Noise reduction power capacitor and noise reduction core

Abstract

The invention provides a noise reduction power capacitor and a noise reduction core, and belongs to the technical field of mechanical manufacturing, the noise reduction power capacitor comprises a capacitor shell, the top and the bottom of the capacitor shell are respectively provided with a top sound-proof cover and a bottom sound-proof cover through sealing washers, and the top of the capacitor shell is provided with a wire outlet sleeve 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 invention, 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 and other methods can be independently used according to different frequencies and sizes of the harmonic current borne by the power capacitor so as to reduce the noise.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical manufacturing, and in particular to a noise reduction power capacitor and a noise reduction core. Background Art

[0002] With the development of the national power industry, especially in the past two decades, in order to meet the electricity demand in developed areas, the country has invested a lot of money in the construction of high-voltage direct current transmission projects; power capacitors are one of the indispensable equipment in the converter station of high-voltage direct current transmission projects. First, they provide the required reactive power for the converter, and second, they are used to filter out the harmonics generated in the conversion of AC and DC systems.

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

[0004] In order to reduce the noise of power capacitors during use in converter stations, capacitor manufacturers have conducted a lot of research work, and the noise reduction methods are different. Each capacitor in the converter station bears different harmonic currents and generates different noise levels. The use of noise reduction elements inside the capacitor can only solve the noise problem caused by low-frequency harmonics, but has little improvement on the noise problem caused by high-order harmonics. Summary of the invention

[0005] The purpose of the present invention is to provide a noise reduction power capacitor and a noise reduction core to overcome the problems existing in the prior art. The present invention can solve the noise problem caused by the harmonic currents of the capacitor by internal noise reduction, external noise reduction or a combination of internal and external noise reduction. At the same time, according to the different frequencies and sizes of the harmonic currents borne by the power capacitor, internal noise reduction, external noise reduction or a combination of internal and external noise reduction can also be used alone. The number of internal noise reduction bodies and their placement positions in the core, and the cavity distance between the external sound insulation cover and the shell can be adjusted according to the size of the noise, thereby achieving the purpose of reducing noise.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows: A power capacitor noise reduction core comprises a core body, the top and bottom of the core body are respectively provided with end insulating pads, and a lead-out connecting piece is provided on the end insulating pads; a plurality of capacitor noise reduction units are connected and installed inside the core body through inter-group insulating pads, a plurality of capacitor elements are installed inside the capacitor noise reduction unit, a plurality of internal noise reduction bodies are connected in parallel between the plurality of capacitor elements through an intermediate connecting piece, and a plurality of capacitor noise reduction units are connected in series through the intermediate connecting piece; Furthermore, the number of the capacitor elements and the internal noise reduction bodies inside each capacitor noise reduction unit is 4 to 20 in total, wherein the number of the capacitor elements is greater than or equal to the number of the internal noise reduction bodies; Further, the length and width of the internal noise reduction body are the same as those of the capacitor element; Furthermore, the internal noise reduction body includes a cover A, and a cover B is fixed to an inner side of the cover A.

[0007] A noise reduction power capacitor, based on the above-mentioned power capacitor noise reduction core, comprises a capacitor housing, a top soundproof cover and a bottom soundproof cover are respectively installed on the top and bottom of the capacitor housing through sealing gaskets, and an outlet bushing is installed on the top of the capacitor housing through the top soundproof cover; a noise reduction core is installed inside the capacitor housing, and a plurality of hanging brackets are respectively installed on both sides of the capacitor housing; Furthermore, the outlet bushing is connected to the lead-out connecting piece; Furthermore, the top sound insulation cover comprises a first cover body, a plurality of cover rings are arranged on the first cover body, and first support members are respectively installed on both sides of the first cover body; Further, the cover ring is fixed to the capacitor housing via a small sealing gasket; the first cover body is fixed to the capacitor housing via a large sealing gasket; Furthermore, the bottom soundproof cover comprises a second cover body, second supporting members are respectively installed on two outer sides of the top of the second cover body, and third supporting members are respectively installed on two inner sides of the bottom of the second cover body; Furthermore, the second cover is fixed to the capacitor housing via a large sealing gasket.

