Capacitor oil injection assembly structure

Abstract

The utility model discloses a capacitor oil injection subassembly structure can guarantee after being filled with insulating oil in capacitor inside, can utilize oil suction machine and take away most of the redundant insulating oil reasonably, thereby can reduce waste, can also avoid the condition that a large amount of insulating oil appears and overflows in capacitor shell top. The main structure of the application includes the oil injection hole of being located on capacitor shell and the oil injection pipe spare of being located on the oil injection hole, the oil injection hole is located on the top board of capacitor shell, and the oil injection pipe spare includes the oil inlet pipe of sealed connection between the oil injection hole, and the oil inlet pipe upper end is the oil inlet end for with the butt joint of external oil supply hose, and the oil inlet pipe lower end communicates with capacitor shell inside, the oil injection pipe spare still includes the oil suction pipe, and the oil suction pipe is arranged obliquely, and the oil suction pipe upper end is the oil suction end for with the butt joint of external oil suction hose, and the oil suction pipe lower end is connected with the side mouth of the butt joint and intercommunication, and the oil suction pipe is equipped with the on-off valve.

Description

Technical Field

[0001] This utility model belongs to the field of electrical and capacitor technology, and in particular relates to a capacitor oil filling assembly structure. Background Technology

[0002] Capacitors play a crucial role in circuits for tuning, bypassing, coupling, and filtering. They are also a common electrical component in industrial production. Some capacitors, such as high-voltage capacitors, require insulating oil because they need better insulation performance under high voltage, and their larger size and higher heat dissipation requirements also contribute to the problem. The usual method is to fill the capacitor casing with insulating oil. Once the oil is full, the relevant tubing used for oil filling can be removed, and the oil filling hole can be sealed with a plug to complete the oil filling process. However, traditional tubing used for oil filling can easily cause significant oil overflow when separated from the capacitor casing, making subsequent cleaning quite difficult. Utility Model Content

[0003] This utility model provides a capacitor oil filling assembly structure that ensures that after the capacitor is filled with insulating oil, most of the excess insulating oil can be removed by an oil suction machine, thereby reducing waste and preventing a large amount of insulating oil from overflowing at the top of the capacitor shell.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A capacitor oil filling assembly structure includes an oil filling hole provided on the capacitor housing and an oil filling pipe provided on the oil filling hole;

[0006] The oil filling hole is located on the top plate of the capacitor housing. The oil filling fitting includes an oil inlet pipe that is sealed to the oil filling hole. The upper end of the oil inlet pipe is an oil inlet end for connecting with the external oil supply hose, and the lower end of the oil inlet pipe is connected to the inside of the capacitor housing.

[0007] The oil injection fitting also includes an oil suction pipe, which is arranged at an angle. The upper end of the oil suction pipe is a suction end for connecting with an external oil suction hose. A side opening is provided on the side wall of the oil inlet pipe. The lower end of the oil suction pipe is connected to and connected with the side opening. An on / off valve is provided on the oil suction pipe.

[0008] Preferably, the oil inlet pipe is equipped with an internal oil pipe with a maximum outer diameter of N and an inner diameter of M, where N is less than M. The lower end of the internal oil pipe is an internal oil suction end, and the upper end of the internal oil pipe is connected to and connected to the side opening. The internal oil pipe is fixed to the oil inlet pipe, and the distance between the internal oil suction end and the upper end of the oil injection hole is L, where L is less than 0.2 cm.

[0009] Preferably, the top plate of the capacitor housing is provided with a downwardly recessed partial groove, the upper end of the oil injection hole opens at the bottom of the partial groove, and the internal oil suction end is located inside the partial groove.

[0010] Preferably, the lower part of the oil inlet pipe is provided with an external thread, and the oil injection hole is provided with an internal thread. The external thread and the internal thread are matched. When the oil inlet pipe and the oil injection hole are threadedly connected, the oil inlet pipe and the oil injection hole are sealed together, and the lowest point of the oil inlet pipe is above the lowest point of the oil injection hole.

