PLC cabinet with dehumidification device

Abstract

The utility model relates to the technical field of control cabinets, and discloses a PLC cabinet with a dehumidification device, which comprises a cabinet body, the dehumidification device and a control assembly, the cabinet body comprises a first end and a second end which are opposite to each other, a first cavity is formed in the cabinet body, a mounting bracket is arranged in the first cavity and divides the first cavity into an air inlet cavity, an equipment cavity and an air outlet cavity, and the air inlet cavity is communicated with the equipment cavity. The air inlet cavity is provided with an air inlet, the air outlet cavity is provided with an air outlet, the installation support comprises a plurality of ventilation columns, the air inlet cavity and the air outlet cavity are communicated through the ventilation columns, and a plurality of first ventilation holes are formed in column bodies of the ventilation columns. According to the PLC cabinet with the dehumidification device, the first cavity is divided into the air inlet cavity, the equipment cavity and the air outlet cavity through the mounting bracket, and electronic components are mounted in the equipment cavity, so that the electronic components are prevented from being directly contacted with air entering the cabinet body and being damped and damaged. The PLC cabinet with the dehumidification device is reasonable in design, compact in overall structure and suitable for protecting normal work of electronic components under severe working conditions.

Description

Technical Field

[0001] The utility model relates to the technical field of control cabinets, in particular to a PLC cabinet with a dehumidification device. Background Technique

[0002] A PLC cabinet is an electrical equipment cabinet used for centralized installation and protection of PLC devices. In an industrial automation control system, a large number of electronic components are integrated inside the PLC control cabinet, which is an important place for installing devices such as a PLC controller, input / output modules, and power modules. The PLC control cabinet can adapt to various scales of industrial automation control occasions and is widely used in industries such as electric power, metallurgy, chemical industry, papermaking, and environmental protection sewage treatment.

[0003] In some application scenarios with relatively harsh environments, especially under working conditions of high temperature, humidity, poor ventilation, and large environmental temperature differences, there are not only requirements for temperature control inside the PLC cabinet, but also relatively high requirements for humidity control inside it. However, the existing technology does not have corresponding products to meet the above usage requirements. The existing PLC cabinets lack effective dehumidification devices, and their internal structures are relatively simple. When the conventional exhaust device set on the PLC cabinet conducts ventilation, it will suck in the moist air outside into the PLC cabinet. The ventilation openings set on the PLC cabinet also make it easy for the humid air to enter the PLC cabinet. The moist air entering the PLC cabinet directly blows onto the electronic components inside the cabinet, which will condense moisture on the surface of the electronic components, accelerating the growth of mold. This not only reduces the insulation strength of the electronic components but also accelerates the aging of the insulation layer of the electronic components, resulting in damage to the electronic components. Content of the Utility Model

[0004] To overcome the problems existing in the related technology, the utility model provides a PLC cabinet with a dehumidification device. A dehumidification device is arranged inside the cabinet body to heat and dry the air entering the cabinet body. The inside of the cabinet body is divided into an air inlet chamber, an equipment chamber, and an air outlet chamber. The electronic components are installed in the equipment chamber to avoid being directly blown by the air entering the cabinet body.

[0005] The technical solution adopted by the present utility model is as follows: A PLC cabinet with a dehumidification device, comprising a cabinet body, a dehumidification device, and a control component. The cabinet body includes opposite first and second ends. A first cavity is formed inside the cabinet body. An installation bracket is arranged inside the first cavity. The installation bracket divides the first cavity into an air inlet cavity, an equipment cavity, and an air outlet cavity along the direction from the first end to the second end. The air inlet cavity is provided with an air inlet, and the air outlet cavity is provided with an air outlet. The installation bracket includes a plurality of ventilation columns, and the ventilation columns are of a hollow structure. The air inlet cavity and the air outlet cavity are communicated through the ventilation columns. A plurality of first ventilation holes are provided on the column body of the ventilation columns. The dehumidification device includes a first fan, a second fan, and a heater. The first fan and the heater are arranged at the first end, and the second fan is arranged at the second end. The control component includes a PLC controller, a plurality of temperature sensors, and a plurality of humidity sensors. The dehumidification device, the temperature sensors, and the humidity sensors are electrically connected to the PLC controller.