[0008] The above technical solution has the following advantages or beneficial effects: The present invention provides a noise reduction core of a power capacitor. By installing an internal noise reduction body inside the core body, the noise generated by the power capacitor when it is subjected to various harmonic currents can be effectively reduced, which not only improves the comfort of the product's use environment, but also reduces the potential interference of noise to the surrounding environment and personnel; the number of internal noise reduction bodies and their placement positions in the core can be adjusted according to the size of the noise, so that the noise reduction effect can be further optimized, ensuring that the best noise reduction effect can be achieved under different working conditions; long-term exposure to noise caused by harmonic currents not only affects the service life of the product, but may also have an adverse effect on the stability of the power system. The present invention not only effectively reduces the noise, but also indirectly improves the overall performance and reliability of the power capacitor, thereby extending the service life of the product.

[0009] Furthermore, by combining capacitor elements and internal noise reduction bodies in a certain number and connecting them with inter-group insulating pads, the structure of the core is made more compact. At the same time, due to the presence of the internal noise reduction bodies, the noise generated by the capacitor elements in each group can be effectively absorbed and reduced, thereby improving the noise reduction efficiency; the use of inter-group insulating pads not only ensures the electrical isolation inside the capacitor, but also prevents mutual influence between the capacitor elements, ensuring the stability and reliability of the capacitor; 4 to 20 capacitor elements and noise reduction bodies provide greater flexibility. According to actual needs, the number of capacitor elements and noise reduction bodies in each capacitor noise reduction unit can be adjusted to meet capacitors with different capacities and noise reduction requirements.

[0010] Further, because the dimensions of the internal noise reduction body match those of the capacitor element, they can fit tightly together, thereby minimizing the possibility of noise generated by the capacitor element escaping into the surrounding environment.

[0011] The present invention also provides a noise reduction power capacitor. By combining an internal noise reduction core with an external sound insulation cover, the noise reduction power capacitor achieves multiple barriers and absorption of noise. The internal noise reduction core effectively reduces the noise generated by the capacitor element, while the external sound insulation cover further isolates and reduces the propagation of noise, thereby significantly improving the overall noise reduction effect. At the same time, the noise reduction method of the present invention is highly flexible. According to the different frequencies and sizes of harmonic currents borne by the power capacitor, internal noise reduction, external noise reduction, or a combination of the two can be selected to be used alone, so that the noise reduction scheme can be optimized for specific capacitor working conditions to achieve more accurate and effective noise reduction. The capacitor housing and the top and bottom sound insulation covers are installed with sealing gaskets to ensure the sealing performance inside the capacitor. The addition of a hanging hook makes the capacitor more stable during installation and transportation, reduces the risk of damage caused by vibration or impact, and improves the safety and reliability of the capacitor.

[0012] Furthermore, the connection between the outlet bushing and the lead-out connecting piece ensures the stability of the electrical connection between the internal and external circuits of the capacitor, reduces the risk of electrical failure due to poor or loose connections, and improves the operational reliability of the capacitor.

[0013] Furthermore, the first cover body, as the main body of the top sound insulation cover, can be more stably installed on the top of the capacitor housing through the cover ring arranged thereon and the first support members on both sides.

[0014] Furthermore, the use of the sealing gasket enables the cover ring and the first cover body to be more conveniently fixed to the capacitor housing.

[0015] Furthermore, the addition of the second support member and the third support member significantly enhances the structural stability and support of the bottom sound insulation cover, which not only helps to fix the bottom sound insulation cover, but also prevents it from being displaced or damaged due to vibration or impact during the operation of the capacitor, thereby ensuring the stable operation of the capacitor.

