Oil-replaceable alternating current capacitor

Abstract

The utility model discloses an oil-replaceable AC capacitor, and the capacitor comprises a housing which is provided with an opening end and a bottom wall opposite to the opening end; the end cover covers the open end, a sealing cavity is defined between the shell and the end cover, the end cover is provided with a through oil inlet hole and a through oil outlet hole, a first oil guide pipe is arranged on the side, close to the sealing cavity, of the end cover, one end of the first oil guide pipe communicates with the oil inlet hole, the other end of the first oil guide pipe is close to the bottom wall, and the oil inlet hole is provided with a detachable first sealing piece; the oil outlet hole is provided with a detachable second sealing piece. According to the oil-replaceable alternating current capacitor provided by the invention, the aged insulating oil in the alternating current capacitor can be replaced, the service life of the alternating current capacitor is prolonged, the resources of the alternating current capacitor are saved, meanwhile, oil feeding and oil discharging are carried out synchronously, and the oil replacement efficiency of the alternating current capacitor is improved.

Description

Technical Field

[0001] This utility model generally relates to the field of capacitors, and more particularly to oil-replaceable AC capacitors. Background Technology

[0002] Existing oil-immersed AC capacitors consist of an aluminum shell, a core, and a cover. The core is located inside the aluminum shell, and the cover seals the open end of the aluminum shell. The core is filled with insulating oil. After prolonged use, AC capacitors experience insulating oil aging, and when the aging of the insulating oil is significant, the capacitor is considered to be in a failed state and needs to be replaced promptly. However, these failed AC capacitors are discarded or treated as scrap, resulting in a serious waste of AC capacitor resources. Utility Model Content

[0003] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide an oil-replaceable AC capacitor.

[0004] This application provides an oil-replaceable AC capacitor, comprising:

[0005] The outer casing has an open end and a bottom wall disposed opposite to the open end;

[0006] An end cap is provided at the open end, and a sealed cavity is formed between the outer shell and the end cap. The end cap is provided with a through oil inlet and an oil outlet. A first oil guide tube is provided on the side of the end cap near the sealed cavity. One end of the first oil guide tube is connected to the oil inlet and the other end is close to the bottom wall. The oil inlet is provided with a removable first seal and the oil outlet is provided with a removable second seal.

[0007] Furthermore, a second oil guide tube is provided inside the sealing cavity. One end of the second oil guide tube is connected to the second seal. The second oil guide tube is provided with an oil discharge hole, which is located close to the second seal. The second oil guide tube includes an elastic interference section, wherein when the second oil guide tube is separated from the oil outlet hole along with the second seal, the elastic interference section is squeezed and fitted with the hole wall of the oil outlet hole.

[0008] Furthermore, a stop is provided at the end of the second oil guide tube away from the second seal, and the stop is used for the end cap to stop the fit.

[0009] Furthermore, the stop component is a stop ring, which surrounds the end of the second oil guide tube, and the hardness of the stop ring is greater than that of the second oil guide tube.

[0010] Furthermore, one end of the elastic interference section extends to the end of the second oil guide tube away from the second seal.

[0011] Furthermore, the first sealing element includes a first screw and a first sealing ring, the first screw being screwed into the oil inlet and the first sealing ring being clamped between the head of the first screw and the end cap.

[0012] Furthermore, the second seal includes a second screw and a second sealing ring, the second screw being screwed into the oil outlet and the second sealing ring being clamped between the head of the second screw and the end cap.

[0013] The replaceable oil AC capacitor provided in this application has a through oil inlet and an oil outlet on the end cover. A first oil guide tube is provided on the side of the end cover near the sealing cavity. One end of the first oil guide tube is connected to the oil inlet and the other end is close to the bottom wall of the outer shell. The oil inlet is provided with a removable first seal and the oil outlet is provided with a removable second seal. New insulating oil can be discharged to the bottom of the sealing cavity through the first oil guide tube, and aged insulating oil is discharged through the oil outlet under the drive of the new insulating oil. This not only replaces the aged insulating oil in the AC capacitor, extending the service life of the AC capacitor and saving AC capacitor resources, but also makes oil inlet and outlet simultaneous, improving the oil changing efficiency of the AC capacitor. Attached Figure Description

[0014] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0015] Figure 1 A half-sectional schematic diagram of an AC capacitor provided in an embodiment of this application;

[0016] Figure 2 for Figure 1 Enlarged view of part A in the image;

[0017] Figure 3 for Figure 1 Enlarged view of part B in the image. Detailed Implementation

[0018] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the relevant utility model and not intended to limit the scope of the utility model. Furthermore, it should be noted that, for ease of description, only the parts relevant to the utility model are shown in the accompanying drawings.

