Low-voltage switchgear assembly with heat dissipation air duct

Abstract

The utility model discloses a low-voltage switchgear assembly with a heat dissipation air duct, which comprises a cabinet body, the top space of the cabinet body is a bus chamber, a vertical device mounting plate is arranged in the space below the bus chamber in the cabinet body and divides the space into a front space and a rear space, the lower part of the front space is a lower ventilation chamber, and the upper part of the rear space is a lower ventilation chamber. An air inlet communicated with the lower ventilation chamber is formed in the operation surface of the cabinet body, a high-power frequency converter with an air duct and a fan is arranged in the front space and located above the lower ventilation chamber, a ventilation opening is formed in the upper end of the device mounting plate, an air duct opening in the lower end of the high-power frequency converter is communicated with the lower ventilation chamber, and an air duct opening in the upper end of the high-power frequency converter is communicated with the ventilation opening; the upper part of the rear space is a hot air chamber, and the upper part of the rear door plate of the cabinet body is provided with a suction opening for exhausting hot air in the hot air chamber out of the cabinet body. The working environment temperature of the high-power frequency converter can be effectively controlled, heat generated by the frequency converter can be effectively dissipated, and reliable and safe working of the high-power frequency converter is promoted.

Description

Technical Field

[0001] This utility model relates to a low-voltage switchgear assembly, and more particularly to a low-voltage switchgear assembly with a heat dissipation duct. Background Technology

[0002] Low-voltage switchgear assemblies are control equipment used in industries such as manufacturing, service sectors, and infrastructure. They are commonly found in high-rise buildings, factory power supply, data centers, subways, and lithium smelting, used for control and protection during power transmission, distribution, and energy conversion. With the increasing use of high-power motors, the integration of frequency converters (VDCs) controlling these motors into groups of low-voltage switchgear assemblies is also becoming more common. Because high-power VDCs generate a lot of heat, without proper internal ventilation design, the operating temperature of the VDC will rise, inevitably affecting its reliable and safe operation and shortening the lifespan of expensive VDC components.

[0003] Therefore, the industry urgently needs to design a cabinet structure with heat dissipation ducts to ensure that the ambient temperature at the inverter assembly work area reaches the standard level and does not affect the electrical life of the inverter. Utility Model Content

[0004] The purpose of this utility model is to provide a low-voltage switchgear with a heat dissipation duct that is simple in structure, low in cost, and can effectively dissipate heat from high-power frequency converters to ensure their reliable and safe operation.

[0005] The purpose of this utility model is achieved through the following technical solution: A low-voltage switchgear with a heat dissipation duct, comprising a cabinet, wherein the top space of the cabinet is a busbar compartment, characterized in that a vertical device mounting plate is provided in the space below the busbar compartment within the cabinet, dividing the space into a front space and a rear space, the lower part of the front space is a lower ventilation chamber, an air inlet communicating with the lower ventilation chamber is provided on the operating surface of the cabinet, a high-power frequency converter with its own air duct and fan is provided in the front space and above the lower ventilation chamber, a ventilation opening is provided at the upper end of the device mounting plate, the lower air duct opening of the high-power frequency converter is connected to the lower ventilation chamber, and the upper air duct opening is connected to the ventilation opening, the upper part of the rear space is a hot air chamber, and an exhaust port for exhausting hot air from the hot air chamber to the cabinet is provided at the upper part of the rear door panel of the cabinet.

[0006] This utility model features air inlets and outlets on the front and rear doors of the cabinet, respectively. A component mounting plate separates the cabinet interior into front and rear spaces, ensuring isolation between the front and rear air chambers and preventing the mixing of hot and cold air. The air duct divides the space into sealed compartments, allowing air to flow effectively and smoothly through the heated components, carrying away heat. The outlet employs a forced draft mode, effectively controlling the operating temperature of the high-power inverter and ensuring that the heat generated by the inverter is effectively dissipated, promoting reliable and safe operation of the high-power inverter.

[0007] The air inlet of this utility model includes a ventilation grille located at the bottom of the cabinet operating surface and a filter sponge window located at the lower part of the front door panel of the cabinet operating surface for receiving cold air from the lower section of the power distribution room.

[0008] This utility model provides a horizontal ventilation duct partition in the lower ventilation chamber, with cold air passages distributed on the ventilation duct partition. The ventilation grille is connected to the space below the ventilation duct partition, and the air filter sponge window is connected to the space between the ventilation duct partition and the lower air duct opening of the high-power frequency converter.

[0009] The present invention provides a vertical hot air chamber partition in the hot air chamber, and hot air passage holes are distributed on the hot air chamber partition.

[0010] This utility model provides an air guide box on the device mounting plate and at the vent for guiding hot air into the hot air chamber. The vent on the device mounting plate is a plurality of heat dissipation holes, and the air inlet of the air guide box is connected to the air duct at the upper end of the high-power frequency converter.