[0016] Furthermore, the use of a large sealing gasket ensures a close fit between the second cover and the capacitor housing, effectively preventing external impurities such as dust and moisture from entering the interior of the capacitor, and helping to extend the service life and performance stability of the capacitor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A front view of a noise reduction power capacitor of the present invention; Figure 2 A side view of a noise reduction power capacitor of the present invention; Figure 3 This is a structural schematic diagram of a noise reduction core of a power capacitor according to the present invention; Figure 4 This is a schematic diagram of the installation of an internal noise reduction body of a noise reduction core of a power capacitor according to the present invention; Figure 5 It is a front view of the internal noise reduction body of a noise reduction core of a power capacitor of the present invention; Figure 6 A top view of a top soundproof cover of a noise reduction power capacitor of the present invention; Figure 7 A cross-sectional view of a top soundproof cover of a noise-reducing power capacitor of the present invention; Figure 8 A front view of a bottom soundproof cover of a noise-reducing power capacitor according to the present invention; Fig. 9 A top view of a bottom soundproof cover of a noise reduction power capacitor of the present invention; Fig.10 A top view of a small sealing gasket of a noise reduction power capacitor of the present invention; Fig.11 For the present invention Fig.10 A partial cross-sectional view of the middle BB; Fig.12 A top view of a large sealing gasket of a noise reduction power capacitor of the present invention; Fig.13 For the present invention Fig.12 Partial cross-sectional view of AA; Fig.14 For the present invention Fig.12 A partial cross-sectional view of the middle BB; Fig.15 For the present invention Fig.12 Partial cross-sectional view of CC; In the figure, 1-outlet bushing; 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 housing; 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 connecting piece; 7-2-capacitor element; 7-3-inter-group insulating pad; 7-4-middle 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. DETAILED DESCRIPTION

[0018] The present invention is further described in detail below in conjunction with specific embodiments, which are intended to explain the present invention rather than to limit it. In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention. It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0019] Embodiment 1: like Figure 3As shown, the present invention provides a power capacitor noise reduction core, including a core body 7-7, the top and bottom of the core body 7-7 are respectively installed with end insulating pads 7-5, which are used as clamping plates of the entire core to ensure the stability of the shape of the core, and the end insulating pads 7-5 are installed with lead-out connecting pieces 7-1; the interior of the core body 7-7 is connected and installed with a plurality of capacitor noise reduction units 7-10 through inter-group insulating pads 7-3, and the inter-group insulating pads 7-3 are used as insulation between each capacitor noise reduction unit 7-10, and the interior of the capacitor noise reduction unit 7-10 is stacked and installed with a plurality of capacitor elements 7-2, and a plurality of capacitor elements A plurality of internal noise reduction bodies 7-6 are connected in parallel between 7-2 through an intermediate connecting piece 7-4. The thickness, quantity and placement position of the internal noise reduction bodies 7-6 in the core vary according to the size of the noise current borne by each capacitor, so as to achieve the purpose of reducing the operating noise of the capacitor; 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 in total, among which the number of capacitor elements 7-2 is greater than or equal to the number of internal noise reduction bodies 7-6; a plurality of capacitor noise reduction units 7-10 are connected in series through an intermediate connecting piece 7-4 to ensure the product voltage level and capacity.

[0020] 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, and 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; 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 tinned copper strips; 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; 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 longer than the lead-out connecting piece 7-1 installed on the insulating pad 7-5 at the top end, and can be wound from the side to the top, so that the top and bottom end insulating pads 7-5 are both electrically connected to the lead-out bushing 1, so as to realize the lead-out of the two electrodes of the capacitor; Preferably, the capacitor element 7-2 is a rectangular capacitor formed by winding a polypropylene film and an aluminum foil, which is responsible for energy storage, and has electrodes at both ends; Preferably, the inter-group insulating pad 7-3 is an insulating cardboard with a thickness of 0.3 mm; Preferably, the end insulating pad 7-5 is an insulating paperboard with a thickness of 4 mm; Preferably, the internal noise reduction body 7-6 is a rectangular cavity formed by welding and fixing a 1.5 mm thick stainless steel plate 409 L cover A and a cover B. The thickness of the steel plate and the welding strength are required to ensure that the entire capacitor product will not deform or leak during the vacuum treatment process.

