阅读说明：本技术 一种带有通风消声风道的变流器 (Converter with ventilation noise elimination wind channel ) 是由 朱宇龙 丁杰 李奎 陈俊 李振鹏 贺建军 臧晓斌 廖俊翕 于 2019-02-26 设计创作，主要内容包括：本发明公开一种带有通风消声风道的变流器,包括柜体和电路器件,电路器件设置于柜体内,柜体的体壁上设置有进风口和出风口,柜体内部还设置有引流板,引流板设置于柜体和电路器件之间,引流板与柜体的部分体壁形成的空腔为通风消声风道,引流板的部分结构与进风口相对设置,引流板阻挡柜体内部产生的噪声直接通过进风口传播到柜体外。本发明中的带有通风消声风道的变流器在实现良好的通风散热的同时,可以很好地控制对于变流器产生的噪音。(The invention discloses a current transformer with a ventilation and noise elimination air channel, which comprises a cabinet body and a circuit device, wherein the circuit device is arranged in the cabinet body, an air inlet and an air outlet are formed in the wall of the cabinet body, a drainage plate is also arranged in the cabinet body and arranged between the cabinet body and the circuit device, a cavity formed by the drainage plate and part of the wall of the cabinet body is the ventilation and noise elimination air channel, part of the structure of the drainage plate is arranged opposite to the air inlet, and the drainage plate prevents noise generated in the cabinet body from directly spreading to the outside of the cabinet body through the air inlet. The converter with the ventilation and noise elimination air duct can well control the noise generated by the converter while realizing good ventilation and heat dissipation.)

1. The utility model provides a converter with ventilation noise elimination wind channel, includes the cabinet body and circuit device, the circuit device set up in it is internal that the cabinet is internal, be provided with air intake and air outlet on the body wall of the cabinet body, a serial communication port, the internal portion of cabinet still is provided with the drainage plate, the drainage plate set up in the cabinet body with between the circuit device, the drainage plate with the cavity that the part body wall of the cabinet body formed is ventilation noise elimination wind channel, the partial structure of drainage plate with the air intake sets up relatively, the drainage plate blocks the noise that the internal portion of cabinet produced directly propagates through the air intake the cabinet is external.

2. The converter according to claim 1, wherein the flow guide plate comprises a shielding portion disposed at the air inlet and a ventilating portion connected to the shielding portion, wherein air outside the cabinet enters the ventilation noise elimination air duct from the air inlet, is guided to the ventilating portion from the shielding portion, enters the cabinet from the ventilating portion, and flows out of the cabinet from the air outlet.

3. The converter according to claim 2, wherein the shielding portion and the ventilation portion are integrally formed plate-like structures, and the ventilation portion is a partial plate-like structure provided with a through hole.

4. The converter according to claim 3, wherein the plate-like structure comprises two plates arranged opposite each other and a cavity between the two plates.

5. The converter according to claim 4, wherein the plate on the side close to the ventilation and noise elimination air duct in the two-layer plates constituting the plate-like structure is a solid plate or a porous plate, and the plate on the side far from the ventilation and noise elimination air duct is a porous plate.

6. The current transformer according to claim 5, wherein the perforated plate has an aperture ratio of 20% to 40%.

7. The converter according to claim 5, wherein the cavity is filled with a sound absorbing material.

8. The converter according to any of claims 2 to 7, wherein the air inlet is located on a side wall of the cabinet and the air outlet is located on a top wall of the cabinet.

9. The converter according to claim 8, wherein the ventilation portion is disposed near a bottom wall of the cabinet, and the through hole faces the air outlet.

10. The converter according to claim 9, wherein a certain distance is kept between the ventilating part and the bottom wall of the cabinet body, so that the wind speed v in the ventilation and noise elimination wind channel is less than or equal to 1 m/s.

11. The converter according to claim 9, characterized in that the ends of the plate-like structure are fixedly connected to the inner wall of said cabinet.

12. The converter according to claim 11, wherein the plate-shaped structure extends from the end portion to the middle portion of the cabinet body and then bends toward the bottom of the cabinet body, and extends toward the bottom of the cabinet body to at least completely shield the air inlet to form the shielding portion, and the plate-shaped structure is a ventilation portion at a position close to the bottom wall of the cabinet body.

13. The current transformer of claim 12, wherein the flow guide plates form a recessed space within the cabinet towards a bottom wall of the cabinet.

