch pipeline, so that the gas stored in the capacitor is discharged through the exhaust branch pipeline. At this time, the exhaust oil jacking device is in the exhaust state. After the exhaust is completed, the exhaust branch pipeline is closed to inject liquid insulating medium into the shell through the oil jacking branch pipeline, the main pipeline, the connection part and the oil filling hole in sequence. At this time, the exhaust oil jacking device is in the oil jacking state and the expander returns to the height at room temperature. The expander will realize its own function with the temperature change in the later stage, thereby solving the problem in the prior art that the expander has an error in the compensation amount of the insulating oil liquid and affects the normal operation of the capacitor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 A schematic diagram of the structure of an embodiment of the capacitor oil filling system according to the utility model after being connected to a capacitor is shown;

[0018] Figure 2 Shows Figure 1 A schematic diagram of the structure of the exhaust oil-top device of the capacitor oil filling system;

[0019] Figure 3 Shows Figure 1 A bottom view of the upper cover in FIG.

[0020] Figure 4 Shows Figure 3 Bottom view of the upper cover after the shrapnel is removed;

[0021] Figure 5 Shows Figure 4 A side perspective view of the upper cover in FIG.

[0022] Figure 6 Shows Figure 4 The front view of the upper cover and the shell after assembly;

[0023] Figure 7 Shows Figure 1 A schematic diagram of the structure of the capacitor oil filling system when discharging the liquid medium inside the capacitor;

[0024] Figure 8 Shows Figure 1 Schematic diagram of the structure of the capacitor oil filling system when the exhaust is completed and connected to the second container.

[0025] The above drawings include the following reference numerals:

[0026] 10. Upper cover; 11. Oil filling hole; 111. First hole section; 112. Second hole section; 12. Expander connection hole; 13. Cover body; 14. Spring clip installation hole; 15. Spring clip; 16. Core lead connection hole;

[0027] 20. Shell;

[0028] 30. Main road;

[0029] 40. Connecting portion; 41. First connecting tube; 42. Second connecting tube; 421. Guide portion;

[0030] 50. Top oil branch pipeline;

[0031] 60. Exhaust branch pipe;

[0032] 70. Power assembly; 71. Pipeline; 72. Power unit;

[0033] 80. Pressure gauge;

[0034] 91. First three-way structure; 92. First control valve; 93. Second three-way structure; 94. Second control valve;

[0035] 100. a first container;

[0036] 110. a second container;

[0037] 120. Expander. DETAILED DESCRIPTION

[0038] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0039] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0040] In the present invention, unless otherwise specified, directional words such as "up" and "down" are usually used in reference to the directions shown in the drawings, or in reference to the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "left" and "right" are usually used in reference to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0041] In order to solve the problem in the prior art that the expansion device has an error in the compensation amount of insulating oil and affects the normal operation of the capacitor, the present application provides a capacitor oil filling system.

[0042] like Figures 1 to 8As shown, the capacitor oil filling system includes an upper cover 10, an exhaust oil filling device and a power assembly 70. The upper cover 10 is used to cover the shell 20 of the capacitor. The upper cover 10 has an oil filling hole 11 and a spring installation hole 14. The upper cover 10 includes a spring 15. The spring 15 can be movably arranged at the spring installation hole 14 to block or open the spring installation hole 14. The exhaust oil filling device includes a main line 30, a connecting portion 40, an oil filling branch line 50 and an exhaust branch line 60. The connecting portion 40 is arranged at the end of the main line 30 to communicate with the oil filling hole 11. The oil filling branch line 50 and the exhaust branch line 60 are both connected to the main line 30. The height of the exhaust branch line 60 is higher than the height of the oil filling branch line 50. The exhaust oil filling device has an exhaust state and an oil filling state. The power assembly 70 is used to transport the oil in the housing 20 to the oil barrel or to transport the liquid insulating medium into the housing 20 . The power assembly 70 includes a pipeline 71 and a power device 72 arranged on the pipeline 71 .