[0006] Further, the installation bracket includes a first installation plate and a second installation plate. An air inlet cavity is formed between the first installation plate and the first end. An air outlet cavity is formed between the second installation plate and the second end. The first installation plate and the second installation plate are respectively provided with ventilation openings. The ventilation columns communicate with the corresponding ventilation openings of the first installation plate and the second installation plate.

[0007] Further, the installation bracket includes four columns, which are arranged at the four corner positions of the cabinet body. The first installation plate and the second installation plate are respectively fixedly connected to the columns.

[0008] Further, the installation bracket further includes a plurality of installation columns. The installation columns are divided into several columns and fixed on the first installation plate. The installation columns and the columns divide the equipment cavity into several installation positions.

[0009] Further, the ventilation columns are divided into several columns, and the ventilation columns in each column are aligned with each other. The ventilation columns are aligned with the installation columns.

[0010] Further, there are four ventilation openings, four ventilation columns, and the ventilation columns are divided into two columns.

[0011] Further, the air inlet cavity includes a first air outlet plate. Electrical equipment is installed in the equipment cavity to form a first equipment end face. The first air outlet plate, the first equipment end face, the second installation plate, and the inner wall of the cabinet body form a second cavity. The first air outlet plate is provided with second ventilation holes. The second installation plate is provided with third ventilation holes corresponding to the second cavity.

[0012] Further, at least one of the air inlet cavity, the equipment cavity, and the air outlet cavity is provided with the temperature sensor, and / or the humidity sensor.

[0013] Furthermore, the air inlet chamber, the equipment chamber, and the air outlet chamber are all provided with the temperature sensors and humidity sensors.

[0014] Furthermore, the first end is the bottom of the cabinet body, the second end is the top of the cabinet body, an air inlet is opened at the bottom of the cabinet body, an air outlet is opened at the top of the cabinet body, the second blower is arranged at the air outlet outside the cabinet body, the first blower and the heater are arranged in the air inlet chamber, the air inlet of the first blower is communicated with the air inlet at the bottom of the cabinet body, and the air outlet of the first blower is communicated with the air inlet of the heater.

[0015] The PLC cabinet with a dehumidifying device of the present utility model has the following technical effects: An installation bracket is arranged inside the cabinet body, and the internal space of the cabinet body is divided into an air inlet chamber, an equipment chamber, and an air outlet chamber by means of the installation bracket. Electronic components are installed in the equipment chamber to avoid direct contact with the air entering the cabinet body. The external air entering the cabinet body will first stay in the air inlet chamber and the air outlet chamber. Thus, a dehumidifying device can be arranged on the air inlet chamber and the air outlet chamber to heat and dry the air and filter the air entering the cabinet body. The installation bracket is provided with ventilation columns for communicating the air inlet chamber and the air outlet chamber. Ventilation holes are arranged on the ventilation columns, and the hot air blown out from the air inlet chamber can enter the equipment chamber through the ventilation holes to dehumidify the electronic components in the equipment chamber. At the same time, temperature sensors and humidity sensors electrically connected to the PLC controller are arranged inside the cabinet body, and the measured values of the temperature and humidity inside the cabinet body can be uploaded to the PLC controller, and the PLC controller controls the working state of the dehumidifying device to realize the function of automatic dehumidification. The PLC cabinet with a dehumidifying device is reasonably designed, and the overall structure is compact. While leaving enough space for installing electronic components, an air inlet chamber and an air outlet chamber are designed to avoid the problem that the electronic components are directly blown by the moist air, resulting in a reduction in the insulation strength of the electronic components, an acceleration of the aging of the insulation layer, and even damage to the electronic components.

[0016] Other features and advantages of the present utility model will be described in detail in the subsequent specific implementation part. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific implementation, they are used to explain the present disclosure, but do not constitute a limitation to the present disclosure. In the drawings:

[0018] Figure 1 is a schematic diagram of the overall structure of a PLC cabinet with a dehumidifying device (I) shown according to an exemplary embodiment.

[0019] Figure 2 is a schematic diagram of the structure of the installation bracket of a PLC cabinet with a dehumidifying device (I) shown according to an exemplary embodiment.

[0020] Figure 3 Schematic diagram (II) of the mounting bracket structure of a PLC cabinet with a dehumidifying device shown according to an exemplary embodiment.

