Noise reduction power capacitor and noise reduction core

Abstract

The utility model provides a noise reduction power capacitor and a noise reduction core, and belongs to the technical field of machinery manufacturing, the noise reduction power capacitor comprises a capacitor housing, the top and the bottom of the capacitor housing are respectively provided with a top sound-proof cover and a bottom sound-proof cover through sealing washers, and the top of the capacitor housing is provided with a wire outlet sleeve in a manner of penetrating through the top sound-proof cover. A noise reduction core is installed in the capacitor shell, and a plurality of lifting pieces are installed on the two sides of the capacitor shell respectively. According to the utility model, the noise problem caused by each harmonic current of the capacitor can be solved through a method of internal noise reduction, external noise reduction or combination of the internal noise reduction and the external noise reduction, and the internal noise reduction, the external noise reduction or the combination of the internal noise reduction and the external noise reduction can be independently used according to different frequencies and sizes of the harmonic current borne by the power capacitor. And the noise is reduced.

Description

Technical Field

[0001] This utility model relates to the field of mechanical manufacturing technology, specifically to a noise-reducing power capacitor and a noise-reducing core. Background Technology

[0002] With the development of the national power industry, especially in the last two decades, in order to meet the electricity demand of developed regions, the country has invested a lot of money in the construction of high-voltage direct current transmission projects. As an indispensable piece of equipment in the converter station of high-voltage direct current transmission projects, power capacitors serve two purposes: first, to provide the reactive power required by the converter; and second, to filter out harmonics generated during the AC-DC conversion.

[0003] During the AC-DC and DC-AC conversion process, the current in the converter station equipment contains a large number of harmonic components. As equipment in the converter station, the power capacitor must withstand the current and voltage of the system. Traditional power capacitors used in converter stations will generate noise levels that exceed the national standards.

[0004] To reduce the noise of power capacitors during use in converter stations, capacitor manufacturers have conducted extensive research, resulting in various noise reduction methods. Each type of capacitor in a converter station carries different harmonic currents and generates different noise levels. Using noise reduction components inside the capacitor can only solve the noise problem caused by low-frequency harmonics, and the improvement on the noise problem caused by high-frequency harmonics is not significant. Utility Model Content

[0005] The purpose of this invention is to provide a noise-reducing power capacitor and a noise-reducing core to overcome the problems existing in the prior art. This invention can solve the noise problem caused by the harmonic currents of the capacitor through internal noise reduction, external noise reduction, or a combination of internal and external noise reduction. At the same time, depending on the frequency and magnitude of the harmonic currents borne by the power capacitor, internal noise reduction, external noise reduction, or a combination of internal and external noise reduction methods can also be used individually. The number of internal noise-reducing elements and their placement in the core, as well as the cavity distance between the external soundproof cover and the shell, can all be adjusted according to the noise level, thereby achieving the purpose of noise reduction.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A noise-reducing core for a power capacitor includes a core body, with end insulating pads installed at the top and bottom of the core body, and lead-out connecting pieces installed on the end insulating pads; several capacitor noise-reducing units are installed inside the core body through inter-group insulating pads, several capacitor elements are installed inside the capacitor noise-reducing units, several internal noise-reducing bodies are connected in parallel between the several capacitor elements through intermediate connecting pieces, and several capacitor noise-reducing units are connected in series through intermediate connecting pieces;

[0008] Furthermore, the number of capacitor elements and internal noise reduction elements inside each capacitor noise reduction unit is 4 to 20, wherein the number of capacitor elements is greater than or equal to the number of internal noise reduction elements;

[0009] Furthermore, the length and width of the internal noise reduction element are the same as those of the capacitor element;

[0010] Furthermore, the internal noise reduction body includes a cover A, and a cover B is fixed to the inner side of the cover A.

[0011] A noise-reducing power capacitor, based on the aforementioned noise-reducing core of a power capacitor, includes a capacitor shell, a top soundproof cover and a bottom soundproof cover respectively installed on the top and bottom of the capacitor shell through sealing gaskets, and an outgoing sleeve installed through the top soundproof cover on the top of the capacitor shell; a noise-reducing core is installed inside the capacitor shell, and several hanging rods are installed on both sides of the capacitor shell.