[0043] By applying the technical solution of this embodiment, the exhaust oil-top device has an exhaust state and an oil-top state. In order to compress the expander 120 to the height corresponding to the required temperature, it is necessary to implement oil-top exhaust. During the installation of the exhaust oil-top device, the connection part 40 is connected to the oil filling hole 11, one end of the pipeline 71 is connected to the liquid insulating medium, and the other end of the pipeline 71 is connected to the oil-top branch pipeline 50, so that the gas stored in the capacitor is discharged through the exhaust branch pipeline 60. At this time, the exhaust oil-top device is in the exhaust state. After the exhaust is completed, the exhaust branch pipeline 60 is closed to inject liquid insulating medium into the shell 20 through the oil-top branch pipeline 50, the main pipeline 30, the connection part 40 and the oil filling hole 11 in sequence. At this time, the exhaust oil-top device is in the oil-top state and the expander 120 returns to the height at room temperature. The expander 120 will realize its own function with the temperature change in the later stage, thereby solving the problem that the expander has an error in the compensation amount of the insulating oil in the prior art and affects the normal operation of the capacitor.

[0044] In this embodiment, the exhaust and oil-top device has an exhaust state and an oil-top state. When the exhaust and oil-top device is in the exhaust state, one end of the pipeline 71 is connected to the liquid insulating medium, and the other end of the pipeline 71 is connected to the oil-top branch pipeline 50, so that the gas stored in the capacitor is discharged through the exhaust branch pipeline 60. When the exhaust and oil-top device is in the oil-top state, the exhaust branch pipeline 60 is closed to inject the liquid insulating medium into the housing 20 through the oil-top branch pipeline 50, the main pipeline 30, the connecting portion 40 and the oil filling hole 11 in sequence.

[0045] In this embodiment, the pipeline 71 is a hose.

[0046] like Figure 1 and Figure 2As shown, the exhaust oil-top device also includes a pressure gauge 80 and a control module. The pressure gauge 80 is arranged on the end of the main pipeline 30 away from the connecting portion 40, and the control module is connected to both the pressure gauge 80 and the power device 72. Among them, when the exhaust oil-top device is in the oil-top state and the pressure value of the pressure gauge 80 reaches the preset pressure value, the power device 72 is controlled to stop running through the control module. The preset pressure value is greater than or equal to 0.02MPa and less than or equal to 0.06MPa. In this way, during the oil-top process of the exhaust oil-top device, when the display value of the pressure gauge 80 reaches the preset pressure value, it represents that the oil-top operation of the exhaust oil-top device is completed. At this time, the expander 120 returns to the height at room temperature, and it will realize its own function with the temperature change in the later stage. At the same time, the above-mentioned setting can realize the automatic completion of the oil-top operation, thereby improving the intelligence level of the exhaust oil-top device.

[0047] In this embodiment, the preset pressure value is 0.04 MPa.

[0048] It should be noted that the preset pressure value is not limited thereto and can be adjusted according to working conditions and usage requirements. Optionally, the preset pressure value is 0.025MPa, or 0.03MPa, or 0.035MPa, or 0.045MPa, or 0.05MPa, or 0.055MPa.

[0049] Optionally, the exhaust top oil device further includes a first three-way structure 91 and a first control valve 92, wherein the two straight pipes of the first three-way structure 91 are connected to the main pipeline 30, and the side pipe of the first three-way structure 91 forms a top oil branch pipeline 50 or is connected to the top oil branch pipeline 50; the first control valve 92 is arranged on the side pipeline or the top oil branch pipeline 50; and / or, the exhaust top oil device further includes a second three-way structure 93 and a second control valve 94, wherein the two straight pipes of the second three-way structure 93 are connected to the main pipeline 30, and the side pipe of the second three-way structure 93 forms an exhaust branch pipeline 60 or is connected to the exhaust branch pipeline 60; the second control valve 94 is arranged on the side pipeline or the exhaust branch pipeline 60. In this way, during the operation of the exhaust top oil device, the on-off state in the pipeline can be controlled by the first control valve 92, thereby reducing the control difficulty of the exhaust top oil device and the operation difficulty of the staff. At the same time, the above-mentioned setting makes the structure selection and setting method of the exhaust top oil device more flexible to meet different use requirements and working conditions, and also improves the processing flexibility of the staff.

[0050] In this embodiment, the two straight pipes of the first three-way structure 91 are connected to the main pipeline 30, the side pipe of the first three-way structure 91 is connected to the top oil branch pipeline 50, and the first control valve 92 is arranged on the top oil branch pipeline 50 to control the on-off state of the top oil branch pipeline 50. In this way, the above arrangement makes it easier and simpler to disassemble and assemble the first three-way structure 91, the main pipeline 30, and the top oil branch pipeline 50, reduces the difficulty of disassembly and assembly of the three, and also reduces the processing cost and difficulty of the exhaust top oil device.

