Electrical control cabinet

Abstract

The embodiment of the utility model provides an electrical control cabinet. A cabinet body of the electrical control cabinet comprises a containing cavity, an air inlet and a plurality of air outlets, wherein the air inlet and the air outlets are communicated with the containing cavity. The air inlet is formed in the side part of the cabinet body. The multiple air outlets are formed in the top of the cabinet body. And the plurality of fans are detachably mounted at the plurality of air outlets respectively. The centralized manager is coupled to the cabinet body and electrically connected with the plurality of fans. The centralized manager can control any one of the plurality of fans to operate as a main fan, and can control the remaining fans of the plurality of fans as standby fans. The main fan can enable external air to enter the containing cavity through the air inlet and flow out through the corresponding air outlet. By means of the arrangement, when the main fan breaks down, the centralized manager can automatically switch the standby fan to continue working. After the main fan fails, continuous and stable operation of the electrical control cabinet can be ensured, so that the requirement of continuous operation of a load is met.

Description

TECHNICAL FIELD

[0001] Embodiments of the present disclosure generally relate to the field of electrical equipment, and in particular, to an electrical control cabinet. BACKGROUND

[0002] The electrical control cabinet is widely used in the industry and production field, which can distribute and control the power of various mechanical equipment. In the use process, the electronic components inside the electrical control cabinet will generate heat, especially the solid-state switching technology. High temperature environment not only can weaken the performance of electronic components, but also can cause the failure rate to rise, affecting the stability and reliability of the whole system. In a conventional electrical control cabinet, the service life of the fan is relatively short, in order to ensure the safety of the system, the system needs to be shut down for maintenance and replacement when the fan fails, which cannot meet the requirement of continuous operation of the load. SUMMARY

[0003] The purpose of embodiments of the present disclosure is to provide an electrical control cabinet to at least partially solve the above problems and other potential problems.

[0004] Embodiments of the present disclosure provide an electrical control cabinet. The electrical control cabinet comprises: a cabinet body comprising a receiving cavity, and an air inlet and a plurality of air outlets in communication with the receiving cavity, the air inlet being arranged at a side of the cabinet body, and the plurality of air outlets being arranged at a top of the cabinet body; a plurality of fans, each of which is detachably installed at a corresponding air outlet; and a centralized manager coupled to the cabinet body and electrically connected with the plurality of fans, the centralized manager being capable of controlling any one of the plurality of fans to operate as a main fan, and capable of controlling the remaining fans to operate as backup fans, the main fan being capable of causing external air to enter the receiving cavity through the air inlet and flow out through the corresponding air outlet.

[0005] In some embodiments, a wind baffle is arranged between two adjacent air outlets to prevent airflow short circuit.

[0006] In some embodiments, the electrical control cabinet further comprises: a filter screen arranged at the air inlet and coupled to the cabinet body.

[0007] In some embodiments, the receiving cavity comprises a front side area for arranging a plurality of drawer assemblies, a middle area for arranging busbars, and a rear side area for arranging cables, the plurality of air outlets correspond to the front side area and the middle area, and the air inlet is located at the bottom of the cabinet body.

[0008] In some embodiments, the drawer assembly comprises a motor starter, and the motor starter is electrically connected with the centralized manager.

[0009] In some embodiments, the electrical control cabinet further comprises: a first temperature detection unit disposed in the motor starter and electrically connected to the centralized manager, the first temperature detection unit being capable of detecting an ambient temperature value in the motor starter and generating a first temperature signal to enable the centralized manager to control the operation of the plurality of fans based at least on the first temperature signal.

[0010] In some embodiments, the electrical control cabinet further comprises: a second temperature detection unit disposed in the intermediate region and electrically connected to the centralized manager, the second temperature detection unit being capable of detecting a temperature value of the busbar and generating a second temperature signal to enable the centralized manager to control the operation of the plurality of fans based at least on the second temperature signal.

[0011] In some embodiments, the electrical control cabinet further comprises: a current detection unit coupled to a power supply circuit of the fan and electrically connected to the centralized manager, the current detection unit being capable of detecting a current value of the power supply circuit and generating a current detection signal to enable the centralized manager to control the operation of the plurality of fans based at least on the current detection signal.

[0012] In some embodiments, the air inlet comprises a first air inlet located at a front side of the cabinet body, the bottom of the cabinet body is provided with an air duct in communication with the first air inlet, and the cabinet body comprises: a first bottom plate disposed between the air duct and the front side region and comprising a plurality of first through holes penetrating the first bottom plate, the front side region being capable of communicating with the air duct via the plurality of first through holes.

