Ac filtering capacitor

Abstract

The utility model describes an alternating current filter capacitor, it includes: capacitor body, inside is equipped with first accommodating cavity, first accommodating cavity with outside thoroughness, temperature sensor, at least partial in first accommodating cavity. Thus, temperature sensor is located capacitor body's inside, can effectively monitor alternating current filter capacitor inside's heat condition, and can reduce the influence of external environment to temperature sensor, make temperature sensor to alternating current filter capacitor's temperature monitoring data more accurate and reliable, can provide accurate data reference for staff. In addition, temperature sensor can also be located in the central region of the capacitor core, so that the temperature of the highest temperature of the capacitor core can be monitored, ensuring that the measured temperature data is closer to the actual working temperature of the capacitor core, and better reflects the heating condition of the capacitor core.

Description

Technical Field

[0001] This utility model relates to the field of electrical facilities technology, and in particular to an AC filter capacitor. Background Technology

[0002] AC filter capacitors are passive devices used in power systems. They selectively absorb or reflect harmonics of specific frequencies, reducing interference to other electrical equipment and ensuring the stable operation of the power system.

[0003] AC filter capacitors are prone to overheating during use, leading to performance degradation and even potential damage. To monitor the overheating of AC filter capacitors, some capacitors have temperature test strips attached to their outer surface or temperature sensors installed. However, these monitoring methods are easily affected by the surrounding environment, which can result in inaccurate temperature data. Utility Model Content

[0004] In view of the above-mentioned existing situation, this application provides an AC filter capacitor that can improve the problem of low temperature monitoring accuracy.

[0005] This utility model provides an AC filter capacitor, which includes: a capacitor body with a first accommodating cavity inside, the first accommodating cavity communicating with the outside; and a temperature sensor, at least partially located inside the first accommodating cavity.

[0006] Optionally, the capacitor body includes: a housing; a capacitor core housed within the housing, the capacitor core having a cavity; a cover covering the housing, the cover having a through hole communicating with the first receiving cavity; and an explosion-proof block disposed on the side of the cover facing the capacitor core, the explosion-proof block including a receiving portion having the first receiving cavity, the receiving portion extending into the cavity.

[0007] Optionally, the temperature sensor is located in the middle of the capacitor core in the cross-section of the capacitor core; the cross-section is parallel to the cover.

[0008] Optionally, the capacitor body further includes a limiting member, a first terminal and a second terminal arranged at intervals; the limiting member is located on the side of the cover away from the capacitor core, the first terminal and the second terminal are arranged at intervals, and the first terminal and the second terminal both pass through the limiting member, the cover and the explosion-proof block, and the first terminal and the second terminal are connected to the capacitor core.

[0009] Optionally, the limiting member is provided with a second accommodating cavity, which communicates with the first accommodating cavity through the through hole; the temperature sensor is located in the first accommodating cavity and the second accommodating cavity, and the limiting member is provided with an opening communicating with the second accommodating cavity to expose the wiring port of the temperature sensor.

[0010] Optionally, in the extending direction of the receiving portion, the limiting member is provided with an insertion port for placing or removing the temperature sensor; the capacitor body further includes a sealing cap for covering the insertion port.

[0011] Optionally, the capacitor core includes a first capacitor core and a second capacitor core.

[0012] Optionally, the capacitor body includes a first copper strip, a second copper strip, and a third copper strip; the first copper strip is connected to the first capacitor core and the second capacitor core respectively, the second copper strip is connected to the first copper strip and the first terminal; and the third copper strip is connected to the second capacitor core and the second terminal respectively.

[0013] Optionally, the capacitor body further includes a mounting stud, which is located on the side of the housing opposite to the cover.

[0014] The AC filter capacitor of this utility model includes a capacitor body and a temperature sensor. The capacitor body has a first accommodating cavity that communicates with the outside. The temperature sensor is at least partially located within the first accommodating cavity. Therefore, the temperature sensor is located inside the capacitor body, enabling effective monitoring of the internal heating of the AC filter capacitor and reducing the influence of the external environment on the temperature sensor. This results in more accurate and reliable temperature monitoring data for the AC filter capacitor, providing accurate data references for operators. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0017] Figure 1 This is a schematic diagram showing the overall structure of the AC filter capacitor involved in this application.

[0018] Figure 2 This is an exploded view of the AC filter capacitor involved in this application.

[0019] Figure 3 This is a schematic diagram showing the overall structure of the limiting component in the AC filter capacitor involved in this application.

[0020] Figure 4 This is another schematic diagram showing the overall structure of the AC filter capacitor involved in this application.

[0021] Figure 5 This is a cross-sectional view showing the AC filter capacitor involved in this application.