[0051] In this embodiment, the two straight pipes of the second three-way structure 93 are connected to the main pipeline 30, the side pipe of the second three-way structure 93 is connected to the exhaust branch pipeline 60, and the second control valve 94 is arranged on the exhaust branch pipeline 60 to control the on-off state of the exhaust branch pipeline 60. In this way, the above arrangement makes it easier and simpler to disassemble and assemble the second three-way structure 93, the main pipeline 30, and the exhaust branch pipeline 60, reduces the difficulty of disassembly and assembly of the three, and also reduces the processing cost and difficulty of the exhaust oil jacking device.

[0052] like Figure 3 and Figure 4 As shown, the upper cover 10 includes a cover body 13, a spring 15 and a fastener. The cover body 13 has an oil filling hole 11, an expander connecting hole 12 and a spring installation hole 14, and the spring installation hole 14 and the oil filling hole 11 are arranged at intervals on the cover body 13. The spring 15 and the cover body 13 are connected by inserting the fastener through the spring installation hole 14 and the spring 15. Among them, when the connecting part 40 extends into the oil filling hole 11 and communicates with the oil filling hole 11, at least part of the spring 15 is pushed open by the connecting part 40 and avoids the spring installation hole 14. In this way, after the exhaust oil jacking device is assembled with the upper cover 10, the connecting part 40 pushes the spring 15 and then extends into the oil filling hole 11 to realize the exhaust and oil filling operation of the shell 20. After the exhaust oil jacking device completes the oil jacking operation and is removed from the upper cover 10, the spring 15 restores its elastic deformation and blocks the oil filling hole 11. At the same time, the above arrangement makes the assembly and disassembly of the spring piece 15 and the upper cover 10 easier and simpler, thereby reducing the difficulty of assembly and disassembly of the two.

[0053] In this embodiment, at least a portion of the expander 120 extends into the expander connecting hole 12 and cooperates with the expander connecting hole 12 so that the expander 120 is installed in the housing 20 .

[0054] Specifically, the oil filling hole 11, the expander connecting hole 12 and the spring installation hole 14 are arranged at intervals.

[0055] like Figure 5As shown, the oil filling hole 11 includes a first hole section 111 and a second hole section 112. The first end of the first hole section 111 passes through the first surface of the upper cover 10, the first end of the second hole section 112 is connected to the second end of the first hole section 111, and the second end of the second hole section 112 passes through the second surface of the upper cover 10. Among them, the aperture of the first hole section 111 is larger than the aperture of the second hole section 112, so that a step surface is formed when the two are connected. The length of the connecting portion 40 is greater than the length of the oil filling hole 11, and the length difference between the two is greater than or equal to 8mm and less than or equal to 12mm. In this way, the above-mentioned setting makes the oil filling hole 11 a stepped through hole to match the shape of the connecting portion 40, thereby improving the exhaust and oil jacking efficiency of the exhaust and oil jacking device, and greatly improving the operating efficiency of the capacitor oil filling system.

[0056] In this embodiment, the difference between the length of the connecting portion 40 and the length of the oil filling hole 11 is 10 mm.

[0057] It should be noted that the difference between the length of the connecting portion 40 and the length of the oil injection hole 11 is not limited thereto, and can be adjusted according to working conditions and usage requirements. Optionally, the difference between the length of the connecting portion 40 and the length of the oil injection hole 11 is 8.5 mm, or 9 mm, or 9.5 mm, or 10.5 mm, or 11 mm, or 11.5 mm.

[0058] like Figure 2 As shown, the connecting portion 40 includes a first connecting cylinder 41 and a second connecting cylinder 42. The first connecting cylinder 41 is used to extend into the first hole section 111 and match the first hole section 111, and the second connecting cylinder 42 is connected to the first connecting cylinder 41 and is used to extend into the second hole section 112. Among them, the opening end of the second connecting cylinder 42 away from the first connecting cylinder 41 has a guide portion 421, and the guide portion 421 is located on the cylinder wall of the second connecting cylinder 42. In this way, the above-mentioned arrangement ensures that the connecting portion 40 can be matched with the shape of the oil filling hole 11 to improve the exhaust and oil filling efficiency of the exhaust and oil filling device; on the other hand, it improves the flow smoothness of the liquid medium in the connecting portion 40.

[0059] In this embodiment, the outer diameter of the first connecting tube 41 is greater than the outer diameter of the second connecting tube 42 .