[0012] Furthermore, the outgoing sleeve is connected to the lead-out connecting piece;

[0013] Furthermore, the top soundproof cover includes a first cover body, on which a plurality of cover rings are provided, and first support members are respectively installed on both sides of the first cover body;

[0014] Furthermore, the cover ring is fixed to the capacitor housing by a small sealing washer; the first cover body is fixed to the capacitor housing by a large sealing washer.

[0015] Furthermore, the bottom soundproof cover includes a second cover body, with second support members installed on the outer top sides of the second cover body and third support members installed on the inner bottom sides of the second cover body;

[0016] Furthermore, the second cover is fixed to the capacitor housing by a large sealing gasket.

[0017] The above technical solution has the following advantages or beneficial effects:

[0018] This invention provides a noise-reducing core for power capacitors. By installing internal noise-reducing elements inside the core body, the noise generated by the power capacitor when subjected to various harmonic currents can be effectively reduced. This not only improves the comfort of the user environment but also reduces the potential noise interference to the surrounding environment and personnel. The number of internal noise-reducing elements and their placement within the core can be adjusted according to the noise level, further optimizing the noise reduction effect and ensuring the best noise reduction performance under different operating conditions. Long-term exposure to noise from harmonic currents not only affects the product's lifespan but may also adversely impact the stability of the power system. This invention not only effectively reduces noise but also indirectly improves the overall performance and reliability of the power capacitor, extending its lifespan.

[0019] Furthermore, by combining capacitor elements and internal noise reduction devices in a certain number and connecting them using inter-group insulating pads, the core structure becomes more compact. Simultaneously, due to the presence of the internal noise reduction devices, the noise generated by the capacitor elements within each group can be effectively absorbed and reduced, thereby improving noise reduction efficiency. The use of inter-group insulating pads not only ensures electrical isolation within the capacitor but also prevents mutual interference between capacitor elements, ensuring the stability and reliability of the capacitor. The combination of 4 to 20 capacitor elements and noise reduction devices provides considerable flexibility; the number of capacitor elements and noise reduction devices in each capacitor noise reduction unit can be adjusted according to actual needs to meet capacitors with different capacities and noise reduction requirements.

[0020] Furthermore, since the size of the internal noise reduction element matches that of the capacitor element, they can fit together tightly, thereby minimizing the possibility of noise generated by the capacitor element escaping into the surrounding environment.

[0021] This invention also provides a noise-reducing power capacitor. By combining an internal noise-reducing core with an external soundproof cover, this power capacitor achieves multiple layers of noise blocking and absorption. The internal noise-reducing core effectively reduces the noise generated by the capacitor elements, while the external soundproof cover further isolates and reduces the propagation of noise, thereby significantly improving the overall noise reduction effect. Simultaneously, the noise reduction method of this invention is highly flexible. Depending on the frequency and magnitude of the harmonic current carried by the power capacitor, internal noise reduction, external noise reduction, or a combination of both can be used individually, allowing the noise reduction scheme to be optimized for specific capacitor operating conditions, achieving more precise and effective noise reduction. Sealing gaskets are used between the capacitor shell and the top and bottom soundproof covers to ensure the internal sealing performance of the capacitor. The addition of lifting rods makes the capacitor more stable during installation and transportation, reducing the risk of damage caused by vibration or impact, and improving the safety and reliability of the capacitor.

[0022] Furthermore, the connection between the outgoing bushing and the lead-out connector ensures the stability of the electrical connection between the internal and external circuits of the capacitor, reduces the risk of electrical faults caused by poor or loose connections, and improves the operational reliability of the capacitor.

[0023] Furthermore, the first cover, as the main body of the top soundproof cover, can be more securely installed on the top of the capacitor casing through the cover ring and the first support members on both sides.

[0024] Furthermore, the use of sealing gaskets makes it easier to fix the cover ring and the first cover to the capacitor housing.

[0025] Furthermore, the addition of the second and third support components significantly enhances the structural stability and support of the bottom soundproof cover. This not only helps to fix the bottom soundproof cover but also prevents it from shifting or being damaged due to vibration or impact during capacitor operation, thereby ensuring the stable operation of the capacitor.

[0026] Furthermore, the use of a large sealing gasket ensures a tight fit between the second enclosure and the capacitor casing, effectively preventing external impurities such as dust and moisture from entering the capacitor, which helps extend the capacitor's service life and performance stability. Attached Figure Description

[0027] Figure 1 This is a front view of a noise-reducing power capacitor according to the present invention.