14. The converter according to claim 13, characterized in that the shielding portion of said plate-like structure is parallel to the side walls of said tank and the ventilation portion of said plate-like structure is parallel to the bottom wall of said tank.

Technical Field

The invention relates to the field of electrical equipment, in particular to a converter with a ventilation and noise elimination air duct.

Background

A converter is an electrical device that changes the voltage, frequency, number of phases, and other electrical quantities or characteristics of a power supply system. The converter generates a large amount of heat during use, so that heat dissipation is a very important performance index for the converter. Ventilation and heat dissipation are common and used, and the application in the current transformer is very wide, for example, ventilation and heat dissipation are more necessary functions for forced air cooling type current transformers.

One of the important approaches for the research of ventilation and heat dissipation is the design of ventilation and heat dissipation structures, such as the arrangement of ventilation openings for heat dissipation. In the prior art, the converter usually adopts the air inlet shutter as the vent to dissipate heat, but the arrangement has certain problems, and the noise of the reactor, the transformer, the fan and the like in the converter cabinet is easy to spread outwards through the vent and is difficult to control, so that the noise of the converter exceeds the standard. Although the converter can be provided with noise elimination filter cotton and the like for sound absorption and insulation, the air circulation is required to be ensured by ensuring the heat dissipation requirement, so that the converter is difficult to achieve good sound absorption and insulation effects. In addition, the conventional silencer in the prior art is large in size and high in cost, so that the requirement for noise control of a fan, a transformer, a reactor and the like in the converter cannot be met.

Therefore, for the current transformer, especially for the forced air cooling current transformer, how to control the noise while realizing the ventilation effect of the current transformer is an urgent problem to be solved.

Disclosure of Invention

The invention provides a converter with a ventilation and noise elimination air duct, aiming at solving the technical problem that ventilation, heat dissipation and noise control of the converter in the prior art are difficult to realize simultaneously.

The invention provides a current transformer with a ventilation and noise elimination air channel, which comprises a cabinet body and a circuit device, wherein the circuit device is arranged in the cabinet body, an air inlet and an air outlet are arranged on the wall of the cabinet body, a drainage plate is also arranged in the cabinet body and arranged between the cabinet body and the circuit device, a cavity formed by the drainage plate and part of the wall of the cabinet body is the ventilation and noise elimination air channel, part of the structure of the drainage plate is arranged opposite to the air inlet, and the drainage plate prevents noise generated in the cabinet body from being directly transmitted out of the cabinet body through the air inlet.

The arrangement of the ventilation and noise elimination air channel prevents the noise generated inside the converter from being directly transmitted to the outside of the cabinet body on the basis of ensuring the normal ventilation and heat dissipation of the converter, thereby playing a role in eliminating noise and realizing the control on the noise.

In an embodiment of the invention, the flow guide plate includes a shielding portion disposed at the air inlet and a ventilating portion connected to the shielding portion, wherein air outside the cabinet enters the ventilation noise elimination air duct from the air inlet, is guided to the ventilating portion by the shielding portion, enters the cabinet from the ventilating portion, and flows out of the cabinet from the air outlet. The shielding part is matched with the ventilation part, so that the air entering the cabinet body is well guided, and the ventilation and heat dissipation effects are better.

In one embodiment of the present invention, the shielding portion and the ventilation portion are integrally formed plate-like structures, and the ventilation portion is a partial plate-like structure provided with a through hole.

In one embodiment of the invention, the plate-like structure comprises two oppositely arranged plates and a cavity between the two plates.

In one embodiment of the invention, in the two layers of plates constituting the plate-shaped structure, the plate close to the ventilation and noise elimination air channel is a solid plate or a porous plate, and the plate far away from the ventilation and noise elimination air channel is a porous plate. The perforated plate has certain silencing effect, so that the noise can be effectively reduced.

In one embodiment of the present invention, the perforated plate has an aperture ratio of 20% to 40%.

In one embodiment of the invention, the cavity is filled with sound absorbing material. The silencing material is arranged in the cavity of the plate-shaped structure, so that the ventilation effect of the ventilation silencing air channel cannot be influenced while the silencing effect is achieved.

In one embodiment of the present invention, the air inlet is located on a side wall of the cabinet body, and the air outlet is located on a top wall of the cabinet body.

In one embodiment of the invention, the ventilation part is arranged close to the bottom wall of the cabinet body, and the through hole faces the air outlet.