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] Please refer to Figure 1-3This application provides an oil-replaceable AC capacitor, including a housing 100 and an end cap 200. The housing 100 has an open end and a bottom wall 110 opposite to the open end. The end cap 200 is sealed at the open end, forming a sealed cavity 101 between the housing 100 and the end cap 200. The core of the AC capacitor is located in the sealed cavity 101, and the sealed cavity 101 is filled with insulating oil. The end cap 200 has a through oil inlet 201 and an oil outlet 202. Specifically, the oil inlet 201 and the oil outlet 202 are provided through the end cap 200 along the thickness direction of the end cap 200, and both the oil inlet 201 and the oil outlet 202 communicate with the sealed cavity 101. The oil inlet 201 is equipped with a removable first seal 500, which can seal the oil inlet 201. The oil outlet 202 is equipped with a removable second seal 600, which can seal the oil outlet 202. The end cap 200 is provided with a first oil guide tube 300 on the side near the sealing cavity 101. One end of the first oil guide tube 300 is connected to the oil inlet 201 and the other end is close to the bottom wall 110. New insulating oil can be discharged to the bottom of the sealing cavity 101 through the oil inlet 201 and the first oil guide tube 300 in sequence, while the aged insulating oil is discharged through the oil outlet 202 under the drive of the new insulating oil. This not only replaces the aged insulating oil in the AC capacitor, extending the service life of the AC capacitor and saving AC capacitor resources, but also makes oil inlet and outlet simultaneous, improving the oil replacement efficiency of the AC capacitor.

[0021] Optionally, the oil inlet 201 is a threaded hole. The first sealing element 500 includes a first screw 510 and a first sealing ring 520. The first screw 510 is screwed into the oil inlet 201. The first sealing ring 520 is sleeved on the outer periphery of the screw portion of the first screw 510 and clamped between the head of the first screw 510 and the end cap 200, so that the sealing performance of the first sealing element 500 is better. Preferably, the end cap 200 has a first recess on the side away from the sealing cavity 101, the first sealing ring 520 is pressed into the first recess, and the outer periphery of the first screw 510 has an insulating adhesive layer.

[0022] Optionally, the oil outlet 202 is a threaded hole. The second sealing element 600 includes a second screw 610 and a second sealing ring 620. The second screw 610 is screwed into the oil outlet 202. The second sealing ring 620 is sleeved on the outer periphery of the screw portion of the second screw 610 and clamped between the head of the second screw 610 and the end cap 200, so that the sealing performance of the second sealing element 600 is better. Preferably, the end cap 200 has a second recess on the side away from the sealing cavity 101, the second sealing ring 620 is pressed into the second recess, and the outer periphery of the second screw 610 has an insulating adhesive layer.

[0023] Optionally, an installation ring 210 extends from the side of the end cap 200 near the sealing cavity 101, and the installation ring 210 is coaxially arranged with the oil inlet 201. One end of the first oil guide tube 300 is sleeved on the outer periphery of the installation ring 210 and the two are interference-fitted.

[0024] In some embodiments of this application, a second oil guide tube 400 is provided inside the sealing cavity 101. One end of the second oil guide tube 400 is connected to the second sealing member 600. The second oil guide tube 400 has an oil drain hole, which is located close to the second sealing member 600. The second oil guide tube 400 includes an elastic interference section 430, wherein when the second oil guide tube 400 disengages from the oil outlet hole 202 along with the second sealing member 600, the elastic interference section 430 is pressed against the hole wall of the oil outlet hole 202. Specifically, when the second seal 600 is removed from the oil outlet 202, it will drive the second oil guide tube 400 to move in the direction of disengaging from the sealing cavity 101. When the elastic interference section 430 passes through the oil outlet 202, it will be squeezed. At this time, the entire second oil guide tube 400 can maintain its current position by utilizing the friction between the elastic interference section 430 and the oil outlet 202. A certain degree of sealing is formed between the second oil guide tube 400 and the wall of the oil outlet 202 to prevent a large amount of aged insulating oil from seeping out through the gap between the two and covering the end cap 200. In addition, the aged insulating oil can be discharged to the outside through the drain hole to further prevent a large amount of aged insulating oil from accumulating on the end cap 200.