[0060] Optionally, there are multiple guide portions 421 , and the multiple guide portions 421 are arranged at intervals along the circumference of the second connecting tube 42 , which further improves the flow smoothness of the liquid medium discharged from the connecting portion 40 .

[0061] Optionally, the guide portion 421 is at least one of an arc notch, a tapered hole, a tapered surface and an inclined surface. In this way, the above arrangement makes the structure selection of the guide portion 421 more diverse to meet different usage requirements and working conditions, and also improves the processing flexibility of the staff.

[0062] In this embodiment, the guide portion 421 is an arc-shaped notch, and the depth of the arc-shaped notch is greater than 3 mm and less than or equal to 7 mm. In this way, under the premise of ensuring the smooth flow of the liquid medium in the connecting portion 40, the above arrangement improves the structural strength of the connecting portion 40, thereby extending the service life of the connecting portion 40.

[0063] In this embodiment, the depth of the arc-shaped notch is 5 mm.

[0064] It should be noted that the depth of the arc-shaped notch is not limited thereto and can be adjusted according to working conditions and usage requirements. Optionally, the depth of the arc-shaped notch is 3.5 mm, or 4.0 mm, or 4.5 mm, or 5.5 mm, or 6.0 mm, or 6.5 mm.

[0065] In this embodiment, the power device 72 is a gear pump. Thus, the above arrangement makes the structure of the power device 72 simpler, easier to process and realize, thereby reducing the processing cost and difficulty of the power device 72.

[0066] Specifically, the power supply of the gear pump is AC220V, which is convenient for operation. The speed of the motor is 1800rpm, the power is 100w, and the delivery capacity is 1.44L / min.

[0067] Optionally, the gear pump is a single-phase gear pump.

[0068] Optionally, the expander connection hole 12 and / or the spring-piece mounting hole 14 are blind holes; or, the expander connection hole 12 and / or the spring-piece mounting hole 14 are threaded holes. Thus, the above arrangement makes the structures of the expander connection hole 12 and the spring-piece mounting hole 14 simpler, easier to process and realize, and reduces the processing cost and difficulty of the upper cover 10.

[0069] In this embodiment, the oil filling hole 11 is a stepped threaded hole.

[0070] like Figure 3 and Figure 4 As shown, the upper cover 10 also has a core lead connection hole 16, and the core lead connection hole 16 is a blind hole with threads.

[0071] In this embodiment, the spring piece 15 is made of stainless steel, which has a high elastic limit, fatigue limit, impact toughness and good heat treatment performance.

[0072] Optionally, the pressure gauge 80 has a measuring range of 0 to 0.1 MPa, so as to display the internal pressure value of the housing 20 in real time.

[0073] In this embodiment, the first three-way structure 91 , the first control valve 92 , the second three-way structure 93 , the second control valve 94 and the connecting portion 40 are all made of stainless steel.

[0074] Specifically, the working principle of the capacitor oil filling system is as follows:

[0075] Step 1: The capacitor without the expander is subjected to vacuum drying and impregnation process in a vacuum tank. When in operation, it is heated first, and then maintained for a certain time after being heated to a certain temperature. The heat is turned off and vacuumed. After the vacuum reaches the process requirement value, it is maintained for a certain time, and then oil is filled, impregnated, and taken out of the tank. When taking out of the tank, the housing 20 is placed upright with the upper cover 10 facing upwards, and the upper cover 10 is removed. At this time, the capacitor is full of oil.

[0076] Step 2: Draining the liquid medium inside the capacitor

[0077] Insert one end of the pipe 71 into the housing 20, and put the other end of the pipe 71 into the first container 100 (oil drum), turn on the switch of the power device 72, and discharge the liquid medium inside the capacitor. The volume of the discharged liquid medium is equal to the volume of the expander 120. After it is in place, turn off the power device 72 and take out the pipe 71.

[0078] Step 3: Install the expander 120

[0079] The expander 120 is placed inside the shell 20 , and at this time, the expander 120 floats on the surface of the liquid medium. The upper cover 10 is placed in a suitable position, and the top bolts of the expander 120 are screwed into the expander connecting holes 12 and tightened, and then the upper cover 10 is tightened.