[0021] Figure 4 Schematic diagram (III) of the mounting bracket structure of a PLC cabinet with a dehumidifying device shown according to an exemplary embodiment

[0022] Figure 5 Schematic diagram (II) of the overall structure of a PLC cabinet with a dehumidifying device shown according to an exemplary embodiment.

[0023] Figure 6 Schematic diagram (III) of the overall structure of a PLC cabinet with a dehumidifying device shown according to an exemplary embodiment.

[0024] Figure 7 Schematic diagram of the circuit connection of the internal dehumidifying device of a PLC cabinet with a dehumidifying device shown according to an exemplary embodiment.

[0025] Reference numerals: 10, PLC cabinet with a dehumidifying device; 20, cabinet body; 21, air inlet; 22, air outlet; 23, air inlet chamber; 24, equipment chamber; 241, installation position; 25, air outlet chamber; 30, mounting bracket; 31, ventilation column; 311, first ventilation hole; 32, first mounting plate; 33, second mounting plate; 331, third ventilation hole; 34, ventilation port; 35, column; 36, mounting column; 37, first air outlet plate; 371, second ventilation hole; 40, first fan; 50, heater; 60, second fan; 70, temperature sensor; 80, humidity sensor; 90, PLC controller. Detailed implementation manners

[0026] The following details the specific implementation manners disclosed in the present utility model in conjunction with the accompanying drawings. It should be understood that the specific implementation manners described herein are only for the purpose of illustration and explanation of the present disclosure, and are not used to limit the present disclosure.

[0027] As Figures 1 to 7As shown, this is an exemplary embodiment of the present utility model. The PLC cabinet 10 with a dehumidification device of the present utility model includes a cabinet body 20, a dehumidification device and a control component. The cabinet body 20 includes opposite first and second ends. A first cavity is formed inside the cabinet body 20. An installation bracket 30 is arranged inside the first cavity. The installation bracket 30 divides the first cavity into an air inlet cavity 23, an equipment cavity 24 and an air outlet cavity 25 along the direction from the first end to the second end. The air inlet cavity 23 is provided with an air inlet 21, and the air outlet cavity 25 is provided with an air outlet 22. The installation bracket 30 includes a plurality of ventilation columns 31. The ventilation columns 31 are of a hollow structure. The air inlet cavity 23 and the air outlet cavity 25 are communicated through the ventilation columns 31. A plurality of first ventilation holes 311 are provided on the column body of the ventilation column 31. The dehumidification device includes a first fan 40, a second fan 60 and a heater 50. The first fan 40 and the heater 50 are arranged at the first end, and the second fan 60 is arranged at the second end. The control component includes a PLC controller 90, a plurality of temperature sensors 70 and a plurality of humidity sensors 80. The dehumidification device, the temperature sensors 70 and the humidity sensors 80 are electrically connected to the PLC controller 90.

[0028] The PLC cabinet 10 with a dehumidification device of the present utility model arranges an installation bracket 30 inside the cabinet body 20. With the help of the installation bracket 30, the internal space of the cabinet body 20 is divided into an air inlet cavity 23, an equipment cavity 24 and an air outlet cavity 25. The equipment cavity 24 where electronic components are installed is separately isolated inside the cabinet body 20 to prevent the electronic components on it from being directly blown by the moist air entering the cabinet body 20. The external air entering the cabinet body 20 will first stay in the air inlet cavity 23 and the air outlet cavity 25. In this way, a dehumidification device can be arranged on the air inlet cavity 23 and the air outlet cavity 25 to heat and dry the air and filter the air entering the cabinet body 20. The installation bracket 30 is also provided with ventilation columns 31 for communicating the air inlet cavity 23 and the air outlet cavity 25. Ventilation holes are provided on the ventilation columns 31. The hot air blown out from the air inlet cavity 23 can enter the equipment cavity 24 through the ventilation holes to dehumidify the electronic components in the equipment cavity 24. A plurality of temperature sensors 70 and humidity sensors 80 are arranged inside the cabinet body 20. They can measure the temperature and humidity inside the cabinet body 20 and upload the measured values to the PLC controller 90. The PLC controller 90 controls the working state of the dehumidification device to achieve the purpose of automatic dehumidification.