[0028] Figure 2 This is a side view of a noise-reducing power capacitor according to the present invention.

[0029] Figure 3 This is a schematic diagram of the structure of a noise-reducing core for a power capacitor according to the present invention;

[0030] Figure 4 This is a schematic diagram of the installation of the internal noise reduction body of a power capacitor noise reduction core according to the present invention;

[0031] Figure 5 This is a front view of the internal noise reduction body of a power capacitor noise reduction core according to the present invention;

[0032] Figure 6 This is a top view of the soundproof cover of the noise-reducing power capacitor according to this utility model;

[0033] Figure 7 This is a cross-sectional view of the top soundproof cover of a noise-reducing power capacitor according to the present invention;

[0034] Figure 8 This is a front view of the bottom soundproof cover of a noise-reducing power capacitor according to this utility model;

[0035] Figure 9 This is a top view of the bottom soundproof cover of a noise-reducing power capacitor according to this utility model;

[0036] Figure 10 This is a top view of a small sealing gasket for a noise-reducing power capacitor according to this utility model;

[0037] Figure 11 This utility model Figure 10 A partial sectional view of BB;

[0038] Figure 12 This is a top view of the large sealing gasket of a noise-reducing power capacitor according to this utility model;

[0039] Figure 13 This utility model Figure 12 A partial sectional view of AA;

[0040] Figure 14 This utility model Figure 12 A partial sectional view of BB;

[0041] Figure 15 This utility model Figure 12 A partial sectional view of CC;

[0042] In the diagram, 1-outlet sleeve; 2-top soundproof cover; 2-1-first cover body; 2-2-cover ring; 2-3-first support member; 3-small sealing gasket; 4-large sealing gasket; 5-capacitor shell; 6-bottom soundproof cover; 6-1-second cover body; 6-2-second support member; 6-3-third support member; 7-noise reduction core; 7-1-lead-out connecting piece; 7-2-capacitor element; 7-3-inter-group insulating pad; 7-4-intermediate connecting piece; 7-5-end insulating pad; 7-6-internal noise reduction body; 7-7-core body; 7-8-cover A; 7-9-cover B; 7-10-capacitor noise reduction unit; 8-hanging rod. Detailed Implementation

[0043] The present invention will be further described in detail below with reference to specific embodiments. The description is for explanation and not limitation of the present invention.

[0044] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention 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 invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0045] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0046] Example 1:

[0047] like Figure 3 As shown, this utility model provides a noise-reducing core for a power capacitor, including a core body 7-7. End insulating pads 7-5 are respectively installed at the top and bottom of the core body 7-7, serving as clamps for the entire core and ensuring its shape stability. Lead-out connecting pieces 7-1 are installed on the end insulating pads 7-5. Several capacitor noise-reducing units 7-10 are connected and installed inside the core body 7-7 via inter-group insulating pads 7-3, which serve as insulation between the individual capacitor noise-reducing units 7-10. Several capacitor elements 7-2 are stacked and installed inside each capacitor noise-reducing unit 7-10. Several internal noise reduction elements 7-6 are connected in parallel between components 7-2 via intermediate connecting pieces 7-4. The thickness, number, and placement of the internal noise reduction elements 7-6 within the core vary depending on the magnitude of the noise current borne by each type of capacitor, thereby reducing the operating noise of the capacitor. Each capacitor noise reduction unit 7-10 contains 4 to 20 capacitor elements 7-2 and internal noise reduction elements 7-6, with the number of capacitor elements 7-2 being greater than or equal to the number of internal noise reduction elements 7-6. Several capacitor noise reduction units 7-10 are connected in series via intermediate connecting pieces 7-4 to ensure the product's voltage rating and capacitance.

[0048] like Figure 4 and Figure 5 As shown, the length and width of the internal noise reduction body 7-6 are the same as those of the capacitor element 7-2. The internal noise reduction body 7-6 includes a cover A, and a cover B is fixed to the inner side of the cover A.

[0049] Preferably, the lead-out connecting piece 7-1 and the intermediate connecting piece 7-4 installed on the insulating pad 7-5 at the top end of the core body 7-7 are 0.5 mm thick tin-plated copper strips;

[0050] Preferably, the lead-out connecting piece 7-1 installed on the insulating pad 7-5 at the bottom end of the core body 7-7 is a 0.5 mm thick copper strip;

[0051] Preferably, the lead-out connecting piece 7-1 installed on the bottom end insulating pad 7-5 of the core body 7-7 is longer than the lead-out connecting piece 7-1 installed on the top end insulating pad 7-5, so that it can be wrapped from the side to the top, so that the top and bottom end insulating pads 7-5 are electrically connected to the lead-out sleeve 1, and the two electrodes of the capacitor are led out.

