A frequency conversion cabinet

Abstract

The utility model discloses a frequency conversion cabinet, including the cabinet body, the cabinet body contains the seal chamber and the air inlet chamber of upper and lower settings, and the frequency converter and controller are located in the seal chamber, and the heat dissipation fan of electric connection with control device is located in the air inlet chamber, the side of air inlet chamber is equipped with first air inlet, and is equipped with first filter device at first air inlet, the bottom of seal chamber is equipped with the second air inlet with air inlet chamber intercommunication, and is equipped with second filter device at second air inlet, and the side top of seal chamber is equipped with the exhaust port opposite with first air inlet, the frequency conversion cabinet disclosed in this application, the air inlet chamber sets up below the seal chamber, can form the vertical airflow path of lower in and out, effectively avoids the cold and hot air mixing, and the heat exchange efficiency of frequency conversion cabinet is greatly promoted, in addition, sets up two filter devices and realizes the double filtration function to intercept big granule and tiny dust respectively, ensures that the air clean of entering frequency converter, avoids the dust cover fin and leads to the thermal resistance increase, prolongs the service life of frequency converter.

Description

Technical Field

[0001] This utility model relates to the field of control cabinet technology, and in particular to a frequency converter cabinet. Background Technology

[0002] In traditional inverter cabinet designs, there is often a lack of independent heat dissipation channels. This causes hot air and cold air to mix inside the cabinet, resulting in airflow short-circuiting. This airflow short-circuiting not only reduces the heat dissipation efficiency of the inverter cabinet, but also, under high load operation, the inverter is prone to overheating and triggering protection shutdown because hot air cannot be effectively discharged, thus affecting the operational stability and reliability of the entire system.

[0003] It is evident that existing technologies still need improvement and enhancement. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a frequency converter cabinet in which the air inlet chamber is located below the sealed chamber, forming a vertical airflow path to improve heat exchange efficiency; at the same time, two filter devices ensure double filtration to prevent the heat sink from being covered by dust, which would increase thermal resistance.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A frequency converter cabinet includes a cabinet body, an air intake chamber and a sealed chamber disposed within the cabinet body, the air intake chamber being located below the sealed chamber, a frequency converter and a controller disposed within the sealed chamber, and a cooling fan electrically connected to the controller disposed within the air intake chamber; a first air inlet is provided on the side of the air intake chamber, and a first filter device is disposed at the first air inlet; a second air inlet communicating with the air intake chamber is provided at the bottom of the sealed chamber, and a second filter device is disposed at the second air inlet; an exhaust port is provided on the top of one side of the sealed chamber, and the first air inlet and the exhaust port are disposed opposite to each other.

[0006] In the aforementioned frequency converter cabinet, a heat dissipation channel is also provided in the sealed chamber. The air inlet side of the heat dissipation channel is connected to the second air inlet, and the air outlet side of the heat dissipation channel faces the heat-generating element of the frequency converter.

[0007] In the aforementioned frequency converter cabinet, a temperature sensor electrically connected to the controller is also installed in the sealed chamber. The temperature sensor is used to obtain the real-time operating temperature of the frequency converter.

[0008] The frequency converter cabinet also includes a dust removal mechanism electrically connected to the controller, which is used to perform periodic cleaning of the second filter device.

[0009] In the aforementioned frequency converter cabinet, the dust removal mechanism includes a dust removal chamber, a dust collection bag, and a dust removal fan disposed within the dust removal chamber. The dust removal fan is electrically connected to the controller. A small-diameter suction port is provided at the bottom of one side of the dust removal chamber. The dust collection bag is disposed at the bottom of the dust removal chamber and located below the small-diameter suction port. The dust removal fan is used to create a negative pressure difference between the dust removal chamber and the air inlet chamber.

[0010] In the aforementioned frequency converter cabinet, the dust removal mechanism further includes a differential pressure gauge electrically connected to the controller, which is used to measure the pressure difference between the air inlet side and the air outlet side of the second filter device.

[0011] In the aforementioned frequency converter cabinet, a switching valve electrically connected to the controller is installed in the heat dissipation channel, and the second filter device is inclinedly installed at the second air inlet.

[0012] In the aforementioned frequency converter cabinet, a first waterproof cover is provided on one side of the cabinet body, and the first waterproof cover is located on the air intake side of the first air inlet; a second waterproof cover is provided on the other side of the cabinet body, and the second waterproof cover is located on the air exhaust side of the exhaust port.

[0013] In the aforementioned frequency converter cabinet, the first waterproof cover and the second waterproof cover are louvered waterproof covers, used to prevent water vapor or rainwater from directly penetrating the interior of the cabinet.