[0011] The upper part of the front space of this utility model is the upper component chamber, and the air guide box is located in the upper component chamber.

[0012] Compared with the prior art, the present invention has the following significant technical effects:

[0013] (1) This utility model sets up a special ventilation channel in the cabinet, and the cold air chamber and the hot air chamber are isolated and sealed to form an air convection channel, which can effectively control the working environment temperature of the high-power frequency converter, ensure that the heat generated by the frequency converter is effectively dissipated, and promote the reliable and safe operation of the high-power frequency converter.

[0014] (2) This utility model rationally divides the internal area of ​​the cabinet, making it easy to assemble the frequency converter, and the components are rationally distributed, conforming to the heat dissipation rules of the components, resulting in good heat dissipation effect.

[0015] (3) This utility model has a simple structure, is easy to manufacture, and is suitable for mass production. Attached Figure Description

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0017] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0018] Figure 2 This is a diagram showing the compartmentalization and airflow direction of this utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the front door panel of the operating system of this utility model;

[0020] Figure 4 This is a structural schematic diagram of the ventilation duct partition of this utility model;

[0021] Figure 5 This is an assembly drawing of the air guide box and component mounting plate of this utility model;

[0022] Figure 6 This is a schematic diagram of the device mounting plate of this utility model;

[0023] Figure 7 This is a schematic diagram of the structure of the hot air chamber partition of this utility model;

[0024] Figure 8 This is a structural schematic diagram of the rear door panel of this utility model.

[0025] In the diagram: 1-Cabinet; 2-Component mounting plate; 3-Lower ventilation chamber; 4-High-power frequency converter; 5-Hot air chamber; 6-Rear door panel; 7-Exhaust vent; 8-Busbar chamber; 9-Front door panel; 10-Filter sponge window; 11-Ventilation duct partition; 12-Cold air vent; 13-Hot air chamber partition; 14-Air guide box; 15-Hot air vent; 16-Heat dissipation hole; 17-Upper component chamber. Detailed Implementation

[0026] like Figures 1 to 8 As shown, this utility model discloses a low-voltage switchgear with a heat dissipation duct, comprising a cabinet 1. The top space of the cabinet 1 is a busbar compartment 8. A vertical device mounting plate 2 is provided in the space below the busbar compartment 8 within the cabinet 1, dividing this space into a front space and a rear space to ensure isolation between the front and rear air chambers and prevent mixing of hot and cold air. The lower part of the front space is a lower ventilation chamber 3. An air inlet communicating with the lower ventilation chamber 3 is provided on the operating surface of the cabinet 1. A high-power frequency converter 4 with its own air duct and fan (the high-power frequency converter 4 with its own air duct and fan is existing technology) is provided in the front space and above the lower ventilation chamber 3. A ventilation opening is provided at the upper end of the device mounting plate 2. The lower air duct opening of the high-power frequency converter 4 is connected to the lower ventilation chamber 3, and the upper air duct opening is connected to the ventilation opening. The upper part of the rear space is a hot air chamber 5. An exhaust port 7 for exhausting hot air from the hot air chamber 5 to the cabinet 1 is provided on the upper part of the rear door panel 6 of the cabinet 1.

[0027] An air guide box 14 is provided on the device mounting plate 2 at the vent to guide hot air into the hot air chamber 5. The vent on the device mounting plate 2 consists of several heat dissipation holes 16. The air inlet of the air guide box 14 is connected to the upper air duct of the high-power frequency converter 4. The upper air duct of the high-power frequency converter 4 is connected to the hot air chamber 5 through the air guide box 14 and the heat dissipation holes 16 on the upper end of the device mounting plate 2. The upper air duct of the high-power frequency converter 4, the air guide box 14, and the heat dissipation holes 16 on the device mounting plate 2 form a closed hot air duct, forcing the heated air to be discharged into the hot air chamber 5 in the designed direction. A vertical hot air chamber partition 13 is installed in the hot air chamber 5. Hot air passage holes 15 are distributed on the hot air chamber partition 13. The hot air chamber partition 13 reduces air turbulence and does not interact with the airflow of the exhaust fan installed on the exhaust outlet rear door plate 6, thus preventing the formation of complex airflow patterns such as vortices and turbulence, and accelerating the extraction of hot air. The exhaust fan has a relatively large force, which can affect the speed of the inverter's built-in fan and cause malfunctions. Therefore, a hot air chamber partition is installed in the hot air chamber to slow down the fluid changes generated by the exhaust fan and prevent it from affecting the inverter's built-in fan. The upper part of the front space is the upper component chamber 17, and the air guide box 14 is located in the upper component chamber 17.