[0011] Preferably, the built-in oil pipe includes an upper inner oil pipe and a lower flared pipe. The lower end of the upper inner oil pipe is connected to the upper end of the lower flared pipe. The axis of the lower flared pipe is vertical. The inner diameter of the lower flared pipe gradually increases from top to bottom, and the outer diameter of the lower flared pipe gradually increases from top to bottom.

[0012] Preferably, the oil inlet pipe is equipped with an oil inlet check valve. The oil inlet check valve can be used to reach the lower end of the oil inlet pipe from the oil inlet end through the oil inlet end. The upper end of the oil inlet pipe, the oil inlet check valve, the side port and the lower end of the oil inlet pipe are arranged in order from top to bottom. In the oil inlet pipe, an overflow prevention space is formed between the oil inlet check valve and the upper end of the oil inlet pipe.

[0013] The beneficial effects of this utility model are: it can ensure that after the capacitor is filled with insulating oil, most of the excess insulating oil can be removed by an oil suction machine, thereby reducing waste and preventing a large amount of insulating oil from overflowing at the top of the capacitor shell; when the oil suction machine is suctioning oil, it will not suck up the insulating oil inside the capacitor shell, thus ensuring that the capacitor shell is full of oil and preventing the insulating oil from overflowing at the top of the capacitor shell; during the insulating oil filling process, it can ensure smooth venting, thereby ensuring the oil filling efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0016] Figure 3 This is a partial structural schematic diagram of the present invention;

[0017] Figure 4 This is a schematic diagram of the structure of a partial sinkhole in this utility model.

[0018] Reference numerals in the attached drawings: 1. Capacitor housing, 1.1. Oil inlet hole, 1.1a. Internal thread, 1.2. Partial settling groove, 101. Oil inlet pipe, 2. Oil inlet end, 2a. External thread, 2b. Side opening, 2.1. Oil suction pipe, 3. Oil suction end, 3a. On / off valve, 301. Internal oil pipe, 4. Internal oil suction end, 4a. Upper internal oil pipe, 401. Lower flared pipe, 402. Capacitor electrode, 5. Detailed Implementation

[0019] 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0020] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown,

[0021] A capacitor oil filling assembly structure includes an oil filling hole 1.1 provided on the capacitor housing 1 and an oil filling pipe provided on the oil filling hole 1.1;

[0022] The oil filling hole 1.1 is located on the top plate 101 of the capacitor housing 1. The oil filling pipe includes an oil inlet pipe 2 that is sealed and connected to the oil filling hole 1.1. The upper end of the oil inlet pipe 2 is an oil inlet end 2a for connecting with the external oil supply hose, and the lower end of the oil inlet pipe 2 is connected to the inside of the capacitor housing 1.

[0023] The oil injection fitting also includes an oil suction pipe 3, which is arranged at an angle. The upper end of the oil suction pipe 3 is connected to an oil suction end 3a for connecting with an external oil suction hose. The side wall of the oil inlet pipe 2 is provided with a side opening 2.1. The lower end of the oil suction pipe 3 is connected to and communicates with the side opening 2.1. An on / off valve 301 is provided on the oil suction pipe 3.

[0024] When it is necessary to fill the inside of the capacitor housing 1 with insulating oil, the oil filling fitting is installed on the oil filling hole 1.1. The oil filling fitting includes an oil inlet pipe 2 that is sealed to the oil filling hole 1.1. The outlet of the oil supply funnel (existing technology, specific style is not limited, as long as it has the function of a funnel) is connected to the upper end of the oil inlet pipe 2 through an external oil supply hose (usually a transparent soft rubber tube). The oil suction machine is connected to the upper end of the oil suction pipe 3 through an external oil suction hose (usually a transparent soft rubber tube). Insulating oil is added from the oil supply funnel. Under the action of gravity, the insulating oil enters the inside of the capacitor housing 1 through the external oil supply hose, the upper end of the oil inlet pipe 2, and the lower end of the oil inlet pipe 2.