[0022] Reference numerals: 100, Temperature sensor; 1, Housing; 2, Capacitor core; 21, First capacitor core; 22, Second capacitor core; 23, First copper strip; 24, Second copper strip; 25, Third copper strip; 26, Spindle; 3, Cover; 4, Explosion-proof block; 41, Receiving part; 5, Limiting element; 51, Opening; 52, Insertion port; 53, Sealing cover; 6, First terminal; 7, Second terminal; 8, Mounting stud; 9, First insulating element; 10, Second insulating element; 11, Third insulating element. Detailed Implementation

[0023] The preferred embodiments of this application will now be described in detail with reference to the accompanying drawings. In the following description, the same reference numerals are used for the same components, and repeated descriptions are omitted. Furthermore, the drawings are merely schematic diagrams, and the proportions of the components or their shapes may differ from actual dimensions. It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0024] It should also be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component present. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component present.

[0025] Reference Figure 1This application provides an AC filter capacitor, which includes a capacitor body and a temperature sensor 100. The capacitor body has a first accommodating cavity that communicates with the outside; the temperature sensor 100 is at least partially located within the first accommodating cavity. Therefore, the temperature sensor 100 is located inside the capacitor body, enabling effective monitoring of the internal heating of the AC filter capacitor and reducing the influence of the external environment on the temperature sensor 100. This results in more accurate and reliable temperature monitoring data from the temperature sensor 100, providing accurate data references for personnel.

[0026] Reference Figure 1 and Figure 2 In some embodiments, the capacitor body includes: a housing 1; a capacitor core 2 housed within the housing 1, and the capacitor core 2 having a cavity; a cover 3 covering the housing 1, and the cover 3 having a through hole communicating with the first receiving cavity; and an explosion-proof block 4 disposed on the side of the cover 3 facing the capacitor core 2, and the explosion-proof block 4 including a receiving portion 41 having a first receiving cavity, the receiving portion 41 extending into the cavity. Specifically, the capacitor core 2 typically has a spindle 26, which can be a hollow structure, so the cavity of the capacitor core 2 can be the hollow space inside the spindle 26. Thus, the temperature sensor 100 can extend into the capacitor core 2, thereby better detecting the core temperature of the capacitor core 2 and more accurately reflecting the heating status of the capacitor core 2. The housing 1 and the cover 3 are made of aluminum, and the explosion-proof block 4 is made of plastic.

[0027] In some embodiments, the temperature sensor 100 is located at the center of the capacitor core 2 in its cross-section; the cross-section is parallel to the cover 3. Specifically, the outer contour of the capacitor core 2 can be considered as a cylindrical structure, so the cross-section of the capacitor core 2 can be circular, and the temperature sensor 100 can be located in the central region of this circle. Thus, the temperature sensor 100 can be located in the central region of the capacitor core 2, thereby enabling the monitoring of the temperature of the region with the highest temperature in the capacitor core 2, ensuring that the measured temperature data is closer to the actual operating temperature of the capacitor core 2, and better reflecting the heating status of the capacitor core 2.

[0028] Reference Figures 2 to 5In some embodiments, the capacitor body further includes a limiting member 5, a first terminal 6, and a second terminal 7 spaced apart. The limiting member 5 is located on the side of the cover 3 away from the capacitor core 2. The first terminal 6 and the second terminal 7 are spaced apart and both penetrate the limiting member 5, the cover 3, and the explosion-proof block 4. The first terminal 6 and the second terminal 7 are connected to the capacitor core 2. Thus, the limiting member 5 can limit the first terminal 6 and the second terminal 7, allowing a gap between them. Specifically, the capacitor also includes an adapter plate (not shown in the figure) and a copper strip. The adapter plate can be located on the side of the explosion-proof block 4 away from the cover 3. The first terminal 6 is connected to an adapter plate and connected to the capacitor core 2 via the copper strip; the second terminal 7 is connected to an adapter plate and connected to the capacitor core 2 via the copper strip.

[0029] Reference Figure 3 In some embodiments, the limiting member 5 has a second accommodating cavity, which communicates with the first accommodating cavity through a through hole. The temperature sensor 100 is located within both the first and second accommodating cavities, and the limiting member 5 has an opening 51 communicating with the second accommodating cavity to expose the wiring port of the temperature sensor 100. Thus, the temperature sensor 100 can be connected to a connecting wire through the opening 51, and connected to external monitoring equipment via the connecting wire. Specifically, personnel can also use external detection equipment to monitor the internal temperature of the capacitor body in real time, detect abnormal heating of the capacitor core 2 in advance, and take measures to reduce losses.

[0030] Reference Figure 3 In some embodiments, the limiting member 5 is provided with an insertion port 52 in the extending direction of the accommodating portion 41. The insertion port 52 is used for placing and removing the temperature sensor 100. The capacitor body also includes a sealing cover 53, which is used to close the insertion port 52. Thus, the placement port 52 facilitates the installation of the temperature sensor 100. Specifically, during installation, the temperature sensor 100 is placed into the first accommodating cavity and the second accommodating cavity through the insertion port 52, and then the sealing cover 53 is closed. When the temperature sensor 100 needs to be replaced, the sealing cover 53 can also be opened to facilitate the removal of the temperature sensor 100.