[0025] Optionally, the second oil guide tube 400 is an elastic tube, and the material can be, but is not limited to, aging-resistant polyvinyl chloride thermoplastic elastomers, etc.

[0026] Optionally, the end of the second oil guide tube 400 away from the second seal 600 is provided with a stop. The stop is used to stop the end cap 200 to prevent the second oil guide tube 400 from detaching from the capacitor during external pulling. Preferably, the stop is a stop ring 440, which surrounds the end of the second oil guide tube 400, and the hardness of the stop ring 440 is greater than that of the second oil guide tube 400. For example, the stop ring 440 is made of aluminum, and the outer periphery of the end of the second oil guide tube 400 away from the second seal 600 is provided with an extension 431, in which the stop ring 440 is embedded.

[0027] Optionally, one end of the elastic interference section 430 extends to the end of the second oil guide tube 400 away from the second seal 600, at which time the stop ring 440 is located on the outer periphery of the end of the elastic interference section 430.

[0028] Optionally, the second oil guide pipe 400 further includes a guide section 410 and a variable diameter section 420. The variable diameter section 420 is located between the guide section 410 and the elastic interference section 430, and both ends of the variable diameter section 420 are fixedly connected to the guide section 410 and the elastic interference section 430, respectively. The diameter of the guide section 410 is smaller than the diameter of the elastic interference section 430, and the diameter of the variable diameter section 420 decreases sequentially along the axial direction. The oil drain hole is located in the guide section 410. The screw portion of the second screw 610 is provided with a slot that extends axially, and the end of the guide section 410 away from the variable diameter section 420 is fixed in the slot.

[0029] It should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used above to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention; the directional terms "inner" and "outer" refer to the inside or outside relative to the outline of each component itself. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0030] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, rotated 90 degrees, or in other orientations, and the spatial relative descriptions used herein will be interpreted accordingly.

[0031] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in this application is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A replaceable oil AC capacitor, characterized in that, include: A housing having an open end and a bottom wall disposed opposite to the open end; An end cap is provided on the open end, and a sealed cavity is formed between the outer shell and the end cap. The end cap has a through oil inlet and an oil outlet. A first oil guide tube is provided on the side of the end cap near the sealed cavity. One end of the first oil guide tube is connected to the oil inlet and the other end is close to the bottom wall. The oil inlet is provided with a removable first seal and the oil outlet is provided with a removable second seal.

2. The oil-replaceable AC capacitor according to claim 1, characterized in that, The sealed cavity is provided with a second oil guide tube, one end of which is connected to the second seal. The second oil guide tube is provided with an oil discharge hole, which is located close to the second seal. The second oil guide tube includes an elastic interference section, wherein when the second oil guide tube is disengaged from the oil outlet hole along with the second seal, the elastic interference section is squeezed and fitted with the hole wall of the oil outlet hole.

3. The oil-replaceable AC capacitor according to claim 2, characterized in that, The second oil guide tube has a stop at one end away from the second seal, and the stop is used for the stop engagement of the end cap.

4. The oil-replaceable AC capacitor according to claim 3, characterized in that, The stop member is a stop ring, which surrounds the end of the second oil guide tube, and the hardness of the stop ring is greater than that of the second oil guide tube.

5. The oil-replaceable AC capacitor according to claim 3, characterized in that, One end of the elastic interference section extends to the end of the second oil guide tube away from the second seal.

6. The oil-replaceable AC capacitor according to claim 1, characterized in that, The first sealing element includes a first screw and a first sealing ring. The first screw is screwed into the oil inlet hole and the first sealing ring is clamped between the head of the first screw and the end cap.

7. The oil-replaceable AC capacitor according to claim 1, characterized in that, The second sealing element includes a second screw and a second sealing ring. The second screw is screwed into the oil outlet and the second sealing ring is clamped between the head of the second screw and the end cap.

Images