[0080] Step 4: Micro-replenishment of oil

[0081] Use a tool to push the spring piece 15 below the oil filling hole 11 open by about 5mm and hold it, connect one end of the pipe 71 to the oil filling hole 11, put the other end of the pipe 71 into the second container 110 with a scale filled with pre-processed qualified liquid insulating medium, open the power device 72 to achieve a small amount of oil replenishment, and immediately close the power device 72 after observing that the oil filling hole 11 is full of oil, and release the tool at the same time to restore the spring piece 15 to the closed state. The oil replenishment is completed, and the internal oil of the capacitor is full and independent of the outside world.

[0082] Step 5: Install the oil exhaust tooling

[0083] In order to compress the expander 120 to the height corresponding to the required temperature, it is necessary to perform oil priming. The connecting portion 40 is connected to the oil filling hole 11, and the spring piece 15 is pushed open by about 5mm to install the exhaust oil priming device.

[0084] Step 6: Exhaust

[0085] Connect the pipe 71 to the second control valve 94 and continue to place the pipe 71 in the second container 110, open the first control valve 92 and the second control valve 94, and turn on the power device 72. When liquid medium flows out from the right end of the exhaust branch line 60, it means that the exhaust is completed. Close the first control valve 92 and the power device 72 in turn, and read and record the amount of liquid medium in the second container 110 at this time.

[0086] Step 7: Top oiling

[0087] Turn on the power device 72, inject a certain amount of liquid insulating medium into the capacitor and observe the value of the pressure gauge 80. When the value displayed on the pressure gauge 80 is 0.04 MPa, read and record the amount of liquid medium in the second container 110 at this time.

[0088] Step 8: Remove the oil venting tool

[0089] At this time, the spring piece 15 returns to its original state and is tightly attached to the upper cover 10 to close the oil filling hole 11 .

[0090] Step 9: Install the sealing cover and solder it with a soldering iron

[0091] From the above description, it can be seen that the above embodiments of the utility model achieve the following technical effects:

[0092] The capacitor oil filling system includes an upper cover, an exhaust oil-top device and a power assembly. The upper cover is used to cover the shell of the capacitor. The upper cover has an oil filling hole and a spring installation hole. The upper cover includes a spring. The spring can be movably arranged at the spring installation hole to block or open the spring installation hole. The exhaust oil-top device includes a main line, a connecting part, an oil-top branch line and an exhaust branch line. The connecting part is arranged at the end of the main line to be connected with the oil filling hole. The oil-top branch line and the exhaust branch line are both connected with the main line. The height of the exhaust branch line is higher than the height of the oil-top branch line. The exhaust oil-top device has an exhaust state and an oil-top state. The power assembly is used to transport the oil in the shell to the oil barrel or to transport the liquid insulating medium to the shell. The power assembly includes a pipeline and a power device arranged on the pipeline. In this way, the exhaust oil-top device has an exhaust state and an oil-top state. In order to compress the expander to the height corresponding to the required temperature, it is necessary to implement oil-top exhaust. During the installation of the exhaust oil jacking device, the connection part is connected to the oil filling hole, one end of the pipeline is connected to the liquid insulating medium, and the other end of the pipeline is connected to the oil jacking branch pipeline, so that the gas stored in the capacitor is discharged through the exhaust branch pipeline. At this time, the exhaust oil jacking device is in the exhaust state. After the exhaust is completed, the exhaust branch pipeline is closed to inject liquid insulating medium into the shell through the oil jacking branch pipeline, the main pipeline, the connection part and the oil filling hole in sequence. At this time, the exhaust oil jacking device is in the oil jacking state and the expander returns to the height at room temperature. The expander will realize its own function with the temperature change in the later stage, thereby solving the problem in the prior art that the expander has an error in the compensation amount of the insulating oil liquid and affects the normal operation of the capacitor.

[0093] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0094] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0095] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0096] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A capacitor oil filling system, characterized in that: include: An upper cover (10) is used to cover a housing (20) of a capacitor, the upper cover (10) having an oil filling hole (11) and a spring-loaded sheet mounting hole (14), the upper cover (10) comprising a spring (15), the spring (15) being movably arranged at the spring-loaded sheet mounting hole (14) to block or open the spring-loaded sheet mounting hole (14); An exhaust and oil-top device comprises a main pipeline (30), a connecting portion (40), an oil-top branch pipeline (50) and an exhaust branch pipeline (60); the connecting portion (40) is arranged at the end of the main pipeline (30) to be connected to the oil filling hole (11); the oil-top branch pipeline (50) and the exhaust branch pipeline (60) are both connected to the main pipeline (30); the height of the exhaust branch pipeline (60) is higher than the height of the oil-top branch pipeline (50); the exhaust and oil-top device has an exhaust state and an oil-top state; A power assembly (70) is used to transport oil in the housing (20) into an oil barrel or to transport a liquid insulating medium into the housing (20). The power assembly (70) comprises a pipeline (71) and a power device (72) arranged on the pipeline (71).