[0028] The air inlet includes a ventilation grille 8 located at the bottom of the operating surface of the cabinet 1 and a filter sponge window 10 located at the bottom of the front door panel 9 of the cabinet operating surface for receiving cold air from the lower section of the power distribution room. The area of ​​the air inlet is calculated to ensure that the area of ​​the air inlet is sufficient to form a cold air flow and ensure that the cold air from the lower section of the power distribution room can enter the equipment.

[0029] A horizontal ventilation duct partition 11 is provided in the lower ventilation chamber 3, which forms a sealed space with the device mounting plate 2 and the front door panel 9 of the operating unit, ensuring that cold air enters from the air inlet and forms an airflow to the duct. Cold air passage holes 12 are distributed on the ventilation duct partition 11. The ventilation grille 8 is connected to the space below the ventilation duct partition 11. The air filter sponge window hole 10 is connected to the space between the ventilation duct partition 11 and the lower air duct opening of the high-power frequency converter 4.

[0030] Within the enclosed space, the cold air from the air inlet is directed into the internal fan of the high-power inverter 4 through the ventilation duct partition 11. Meanwhile, an air guide box 14 is installed at the outlet of the high-power inverter 4 to output the heat generated by the high-power inverter 4 during operation to the hot air chamber 5. The heated air is then drawn away from the cabinet 1 by the exhaust fan installed on the rear door panel 6, forming a heat dissipation duct for air convection.

[0031] The working principle of this utility model is as follows: Cold air A from outside the cabinet enters the lower ventilation chamber 3 through the lower air inlet. Under the separation arrangement of the ventilation duct partition 11, the cold air forms a cold air storage area in the lower ventilation chamber 3. At this time, the high-power frequency converter is working. It has its own air duct and fan. The cold air A enters the inside of the frequency converter and dissipates heat from the heat-generating power components of the frequency converter. The cold air is heated into hot air B. Under the action of the internal fan, an airflow is formed. The upper end of the frequency converter is designed with an air guide box 14. Under the closed condition, the hot air B is introduced into the hot air chamber 5. Under the action of the exhaust fan installed on the rear door panel 6, the hot air is drawn away from the cabinet 1 and discharged to the upper rear side of the cabinet 1, so as to effectively dissipate the heat generated by the frequency converter and promote the reliable and safe operation of the high-power frequency converter.

[0032] This utility model is not limited to the specific embodiments described above. Based on the above content and in accordance with the common technical knowledge and conventional methods in the field, without departing from the basic technical idea of ​​this utility model, other equivalent modifications, substitutions or alterations can be made to this utility model, all of which fall within the protection scope of this utility model.

Claims

1. A low-voltage switchgear assembly with a heat dissipation duct, comprising a cabinet, wherein the top space of the cabinet is a busbar compartment, characterized in that: A vertical device mounting plate is installed in the space below the busbar compartment inside the cabinet, dividing the space into a front space and a rear space. The lower part of the front space is a lower ventilation chamber. An air inlet communicating with the lower ventilation chamber is provided on the operating surface of the cabinet. A high-power frequency converter with its own air duct and fan is installed in the front space and above the lower ventilation chamber. A ventilation opening is provided at the upper end of the device mounting plate. The lower air duct opening of the high-power frequency converter is connected to the lower ventilation chamber, and the upper air duct opening is connected to the ventilation opening. The upper part of the rear space is a hot air chamber. An exhaust port for exhausting hot air from the hot air chamber to the cabinet is provided on the upper part of the rear door panel of the cabinet.

2. The low-voltage switchgear with heat dissipation duct according to claim 1, characterized in that: The air inlet includes a ventilation grille located at the bottom of the cabinet's operating surface and a filter sponge window located at the lower part of the front door panel of the cabinet's operating surface for receiving cold air from the lower section of the power distribution room.

3. The low-voltage switchgear with heat dissipation duct according to claim 2, characterized in that: A horizontal ventilation duct partition is provided in the lower ventilation chamber, and cold air passages are distributed on the ventilation duct partition. The ventilation grille is connected to the space below the ventilation duct partition, and the air filter sponge window is connected to the space between the ventilation duct partition and the lower air duct opening of the high-power frequency converter.

4. The low-voltage switchgear with heat dissipation duct according to claim 3, characterized in that: The hot air chamber is provided with a vertical hot air chamber partition, and hot air passages are distributed on the hot air chamber partition.

5. The low-voltage switchgear with heat dissipation duct according to claim 4, characterized in that: An air guide box for guiding hot air into the hot air chamber is provided on the device mounting plate and at the vent. The vent on the device mounting plate consists of several heat dissipation holes. The air inlet of the air guide box is connected to the air duct at the top of the high-power frequency converter.

6. The low-voltage switchgear with heat dissipation duct according to claim 5, characterized in that: The upper part of the front space is the upper component room, and the air guide box is located in the upper component room.

Images