[0013] In some embodiments, the air inlet further comprises a second air inlet located at a rear side of the cabinet body, and the cabinet body further comprises: a second bottom plate disposed at the bottom of the cabinet body and corresponding to the intermediate region and comprising a plurality of second through holes penetrating the second bottom plate, the intermediate region being capable of communicating with the second air inlet via the plurality of second through holes; and / or a third bottom plate disposed at the bottom of the cabinet body and corresponding to the rear side region and comprising a plurality of third through holes penetrating the third bottom plate, the rear side region being capable of communicating with the second air inlet via the plurality of third through holes.

[0014] In embodiments of the present disclosure, the electrical control cabinet comprises a cabinet body, a centralized manager and a plurality of fans. The cabinet body comprises a receiving cavity, and an air inlet and a plurality of air outlets in communication with the receiving cavity. The air inlet is arranged at a side of the cabinet body. The plurality of air outlets are arranged at a top of the cabinet body. The plurality of fans are respectively detachably installed at the plurality of air outlets. The centralized manager is coupled to the cabinet body and electrically connected with the plurality of fans. The centralized manager is capable of controlling any one of the plurality of fans to operate as a main fan, and is capable of controlling the remaining fans as standby fans. The main fan is capable of causing external air to enter the receiving cavity via the air inlet and flow out via the corresponding air outlet. With this arrangement, the main fan can effectively reduce the temperature of electrical elements in the electrical control cabinet when in operation, thereby improving element performance and reducing failure rate. Once the main fan fails, the centralized manager will automatically switch the standby fan to continue working, ensuring uninterrupted cooling. After the main fan fails, it can be ensured that the electrical control cabinet continues to operate stably, thereby meeting the requirement of continuous operation of the load.

[0015] It should be understood that the content described in this content part is not intended to limit the key features or important features of the embodiments of the present disclosure, nor is it used to limit the scope of the present disclosure. Other features of the present disclosure will become apparent through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0016] The above and other features, advantages, and aspects of embodiments of the present disclosure will become more apparent by describing in detail embodiments thereof with reference to the attached drawings in which:

[0017] Figure 1 A perspective view of an electrical control cabinet according to an embodiment of the present disclosure is shown;

[0018] Figure 2 A schematic view of an internal structure of an electrical control cabinet according to an embodiment of the present disclosure is shown;

[0019] Figure 3 A circuit block diagram of an electrical control cabinet according to an embodiment of the present disclosure is shown; and

[0020] Figure 4 A perspective view of a first bottom plate, a second bottom plate and a third bottom plate according to an embodiment of the present disclosure is shown.

[0021] BRIEF DESCRIPTION OF DRAWINGS

[0022] 10, cabinet body; 101, receiving cavity; 101a, front side area; 101b, middle area; 101c, rear side area; 11, air inlet; 11a, first air inlet; 11b, second air inlet; 12, air outlet; 13, filter screen; 14, air duct;

[0023] 20, fan;

[0024] 30. Centralized manager;

[0025] 40. Drawer assembly;

[0026] 51. A first temperature detection unit;

[0027] 52. Second temperature detection unit;

[0028] 53. Current detection unit;

[0029] 61, first bottom plate; 610, first through hole; 62, second bottom plate; 620, second through hole; 63, third bottom plate; 630, third through hole;

[0030] 70. Motor;

[0031] 80. Busbar;

[0032] 90. Power supply circuit. DETAILED DESCRIPTION

[0033] The preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to make the present disclosure more thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art.

[0034] As used herein, the term "including" and its variations represent open inclusion, i.e., "including but not limited to." Unless otherwise stated, the term "or" means "and / or." The term "based on" means "based at least in part on." The terms "one example embodiment" and "an embodiment" mean "at least one example embodiment." The term "another embodiment" means "at least one additional embodiment." The terms "first," "second," etc. may refer to different or identical objects.

[0035] As mentioned above, in a conventional electrical control cabinet, the service life of the fan is relatively short. To ensure system safety, when the fan fails, the system needs to be shut down for maintenance and replacement, which cannot meet the requirement of continuous load operation.

