CN203261618U - A cooling device for the main control cabinet of a low-temperature wind power generating set - Google Patents

Abstract

The utility model provides a heat dissipation device for a main control cabinet of a low-temperature wind power generating set, in particular to a heat dissipation device for a main control cabinet of a low-temperature wind power generating set. The technical solution includes a cabinet body and a fan. The cabinet body is provided with ventilation holes, and the fan is fixed on the cabinet body. It is characterized in that: the ventilation holes are not less than two, and the two ventilation holes form a 180° diagonal angle. , the fan is arranged above the midpoint of the line between the highest points of the ventilation holes and/or below the midpoint of the line between the lowest points of the ventilation holes. The beneficial effects of the utility model are: due to the adoption of the above technical scheme, the internal ambient temperature of the electric control cabinet is effectively reduced, the heat dissipation area is evenly distributed, and the damage to components is reduced; it has the advantages of simple structure, convenient maintenance, low processing cost, and high heat dissipation efficiency. Advanced merit.

Description

A cooling device for the main control cabinet of a low-temperature wind power generating set

technical field

The utility model relates to a heat exchange device, in particular to a heat dissipation device for a main control cabinet of a low-temperature wind power generating set.

Background technique

In the existing technology, the cooling system in the cabinet usually adopts the form of filter window and filter fan to dissipate the heat of electrical components such as CPU, terminal, PLC, sensor and so on in the cabinet. At first, a single-fan cooling method was adopted: the air vent at the upper end of one side of the cabinet uses a filter window, and the air vent at the lower end of the other side uses a filter fan to dissipate heat. When the filter fan is just started, it can cool down, but soon because the filter device of the filter window limits the speed of the cold air outside the cabinet drifting into the cabinet, even with the function of the filter fan, it is impossible to form a good air circulation. Later, a dual-fan heat dissipation method was proposed: the upper air outlet on one side is provided with a fan, and the lower air inlet on the other side is also provided with a fan. The airflow movement of the dual-fan heat dissipation method is very uneven, so that one part becomes a dead corner, while the other part cools down rapidly, resulting in uneven internal heat exchange, and there are technical problems that may damage the electronic components in the cabinet. Therefore, the heat dissipation method of this dual fan is not ideal.

In the prior art, take the single-fan heat dissipation method of the low-temperature tower base cabinet as an example:

As shown in FIG. 1 , the single-fan heat dissipation method of the prior art is used for heat exchange, and the method of one filter window 2 plus one filter fan 3 is adopted. When the ambient temperature of the tower base cabinet is 243K. When the temperature in the cabinet rose to 303K, the filter fan 3 was started to dissipate heat. Using the traditional single-fan heat dissipation method, the ambient cold air drifts into the cabinet through the filter window, and then is discharged into the environment by the filter fan 3.

As shown in Figure 2, a single-fan cooling method is used for heat exchange. Select temperature sensor (referred to as: sensor), CPU, terminal 123DI1 (referred to as: terminal 1), and terminal 180DO1 (referred to as terminal 2) as representative components. Using ANSYS to analyze the time history curve, the 60s heat dissipation process of four representative components was investigated. Figure 2 shows that when the temperature of the temperature sensor drops to 293K, the temperature of the CPU drops to 299K, the temperature of terminal 1 drops to 302K, and the temperature of terminal 2 drops to 303K. If the heat dissipation is stopped at this time, the PLC is still in a high temperature state; if the heat dissipation is continued, the temperature inside the cabinet will not drop but rise, and the PLC will be in a higher temperature state. This is not conducive to the normal work of the main control system. Therefore, this heat dissipation solution is not desirable.

As shown in Figure 3, use ANSYS to analyze the fluid velocity: the flow direction of the hot air flow and the distribution of the heat dissipation area, which is also one of the reasons for the poor heat dissipation effect.

As shown in Figure 4, use ANSYS to analyze the temperature distribution: the system uses a filter window plus a filter fan 3. The filter cotton at the filter window greatly limits the speed at which the cold air outside the cabinet drifts to the inside of the cabinet. Even with the effect of the filter fan 3, it is impossible to form a good air circulation. Therefore, the heat dissipation effect of heat exchange performed by a single fan heat dissipation method in the cabinet is not good.