[0021] Embodiment 2: like Figure 3 As shown, the present invention provides a power capacitor noise reduction core, including a core body 7-7, the top and bottom of the core body 7-7 are respectively installed with end insulating pads 7-5, which are used as clamping plates of the entire core to ensure the stability of the shape of the core, and the end insulating pads 7-5 are installed with a lead-out connecting piece 7-1; the inside of the core body 7-7 is connected and installed with 5 capacitor noise reduction units 7-10 through inter-group insulating pads 7-3, and the inter-group insulating pads 7-3 are used as insulation between each capacitor noise reduction unit 7-10. The number of capacitor elements 7-2 and internal noise reduction bodies 7-6 inside each capacitor noise reduction unit 7-10 is 4 in total, 2 capacitor elements 7-2 and 2 internal noise reduction bodies 7-6 are evenly interspersed and stacked, the capacitor element 7-2 is connected in parallel to the internal noise reduction body 7-6 through the intermediate connecting piece 7-4, and the 5 capacitor noise reduction units 7-10 are connected in series through the intermediate connecting piece 7-4 to ensure the product voltage level and capacity.

[0022] 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.

[0023] Embodiment 3: like Figure 3 As shown, the present invention provides a power capacitor noise reduction core, including a core body 7-7, the top and bottom of the core body 7-7 are respectively installed with end insulating pads 7-5, which are used as clamping plates of the entire core to ensure the stability of the shape of the core, and the end insulating pads 7-5 are installed with a lead-out connecting piece 7-1; the interior of the core body 7-7 is connected and installed with 6 capacitor noise reduction units 7-10 through inter-group insulating pads 7-3, and the inter-group insulating pads 7-3 are used as insulation between each capacitor noise reduction unit 7-10. The number of capacitor elements 7-2 and internal noise reduction bodies 7-6 in each capacitor noise reduction unit 7-10 is 13 in total, and the capacitor element 7-2 is connected in parallel to the internal noise reduction body 7-6 through the intermediate connecting piece 7-4, and the 5 capacitor noise reduction units 7-10 are connected in series through the intermediate connecting piece 7-4 to ensure the product voltage level and capacity size; Preferably, the number of capacitor elements 7-2 and internal noise reduction bodies 7-6 inside each capacitor noise reduction unit 7-10 is 13 in total, specifically, 9 capacitor elements 7-2 and 4 internal noise reduction bodies 7-6 are arranged in an interlaced stack: 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, 2 capacitor elements 7-2, 1 internal noise reduction body 7-6, 1 capacitor element 7-2; Preferably, the number of capacitor elements 7-2 and internal noise reduction bodies 7-6 inside each capacitor noise reduction unit 7-10 is 13 in total, specifically, 9 capacitor elements 7-2 and 4 internal noise reduction bodies 7-6 are arranged in an interlaced stack: 4 capacitor elements 7-2, 2 internal noise reduction bodies 7-6, 4 capacitor elements 7-2, 2 internal noise reduction bodies 7-6, 1 capacitor element 7-2; Preferably, the number of capacitor elements 7-2 and internal noise reduction bodies 7-6 inside each capacitor noise reduction unit 7-10 is 13 in total, specifically, 9 capacitor elements 7-2 and 4 internal noise reduction bodies 7-6 are arranged in an interlaced stack: 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; Preferably, the number of capacitor elements 7-2 and internal noise reduction bodies 7-6 inside each capacitor noise reduction unit 7-10 is 13 in total, specifically, 10 capacitor elements 7-2 and 3 internal noise reduction bodies 7-6 are arranged in an interlaced stack: 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, 1 capacitor element 7-2; Preferably, the number of capacitor elements 7-2 and internal noise reduction bodies 7-6 inside each capacitor noise reduction unit 7-10 is 13 in total, specifically, 10 capacitor elements 7-2 and 3 internal noise reduction bodies 7-6 are arranged in an interlaced stack: 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.

[0024] 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.