[0025] In early oil filling methods, the oil suction pipe 3 was absent; only the oil inlet pipe 2 was present. Once the capacitor casing 1 was filled with insulating oil, the oil inlet pipe 2 was directly removed, and the oil filling hole 1.1 was sealed with a plug, thus completing the oil filling process. However, this method made precise control of the oil volume, so a surplus was usually ensured; that is, insulating oil was typically also present in the oil inlet pipe 2. When the oil inlet pipe 2 was removed, a large amount of insulating oil would overflow onto the top plate 101 of the capacitor casing 1, resulting in a heavy subsequent cleaning burden.

[0026] In this design, after the insulating oil fills the inside of the capacitor housing 1 (there will also be some insulating oil in the oil inlet pipe 2), the oil suction machine is turned on. The oil suction machine sucks out the oil through the external oil suction hose, oil suction pipe 3, side port 2.1, and oil inlet pipe 2, removing the insulating oil from the oil inlet pipe 2. Therefore, when the oil inlet pipe 2 is removed, there will be almost no overflow of insulating oil on the top plate 101 of the capacitor housing 1. Note that before removing the oil inlet pipe 2 (oil filling fitting), the external oil supply hose and the oil filling fitting should be separated. The oil filling fitting is a reusable accessory.

[0027] The function of the on / off valve 301 is as follows: In production, to improve integration and efficiency, a large oil supply funnel is often used to supply oil to multiple capacitor housings 1 simultaneously (the oil inlet pipe 2 of each capacitor is connected to the outlet of the oil supply funnel via an external oil supply hose, and the oil supply funnel can have multiple outlets). When one capacitor housing 1 is full, other capacitor housings 1 may not be full yet. If the insulating oil continues to flow to the oil filling pipe corresponding to the full capacitor housing 1, the insulating oil will flow outward along the oil suction pipe 3 of that oil filling pipe (flowing to the external oil suction hose or even the oil suction machine), which obviously reduces the overall oil filling efficiency. Therefore, when one capacitor housing 1 is full, the on / off valve 301 on its oil filling pipe can be closed.

[0028] like Figure 3 As shown, the oil inlet pipe 2 is provided with an internal oil pipe 4. The maximum outer diameter of the internal oil pipe 4 is N, and the inner diameter of the oil inlet pipe 2 is M. N is less than M. The lower end of the internal oil pipe 4 is an internal oil suction end 4a. The upper end of the internal oil pipe 4 is connected to and connected to the side port 2.1. The internal oil pipe 4 is fixed to the oil inlet pipe 2. The distance between the internal oil suction end 4a and the upper end of the oil injection hole 1.1 is L, and L is less than 0.2cm.

[0029] As mentioned earlier, after the insulating oil fills the inside of the capacitor casing 1, the oil suction machine is turned on. The oil suction machine sucks out the oil through the external oil suction hose, oil suction pipe 3, side port 2.1, and oil inlet pipe 2, removing the insulating oil from the oil inlet pipe 2. This prevents a large amount of insulating oil from overflowing onto the top plate 101 of the capacitor casing 1 when the oil inlet pipe 2 is removed. However, the amount of oil suction is not easy to control, and it is easy to slightly "over-suction", resulting in a slightly insufficient amount of insulating oil inside the capacitor casing 1. To solve the above problem, an internal oil pipe 4 is installed. The distance between the lower end of the internal oil pipe 4 and the upper end of the oil filling hole 1.1 is very small (L is less than 0.2cm). In this way, when absorbing oil, the oil suction machine uses the external oil suction hose, the oil suction pipe 3, and the internal oil pipe 4 to absorb oil. When the level of insulating oil is lower than the lower end of the internal oil pipe 4, it can no longer "absorb oil". This avoids the aforementioned situation of slightly "over-absorbing oil" and ensures that the insulating oil inside the capacitor shell 1 is full. Moreover, since the distance between the lower end of the internal oil pipe 4 and the upper end of the oil filling hole 1.1 is very small, when the internal oil pipe 2 is removed, only a small amount of insulating oil may overflow, making cleaning relatively convenient.

[0030] like Figure 4 As shown, the top plate 101 of the capacitor housing 1 is provided with a downwardly recessed partial sink 1.2, the upper end of the oil injection hole 1.1 opens into the bottom of the partial sink 1.2, and the internal oil suction end 4a is located inside the partial sink 1.2.

