CN203608505U - Outdoor cabinet heat dissipation system based on low-power centrifugal fans - Google Patents

Abstract

The utility model relates to an outdoor cabinet heat dissipation system based on a small-power centrifugal fan, which comprises a cabinet in which several groups of centrifugal fans are arranged, and baffles are arranged at the air vents of the centrifugal fans. Preferably, the top cover of the cabinet is a double-layer shell structure, including an inner layer top plate and an outer layer top cover, the centrifugal fan is fixed on the inner layer top plate, and the air outlet of the centrifugal fan is located on the inner layer Between the top plate and the outer canopy. The outdoor cabinet heat dissipation system based on the small-power centrifugal fan of the utility model is easy to install, has excellent heat dissipation performance, low cost, and reliable operation, solves the problem of insufficient heat dissipation in the current outdoor cabinet axial flow fan air cooling system, and avoids air conditioners, heat sinks, etc. The switching system is complicated to install and has the disadvantages of high cost.

Description

An Outdoor Cabinet Cooling System Based on Small Power Centrifugal Fan

technical field

The utility model belongs to the technical field of heat dissipation of distribution boxes, in particular to an outdoor cabinet heat dissipation system based on a small-power centrifugal fan.

Background technique

Power outdoor cabinets are mainly suitable for the installation and protection of outdoor local control and protection devices. With the rapid development of social economy, the society's demand for electricity is increasing, and outdoor cabinets have become ubiquitous, such as roadsides, parks, buildings, etc. top, community, school, etc. At present, there are mainly three heat dissipation methods for outdoor cabinets:

1. Axial fan forced air cooling

Axial flow fans are used for air extraction to realize the convection of air inside and outside the cabinet, exhaust the indoor air to the outside, and at the same time discharge the outdoor air into the room to realize the transfer of heat in the cabinet. The axial flow fan has simple structure, small size, convenient installation, low energy consumption and low cost. The disadvantages of this heat dissipation method are: small air volume and wind pressure, poor heat dissipation effect, and cannot undertake the heavy task of cooling the cabinet for a long time; as time goes by, it is easy to accumulate dust and other dirt, and make it pollute the components in the cabinet, and then The heat island effect is exacerbated, and the reliability and stability are low.

2. Air conditioning cooling

The cabinet air conditioner is composed of compressors, condensers, thermostats, capillary tubes, evaporators, fans and other main components. The external unit compresses the refrigerant through the compressor, condenses and releases heat, and the internal unit evaporates the liquid refrigerant to absorb heat to reduce the ambient temperature in the cabinet. When installed on the control cabinet, the heat in the cabinet and Water vapor is transferred to the outside of the cabinet.

The air conditioner has an excellent heat dissipation effect, which can keep the temperature and humidity inside the cabinet constant; the airtight heat dissipation can effectively prevent external dust and water vapor from entering the cabinet, and the protection level is high. However, the disadvantages of this heat dissipation method are: the air conditioner is bulky and difficult to install and maintain; the energy consumption is high, which does not meet the current general policy of "energy saving and emission reduction"; and the cost is the highest.

3. Heat exchanger

The heat exchanger device uses the air outside the cabinet which is lower than the temperature inside the cabinet to perform effective heat exchange through the heat exchange core. The internal and external circulating air passes through the heat exchanger independently to exchange heat. Temperature adjustment. The cost and heat dissipation effect of the heat exchanger are between the above two. The advantages of this heat dissipation method are: airtight heat dissipation, which can effectively prevent external dust and water vapor from entering the cabinet, and has a high protection level; the high-efficiency parallel flow heat exchange core has excellent heat exchange efficiency and high energy efficiency; it is designed for continuous operation day and night , strong adaptability, stable and reliable work. But its disadvantages are: the heat exchange must meet the temperature outside the cabinet is lower than inside the cabinet, it is only suitable for some areas with low ambient temperature all the year round; the volume is large, it is inconvenient to install; the cost is high.

To sum up, the forced air cooling of the axial flow fan has low cost and low energy consumption, but the heat dissipation effect is poor; the air conditioner has an excellent heat dissipation effect, but it is the most expensive and consumes the most power; big.

Utility model content

The purpose of this utility model is to provide an outdoor cabinet heat dissipation system based on a small-power centrifugal fan for the above-mentioned deficiencies in the prior art.

In order to achieve the above object, the technical scheme adopted by the utility model is as follows.

An outdoor cabinet heat dissipation system based on a small-power centrifugal fan includes a cabinet in which several groups of centrifugal fans are arranged, and baffles are arranged at the vents of the centrifugal fans.

