阅读说明：本技术 滤波电容器降噪装置 (Noise reduction device of filter capacitor ) 是由 娄伟 刘乐 王建军 王永翔 郭飞 汪洪 王永胜 王付杰 蔡豪 张嵩阳 李中辉 于 2021-08-18 设计创作，主要内容包括：一种滤波电容器降噪装置,包括外壳体、内壳体和滤波电容器,所述滤波电容器设置在所述内壳体内,在所述内壳体上固定有第一电极,所述第一电极与所述滤波电容器柔性电连接,所述内壳体与所述滤波电容器通过弹性阻尼件支撑连接,在所述内壳体与所述滤波电容器之间设有真空隔声层,所述外壳体与所述内壳体之间设有吸声导热棉层。它可以隔绝滤波电容器工作时发出的噪声与外界环境的传导,但又可以向外传导滤波电容器工作时发出的热量。(The utility model provides a device of making an uproar falls in filter capacitor, includes shell body, interior casing and filter capacitor, filter capacitor sets up in the interior casing be fixed with first electrode on the interior casing, first electrode with filter capacitor flexonics connects, interior casing with filter capacitor passes through elastic damping spare and supports the connection interior casing with be equipped with the vacuum sound insulation layer between the filter capacitor, the shell body with be equipped with the cotton layer of sound absorption heat conduction between the interior casing. The noise-isolating filter capacitor can isolate the conduction of noise and the external environment when the filter capacitor works, and can conduct heat outwards when the filter capacitor works.)

1. The utility model provides a device of making an uproar falls in filter capacitor, includes shell body, interior casing and filter capacitor, filter capacitor sets up in the interior casing be fixed with first electrode on the interior casing, its characterized in that, first electrode with filter capacitor flexoelectric connection, interior casing with filter capacitor passes through elastic damping spare support connection interior casing with be equipped with the vacuum sound insulation layer between the filter capacitor, the shell body with be equipped with the cotton layer of sound absorption heat conduction between the interior casing.

2. The filter capacitor noise reduction apparatus of claim 1, wherein the filter capacitor is fixedly disposed within an envelope, a second electrode is fixed to the envelope, the second electrode is fixedly connected to the first electrode by a conductive spring, and the other end of the envelope is fixedly connected to the inner housing by a compression spring.

3. The filter capacitor noise reduction apparatus of claim 2, wherein the conductive spring comprises a bellows made of a conductive material and a viscoelastic material filled in the bellows.

4. The filter capacitor noise reduction apparatus of claim 1, wherein the layer of acoustic and thermally conductive cotton comprises acoustic cotton impregnated with a thermally conductive and insulating oil.

5. The filter capacitor noise reduction apparatus of claim 1, wherein the outer housing is a metal housing.

6. The filter capacitor noise reduction apparatus of claim 1, wherein the inner housing is a thermally conductive and insulative housing.

7. The filter capacitor noise reduction device according to claim 1, wherein the elastic damping member has a damping ratio of 3 to 4, an elastic coefficient of 8 to 9, and a thickness of the vacuum insulation layer of 40 to 50 mm.

Technical Field

The invention relates to the technical field of noise reduction of electric appliances, in particular to a noise reduction device of a filter capacitor.

Background

The technical specifications of CIGRE and IEC on converter station equipment noise indicate that the noise power level of a filter capacitor can reach 105dB (A) and the noise power level of a filter reactor can reach 90dB (A). The continuous noise has great influence on the surrounding environment, the long-term excessive vibration can cause great damage to the capacitor body structure, the service life of the capacitor body structure is seriously shortened, even faults are caused, and great economic loss is caused. In addition, the converter stations are generally evaluated according to the type II sound environment functional area, namely 60dB (A) in daytime and 50dB (A) at night are met. Therefore, the problem of noise of the filter capacitor body needs to be solved from the viewpoint of equipment structure.