[0025] Embodiment 4: like Figure 3As shown, the present invention provides a power capacitor noise reduction core, including a core body 7-7, the top and bottom of the core body 7-7 are respectively installed with end insulating pads 7-5, which are used as clamping plates of the entire core to ensure the stability of the shape of the core, and the end insulating pads 7-5 are installed with a lead-out connecting piece 7-1; the inside of the core body 7-7 is connected and installed with four capacitor noise reduction units 7-10 through inter-group insulating pads 7-3, and the inter-group insulating pads 7-3 are used as insulation between each capacitor noise reduction unit 7-10. The number of capacitor elements 7-2 and internal noise reduction bodies 7-6 in each capacitor noise reduction unit 7-10 is 20 in total, and the capacitor element 7-2 is connected in parallel to the internal noise reduction body 7-6 through an intermediate connecting piece 7-4, and the four capacitor noise reduction units 7-10 are connected in series through the intermediate connecting piece 7-4 to ensure the product voltage level and capacity size; Preferably, the number of capacitor elements 7-2 and internal noise reduction bodies 7-6 inside each capacitor noise reduction unit 7-10 is 20 in total, specifically, 16 capacitor elements 7-2 and 4 internal noise reduction bodies 7-6 are arranged in an interlaced stack: 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, 4 capacitor elements 7-2, 1 internal noise reduction body 7-6; Preferably, the number of capacitor elements 7-2 and internal noise reduction bodies 7-6 inside each capacitor noise reduction unit 7-10 is 20 in total, specifically, 17 capacitor elements 7-2 and 3 internal noise reduction bodies 7-6 are arranged in an interlaced stack: 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.

[0026] 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.

[0027] Embodiment 5: like Figure 1 and Figure 2As shown, a noise reduction power capacitor, based on the above-mentioned power capacitor noise reduction core, includes a capacitor housing 5, a top soundproof cover 2 is installed on the top of the capacitor housing 5 through a sealing gasket, which can isolate or reduce the noise transmitted from the top of the capacitor when it is running, and a bottom soundproof cover 6 is installed on the bottom of the capacitor housing 5 through a sealing gasket, which can isolate or reduce the noise transmitted from the bottom when the capacitor is running. The top of the capacitor housing 5 is penetrated by the top soundproof cover 2 and an outlet bushing 1 is installed, and the outlet bushing 1 is electrically connected to the lead-out connecting piece 7-1 to realize the outlet of the two electrodes of the capacitor, and a noise reduction core 7 is installed inside the capacitor housing 5, and a plurality of lifting clasps 8 are installed on both sides of the capacitor housing 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 housing 5, and the bottom soundproof cover 6 and the housing 5; like Figure 6 and Figure 7 As shown, the top sound insulation cover 2 includes a first cover body 2-1, and a plurality of cover rings 2-2 are arranged on the first cover body 2-1; like Fig.10 , Fig.11 , Fig.12 , Fig.13 , Fig.14 and Fig.15 As shown, first support members 2-3 are respectively installed on both sides of the first cover body 2-1, the cover ring 2-2 is fixed to the capacitor housing 5 through a small sealing gasket 3, and the first cover body 2-1 is fixed to the capacitor housing 5 through a large sealing gasket 4, which is responsible for sealing and preventing noise leakage; like Figure 8 and Fig. 9 As shown, the bottom soundproof cover 6 includes a second cover body 6-1, and second supporting members 6-2 are respectively installed on both sides of the top of the second cover body 6-1, and third supporting members 6-3 are respectively installed on both sides of the bottom of the second cover body 6-1; like Fig.12 , Fig.13 , Fig.14 and Fig.15 As shown, the second cover 6-1 is fixed to the capacitor housing 5 through a large sealing gasket 4; Preferably, the small sealing gasket 3 is made of rubber or the like, which has good aging resistance to heat, cold, light and the like in the natural environment, and its shape matches the top sound insulation cover 2 and the bottom sound insulation cover 6 .