Further, the top cover of the cabinet is a double-layer shell structure, including an inner layer top plate and an outer layer top cover, the centrifugal fan is fixed on the inner layer top plate, and the air outlet of the centrifugal fan is located on the inner layer Between the top plate and the outer canopy.

Further, the centrifugal fan is installed on the sheet metal, and the sheet metal is provided with a punching hole matched with the air inlet of the centrifugal fan, and a filter screen is provided around the sheet metal, and the sheet metal, the centrifugal fan and the filter The mesh forms a fan module, the inner top plate is provided with a square hole matched with the fan module, and the fan module is installed on the inner top plate through a sheet metal.

Further, the sheet metal is connected to the inner top plate by bolts.

Further, the centrifugal fan is a centrifugal fan without volute.

Further, the airflow direction of the air outlet of the centrifugal fan without volute is radial.

Further, the number of the volute-less centrifugal fans is two.

The beneficial effects of the utility model are: the outdoor cabinet heat dissipation system based on the small-power centrifugal fan of the utility model is easy to install, has excellent heat dissipation performance, low cost, and reliable operation, and solves the problem of insufficient heat dissipation of the current outdoor cabinet axial flow fan air cooling system. It avoids the disadvantages of complex installation and high cost of air conditioning and heat exchange systems, and is an economical, applicable, stable and reliable heat dissipation method with high cost performance.

Description of drawings

Fig. 1 is a structural schematic diagram of a centrifugal fan without a volute of the outdoor cabinet heat dissipation system based on a small-power centrifugal fan of the present invention.

Fig. 2 is a schematic diagram of the composition of the centrifugal fan module of the outdoor cabinet heat dissipation system based on the small-power centrifugal fan of the present invention.

Fig. 3 is a schematic diagram of cooperation between the centrifugal fan module and the inner bottom plate of the present invention.

Fig. 4 is a schematic diagram of the installation of the centrifugal fan module of the present invention.

Fig. 5 is a schematic diagram of heat dissipation flow of the present invention.

In the figure, 1-centrifugal fan, 11-motor, 12-blade, 13-blade front cover, 14-blade rear cover, 2-sheet metal, 3-filter, 41-inner top plate, 411-square hole , 42-outer top cover, 5-cabinet, 6-bolt, 7-collector, 8-baffle, F-airflow direction.

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

The cooling system of the outdoor cabinet based on the centrifugal fan of the utility model replaces the axial flow fan with a centrifugal fan with better performance without changing the layout of the internal devices of the outdoor cabinet. According to the heat production of the electronic devices in the cabinet, the parameters of the required fan can be calculated, and then the appropriate fan can be selected. The preferred impeller of the utility model is directly installed on the motor without volute centrifugal fan, as shown in Figure 1, it is mainly composed of motor 11, blade 12, blade front cover plate 13, blade rear cover plate 14 composition. A volute-less centrifugal fan is used, and the radial direction of the entire impeller is an air outlet.

The installation method of the volute-less centrifugal fan will be described below with reference to Figures 2-4.

The two centrifugal fans 1 are mounted on the same sheet metal 2, and the sheet metal 2 is provided with a punching hole matching the air inlet of the centrifugal fan 1, and the filter screen 3 is installed around the sheet metal 2, and the centrifugal fan 1, sheet metal 2 and The filter screen 3 forms a fan module, as shown in FIG. 2 . The sheet metal 2 can be designed into a concave shape in the middle according to the height dimension of the centrifugal fan 1 . Centrifugal fans are usually equipped with a collector at the air inlet to facilitate the flow of air in the cabinet.

Figure 3 is a schematic diagram of the cooperation between the centrifugal fan module and the inner bottom plate, and Figure 4 is a schematic diagram of the installation of the centrifugal fan module. Layer top cover 42, the outer layer top cover is equipped with a circle of baffles, which can reduce external dust and water vapor from entering the inside of the cabinet. The inner roof 41 is provided with a square hole 411 matched with the fan module. The centrifugal fan module is located between the inner roof 41 and the outer top cover 42 and is fixed on the inner roof 41 with bolts, and is positioned on the inner roof 41. Central location. The centrifugal fan module is installed on the inner layer top plate 41 from below and is connected with bolts, so that the maintenance and overhaul of the centrifugal fan 1 are convenient, and the dust and dirt of the filter screen can be cleaned regularly. The volute-less centrifugal fan 1 can be installed with a vertical shaft, and the airflow direction of the air outlet is radial, so it is parallel to the top plate, and the air path damping is small.