In the prior art, take the dual-fan heat dissipation method of the low-temperature tower base cabinet as an example:

In order to make up for the deficiency of the traditional heat dissipation method, a heat dissipation method with dual fans 3 has been proposed.

As shown in FIG. 5 , the air inlet of this heat dissipation method is the filter fan 3 at the lower end, and the air outlet is the filter fan 3 at the upper end. The reason for this is that PLC, battery, UPS and other important components are installed in the upper part of the cabin cabinet, and the lower part of the air intake avoids the damage of low temperature to the performance of these components.

As shown in Figure 6, Figure 7, and Figure 8, the 5s time history curve of representative components is shown in Figure 6. It can be seen from the time history curve that when the temperature at the temperature sensor drops to 293K, the temperature of the PLC has dropped to 264K. Since the PLC cannot work normally when the temperature is below 0°C, this heat dissipation method not only rapidly dissipates heat, but also destroys the working environment of important components such as the PLC. This can be seen in Figures 7 and 8. As shown in Figure 7, the airflow movement is so uneven that one part becomes a dead zone while the other part cools rapidly, which is reflected in Figure 8. When these dead ends are cooled to room temperature, important components such as PLC have dropped to around -10°C. This destroys the performance of the main control system. It can be seen that this solution will also damage components.

Contents of the invention

The problem to be solved by the utility model is to provide an air-cooled heat exchange device with good heat dissipation effect and uniform distribution of heat dissipation areas, which is especially suitable for being installed in a cabinet for air-cooled heat exchange.

In order to solve the above-mentioned technical problems, the technical scheme adopted by the utility model includes a cabinet body and a fan. The cabinet body is provided with ventilation holes, and the fan is fixed on the cabinet body. 180° diagonally, the fan is arranged on the upper part of the midpoint of the line between the highest points of the ventilation holes and/or the lower part of the midpoint of the line between the bottom points of the ventilation holes.

Further, the ventilation holes are arranged on two opposite facades of the cabinet body.

Further, the ventilation holes are arranged on the same horizontal plane or vertical plane.

Further, the ventilation hole is provided with a filter device, and a filter window can be used.

Further, the fan is provided with a filtering device.

The advantages and positive effects of the utility model are: due to the adoption of the above technical scheme, the internal ambient temperature of the electric control cabinet is effectively reduced, the heat dissipation area is evenly distributed, and the damage to components is reduced; the utility model has the advantages of simple structure, convenient maintenance and low processing cost. , High heat dissipation efficiency and so on.

Description of drawings

Fig. 1 is a structural schematic diagram of a single-fan heat dissipation method in the prior art

Figure 2 is a schematic diagram of the 60s time history curve of representative components in the single-fan heat dissipation mode

Figure 3 is a schematic diagram of the fluid velocity vector of the single-fan heat dissipation method

Figure 4 is a schematic diagram of the 60s time temperature distribution of the single fan cooling method

Fig. 5 is a structural schematic diagram of a dual-fan heat dissipation method in the prior art

Figure 6 is a schematic diagram of the 5s time history curve of representative components of the dual-fan heat dissipation method

Figure 7 is a schematic diagram of the fluid velocity vector of the dual-fan heat dissipation method

Figure 8 is a schematic diagram of the 3s time temperature distribution of the dual-fan cooling method

Fig. 9 is the structural representation of the utility model embodiment 1

Fig. 10 is a schematic diagram of the 13s time history curve of the representative components of the utility model embodiment 1

Fig. 11 is a schematic diagram of the fluid velocity vector of the utility model embodiment 1

Fig. 12 is the 13s temperature cloud schematic diagram of the utility model embodiment 1

Fig. 13 is a schematic diagram of the 13s time history curve of the representative components of the utility model embodiment 2

Fig. 14 is a schematic diagram of the fluid velocity vector of the utility model embodiment 2

Fig. 15 is the 13s temperature cloud schematic diagram of embodiment 2 of the present utility model

In the picture:

1. Cabinet body 2. Filter window 3. Filter fan

4. Ventilation hole 5. Fan 6. Filter device

Detailed ways

Embodiment 1, taking the use of this technical solution in the low-temperature tower base cabinet as an example:

As shown in Figure 9, the utility model includes a cabinet body, a fan 5, the cabinet body is provided with ventilation holes 4, the fan 5 is fixed on the cabinet body, the ventilation holes 4 are not less than two, and the two ventilation holes 4 180 ° diagonal between them, the fan 5 is arranged on the upper part of the midpoint of the line between the highest points of the ventilation holes 4 and/or the lower part of the midpoint of the line between the bottommost points of the ventilation holes 4.