[0031] As mentioned earlier, the distance between the lower end of the built-in oil pipe 4 and the upper end of the oil inlet 1.1 is very small (L less than 0.2cm). Therefore, theoretically, after oil suction, there will still be about 0.2cm of insulating oil remaining in the oil inlet pipe 2. When the oil inlet pipe 2 is removed, this small amount of insulating oil may still overflow onto the top plate 101 of the capacitor housing 1. In this solution, a partial sink 1.2 is further designed. In this way, when the oil suction machine sucks up the oil and the oil inlet pipe 2 is removed, there will be a small amount of insulating oil in the partial sink 1.2 (the residual insulating oil in the oil inlet pipe 2 will remain in the partial sink 1.2 and will not overflow). The insulating oil in the partial sink 1.2 can be directly absorbed with oil-absorbing paper, and then the oil inlet 1.1 can be directly sealed with a plug. The operation is simpler and there will be no oil overflow.

[0032] like Figure 3 , Figure 4 As shown, the lower part of the oil inlet pipe 2 is provided with an external thread 2b, and the oil injection hole 1.1 is provided with an internal thread 1.1a. The external thread 2b matches the internal thread 1.1a. When the oil inlet pipe 2 and the oil injection hole 1.1 are threadedly engaged, the oil inlet pipe 2 and the oil injection hole 1.1 are sealed together, and the lowest point of the oil inlet pipe 2 is above the lowest point of the oil injection hole 1.1.

[0033] The connection and sealing are achieved using a threaded fit, and the installation and removal of the oil filling pipe fitting are also very simple. When installing the oil filling pipe fitting, simply screw the external thread 2b at the bottom of the oil inlet pipe 2 into the oil filling hole 1.1. When removing the oil filling pipe fitting, simply rotate it to separate it from the oil filling hole 1.1. It should be noted that the top plate 101 of the capacitor housing 1 has multiple capacitor electrodes 5. Therefore, when designing and manufacturing the oil filling pipe fitting, the minimum height of the oil suction pipe 3 should be appropriate to accommodate the capacitor electrodes 5, so as to avoid interference between the oil suction pipe 3 and the capacitor electrodes 5 during the rotation of the oil filling pipe fitting.

[0034] like Figure 3 As shown, the built-in oil pipe 4 includes an upper inner oil pipe 401 and a lower flared pipe 402. The lower end of the upper inner oil pipe 401 is connected to the upper end of the lower flared pipe 402. The axis of the lower flared pipe 402 is vertical. The inner diameter of the lower flared pipe 402 gradually increases from top to bottom, and the outer diameter of the lower flared pipe 402 gradually increases from top to bottom.

[0035] When filling the capacitor casing 1 with insulating oil, the air inside the casing 1 can be discharged through the built-in oil pipe 4, the oil suction pipe 3, and the oil suction machine (the oil suction machine is not sealed; air can pass through smoothly when the oil suction machine is not working). If, during the downward flow of the insulating oil in the oil inlet pipe 2, the lateral flow rate of the insulating oil at the lower end of the built-in oil pipe 4 is relatively large, it is easy for the insulating oil to seal a large portion of the lower end of the built-in oil pipe 4, which will significantly reduce the venting effect and the filling efficiency of the insulating oil. Therefore, by setting the lower part of the built-in oil pipe 4 as a flared pipe 402, it can be effectively ensured that the lower end of the built-in oil pipe 4 is not blocked by too much insulating oil, thereby ensuring the venting effect and a high filling efficiency of the insulating oil.

[0036] The oil inlet pipe 2 is equipped with an oil inlet check valve. The oil inlet check valve can be used to reach the lower end of the oil inlet pipe 2 from the oil inlet end 2a. The upper end of the oil inlet pipe 2, the oil inlet check valve, the side port 2.1 and the lower end of the oil inlet pipe 2 are arranged in order from top to bottom. In the oil inlet pipe 2, an overflow prevention space is formed between the oil inlet check valve and the upper end of the oil inlet pipe 2.