[0029] Exemplarily, such as Figures 1 to 7As shown, in the exemplary embodiment disclosed by the present utility model, the mounting bracket 30 includes a first mounting plate 32 and a second mounting plate 33. An air inlet cavity 23 is formed between the first mounting plate 32 and the first end, and an air outlet cavity 25 is formed between the second mounting plate 33 and the second end. The first mounting plate 32 and the second mounting plate 33 are respectively provided with ventilation openings 34, and the ventilation columns 31 communicate with the corresponding ventilation openings 34 of the first mounting plate 32 and the second mounting plate 33. The mounting bracket 30 includes four columns 35, which are arranged at the four corner positions of the cabinet body 20, and the first mounting plate 32 and the second mounting plate 33 are respectively fixedly connected to the columns 35. The mounting bracket 30 further includes a plurality of mounting columns 36. The mounting columns 36 are divided into several columns and fixed on the first mounting plate 32. The mounting columns 36 and the columns 35 divide the equipment cavity 24 into several mounting positions 241.

[0030] The PLC cabinet 10 with a dehumidification device of the present utility model utilizes the first mounting plate 32 and the second mounting plate 33 to divide the internal space of the cabinet body 20 into an air inlet cavity 23, an equipment cavity 24, and an air outlet cavity 25. Ventilation openings 34 are provided on the first mounting plate 32 and the second mounting plate 33. After the air outside the cabinet body 20 enters the air inlet cavity 23, it enters the ventilation columns 31 through the ventilation openings 34 on the first mounting plate 32, and then enters the equipment cavity 24 through the first ventilation holes 311 on the ventilation columns 31. The air in the equipment cavity 24 can also enter the ventilation columns 31 through the first ventilation holes 311. The air flows along the ventilation columns 31 and can enter the air outlet cavity 25 through the ventilation openings 34 on the second mounting plate 33 and then flow out of the cabinet body 20 from the air outlet cavity 25. In this way, it is ensured that the air can circulate inside the cabinet body 20. The mounting bracket 30 includes four columns 35, which are used to support the main structure of the PLC cabinet. The first mounting plate 32 and the second mounting plate 33 are both fixed on the columns 35. Mounting columns 36 are also provided on the first mounting plate 32. The mounting columns 36 and the columns 35 on both sides divide the equipment cavity 24 into several equipment mounting positions 241. Threaded holes are provided on both the mounting columns 36 and the columns 35, and the electronic components are fixed to the mounting columns 36 and the columns 35 through corresponding bolts.

[0031] Specifically, the first end is the bottom of the cabinet body 20, and the second end is the top of the cabinet body 20. An air inlet 21 is provided at the bottom of the cabinet body 20, and an air outlet 22 is provided at the top of the cabinet body 20. The second fan 60 is arranged at the air outlet 22 outside the cabinet body 20. The first fan 40 and the heater 50 are arranged in the air inlet cavity 23. The air inlet of the first fan 40 is communicated with the air inlet 21 at the bottom of the cabinet body 20, and the air outlet of the first fan 40 is communicated with the air inlet of the heater 50. The ventilation columns 31 are divided into several columns, and the ventilation columns 31 in each column are aligned with each other, and the ventilation columns 31 are aligned with the mounting columns 36. Optionally, there are four ventilation openings 34, four ventilation columns 31, and the ventilation columns 31 are divided into two columns.