Further, the ventilation holes 4 are arranged on two opposite facades of the cabinet body.

Further, the ventilation holes 4 are arranged on the same horizontal plane or vertical plane.

Further, the ventilation hole 4 is provided with a filter device 6, and the filter window 2 can be used.

Further, the fan 5 is provided with a filtering device.

The filter window 2 is located at the upper end of the cabinet body 1 and is symmetrical about left and right. The fan 5 is fixed on the top of the cabinet 1, and the axis of the fan 5 is located on the vertical plane between the midpoints of the top and the sides of the cabinet 1. The air outside the cabinet drifts into the cabinet body 1 through the filter window 2, and under the blowing of the fan 5, heat exchange is performed on the space in the cabinet body 1.

Under the condition that the boundary conditions remain unchanged, the heat dissipation method is simulated based on the ANSYS environment, and the combination of Figure 10, Figure 11, and Figure 12 is obtained.

As shown in Figure 10, the temperature drops steadily, and the downward trend has greater consistency. When the temperature at the temperature sensor drops to 293K, the temperature at the PLC is between 290K and 292K. Therefore, this heat dissipation method provides a good temperature environment for the main control system. The reason for this can be found in the fluid velocity vector diagram and temperature cloud diagram. As shown in Figure 11, the airflow movement is symmetrical and stable, so the temperature in the cabinet drops evenly, as shown in the temperature cloud diagram in Figure 12. Therefore, the heat dissipation method of double filter windows plus a fan in the cabinet is more reasonable.

Embodiment 2, take the use of this technical solution in the cabin cabinet as an example:

As shown in Figure 13, the simulation based on ANSYS software environment shows that the improved heat dissipation method can also be applied to the cabin cabinet. Select temperature sensor (Sensor), terminal 313DI5 (abbreviation: terminal 1), terminal 377DO5 (abbreviation: terminal 2), terminal 389ST6 (abbreviation: terminal 3) as representative components. The temperature drops steadily, and the downward trend has greater consistency. When the temperature at the temperature sensor drops to 293K, the temperature at the PLC is between 287K and 297K. Therefore, this heat dissipation method provides a good temperature environment for the main control system. The reason for this can be found in the fluid velocity vector diagram and temperature cloud diagram.

As shown by the combination of Fig. 14 and Fig. 15, the airflow movement is symmetrical and stable, so the temperature in the cabinet drops evenly. Therefore, the heat dissipation method of double filter windows plus a fan in the cabinet is also suitable for the cabin cabinet.

There are two main performance indicators of the fan in the cabinet, namely: wind speed and air outlet area. As long as these two indicators are met, choose a general fan.

An embodiment of the present utility model has been described in detail above, but the content described is only a preferred embodiment of the present utility model, and cannot be considered as limiting the implementation scope of the present utility model. All equal changes and improvements made according to the application scope of the utility model should still belong to the scope covered by the patent of the utility model.

Claims (5)

1. A cooling device for the main control cabinet of a low-temperature type wind power generating set, comprising a cabinet body and a fan, the cabinet body is provided with ventilation holes, and the fan is fixed on the cabinet body, characterized in that: the ventilation holes are not less than two , 180°diagonal between the two air exchange holes, the fan is arranged on the upper part of the midpoint of the line between the highest points of the air exchange holes and/or the lower part of the midpoint of the line between the lowest points of the air exchange holes. 2. The cooling device for the main control cabinet of a low-temperature wind power generating set according to claim 1, characterized in that: the ventilation holes are arranged on two opposite facades of the cabinet body. 3. The heat dissipation device for the main control cabinet of a low-temperature wind power generating set according to claim 1, wherein the ventilation holes are arranged on the same horizontal plane or vertical plane. 4. The heat dissipation device of the main control cabinet of the low-temperature wind power generating set according to claim 1, characterized in that: the ventilation hole is provided with a filter device. 5. The heat dissipation device of the main control cabinet of a low-temperature wind power generating set according to claim 1, wherein the fan is provided with a filtering device.

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