[0052] Preferably, the capacitor element 7-2 is a rectangular capacitor made of polypropylene film and aluminum foil, which performs the task of energy storage, and its two ends are electrodes;

[0053] Preferably, the inter-group insulating pad 7-3 is an insulating paperboard with a thickness of 0.3 mm;

[0054] Preferably, the end insulating pads 7-5 are 4 mm thick insulating paperboard;

[0055] Preferably, the internal noise reduction body 7-6 is a rectangular cavity formed by welding and fixing 1.5 mm thick stainless steel plate 409 L cover A and cover B. The thickness of the steel plate and the welding strength must ensure that the entire capacitor product does not deform or leak during the vacuum treatment process.

[0056] Example 2:

[0057] like Figure 3 As shown, this utility model provides a noise-reducing core for a power capacitor, including a core body 7-7. End insulating pads 7-5 are installed at the top and bottom of the core body 7-7, serving as clamps for the entire core and ensuring its shape stability. Lead-out connecting pieces 7-1 are installed on the end insulating pads 7-5. Five capacitor noise-reducing units 7-10 are connected and installed inside the core body 7-7 via inter-group insulating pads 7-3. The inter-group insulating pads 7-3 serve as insulation between the individual capacitor noise-reducing units 7-10. Each capacitor noise-reducing unit 7-10 contains four capacitor elements 7-2 and four internal noise-reducing bodies 7-6. Two capacitor elements 7-2 and two internal noise-reducing bodies 7-6 are evenly stacked and interleaved. The capacitor elements 7-2 are connected in parallel to the internal noise-reducing bodies 7-6 via intermediate connecting pieces 7-4. The five capacitor noise-reducing units 7-10 are connected in series via intermediate connecting pieces 7-4 to ensure the product's voltage rating and capacity.

[0058] like Figure 4 and Figure 5 As shown, the length and width of the internal noise reduction body 7-6 are the same as those of the capacitor element 7-2. The internal noise reduction body 7-6 includes a cover A, and a cover B is fixed on the inner side of the cover A.

[0059] Example 3:

[0060] like Figure 3 As shown, this utility model provides a noise-reducing core for a power capacitor, including a core body 7-7. End insulating pads 7-5 are installed at the top and bottom of the core body 7-7, serving as clamps for the entire core and ensuring its shape stability. Lead-out connecting pieces 7-1 are installed on the end insulating pads 7-5. Six capacitor noise-reducing units 7-10 are connected and installed inside the core body 7-7 via inter-group insulating pads 7-3. The inter-group insulating pads 7-3 serve as insulation between the various capacitor noise-reducing units 7-10. Each capacitor noise-reducing unit 7-10 contains a total of 13 capacitor elements 7-2 and internal noise-reducing bodies 7-6. The capacitor elements 7-2 are connected in parallel to the internal noise-reducing bodies 7-6 via intermediate connecting pieces 7-4. The five capacitor noise-reducing units 7-10 are connected in series via intermediate connecting pieces 7-4 to ensure the product's voltage rating and capacity.

[0061] Preferably, each capacitor noise reduction unit 7-10 contains a total of 13 capacitor elements 7-2 and internal noise reduction bodies 7-6, specifically 9 capacitor elements 7-2 and 4 internal noise reduction bodies 7-6 arranged in an alternating and stacked manner: 2 capacitor elements 7-2, 1 internal noise reduction body 7-6, 2 capacitor elements 7-2, 1 internal noise reduction body 7-6, 2 capacitor elements 7-2, 1 internal noise reduction body 7-6, 2 capacitor elements 7-2, 1 internal noise reduction body 7-6, 1 capacitor element 7-2;

[0062] Preferably, each capacitor noise reduction unit 7-10 contains a total of 13 capacitor elements 7-2 and internal noise reduction bodies 7-6, specifically 9 capacitor elements 7-2 and 4 internal noise reduction bodies 7-6 arranged in an alternating and stacked manner: 4 capacitor elements 7-2, 2 internal noise reduction bodies 7-6, 4 capacitor elements 7-2, 2 internal noise reduction bodies 7-6, and 1 capacitor element 7-2;

[0063] Preferably, each capacitor noise reduction unit 7-10 contains a total of 13 capacitor elements 7-2 and internal noise reduction bodies 7-6, specifically 9 capacitor elements 7-2 and 4 internal noise reduction bodies 7-6 arranged in an alternating and stacked manner: 3 capacitor elements 7-2, 2 internal noise reduction bodies 7-6, 3 capacitor elements 7-2, 2 internal noise reduction bodies 7-6, and 3 capacitor elements 7-2.