Patent document CN213691427U describes a high-voltage filter capacitor multistage noise reduction device, including: a shell and a core; the core is arranged in the shell, and two ends of the core are respectively connected with the first polyurethane elastomer unit and the second polyurethane elastomer unit; the first polyurethane elastomer unit is connected with a first sound absorption cotton unit, and a first Helmholtz resonant cavity unit is arranged in the first sound absorption cotton unit; a vacuum layer unit is arranged between the first sound absorption cotton unit and the shell; the second polyurethane elastomer unit is connected with a second sound absorption cotton unit, and a second Helmholtz resonant cavity unit is arranged in the second sound absorption cotton unit. The technical scheme can reduce the sound transmitted outside by the filter capacitor, but is not beneficial to the heat dissipation of the filter capacitor.

Disclosure of Invention

The invention aims to provide a noise reduction device of a filter capacitor, which aims to solve the problems that the noise generated by the filter capacitor during working pollutes the environment and the heat generated by the filter capacitor during working influences the service life of the filter capacitor.

The technical scheme of the invention is as follows:

the utility model provides a device of making an uproar falls in filter capacitor, includes shell body, interior casing and filter capacitor, filter capacitor sets up in the interior casing be fixed with first electrode on the interior casing, first electrode with filter capacitor flexonics connects, interior casing with filter capacitor passes through elastic damping spare and supports the connection interior casing with be equipped with the vacuum sound insulation layer between the filter capacitor, the shell body with be equipped with the cotton layer of sound absorption heat conduction between the interior casing.

Preferably, the filter capacitor is fixedly arranged in a cladding, a second electrode is fixed on the cladding, the second electrode is fixedly connected with the first electrode through a conductive spring, and the other end of the cladding is fixedly connected with the inner shell through a compression spring.

Preferably, the conductive spring comprises a corrugated pipe and a viscoelastic material, the corrugated pipe is made of a conductive material, and the viscoelastic material is filled in the corrugated pipe.

Preferably, the sound absorption and heat conduction cotton layer comprises sound absorption cotton soaked with heat conduction insulating oil.

Preferably, the outer shell is a metal shell.

Preferably, the inner shell is a heat conducting insulating shell.

Preferably, the damping ratio of the elastic damping part is 3-4, the elastic coefficient is 8-9, and the thickness of the vacuum sound insulation layer is 40-50 mm.

The invention has the beneficial effects that:

1. the elastic damping member supports and connects the inner case and the filter capacitor, and the first electrode is flexibly and electrically connected with the filter capacitor, and a vacuum sound insulation layer is arranged between the inner shell and the filter capacitor, so that the inner shell, the elastic damping piece and the filter capacitor form a sound insulation core, in the sound insulation core, the vacuum sound insulation layer can isolate sound wave conduction and can provide a moving space for the filter capacitor to vibrate in the inner shell, the elastic damping part can reduce the vibration energy of the filter capacitor in the inner shell, in an ideal state, the vibration of the filter capacitor in the inner shell is difficult to be expressed on the sound insulation core layer, namely the vibration and the vibration sounding of the filter capacitor are difficult to be expressed through the inner shell, and because heat conduction has three kinds of modes, the heat that filter capacitor work released can be passed through heat radiation conduction and give the interior casing to realize radiating purpose. Even under the non-ideal state, the sound absorption and heat conduction layer can absorb weak sound appearing in the sound insulation core and conduct heat released by the filter capacitor during working. The noise-isolating filter capacitor can isolate the conduction of noise and the external environment when the filter capacitor works, and can conduct heat outwards when the filter capacitor works.

Drawings

Fig. 1 is a schematic structural diagram of a noise reduction device with a filter capacitor.

The reference number indicates that 1-insulating support shell, 2-outer shell, 3-inner shell, 4-cladding, 51-filter capacitor, 52-second electrode, 53-conductive spring, 54-second electrode, 55-wire, 56-compression spring, 61-vacuum sound insulation layer, 62-sound absorption and heat conduction cotton layer.

Detailed Description

The present invention is described below in terms of embodiments in conjunction with the accompanying drawings to assist those skilled in the art in understanding and implementing the present invention. Unless otherwise indicated, the following embodiments and technical terms therein should not be understood to depart from the background of the technical knowledge in the technical field.