[0037] After the oil suction is completed, the residual insulating oil on the inner wall of the external oil supply hose may not have completely flowed down and may still reach the upper end of the oil inlet pipe 2. With the overflow prevention space, the insulating oil that reaches the upper end of the oil inlet pipe 2 will enter the overflow prevention space (if the oil volume is too small to open the oil inlet check valve). When the external oil supply hose is separated from the oil filling fitting, the residual insulating oil on the inner wall of the external oil supply hose will overflow to the outside of the oil inlet pipe 2 (the residual insulating oil has a place to go, that is, it has entered the overflow prevention space in advance). The existence of the oil inlet check valve ensures that if the capacitor shell 1 is overturned (for example, by being knocked over by the operator) after the insulating oil filling is completed and the external oil supply hose is separated from the oil filling fitting, the insulating oil inside the capacitor shell 1 will not leak or overflow.

[0038] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A capacitor oil filling assembly structure, comprising an oil filling hole (1.1) disposed on a capacitor housing (1) and an oil filling pipe disposed on the oil filling hole (1.1); characterized in that, The oil injection hole (1.1) is located on the top plate (101) of the capacitor housing (1). The oil injection fitting includes an oil inlet pipe (2) that is sealed to the oil injection hole (1.1). The upper end of the oil inlet pipe (2) is an oil inlet end (2a) for connecting with the external oil supply hose. The lower end of the oil inlet pipe (2) is connected to the inside of the capacitor housing (1). The oil injection pipe also includes an oil suction pipe (3), which is arranged at an angle. The upper end of the oil suction pipe (3) is an oil suction end (3a) for connecting with the external oil suction hose. The side wall of the oil inlet pipe (2) is provided with a side port (2.1). The lower end of the oil suction pipe (3) is connected to and communicates with the side port (2.1). The oil suction pipe (3) is provided with an on / off valve (301). The oil inlet pipe (2) is provided with an internal oil pipe (4). The maximum outer diameter of the internal oil pipe (4) is N, and the inner diameter of the oil inlet pipe (2) is M. N is less than M. The lower end of the internal oil pipe (4) is the internal oil suction end (4a). The upper end of the internal oil pipe (4) is connected to and communicates with the side port (2.1). The internal oil pipe (4) is fixed to the oil inlet pipe (2). The distance between the internal oil suction end (4a) and the upper end of the oil injection hole (1.1) is L. L is less than 0.2cm. The top plate (101) of the capacitor housing (1) is provided with a downwardly recessed partial groove (1.2), the upper end of the oil injection hole (1.1) opens into the bottom of the partial groove (1.2), and the internal oil suction end (4a) is located inside the partial groove (1.2); The lower part of the oil inlet pipe (2) is provided with an external thread (2b), and the oil injection hole (1.1) is provided with an internal thread (1.1a). The external thread (2b) matches the internal thread (1.1a). When the oil inlet pipe (2) and the oil injection hole (1.1) are threadedly engaged, the oil inlet pipe (2) and the oil injection hole (1.1) are sealed together, and the lowest point of the oil inlet pipe (2) is above the lowest point of the oil injection hole (1.1). The built-in oil pipe (4) includes an upper inner oil pipe (401) and a lower flared pipe (402). The lower end of the upper inner oil pipe (401) is connected to the upper end of the lower flared pipe (402). The axis of the lower flared pipe (402) is vertical. The inner diameter of the lower flared pipe (402) gradually increases from top to bottom, and the outer diameter of the lower flared pipe (402) gradually increases from top to bottom. The oil inlet pipe (2) is equipped with an oil inlet check valve. The oil inlet check valve can be used to reach the lower end of the oil inlet pipe (2) from the oil inlet end (2a) through the oil inlet check valve. The upper end of the oil inlet pipe (2), the oil inlet check valve, the side port (2.1) and the lower end of the oil inlet pipe (2) are arranged in order from top to bottom. In the oil inlet pipe (2), an overflow prevention space is formed between the oil inlet check valve and the upper end of the oil inlet pipe (2).

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