[0064] Preferably, each capacitor noise reduction unit 7-10 contains a total of 13 capacitor elements 7-2 and internal noise reduction bodies 7-6, specifically 10 capacitor elements 7-2 and 3 internal noise reduction bodies 7-6 arranged in an alternating and stacked manner: 3 capacitor elements 7-2, 1 internal noise reduction body 7-6, 3 capacitor elements 7-2, 1 internal noise reduction body 7-6, 3 capacitor elements 7-2, 1 internal noise reduction body 7-6, and 1 capacitor element 7-2;

[0065] Preferably, each capacitor noise reduction unit 7-10 contains a total of 13 capacitor elements 7-2 and internal noise reduction bodies 7-6, specifically 10 capacitor elements 7-2 and 3 internal noise reduction bodies 7-6 arranged in an alternating and stacked manner: 3 capacitor elements 7-2, 1 internal noise reduction body 7-6; 4 capacitor elements 7-2, 1 internal noise reduction body 7-6; 3 capacitor elements 7-2, 1 internal noise reduction body 7-6.

[0066] like Figure 4 and Figure 5 As shown, the length and width of the internal noise reduction body 7-6 are the same as those of the capacitor element 7-2. The internal noise reduction body 7-6 includes a cover A, and a cover B is fixed on the inner side of the cover A.

[0067] Example 4:

[0068] like Figure 3 As shown, this utility model provides a noise-reducing core for a power capacitor, including a core body 7-7. End insulating pads 7-5 are installed at the top and bottom of the core body 7-7, serving as clamps for the entire core and ensuring its shape stability. Lead-out connecting pieces 7-1 are installed on the end insulating pads 7-5. Four capacitor noise-reducing units 7-10 are connected and installed inside the core body 7-7 via inter-group insulating pads 7-3. The inter-group insulating pads 7-3 serve as insulation between the individual capacitor noise-reducing units 7-10. Each capacitor noise-reducing unit 7-10 contains a total of 20 capacitor elements 7-2 and internal noise-reducing bodies 7-6. The capacitor elements 7-2 are connected in parallel to the internal noise-reducing bodies 7-6 via intermediate connecting pieces 7-4. The four capacitor noise-reducing units 7-10 are connected in series via intermediate connecting pieces 7-4 to ensure the product's voltage rating and capacity.

[0069] Preferably, each capacitor noise reduction unit 7-10 contains a total of 20 capacitor elements 7-2 and internal noise reduction bodies 7-6, specifically 16 capacitor elements 7-2 and 4 internal noise reduction bodies 7-6 arranged in an alternating and stacked manner: 4 capacitor elements 7-2, 1 internal noise reduction body 7-6; 4 capacitor elements 7-2, 1 internal noise reduction body 7-6; 4 capacitor elements 7-2, 1 internal noise reduction body 7-6; 4 capacitor elements 7-2, 1 internal noise reduction body 7-6.

[0070] Preferably, each capacitor noise reduction unit 7-10 contains a total of 20 capacitor elements 7-2 and internal noise reduction bodies 7-6, specifically 17 capacitor elements 7-2 and 3 internal noise reduction bodies 7-6 arranged in an alternating and stacked manner: 4 capacitor elements 7-2, 1 internal noise reduction body 7-6, 4 capacitor elements 7-2, 1 internal noise reduction body 7-6, 4 capacitor elements 7-2, 1 internal noise reduction body 7-6, and 5 capacitor elements 7-2.

[0071] like Figure 4 and Figure 5 As shown, the length and width of the internal noise reduction body 7-6 are the same as those of the capacitor element 7-2. The internal noise reduction body 7-6 includes a cover A, and a cover B is fixed on the inner side of the cover A.