[0014] Beneficial effects: This utility model provides a frequency converter cabinet. By placing the air inlet chamber below the sealed chamber and opening an exhaust port on the top side of the sealed chamber, a vertical airflow path of bottom inlet and top outlet is formed inside the cabinet. This avoids the mixing of hot and cold air and significantly improves the heat exchange efficiency inside the frequency converter cabinet. In addition, dual filtration is achieved through a first filter device and a second filter device to intercept large particles and fine dust in the air respectively, ensuring that the air entering the frequency converter is clean and preventing dust from covering the heat sink, which would increase thermal resistance and effectively extend the service life of the frequency converter. Attached Figure Description

[0015] Figure 1 This is a structural schematic diagram of the frequency converter cabinet provided by this utility model.

[0016] Explanation of main component symbols: 1-cabinet, 11-air inlet chamber, 12-sealed chamber, 13-first air inlet, 14-exhaust port, 15-heat dissipation channel, 16-second air inlet, 2-frequency converter, 3-controller, 41-dust removal chamber, 42-dust collection bag, 43-dust removal fan, 5-first waterproof cover, 6-second waterproof cover. Detailed Implementation

[0017] This utility model provides a frequency converter cabinet. To make the purpose, technical solution and effect of this utility model clearer and more explicit, the following describes this utility model in further detail with reference to the accompanying drawings and embodiments.

[0018] In the description of this utility model, it should be understood that the terms "top", "bottom", "upper", "lower", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and should not be construed as limiting this utility model; in addition, the terms "installation", "connection", etc. should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0019] Please see Figure 1 This utility model provides a frequency converter cabinet, including a cabinet body 1. The cabinet body 1 is provided with an air intake chamber 11 and a sealing chamber 12. The air intake chamber 11 is located below the sealing chamber 12. The sealing chamber 12 is provided with a frequency converter 2 and a controller 3. The air intake chamber 11 is provided with a cooling fan electrically connected to the controller 3. The side of the air intake chamber 11 is provided with a first air inlet 13, and a first filter device is provided at the first air inlet 13. The bottom of the sealing chamber 12 is provided with a second air inlet 16 communicating with the air intake chamber 11. The second air inlet 16 is provided with a second filter device. The top of one side of the sealing chamber 12 is provided with an exhaust port 14. The first air inlet 13 and the exhaust port 14 are arranged opposite to each other.

[0020] This application discloses a frequency converter cabinet. By placing the air inlet chamber 11 below the sealed chamber 12 and opening an exhaust port 14 on the top side of the sealed chamber 12, a vertical airflow path of bottom inlet and top outlet is formed inside the cabinet 1. This avoids the mixing of hot and cold air and significantly improves the heat exchange efficiency inside the frequency converter cabinet. In addition, dual filtration is achieved through a first filter and a second filter. The first filter is a pre-filter used to filter larger dust particles in the air to prevent large particles from clogging the subsequent precision filter. The second filter is a secondary filter used to further filter fine dust. With the cooperation of the two filter devices, the air entering the frequency converter 2 is ensured to be clean, avoiding dust covering the heat sink and increasing thermal resistance, effectively extending the service life of the frequency converter 2, and preventing dust accumulation from affecting the heat exchange efficiency.

[0021] In this embodiment, please refer to Figure 1The blue arrows indicate the path of cold air entering the cabinet 1. External cold air first undergoes primary filtration through the first air filter at the first air inlet 13. After primary filtration, the cold air enters the independently sealed air inlet chamber 11, forming a stable airflow buffer zone to prevent external airflow disturbances from affecting the filtration effect. The buffered cold air undergoes secondary filtration through the second filter under the action of the cooling fan. Finally, the clean cold air is blown directly onto the heat-generating elements of the inverter 2, such as the IGBT module, through the heat dissipation channel 15, absorbing heat through heat exchange to reduce the operating temperature of the inverter 2. The air outlet of the cooling fan faces the inverter 2, and the forced airflow pushes the cold air to flow sequentially through the first filter, air inlet chamber 11, second filter, and inverter 2, forming a stable heat dissipation airflow path.

[0022] Further, please refer to Figure 1 The red arrow indicates the hot air exhaust path. The hot air, after exchanging heat with the inverter 2, is exhausted through the exhaust port 14 on the top side of the cabinet 1 using the internal thermal pressure effect, forming an independent heat dissipation channel 15 with bottom inlet and top outlet, avoiding mixing with cold air and improving heat dissipation efficiency. Furthermore, the continuous air supply power of the cooling fan and the airflow control of the exhaust port 14 maintain a slight positive pressure inside the cabinet 1. Specifically, because the cooling fan continuously supplies air into the cabinet, while the airflow discharge speed of the exhaust port 14 is relatively stable, the amount of air inside the cabinet is slightly greater than the amount discharged, thus forming a slight positive pressure. This positive pressure state can prevent external dust, moisture and other pollutants from flowing back into the cabinet 1 through the gaps, keeping the inside of the cabinet 1 in a relatively sealed state, further ensuring protective performance.

