CN211321200U - Heat radiation structure of low-power plastic shell frequency converter - Google Patents

Abstract

The utility model discloses a heat radiation structure of low-power moulded case converter is divided into two different heat dissipation wind channels to different heating devices. The plastic structural member (1) separates the heat dissipation channel of the main power device from the heat dissipation channel of the power plate (4), and the main power device and the power plate are both cooled by the same fan (8) in an air draft mode. A main heat dissipation air duct consisting of a bus capacitor (3), a radiator (7) of a main power device, a fan (8) and the structural member (1) is arranged below the structural member (1), the bus capacitor (3) directly sweeps across the surface for heat dissipation through cold air, and the main power device takes away heat by transferring the heat to the radiator (7). A power plate (4) is arranged above the structural part (1), and forced convection is formed under the action of a fan (8) through the ventilation hole (2) of the structural part (1) and the heat dissipation hole (9) of the shell (5).

Description

Heat radiation structure of low-power plastic shell frequency converter

Technical Field

The utility model belongs to the technical field of the converter, concretely relates to shell converter's heat radiation structure is moulded to miniwatt.

Background

The frequency converter speed regulation technology is widely applied to speed regulation transmission devices in the industrial field. In the applications, the low-voltage low-power frequency converter generally adopts a plastic shell structure, and because the heat dissipation capability of the plastic shell is not as good as that of a metal shell, and in addition, the frequency converters have the characteristics of small volume, high heat flux density, limited heat dissipation space and the like, heat accumulated in a narrow space of a product is effectively dissipated, and the low-voltage low-power frequency converter has important significance for heat dissipation design analysis and research of the frequency converter.

At present, the heat of the power board and the device of the low-power plastic shell frequency converter on the market is mainly solved through two aspects, so that the area of the PCB is increased, the heat dissipation area is increased through the increased copper sheet, and the other is to blow and dissipate heat of the power board or the device with high heat productivity and the fan with small installation size. Both of these heat dissipation methods have some feet: (1) the structure size of the whole machine is inevitably increased by increasing the area of the PCB, so that the cost and the size of the whole machine are improved; (2) by adding a fan, the cost is also increased.

SUMMERY OF THE UTILITY MODEL

The utility model provides a shell converter's heat radiation structure is moulded to miniwatt has solved main power device and power board heat dissipation problem under the prerequisite that does not increase complete machine size and fan.

According to the utility model discloses an aspect provides a shell converter's heat radiation structure is moulded to miniwatt, including the structure of taking the cavity, and with the structure matches and covers cavity open-ended casing, the cavity lower extreme has the main radiating air duct of constituteing by converter bus-bar capacitance, radiator, fan and structure itself, and converter main power device is located on the radiator base plate, the power board of converter is located the cavity upper end, the ventilation hole has on the structure, the louvre has on the casing, the ventilation hole with air between the louvre is in form the convection current under the fan action.

In the heat dissipation structure of the low-power plastic shell frequency converter, the vent holes are waist-shaped holes.

The heat dissipation structure has two different heat dissipation air channels for different heating devices. The structural member separates the heat dissipation channels of the main power device and the power plate, and the main power device and the power plate both provide cold air in an air draft mode by the same fan. The bus capacitor directly grabs the surface for heat dissipation through cold air, and the main power device takes away heat through transferring the heat to the radiator. The power board is arranged above the structural part, and under the action of the fan, airflow for cooling the power board passes through the ventilation holes of the structural part and the heat dissipation holes of the shell to form forced convection.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Fig. 1 shows an explosion diagram of a heat dissipation structure of a low-power plastic shell frequency converter.

Detailed Description

Fig. 1 shows an explosion diagram of a heat dissipation structure of a low-power plastic shell frequency converter. Referring to fig. 1, the complete frequency converter casing comprises a structural member 1 and a shell 5. The structural member 1 may be made of plastic and has a cavity for mounting a frequency converter device. The housing 5 is mated with the structural member 1 covering the opening of the cavity. And a bus capacitor 3, a radiator 7 and an axial flow fan 8 of the frequency converter are positioned at the lower end of the cavity of the structural member 1. The power board 4 is located at the upper end of the cavity, that is, the power board 4 is located at one side of the bus capacitor 3, the radiator 7 and the axial flow fan 8 and is closer to the shell 5. The frequency converter main power device IGBT is positioned on the radiator 7 substrate. In addition, the structural part 1 itself also serves for heat dissipation. The bus capacitor 3, the heat sink 7, the axial fan 8 and the structural member 1 form a main heat dissipation air duct from left to right. And the main power device IGBT with large heat productivity and the bus capacitor 3 are ensured to be positioned in a main heat radiation air duct of the whole machine.

In order to further meet the heat dissipation requirements of the power board 4 and devices thereon and solve the problem of high temperature of the power board 4, the structural member 1 is further provided with a vent hole 2. The ventilation holes 2 may be waist-shaped. The heat dissipation holes 9 of the shell 5, the power plate 4, the ventilation holes 2 of the structural member 1 and the axial flow fan 8 form a secondary heat dissipation air duct of the whole machine. Under the action of the fan 8, forced convection is formed between the air vents 2 of the structural member 1 and the heat dissipation holes 9 of the housing 5, and the effect of cooling the power plate 4 is achieved. Other board-level devices radiate heat in a natural convection mode through the radiating holes 9 on the shell 5. The utility model discloses heat radiation structure has satisfied the heat dissipation requirement of complete machine main power device and power board 4.

Claims (2)

1. The utility model provides a heat radiation structure of low-power moulded case converter, includes structure (1) of taking the cavity and covers with structure (1) matching cavity open-ended casing (5), its characterized in that, the cavity lower extreme has the main heat dissipation wind channel of constituteing by bus-bar capacitance (3), radiator (7), fan (8) and structure (1) itself, and converter main power device is located radiator (7) base plate, and power board (4) of converter are located cavity upper end has ventilation hole (2) on structure (1), has louvre (9) on casing (5), and the air between ventilation hole (2) and louvre (9) forms the convection current under fan (8) effect.

2. The heat dissipation structure of a low-power molded case frequency converter according to claim 1, wherein the ventilation holes (2) are kidney-shaped holes.

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