[0072] Example 5:

[0073] like Figure 1 and Figure 2 As shown, this utility model provides a noise-reducing power capacitor. Based on the above-mentioned noise-reducing core of a power capacitor, it includes a capacitor shell 5. A top soundproof cover 2 is installed on the top of the capacitor shell 5 through a sealing gasket, which can isolate or reduce the noise transmitted from the top when the capacitor is running. A bottom soundproof cover 6 is installed on the bottom of the capacitor shell 5 through a sealing gasket, which can isolate or reduce the noise transmitted from the bottom when the capacitor is running. A wire outlet sleeve 1 is installed through the top of the capacitor shell 5 through the top soundproof cover 2. The wire outlet sleeve 1 is electrically connected to the lead-out connecting piece 7-1 to realize the two electrodes of the capacitor outlet. The noise-reducing core 7 is installed inside the capacitor shell 5. Several lifting rods 8 are installed on both sides of the capacitor shell 5, which can not only be used to lift the entire product, but also ensure the mechanical connection and fixation between the top soundproof cover 2 and the shell 5, and the bottom soundproof cover 6 and the shell 5.

[0074] like Figure 6 and Figure 7 As shown, the top soundproof cover 2 includes a first cover body 2-1, and a plurality of cover rings 2-2 are provided on the first cover body 2-1;

[0075] like Figure 10 , Figure 11 , Figure 12 , Figure 13 , Figure 14 and Figure 15 As shown, first support members 2-3 are installed on both sides of the first cover 2-1, the cover ring 2-2 is fixed to the capacitor shell 5 by the small sealing gasket 3, and the first cover 2-1 is fixed to the capacitor shell 5 by the large sealing gasket 4, which is responsible for sealing and preventing noise leakage.

[0076] like Figure 8 and Figure 9 As shown, the bottom soundproof cover 6 includes a second cover body 6-1, with second support members 6-2 installed on the outer top sides of the second cover body 6-1, and third support members 6-3 installed on the inner bottom sides of the second cover body 6-1.

[0077] like Figure 12 , Figure 13 , Figure 14 and Figure 15 As shown, the second cover 6-1 is fixed to the capacitor housing 5 by a large sealing gasket 4;

[0078] Preferably, the small sealing gasket 3 is made of rubber or other materials with good resistance to aging caused by heat, cold and light in the natural environment, and its shape matches the top soundproof cover 2 and the bottom soundproof cover 6.

[0079] Example 6:

[0080] like Figure 1 and Figure 2 As shown, this utility model provides a noise-reducing power capacitor. Based on the above-mentioned noise-reducing core of a power capacitor, it includes a capacitor shell 5. A top soundproof cover 2 is installed on the top of the capacitor shell 5 through a sealing gasket, which can isolate or reduce the noise transmitted from the top when the capacitor is running. A bottom soundproof cover 6 is installed on the bottom of the capacitor shell 5 through a sealing gasket, which can isolate or reduce the noise transmitted from the bottom when the capacitor is running. A wire outlet sleeve 1 is installed through the top of the capacitor shell 5 through the top soundproof cover 2. The wire outlet sleeve 1 is electrically connected to the lead-out connecting piece 7-1 to realize the two electrodes of the capacitor outlet. The noise-reducing core 7 is installed inside the capacitor shell 5. Several lifting rods 8 are installed on both sides of the capacitor shell 5, which can not only be used to lift the entire product, but also ensure the mechanical connection and fixation between the top soundproof cover 2 and the shell 5, and the bottom soundproof cover 6 and the shell 5.

[0081] like Figure 6 and Figure 7 As shown, the top soundproof cover 2 includes a first cover body 2-1, and a plurality of cover rings 2-2 are provided on the first cover body 2-1;

[0082] like Figure 10 , Figure 11 , Figure 12 , Figure 13 , Figure 14 and Figure 15 As shown, first support members 2-3 are installed on both sides of the first cover 2-1, the cover ring 2-2 is fixed to the capacitor shell 5 by the small sealing gasket 3, and the first cover 2-1 is fixed to the capacitor shell 5 by the large sealing gasket 4, which is responsible for sealing and preventing noise leakage.

[0083] like Figure 8 and Figure 9 As shown, the bottom soundproof cover 6 includes a second cover body 6-1, with second support members 6-2 installed on the outer top sides of the second cover body 6-1, and third support members 6-3 installed on the inner bottom sides of the second cover body 6-1.