[0023] Furthermore, a heat dissipation channel 15 is also provided in the sealed chamber 12. The air inlet side of the heat dissipation channel 15 is connected to the second air inlet 16, and the air outlet side of the heat dissipation channel 15 faces the heat-generating element of the frequency converter 2.

[0024] In this embodiment, an independent heat dissipation duct is provided inside the sealed chamber 12, allowing cold air to flow through the heat dissipation duct to directionally flush the heating element, effectively improving heat exchange efficiency and shortening cooling time; hot air is discharged through the top exhaust port 14, forming a direct ventilation path, avoiding disorderly airflow within the sealed chamber 12, reducing energy loss, and ensuring stable heat dissipation efficiency; and it can also isolate the electrical components of the controller 3 from the heat dissipation channel 15, improving the anti-interference capability of the controller 3.

[0025] Furthermore, a temperature sensor electrically connected to the controller 3 is also provided in the sealed chamber 12, and the temperature sensor is used to obtain the real-time operating temperature of the frequency converter 2.

[0026] In this embodiment, the temperature sensor directly collects the surface or internal temperature of the inverter 2 and transmits the real-time temperature signal to the controller 3. When the real-time temperature exceeds the preset temperature threshold, such as 40°C, the controller 3 starts the cooling fan to prevent the inverter 2 from being triggered to stop due to overheating, thereby extending the equipment life and improving the continuous operation capability of the inverter cabinet. When the real-time temperature decreases, the controller 3 automatically adjusts the fan speed or stops the fan to avoid the cooling fan from running continuously without load and reduce energy consumption under non-full load conditions.

[0027] Furthermore, the frequency converter cabinet also includes a dust removal mechanism electrically connected to the controller 3, which is used to perform periodic cleaning of the second filter device.

[0028] In this embodiment, a cleaning cycle can be preset in the controller 3, such as starting the dust removal mechanism every 48 hours to clean the second filter device, reducing downtime and manual intervention, and lowering labor costs. The dust removal mechanism removes dust from the filter screen through airflow, i.e., through non-mechanical contact, which avoids downtime losses caused by manual disassembly. By periodically cleaning the second filter device, the air permeability of the filter screen of the second filter device is stabilized, avoiding a decrease in heat dissipation efficiency due to dust accumulation.

[0029] Furthermore, the dust removal mechanism includes a dust removal chamber 41, a dust collection bag 42 and a dust removal fan 43 disposed within the dust removal chamber 41, and the dust removal fan 43 is electrically connected to the controller 3; a small-diameter suction port is provided at the bottom of one side of the dust removal chamber 41, and the dust collection bag 42 is disposed at the bottom of the dust removal chamber 41 and located below the small-diameter suction port; the dust removal fan 43 is used to create a negative pressure difference between the dust removal chamber 41 and the air inlet chamber 11.

[0030] In this embodiment, please refer to Figure 1The yellow arrows indicate the dust flow direction during the self-cleaning process. When cleaning of the second filter is required, controller 3 shuts off the cooling fan and starts the dust removal fan 43. The dust removal fan 43 is located inside the dust removal chamber 41. After starting, it draws air outward, creating a negative pressure difference between the sealed chamber 12 and the inlet chamber 11. The air drawn from the dust removal chamber 41 by the dust removal fan 43 is forced to be drawn into the dust removal chamber 41 from the small-diameter suction port on the side of the inlet chamber 11, forming a transverse airflow from the inlet chamber 11 to the dust removal chamber 41. When this transverse airflow passes through the second filter, its direction is the same as the normal... The heat dissipation direction is vertical or diagonally intersecting, impacting the dust accumulated on the surface of the second filter device to break the adhesion between the dust and the second filter device. The detached dust moves towards the dust removal chamber 41 under the airflow. Since the dust removal chamber 41 is located on the side of the air inlet chamber 11, after the dust enters the dust removal chamber 41 with the airflow, it falls into the dust collection bag 42 at the bottom under the action of gravity due to the reduced flow velocity or change of direction. By setting a small-diameter suction port, a high-speed airflow is formed, which enhances the dust suction effect. In addition, by setting the dust collection bag 42 below the suction port, the dust does not fly away again, which can maintain the cleanliness of the inside of the cabinet 1.

[0031] Furthermore, the dust removal mechanism also includes a differential pressure gauge electrically connected to the controller 3, which is used to measure the pressure difference between the air inlet side and the air outlet side of the second filter device.