[0032] The columns 35 of the PLC cabinet 10 with a dehumidification device of the present utility model are arranged at the four corners. The side surface and the bottom of the cabinet body 20 are both fixed on the columns 35, and the top of the cabinet body 20 covers the side surface of the cabinet body 20. An air inlet 21 is provided at the bottom of the cabinet body 20, and an air outlet 22 is provided at the top of the cabinet body 20. The first fan 40 and the heater 50 are arranged in the air inlet chamber 23. The air inlet 21 of the first fan 40 is communicated with the air inlet 21 at the bottom of the cabinet body 20 for sucking in external air. The air outlet 22 of the first fan 40 is communicated with the air inlet 21 of the heater 50. The air sucked in by the first fan 40 enters the heater 50 to be heated and dried, and then flows out of the heater 50 and enters the air inlet chamber 23. A second fan 60 is provided at the air outlet 22 outside the cabinet body 20. The air inlet 21 of the second fan 60 is communicated with the air outlet 22 at the top of the cabinet body 20 for sucking in the air in the air outlet chamber 25 and discharging it to the outside of the cabinet body 20 to keep the air inside the cabinet body 20 circulating. At the same time, the second fan 60 also seals the air outlet 22 at the top of the cabinet body 20 to prevent external air from entering the air outlet chamber 25 through this air outlet 22. Ventilation columns 31 are arranged in the equipment chamber 24 inside the cabinet body 20. The ventilation columns 31 in each column are aligned with each other and are aligned with the mounting columns 36. The alignment of the ventilation columns 31 and the mounting columns 36 can save the internal space of the equipment chamber 24 and prevent the ventilation columns 31 from blocking the installation of electronic components. The alignment of the ventilation columns 31 in each column can make the hot air blown out from the air inlet chamber 23 fill the equipment chamber 24 more evenly, and the dehumidification effect is better. Preferably, in the PLC cabinet 10 with a dehumidification device of the present utility model, there are four ventilation holes 34 opened on the first mounting plate 32 and the second mounting plate 33, and there are also four ventilation columns 31, which are arranged in two columns, dividing the equipment chamber 24 into three mounting positions 241. The number and the number of columns of the ventilation columns 31 should be comprehensively considered in terms of the width of the cabinet body 20 and the size of the electronic components to be installed.

[0033] Exemplarily, as Figures 1 to 6 shown, the air inlet chamber 23 of the PLC cabinet 10 with a dehumidification device of the present utility model includes a first air outlet plate 37. Electrical equipment is installed in the equipment chamber 24 to form a first equipment end face. The first air outlet plate 37, the first equipment end face, the second mounting plate 33 and the inner wall of the cabinet body 20 form a second cavity. The first air outlet plate 37 is provided with a second ventilation hole 371, and the second mounting plate 33 is provided with a third ventilation hole 331 at the position corresponding to the second cavity.

[0034] In an exemplary embodiment of the present disclosure, the first air outlet plate 37 is fixed to the bottoms of two columns 35, and together with the first mounting plate 32, the side surface of the cabinet body 20, and the bottom of the cabinet body 20, it defines an air inlet cavity 23. An electrical device is installed in the equipment cavity 24 to form a first equipment end face. The first air outlet plate 37, the first equipment end face, the second mounting plate 33, the bottom of the cabinet body 20, and the inner wall surface of the cabinet body 20 define a second cavity. Among them, the inner wall surface of the cabinet body 20 can be all the side surfaces of the cabinet body 20, or it can be the cabinet door of the cabinet body 20 and two side surfaces of the cabinet body 20. The length and width of the second mounting plate 33 are the same as the length and width of the cabinet body 20. The length of the first mounting plate 32 is slightly less than the length of the cabinet body 20, or the width is slightly less than the width of the cabinet body 20, and its length and width are the same as the length and width of the rectangle defined by the four columns 35. The cabinet body 20 is fixed on the four columns 35, and its length or width is greater than the length and width of the rectangle defined by the four columns 35. The second ventilation holes 371 are provided on the first air outlet plate 37, and the third ventilation holes 331 are opened at the positions corresponding to the second cavity on the second mounting plate 33. The hot air blown out from the air inlet cavity 23 can be blown out from the second ventilation holes 371 to dehumidify the outer end faces of the electronic components in the equipment cavity 24, and then return to the air outlet cavity 25 through the third ventilation holes 331 on the second mounting plate 33.

[0035] Exemplarily, as Figures 2 to 4 and Figure 6 shown, at least one of the air inlet cavity 23, the equipment cavity 24, and the air outlet cavity 25 of the PLC cabinet 10 with a dehumidification device of the present utility model is provided with a temperature sensor 70, and / or a humidity sensor 80. Preferably, in an exemplary embodiment of the present disclosure, the air inlet cavity 23, the equipment cavity 24, and the air outlet cavity 25 are all provided with a temperature sensor 70 and a humidity sensor 80.

[0036] By arranging the temperature sensor 70 and the humidity sensor 80 inside the cabinet body 20 to measure the humidity and temperature conditions inside the cabinet body 20 and upload the corresponding measured values to the PLC controller 90, the PLC controller 90 controls the working states of the first fan 40, the heater 50, and the second fan 60 to realize the function of automatic dehumidification inside the cabinet body 20. Sensors are arranged in each cavity inside the cabinet body 20, which can enable the PLC controller 90 to more accurately control the dehumidification device to work and control the temperature and humidity inside the cabinet body 20 within the optimal range.