[0084] like Figure 12 , Figure 13 , Figure 14 and Figure 15 As shown, the second cover 6-1 is fixed to the capacitor housing 5 by a large sealing gasket 4;

[0085] Preferably, the outer casing 5 is made of 1.5 mm thick stainless steel plate;

[0086] Preferably, both the top soundproof cover 2 and the bottom soundproof cover 6 are welded from 1.5 mm thick stainless steel plate 409 L, and their height can be adjusted to ensure air gap when assembled with the outer shell 5, thereby reducing top noise.

[0087] Preferably, the outgoing bushing 1 is a high-voltage porcelain enamelware;

[0088] Preferably, the number of outgoing sleeves 1 is 2;

[0089] Preferably, the hanging bracket 8 is made of 2.5 mm thick stainless steel plate;

[0090] Preferably, the small sealing gasket 3 is made of nitrile rubber and its shape matches that of the top soundproof cover 2 and the bottom soundproof cover 6.

[0091] This invention can reduce noise using only the noise-reducing core, or only the top soundproof cover 2 and the bottom soundproof cover 6, or by combining the inside and outside, i.e., the noise-reducing core, the top soundproof cover 2 and the bottom soundproof cover 6 together. Each time, simulation calculations and actual measurements are performed based on the specific harmonic situation.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A noise-reducing core for a power capacitor, characterized in that, The device includes a core body (7-7), with end insulating pads (7-5) installed at the top and bottom of the core body (7-7), and lead-out connecting pieces (7-1) installed on the end insulating pads (7-5); several capacitor noise reduction units (7-10) are installed inside the core body (7-7) through inter-group insulating pads (7-3); several capacitor elements (7-2) are installed inside the capacitor noise reduction units (7-10); several internal noise reduction bodies (7-6) are connected in parallel between the several capacitor elements (7-2) through intermediate connecting pieces (7-4); and several capacitor noise reduction units (7-10) are connected in series between the several capacitor elements (7-2) through intermediate connecting pieces (7-4).

2. The noise-reducing core of a power capacitor according to claim 1, characterized in that, The number of capacitor elements (7-2) and internal noise reduction bodies (7-6) inside each capacitor noise reduction unit (7-10) is 4 to 20, wherein the number of capacitor elements (7-2) is greater than or equal to the number of internal noise reduction bodies (7-6).

3. The noise-reducing core of a power capacitor according to claim 1, characterized in that, The length and width of the internal noise reduction element (7-6) are the same as those of the capacitor element (7-2).

4. The noise-reducing core of a power capacitor according to claim 1, characterized in that, The internal noise reduction body (7-6) includes a cover A (7-8), and a cover B (7-9) is fixed on the inner side of the cover A.

5. A noise-reducing power capacitor, based on the noise-reducing core of a power capacitor according to any one of claims 1-4, characterized in that, The capacitor housing (5) includes a top soundproof cover (2) and a bottom soundproof cover (6) installed on the top and bottom of the capacitor housing (5) respectively through sealing gaskets. A cable sleeve (1) is installed on the top of the capacitor housing (5) through the top soundproof cover (2). A noise reduction core (7) is installed inside the capacitor housing (5). Several hanging rods (8) are installed on both sides of the capacitor housing (5).

6. A noise-reducing power capacitor according to claim 5, characterized in that, The outgoing sleeve (1) is connected to the lead-out connecting piece (7-1).

7. A noise-reducing power capacitor according to claim 5, characterized in that, The top soundproof cover (2) includes a first cover body (2-1), a plurality of cover rings (2-2) are provided on the first cover body (2-1), and first support members (2-3) are respectively installed on both sides of the first cover body (2-1).

8. A noise-reducing power capacitor according to claim 7, characterized in that, The cover ring (2-2) is fixed to the capacitor shell (5) by a small sealing gasket (3); the first cover (2-1) is fixed to the capacitor shell (5) by a large sealing gasket (4).

9. A noise-reducing power capacitor according to claim 5, characterized in that, The bottom soundproof cover (6) includes a second cover (6-1), with second support members (6-2) installed on the outer top sides of the second cover (6-1) and third support members (6-3) installed on the inner bottom sides of the second cover (6-1).

10. A noise-reducing power capacitor according to claim 9, characterized in that, The second cover (6-1) is fixed to the capacitor housing (5) by a large sealing gasket (4).

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