The air flow of the heat dissipation system is shown in Figure 5. The external air enters the cabinet from the filter at the bottom of the cabinet and the bottom of the side panel, then flows through the middle of the cabinet and exchanges heat with the heating device in the cabinet, and then reaches the air inlet of the centrifugal fan 1. The centrifugal fan 1 The air inlet is equipped with a collector 7, and the centrifugal fan 1 changes the airflow direction F and throws it radially. Since the centrifugal fan 1 is located between the inner top plate 41 and the outer top cover 42, the centrifugal fan 1 is fixed inside by bolts 6 On the roof, the air-flow finally enters the external environment through the gap between the filter screen 3 of the centrifugal fan, the inner roof 41 and the outer roof 42, the air outlet around the baffle plate 8 and the outer roof 42.

Compared with the prior art, the outdoor cabinet cooling system based on the low-power centrifugal fan of the utility model has the following advantages.

Compared with method 1:

First, the utility model is basically the same as the mode 1 in structure, so it also has the same advantages as the mode 1, simple in structure, small in size, easy to install and maintain.

Second, while the utility model has the advantages of mode 1, it also overcomes the biggest weakness of mode 1, and has strong air volume and wind pressure. Under the condition of the same size, the air volume and wind pressure of the centrifugal sub-machine are much larger than those of the axial flow fan.

Third, due to the high protection requirements of the outdoor cabinet, the air outlet of the skylight is generally not used to dissipate heat, but the double-layer shell structure is used to dissipate heat from the side vents of the top cover. In this form, the radial exhaust characteristics of the centrifugal fan make it The wind path resistance is smaller and the efficiency is higher.

Compared with method 2:

The air conditioner is large in size, complex in structure, takes up a lot of space, and is expensive. It is necessary to use it unless the equipment in the cabinet has particularly high environmental requirements.

Compare with method 3:

The heat exchanger is still convective heat transfer in essence. The inevitable result of convective heat transfer is that the temperature inside the cabinet must be higher than the ambient temperature. Therefore, the heat dissipation effects of the two are not much different.

The only advantage of heat exchange is airtight heat dissipation, so it has a higher protection level. And the cooling system designed by the utility model, air inlet, air outlet all have protection filter screen, also be provided with waterproof, dustproof baffle on the top of the cabinet in addition, can reach IP56 protection level, can adapt to various severe environments.

In addition, the cost of the heat exchanger is much higher than that of the centrifugal fan, and there are disadvantages such as large volume and difficult installation.

The above descriptions are only preferred embodiments of the present utility model, and are not used to limit the implementation scope of the present utility model; if the utility model is modified or equivalently replaced without departing from the spirit and scope of the present utility model, all should be covered by this utility model. within the protection scope of utility model claims.

Claims (7)

1. An outdoor cabinet heat dissipation system based on a low-power centrifugal fan, comprising a cabinet, characterized in that several groups of centrifugal fans are arranged in the cabinet, and baffles are provided at the vents of the centrifugal fans. 2. The outdoor cabinet heat dissipation system based on a small-power centrifugal fan according to claim 1, wherein the top cover of the cabinet is a double-layer shell structure, including an inner top plate and an outer top cover, and the centrifugal The fan is fixed on the inner roof, and the air outlet of the centrifugal fan is located between the inner roof and the outer roof. 3. The cooling system for outdoor cabinets based on a low-power centrifugal fan according to claim 2, wherein the centrifugal fan is installed on a sheet metal, and the sheet metal is provided with an air inlet that matches the centrifugal fan. Punching holes, filter screens are arranged around the sheet metal, the sheet metal, centrifugal fan and filter screen form a fan module, the inner top plate is provided with a square hole matching the fan module, the fan module Installed on the inner top plate by sheet metal. 4. The outdoor cabinet heat dissipation system based on a low-power centrifugal fan according to claim 3, wherein the sheet metal is connected to the inner top plate by bolts. 5. The cooling system for an outdoor cabinet based on a low-power centrifugal fan according to any one of claims 1-4, wherein the centrifugal fan is a centrifugal fan without a volute. 6 . The cooling system for outdoor cabinets based on a low-power centrifugal fan according to claim 5 , wherein the airflow direction of the air outlet of the non-volute centrifugal fan is radial. 7 . 7. The cooling system for outdoor cabinets based on a low-power centrifugal fan according to claim 6, wherein the number of said centrifugal fans without volute is two.

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