[0031] Reference Figure 2 and Figure 5 In some embodiments, the capacitor core 2 includes a first capacitor core 21 and a second capacitor core 22. Therefore, the AC filter capacitor can include two capacitor cores 2, thereby increasing the capacitance and enhancing the filtering effect.

[0032] Reference Figure 2 and Figure 5In some embodiments, the capacitor body includes a first copper strip 23, a second copper strip 24, and a third copper strip 25; the first copper strip 23 is connected to the first capacitor core 21 and the second capacitor core 22 respectively, the second copper strip 24 is connected to the first copper strip 23 and the first terminal 6; and the third copper strip 25 is connected to the second capacitor core 22 and the second terminal 7 respectively.

[0033] In some embodiments, the capacitor body further includes a mounting stud 8, which is located on the side of the housing 1 opposite to the cover 3. This mounting stud 8 facilitates the threaded connection of the AC filter capacitor to the screw holes of external devices. In some examples, the AC filter capacitor can be used in photovoltaic inverters, where it can be directly installed at the output terminal of the inverter. This directly filters out harmonics and noise from the inverter output, thus improving the overall system efficiency.

[0034] Reference Figure 2 In some examples, the capacitor body further includes a first insulating member 9, a second insulating member 10, and a third insulating member 11. The first insulating member 9 is disposed between the explosion-proof block 4 and the capacitor core 2; the second insulating member 10 is disposed between the side wall of the capacitor core 2 and the shell 1, or between the copper strip and the shell 1; and the third insulating member 11 is disposed between the bottom of the capacitor core 2 and the shell 1. The second insulating member 10 may be barley paper, surrounding the capacitor core 2.

[0035] In summary, in the AC filter capacitor of this application, the temperature sensor 100 is located inside the capacitor body, which can effectively monitor the heating inside the AC filter capacitor and reduce the influence of the external environment on the temperature sensor 100, making the temperature monitoring data of the AC filter capacitor by the temperature sensor 100 more accurate and reliable, thereby providing accurate data reference for the staff.

[0036] In the description of this application, 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 as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0037] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0038] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0039] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

[0040] Although the present invention has been specifically described above in conjunction with the accompanying drawings and embodiments, it is to be understood that the above description does not limit the present invention in any way. Those skilled in the art can make modifications and variations to the present invention as needed without departing from the essential spirit and scope of the present invention, and all such modifications and variations fall within the scope of the present invention.

Claims

1. An AC filter capacitor, characterized in that, include: The capacitor body has a first receiving cavity inside, and the first receiving cavity communicates with the outside; A temperature sensor is at least partially located within the first accommodating cavity; The capacitor body includes: case; A capacitor core is housed within the housing, and the capacitor core has a cavity; A cover body, which is disposed on the housing, and the cover body is provided with a through hole communicating with the first accommodating cavity; An explosion-proof block is provided on the side of the cover facing the capacitor core, and the explosion-proof block includes a receiving portion, the receiving portion having a first receiving cavity, and the receiving portion extending into the cavity.

2. The AC filter capacitor according to claim 1, characterized in that, On the cross-section of the capacitor core, the temperature sensor is located in the middle of the capacitor core; The cross-section is parallel to the cover.

3. The AC filter capacitor according to claim 1, characterized in that, The capacitor body also includes a limiting member, a first terminal and a second terminal arranged at intervals; The limiting member is located on the side of the cover away from the capacitor core. The first terminal and the second terminal are spaced apart and both the first terminal and the second terminal pass through the limiting member, the cover and the explosion-proof block. The first terminal and the second terminal are connected to the capacitor core.

4. The AC filter capacitor according to claim 3, characterized in that, The limiting member is provided with a second receiving cavity, which communicates with the first receiving cavity through the through hole; The temperature sensor is located in the first accommodating cavity and the second accommodating cavity, and the limiting member has an opening communicating with the second accommodating cavity to expose the wiring port of the temperature sensor.

5. The AC filter capacitor according to claim 3, characterized in that, In the extending direction of the accommodating portion, the limiting member is provided with an inlet, which is used for picking up and placing the temperature sensor; The capacitor body also includes a sealing cap for covering the inlet.

6. The AC filter capacitor according to claim 3, characterized in that, The capacitor core includes a first capacitor core and a second capacitor core.

7. The AC filter capacitor according to claim 6, characterized in that, The capacitor body includes a first copper strip, a second copper strip, and a third copper strip; The first copper strip is connected to the first capacitor core and the second capacitor core respectively, and the second copper strip is connected to the first copper strip and the first terminal. The third copper strip is connected to the second capacitor core and the second terminal block, respectively.

8. The AC filter capacitor according to claim 1, characterized in that, The capacitor body also includes mounting studs, which are located on the side of the housing opposite to the cover.

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