[0028] Embodiment 6: like Figure 1 and Figure 2As shown, a noise reduction power capacitor, based on the above-mentioned power capacitor noise reduction core, includes a capacitor housing 5, a top soundproof cover 2 is installed on the top of the capacitor housing 5 through a sealing gasket, which can isolate or reduce the noise transmitted from the top of the capacitor when it is running, and a bottom soundproof cover 6 is installed on the bottom of the capacitor housing 5 through a sealing gasket, which can isolate or reduce the noise transmitted from the bottom when the capacitor is running. The top of the capacitor housing 5 is penetrated by the top soundproof cover 2 and an outlet bushing 1 is installed, and the outlet bushing 1 is electrically connected to the lead-out connecting piece 7-1 to realize the outlet of the two electrodes of the capacitor, and a noise reduction core 7 is installed inside the capacitor housing 5, and a plurality of lifting clasps 8 are installed on both sides of the capacitor housing 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 housing 5, and the bottom soundproof cover 6 and the housing 5; like Figure 6 and Figure 7 As shown, the top sound insulation cover 2 includes a first cover body 2-1, and a plurality of cover rings 2-2 are arranged on the first cover body 2-1; like Fig.10 , Fig.11 , Fig.12 , Fig.13 , Fig.14 and Fig.15 As shown, first support members 2-3 are respectively installed on both sides of the first cover body 2-1, the cover ring 2-2 is fixed to the capacitor housing 5 through a small sealing gasket 3, and the first cover body 2-1 is fixed to the capacitor housing 5 through a large sealing gasket 4, which is responsible for sealing and preventing noise leakage; like Figure 8 and Fig. 9 As shown, the bottom soundproof cover 6 includes a second cover body 6-1, and second supporting members 6-2 are respectively installed on both sides of the top of the second cover body 6-1, and third supporting members 6-3 are respectively installed on both sides of the bottom of the second cover body 6-1; like Fig.12 , Fig.13 , Fig.14 and Fig.15 As shown, the second cover 6-1 is fixed to the capacitor housing 5 through a large sealing gasket 4; Preferably, the housing 5 is a 1.5 mm thick stainless steel plate; Preferably, the top soundproof cover 2 and the bottom soundproof cover 6 are both welded from 1.5 mm thick stainless steel plate 409 L, and the height can be adjusted to ensure an air gap when assembled with the housing 5, thereby achieving the purpose of reducing the top noise; Preferably, the outlet bushing 1 is high voltage porcelain; Preferably, the number of outlet bushings 1 is 2; Preferably, the hanging climbing 8 is a 2.5 mm thick stainless steel plate; Preferably, the small sealing gasket 3 is made of nitrile rubber, and its shape matches the top sound insulation cover 2 and the bottom sound insulation cover 6 .

[0029] The present invention can achieve the purpose of reducing noise only through the noise reduction core, or only through the top sound insulation cover 2 and the bottom sound insulation cover 6, or through the coordination of the inside and the outside, that is, the noise reduction core, the top sound insulation cover 2 and the bottom sound insulation cover 6 together. Each time, simulation calculations will be performed according to the specific harmonic conditions and then actual measurements will be made for adjustment.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A power capacitor noise reduction core, characterized in that: The invention comprises a core body (7-7), the top and bottom of the core body (7-8) are respectively provided with end insulating pads (7-5), and a lead-out connecting piece (7-1) is provided on the end insulating pads (7-5); a plurality of capacitor noise reduction units (7-10) are connected and installed inside the core body (7-7) through inter-group insulating pads (7-3), a plurality of capacitor elements (7-2) are installed inside the capacitor noise reduction unit (7-10), a plurality of internal noise reduction bodies (7-6) are connected in parallel between the plurality of capacitor elements (7-2) through an intermediate connecting piece (7-4), and a plurality of capacitor noise reduction units (7-10) are connected in series through the intermediate connecting piece (7-4).

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

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

5. A noise reduction power capacitor, based on a power capacitor noise reduction core according to any one of claims 1 to 4, characterized in that: The invention comprises a capacitor housing (5), wherein a top soundproof cover (2) and a bottom soundproof cover (6) are respectively installed on the top and bottom of the capacitor housing (5) through sealing gaskets, and an outlet bushing (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), and a plurality of hanging brackets (8) are respectively installed on both sides of the capacitor housing (5).

6. A noise reduction power capacitor according to claim 5, characterized in that: The outlet bushing (1) is connected to the lead-out connecting piece (7-1).

7. A noise reduction power capacitor according to claim 5, characterized in that: The top sound insulation cover (2) comprises a first cover body (2-1), a plurality of cover rings (2-2) are arranged 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 reduction power capacitor according to claim 7, characterized in that: The cover ring (2-2) is fixed to the capacitor housing (5) via a small sealing gasket (3); and the first cover body (2-1) is fixed to the capacitor housing (5) via a large sealing gasket (4).

9. The noise reduction power capacitor according to claim 5, characterized in that: The bottom sound insulation cover (6) comprises a second cover body (6-1), second support members (6-2) are respectively installed on two outer sides of the top of the second cover body (6-1), and third support members (6-3) are respectively installed on two inner sides of the bottom of the second cover body (6-1).

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

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