2. The capacitor oil filling system according to claim 1, characterized in that: When the exhaust and oil-top device is in the exhaust state, one end of the pipeline (71) is in communication with the liquid insulating medium, and the other end of the pipeline (71) is in communication with the oil-top branch pipeline (50), so that the gas stored in the capacitor is discharged through the exhaust branch pipeline (60); when the exhaust and oil-top device is in the oil-top state, the exhaust branch pipeline (60) is closed, so that the liquid insulating medium is injected into the housing (20) in sequence through the oil-top branch pipeline (50), the main pipeline (30), the connecting portion (40), and the oil injection hole (11).

3. The capacitor oil filling system according to claim 1, characterized in that: The exhaust oil lifting device also includes: a pressure gauge (80) disposed on an end of the main pipe (30) away from the connecting portion (40); a control module connected to both the pressure gauge (80) and the power device (72); Wherein, when the exhaust oil-top device is in the oil-top state and the pressure value of the pressure gauge (80) reaches a preset pressure value, the power device (72) is controlled to stop running through the control module.

4. The capacitor oil filling system according to claim 1, characterized in that: The exhaust top oil device further comprises a first three-way structure (91) and a first control valve (92), wherein the two straight pipes of the first three-way structure (91) are in communication with the main pipeline (30), and the side pipe of the first three-way structure (91) forms the top oil branch pipeline (50) or is in communication with the top oil branch pipeline (50); the first control valve (92) is arranged on the side pipe or the top oil branch pipeline (50); and / or, the exhaust top oil device further comprises a second three-way structure (93) and a second control valve (94), wherein the two straight pipes of the second three-way structure (93) are in communication with the main pipeline (30), and the side pipe of the second three-way structure (93) forms the exhaust branch pipeline (60) or is in communication with the exhaust branch pipeline (60); the second control valve (94) is arranged on the side pipe or the exhaust branch pipeline (60).

5. The capacitor oil filling system according to claim 1, characterized in that: The upper cover (10) comprises: The cover body (13) has the oil injection hole (11) and the expander connection hole (12), and the spring piece mounting hole (14) and the oil injection hole (11) are arranged at intervals on the cover body (13); A fastener, for connecting the spring sheet (15) and the cover body (13) by inserting the fastener through the spring sheet mounting hole (14) and the spring sheet (15); When the connecting portion (40) extends into the oil filling hole (11) and communicates with the oil filling hole (11), at least a portion of the spring sheet (15) is pushed open by the connecting portion (40) to separate from the spring sheet mounting hole (14).

6. The capacitor oil filling system according to claim 1, characterized in that: The oil filling hole (11) comprises: a first hole section (111), wherein a first end of the first hole section (111) passes through a first surface of the upper cover (10); a second hole segment (112), wherein a first end of the second hole segment (112) is connected to a second end of the first hole segment (111), and a second end of the second hole segment (112) passes through a second surface of the upper cover (10); The diameter of the first hole section (111) is larger than the diameter of the second hole section (112), so that a step surface is formed when the two are connected; and the length of the connecting portion (40) is larger than the length of the oil injection hole (11).

7. The capacitor oil filling system according to claim 6, characterized in that: The connecting portion (40) comprises: A first connecting tube (41), used for extending into the first hole section (111) and matching with the first hole section (111); A second connecting tube (42) connected to the first connecting tube (41) and used to extend into the second hole section (112); The opening end of the second connecting tube (42) away from the first connecting tube (41) has a guide portion (421), and the guide portion (421) is located on the tube wall of the second connecting tube (42).

8. The capacitor oil filling system according to claim 7, characterized in that: The guide portion (421) is at least one of an arc-shaped notch, a tapered hole, a tapered surface and an inclined surface.

9. The capacitor oil filling system according to claim 1, characterized in that: The power device (72) is a gear pump.

10. The capacitor oil filling system according to claim 5, characterized in that: The expander connection hole (12) and / or the spring sheet mounting hole (14) are blind holes; or, the expander connection hole (12) and / or the spring sheet mounting hole (14) are threaded holes.

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