In one embodiment of the invention, a certain distance is kept between the ventilating part and the bottom wall of the cabinet body, so that the wind speed v in the ventilation noise elimination air channel is less than or equal to 1 m/s.

In one embodiment of the invention, the ends of the plate-like structure are fixedly connected to the inner wall of said cabinet.

In an embodiment of the invention, the plate-shaped structure extends from the end part to the middle part of the cabinet body and then bends towards the bottom of the cabinet body, and extends towards the bottom of the cabinet body to at least completely shield the air inlet to form the shielding part, and the plate-shaped structure is a ventilation part at a position close to the bottom wall of the cabinet body.

In one embodiment of the invention, the drainage plate forms a concave space in the cabinet body towards the bottom wall of the cabinet body.

In one embodiment of the invention, the shielding portion of the plate-like structure is parallel to the side wall of the cabinet body, and the ventilation portion of the plate-like structure is parallel to the bottom wall of the cabinet body.

The ventilating part is arranged close to the bottom wall of the cabinet body, so that air can be equalized and uniformly fed into the cabinet, and effective heat dissipation is guaranteed, the ventilating part keeps a certain distance from the bottom wall of the cabinet body, so that the air channel space at the bottom of the cabinet body is large, the wind speed v in the ventilation noise elimination air channel is limited to be less than or equal to 1m/s, a static pressure noise elimination structure is formed at the bottom of the cabinet body, and the noise transmission is also restrained.

Drawings

The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:

FIG. 1 is a schematic cross-sectional view of a converter with a ventilation muffling air duct in an embodiment of the present invention;

fig. 2 is a schematic partial sectional view of a converter with a ventilation muffling air duct according to an embodiment of the present invention.

In the drawings, like parts are provided with like reference numerals. The drawings are not to scale.

Detailed Description

The invention will be further explained with reference to the drawings.

In the present invention, dB (A) represents the noise decibel level under the A-level weighting; c is temperature in degrees Celsius and m/s is speed in meters per second.

Fig. 1 is a schematic cross-sectional structure view of a current transformer with a ventilation and noise elimination air duct in this embodiment, as shown in fig. 1, the current transformer includes a cabinet body 1 and a circuit device disposed inside the cabinet body 1, where the cabinet body 1 includes a body wall 11, an air inlet 111 and an air outlet 112 are disposed on the body wall 11, a flow guide plate 2 is disposed inside the cabinet body 11, and the flow guide plate 2 is disposed between the cabinet body 1 and the circuit device; the cavity that drainage plate 2 and the partial body wall of cabinet 1 formed is ventilation noise elimination wind channel 3, and wherein, partial structure and the air intake 111 of drainage plate 2 are relative setting, and from this, the drainage plate 2 blocks that the noise that cabinet 1 inside produced directly spreads outside the cabinet through air intake 111. The ventilation noise elimination air duct structure in the design prevents noise from being directly transmitted to the outside of the cabinet body on the basis of ensuring ventilation and heat dissipation, and the air duct also has the noise elimination effect, so that the noise of the converter is controlled. Wherein the drainage plate 2 is fixedly connected on the inner wall of the cabinet body 1.

Preferably, the flow guide plate 2 shown in fig. 1 includes a shielding portion 21 disposed at the air inlet 111 and a ventilating portion 22 connected to the shielding portion 21, wherein air outside the cabinet enters the ventilation noise elimination air duct 3 from the air inlet 111, is guided to the ventilating portion 22 by the shielding portion 21, enters the inside of the cabinet by the ventilating portion 22, and flows out of the cabinet by the air outlet 112.

Further, the shielding portion 21 and the ventilation portion 22 are integrally formed into a plate-like structure, and the ventilation portion 22 is a portion of the plate-like structure provided with the through hole 221. Preferably, the plate-like structure comprises two oppositely arranged plates and a cavity between the two plates. Fig. 2 is a schematic partial sectional view of a current transformer with a ventilation and noise elimination air duct according to an embodiment of the present invention, and as shown in fig. 2, of two plates constituting a plate-shaped structure, a first plate layer 23 on a side close to the ventilation and noise elimination air duct is a solid plate, and a second plate layer 24 on a side close to a circuit device (i.e., a side far from the ventilation and noise elimination air duct) is a porous plate. The double-layer plate with the cavity sandwiched in the middle has a better noise reduction effect compared with a single-layer plate, and the second plate layer 24 is a porous plate so that the noise reduction effect is better; further, the first sheet layer 23 may also be a porous plate, so as to further enhance the sound attenuation effect. Preferably, the perforated plate on the side close to the circuit device has an opening rate of 20%, preferably, in one embodiment, the opening rate is 30%, and in some embodiments, the opening rate may be set to 40%. When the first sheet layer 23 near the side of the ventilation noise elimination air duct is a porous plate, the opening rate may also be 20%, preferably, in one embodiment, the opening rate is 30%, and in some embodiments, the opening rate may also be 40%. The first sheet layer 23 and the second sheet layer 24 may have the same or different opening ratios. As shown in fig. 2, a cavity is formed between the first slab layer 23 and the second slab layer 24, and the cavity may be filled with a sound absorbing material 25, and the sound absorbing material 25 may be absorbent cotton; the sound absorption cotton and the perforated plate have better matching silencing effect, and the verified noise reduction can reach 8dB (A).