[0032] In this embodiment, the differential pressure gauge is used to measure the air pressure difference between the air inlet and outlet sides of the second filter device. When the real-time air pressure difference exceeds the set differential pressure threshold, such as 200Pa, it is determined that the filter screen of the second filter device is clogged. The controller 3 controls the dust removal fan 43 to turn on and the cooling fan to turn off, so as to perform the cleaning work of the second filter device. Through differential pressure blockage triggering, cleaning can be started according to the actual dust accumulation, avoiding ineffective operation when the filter screen is not clogged, and filter screen damage or abnormal airflow can be detected in advance, which is convenient for predictive maintenance. Furthermore, by combining differential pressure blockage and periodic maintenance, over- or under-cleaning caused by relying solely on timed cleaning is avoided.

[0033] Furthermore, a switching valve electrically connected to the controller 3 is provided in the heat dissipation channel 15, and the second filter device is inclinedly disposed at the second air inlet 16.

[0034] In this embodiment, by setting a switching valve in the heat dissipation channel 15, the controller 3 simultaneously closes the switching valve when the second filter device is removing dust, cutting off the airflow channel between the air inlet chamber 11 and the sealing chamber 12, preventing dust carried by the reverse airflow from entering the inverter 2 area, and improving protection reliability; furthermore, the second filter device is inclined at 30°-45° to the horizontal plane, and the dust is more likely to slide down the filter screen surface of the second filter device to the small-diameter suction port of the dust removal chamber 41 under the blowing of the reverse airflow, shortening the dust removal time, and reducing the amount of dust remaining on the filter screen surface of the second filter device, improving the dust removal effect and the capacity utilization rate of the dust collection bag 42.

[0035] Furthermore, a first waterproof cover 5 is provided on one side of the cabinet 1, and the first waterproof cover 5 is located on the air intake side of the first air inlet 13; a second waterproof cover 6 is provided on the other side of the cabinet 1, and the second waterproof cover 6 is located on the air exhaust side of the exhaust port 14.

[0036] Furthermore, the first waterproof cover 5 and the second waterproof cover 6 are louvered waterproof covers to prevent water vapor or rainwater from directly penetrating the interior of the cabinet 1; In this embodiment, the first waterproof cover 5 located on the air inlet side of the first air inlet 13 and the second waterproof cover 6 located on the air outlet side of the exhaust port 14 adopt a louver structure. By tilting the louvers at 45°, vertical intrusion of rainwater can be effectively prevented, while allowing oblique airflow. That is, the louver-type waterproof cover blocks water droplets without significantly increasing wind resistance, thus meeting the requirements for protection against water jets. Therefore, the frequency converter cabinet of this application can meet the IP55 protection standard and can operate stably outdoors or in high humidity environments.

[0037] In this embodiment, the controller 3 is an existing microprocessor. It should be noted that the controller 3 in this application does not involve any new algorithms, but only adopts the basic logic of threshold comparison and timed loop, which are mature control strategies in the prior art. Furthermore, the connection methods of the controller 3 with the temperature sensor, differential pressure gauge, cooling fan and dust removal fan are all industrial control standard interfaces, without any special hardware innovation. Moreover, the functional modules such as temperature control, differential pressure monitoring and timed tasks are all standard functions of existing controllers, which can be directly reused through modular programming without the need for custom development.

[0038] It is understood that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of this utility model, and all such substitutions or changes should fall within the protection scope of this utility model.

Claims

1. A variable frequency cabinet comprising a cabinet body, characterized in that, The cabinet contains an air intake chamber and a sealed chamber. The air intake chamber is located below the sealed chamber. The sealed chamber contains a frequency converter and a controller. The air intake chamber contains a cooling fan electrically connected to the controller. A first air inlet is provided on the side of the air intake chamber, and a first filter is provided at the first air inlet. A second air inlet, communicating with the air intake chamber, is provided at the bottom of the sealed chamber, and a second filter is provided at the second air inlet. An exhaust port is provided on the top of one side of the sealed chamber, and the first air inlet and the exhaust port are positioned opposite each other.

2. A frequency converter cabinet according to claim 1, characterized in that The sealed chamber is also provided with a heat dissipation channel, the air inlet side of which is connected to the second air inlet, and the air outlet side of which faces the heat-generating element of the frequency converter.

3. A frequency changer cabinet according to claim 2, wherein The sealed chamber is also equipped with a temperature sensor that is electrically connected to the controller. The temperature sensor is used to obtain the real-time operating temperature of the frequency converter.

4. The frequency conversion cabinet of claim 1, wherein, A first waterproof cover is provided on one side of the cabinet, and the first waterproof cover is located on the air intake side of the first air inlet; a second waterproof cover is provided on the other side of the cabinet, and the second waterproof cover is located on the air exhaust side of the exhaust port.

5. A frequency changer cabinet according to claim 4, wherein The first and second waterproof covers are louvered waterproof covers, used to prevent water vapor or rainwater from directly penetrating the interior of the cabinet.

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