Example 1: a filter capacitor noise reduction device includes an outer case 2, an inner case 3, and a filter capacitor 51.

A first electrode 54 is fixed to the inner housing 3 so that a closed cavity is formed in the inner housing 3.

In the present embodiment, the filter capacitor 51 is fixedly provided in the envelope 4. A second electrode 52 is provided on the envelope 4 to facilitate the access of the filter capacitor 51 to the circuit.

The filter capacitor 51 is disposed in the inner case 3, and the first electrode 54 is flexibly electrically connected to the filter capacitor 51 group. In the prior art, flexible electrical connection can be realized through flexible wires and deformable wires. The flexible electrical connection may allow movement of the filter capacitor within the inner housing so as to block vibration conduction of the filter capacitor to the inner housing.

The inner housing 3 and the filter capacitor 51 are supported and connected by an elastic damping member. Referring to fig. 1, the filter capacitor 51 is a cylinder, one end of the inner housing 3 is electrically connected to the filter capacitor 51 through a conductive spring 53, and the other end of the inner housing 3 is supported and connected to the filter capacitor 51 through a compression spring 56. The conductive springs 53 and the compression springs 56 are elastic damping members, which allow the filter capacitor to move within the inner housing while supporting and connecting the inner housing 3 and the filter capacitor 51, so as to block the vibration transmission of the filter capacitor to the inner housing, and simultaneously, to damp the vibration energy of the filter capacitor. In the present embodiment, the conductive spring 53 electrically connects the first electrode 54 and the second electrode 53.

A vacuum sound insulation layer 61 is provided between the inner case 3 and the filter capacitor 51. The vacuum sound insulation layer 61 can insulate the conduction of sound but not heat, so that it can realize the effects of sound insulation and heat conduction.

In summary, the inner housing, the filter capacitor and the elastic damping member form a sound insulating core. Based on the common knowledge of physics, the vibration part in the sound insulation core is consumed by the elastic damping piece, and the unconsumed part is represented by the vibration of the inner shell. The presence of the elastic damping member may reduce the frequency and sound of the vibrations exhibited by the inner hull.

In this embodiment, a sound-absorbing and heat-conducting cotton layer 62 is disposed between the outer casing 2 and the inner casing 3.

In this embodiment, the sound absorbing and heat conducting cotton layer 62 comprises sound absorbing cotton impregnated with heat conducting insulating oil.

In this embodiment, the outer case 2 is a metal case.

In this embodiment, the inner housing 3 is a heat-conductive insulating housing.

In this embodiment, the conductive spring is configured such that the conductive spring includes a bellows made of a conductive material and a viscoelastic material filled in the bellows.

Through tests, when only a filter capacitor with the rated voltage of 6.3kV and the rated capacity of 470kvar is arranged, the measured noise is 65.4dB under the working condition of BP13, the temperature of the shell of a product is 66 ℃ after the thermal stability test process, and finally the temperature rise variation is smaller than 1K in 6 hours. When the device is used, the damping ratio of the elastic damping part is 3-4, the elastic coefficient is 8-9, the thickness of the vacuum sound insulation layer is 40-50 mm, when a filter capacitor with the rated voltage of 6.3kV and the rated capacity of 470kvar is used, the measured noise is 60.2dB under the working condition of BP13, the temperature of the shell of a product is 65.5 ℃ after the thermal stability test process, and finally the temperature rise variation is less than 1K in 6 hours.

The invention is described in detail above with reference to the figures and examples. It should be understood that in practice the description of all possible embodiments is not exhaustive and that the inventive concepts are described herein as far as possible by way of illustration. Without departing from the inventive concept of the present invention and without any creative work, a person skilled in the art should, in all of the embodiments, make optional combinations of technical features and experimental changes of specific parameters, or make a routine replacement of the disclosed technical means by using the prior art in the technical field to form specific embodiments, which belong to the content implicitly disclosed by the present invention.