Preferably, as shown in fig. 1, the air inlet 111 is located on a side wall of the cabinet 1, and the air outlet 112 is located on a top wall of the cabinet. Such a design is mainly obtained based on the internal structure of the converter, which is illustrated in fig. 1, and includes a first circuit device 4 disposed inside the cabinet 1, where the first circuit device 4 may be, for example, a transformer and/or a reactor, and a second circuit device 5 and an air-cooled heat sink 6 are further disposed inside the converter, the second circuit device may be a high-power device, and the air-cooled heat sink 6, where the air-cooled heat sink 6 is located near the air outlet 112, and the air outlet 112 is provided with a fan 7. Wherein the air inlet 111 is of a louver structure. Preferably, the ventilation portion 22 is disposed close to the bottom wall of the cabinet, and the through hole 221 is disposed toward the air outlet 112. The arrangement is such that the air flow direction is as shown by an arrow in fig. 1, the air firstly enters the ventilation noise elimination air duct 3 from the air inlet 111, then reaches the ventilation portion 22 through the drainage of the shielding portion 21, enters the inside of the converter through the through hole 221, passes through the first circuit device 4 and the second circuit device 5, and flows to the outside of the cabinet body from the air outlet 112 under the action of the air-cooled radiator 6 and the fan 7, thereby realizing the air circulation heat dissipation of the converter. Due to the arrangement, air enters the converter from the bottom of the converter through the through holes 221 in the ventilation part 22, so that the air entering the converter can be in contact with devices in the converter more fully, and more effective heat dissipation is realized.

Further, for the ventilation and noise reduction air channel in which the space between the ventilation part 22 and the bottom wall of the cabinet is large, a certain distance needs to be kept between the ventilation part 22 and the bottom wall of the cabinet, specifically, the wind speed v in the ventilation and noise reduction air channel is less than or equal to 1 m/s. Due to the arrangement, the ventilation noise elimination air channel is formed into a static pressure noise elimination structure, air can be equalized and uniformly sent into the cabinet, so that effective heat dissipation is guaranteed, and the transmission of noise is also inhibited. It has been verified that such a structure can reduce the noise by about 15db (a), contributing to heat dissipation such that the temperature can be reduced by about 3 ℃.

Specifically, in this embodiment, as shown in fig. 2, two end portions 211 of the plate-shaped structure of the drainage plate 2 are fixedly connected to the inner wall of the cabinet body 1, the two end portions 211 are respectively connected to the inner wall of the cabinet body 1 on the upper side of the air inlets 111 on the two side walls, the plate-shaped structure extends from the end portion 211 to the middle of the cabinet body and then bends toward the bottom of the cabinet body, and extends toward the bottom of the cabinet body to at least completely shield the air inlets 111 to form a shielding portion 21, the plate-shaped structure is a ventilation portion 22 at a position close to the bottom wall of the cabinet body 1, the ventilation portion 22 is a plate-shaped structure provided with through holes 22, and the ventilation portion can. Wherein the drainage plate 2 forms the recessed space 26 towards the cabinet body diapire in the cabinet body 1, and recessed space 26 is convenient for the setting of converter internal circuit device.

In some embodiments, the cabinet body 1 may have a cubic structure or a cylindrical structure, which is not limited herein; preferably, the shielding portion 21 of the flow guide plate 2 is parallel to the side wall of the cabinet body, and the ventilation portion of the flow guide plate is parallel to the bottom wall of the cabinet body 1.

Other structures inside the converter are clear to those skilled in the art according to the prior art, and therefore, need not be described in detail.

While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.