[0037] The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0038] In addition, it should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without conflict. To avoid unnecessary repetition, the present disclosure will not separately describe various possible combination methods.

[0039] Furthermore, any combinations can be made among the various different embodiments of the present disclosure, as long as they do not violate the idea of the present disclosure, and they should also be regarded as the content disclosed by the present disclosure.

Claims

1. A PLC cabinet with a dehumidification device, characterized in that, Comprising A cabinet body, the cabinet body includes opposite first and second ends, a first cavity is formed inside the cabinet body, an installation bracket is arranged in the first cavity, and the installation bracket divides the first cavity into an air inlet cavity, an equipment cavity and an air outlet cavity along the direction from the first end to the second end. The air inlet cavity is provided with an air inlet, the air outlet cavity is provided with an air outlet, the installation bracket includes a plurality of ventilation columns, the ventilation columns are of a hollow structure, the air inlet cavity and the air outlet cavity are communicated through the ventilation columns, and a plurality of first ventilation holes are arranged on the column body of the ventilation columns; A dehumidification device, the dehumidification device includes a first fan, a second fan and a heater, the first fan and the heater are arranged at the first end, and the second fan is arranged at the second end; A control component, the control component includes a PLC controller, a plurality of temperature sensors and a plurality of humidity sensors, and the dehumidification device, the temperature sensors and the humidity sensors are electrically connected to the PLC controller.

2. The PLC cabinet with a dehumidification device according to claim 1, characterized in that, The installation bracket includes a first installation plate and a second installation plate. An air inlet cavity is formed between the first installation plate and the first end, and an air outlet cavity is formed between the second installation plate and the second end. The first installation plate and the second installation plate are respectively provided with ventilation openings, and the ventilation columns communicate with the corresponding ventilation openings of the first installation plate and the second installation plate.

3. The PLC cabinet with a dehumidifying device according to claim 2, characterized in that, The installation bracket includes four columns, which are arranged at the four corner positions of the cabinet body, and the first installation plate and the second installation plate are respectively fixedly connected to the columns.

4. The PLC cabinet with a dehumidification device according to claim 3, characterized in that, The installation bracket further includes a plurality of installation columns, and the installation columns are divided into several columns and fixed on the first installation plate. The installation columns and the columns divide the equipment cavity into several installation positions.

5. The PLC cabinet with a dehumidification device according to claim 4, characterized in that, The ventilation columns are divided into several columns, and the ventilation columns in each column are aligned with each other, and the ventilation columns are aligned with the installation columns.

6. The PLC cabinet with a dehumidification device according to claim 5, characterized in that, There are four ventilation openings, four ventilation columns, and the ventilation columns are divided into two columns.

7. The PLC cabinet with a dehumidification device according to claim 2, characterized in that, The air inlet cavity includes a first air outlet plate. Electrical equipment is installed in the equipment cavity to form a first equipment end face. The first air outlet plate, the first equipment end face, the second installation plate and the inner wall of the cabinet body form a second cavity. The first air outlet plate is provided with second ventilation holes, and the second installation plate is provided with third ventilation holes corresponding to the second cavity.

8. The PLC cabinet with a dehumidification device according to claim 1, characterized in that, At least one of the air inlet cavity, the equipment cavity and the air outlet cavity is provided with the temperature sensor, and / or the humidity sensor.

9. The PLC cabinet with a dehumidification device according to claim 8, characterized in that, The temperature sensor and the humidity sensor are provided in the air inlet cavity, the equipment cavity and the air outlet cavity.

10. The PLC cabinet with a dehumidification device according to claim 1, characterized in that, The first end is the bottom of the cabinet body, the second end is the top of the cabinet body, an air inlet is opened at the bottom of the cabinet body, an air outlet is opened at the top of the cabinet body, the second fan is arranged at the air outlet outside the cabinet body, the first fan and the heater are arranged in the air inlet cavity, the air inlet of the first fan is communicated with the air inlet at the bottom of the cabinet body, and the air outlet of the first fan is communicated with the air inlet of the heater.

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