[0036] Embodiments of the present disclosure provide an electrical control cabinet. The cabinet body of the electrical control cabinet includes a receiving cavity, and an air inlet and a plurality of air outlets in communication with the receiving cavity. The air inlet is arranged at a side of the cabinet body. The plurality of air outlets are arranged at a top of the cabinet body. A plurality of fans are respectively detachably installed at the plurality of air outlets. A centralized manager is coupled to the cabinet body and electrically connected with the plurality of fans. The centralized manager is capable of controlling any one of the plurality of fans to operate as a main fan, and is capable of controlling the remaining fans as standby fans. The main fan is capable of causing external air to enter the receiving cavity through the air inlet and flow out through the corresponding air outlet. With this arrangement, the main fan can effectively reduce the temperature of the electrical elements in the electrical control cabinet when in operation, thereby improving the performance of the elements and reducing the failure rate. Once the main fan fails, the centralized manager automatically switches to the standby fan to continue working, ensuring uninterrupted cooling. After the main fan fails, the electrical control cabinet can continue to operate stably, thereby meeting the requirement of continuous operation of the load. The principles of the present disclosure will be described in detail below with reference to the accompanying drawings. Figures 1 to 4

[0037] Figure 1 A perspective view of an electrical control cabinet according to an embodiment of the present disclosure is shown, Figure 2 A schematic view of the internal structure of an electrical control cabinet according to an embodiment of the present disclosure is shown, Figure 3 A circuit block diagram of an electrical control cabinet according to an embodiment of the present disclosure is shown. As Figures 1 to 3 shown, the electrical control cabinet described herein generally includes a cabinet body 10, a centralized manager 30, and a plurality of fans 20. The cabinet body 10 is internally provided with a receiving cavity 101 for installing and protecting electrical elements. In addition, the cabinet body 10 is provided with an air inlet 11 and a plurality of air outlets 12 in communication with the receiving cavity 101. The air inlet 11 is arranged at a side of the cabinet body 10, facilitating the introduction of external air. The plurality of air outlets 12 are arranged at a top of the cabinet body 10, facilitating the discharge of hot air from the top.

[0038] In some embodiments, the air inlet 11 can be arranged at different sides of the cabinet body 10, such as the front side and the rear side, thereby introducing cold air from different sides of the cabinet body 10 into the cabinet body 10. In this way, a plurality of air flow paths can be formed between the air inlets 11 and the plurality of air outlets 12 at different sides, thereby cooling different areas within the cabinet body 10.

[0039] As Figure 1 and Figure 2 shown, the plurality of fans 20 are respectively detachably installed at the plurality of air outlets 12. In the event of a fan 20 failure, the fan 20 can be easily maintained and replaced. During operation of the fan 20, the fan 20 can effectively reduce the temperature of the electrical elements within the electrical control cabinet, improving the performance and reliability of the elements and reducing overheating-induced failures.

[0040] As​Figure 1 and Figure 2 As shown, a centralized cooling fan 30 is mounted on the cabinet 10. The centralized cooling fan 30 is electrically connected to multiple fans 20. During operation, the centralized cooling fan 30 can control any one of the multiple fans 20 as a primary fan 20 and the remaining fans as backup fans. If the primary fan 20 fails, the centralized cooling fan 30 automatically switches to a backup fan, ensuring uninterrupted cooling.

[0041] This arrangement effectively reduces the temperature of electrical components within the electrical control cabinet while the main fan 20 is running, thereby improving component performance and reducing failure rates. If the main fan 20 fails, the centralized manager 30 automatically switches to the backup fan 20 to ensure uninterrupted cooling. This ensures continued stable operation of the electrical control cabinet even after the main fan 20 fails, thus meeting the requirements for continuous load operation.

[0042] In some embodiments, a windshield (not shown) is provided between two adjacent air outlets 12 to prevent airflow short-circuiting. When the main fan 20 is running, the windshield can block the air from other air outlets 12 from entering the main fan 20, thereby avoiding the occurrence of airflow short-circuiting. During operation, the main fan 20 can smoothly discharge the hot air in the accommodating cavity 101. While discharging the hot air, the pressure difference effect can be used to attract external cold air into the accommodating cavity 101 through the air inlet 11. In this way, the continuity and effectiveness of the airflow can be ensured, which not only improves the cooling efficiency, but also avoids the cooling blind spots caused by airflow turbulence, thereby better protecting the electrical components in the electrical control cabinet.

[0043] In some embodiments, as Figure 1 and Figure 2 As shown, the electrical control cabinet further includes a filter 13 disposed at the air inlet 11, and the filter 13 is coupled to the cabinet body 10. With this arrangement, the filter 13 can intercept dust, particulate matter, and other debris in the air, preventing these pollutants from entering the interior of the electrical control cabinet, thereby protecting the electrical components from contamination and damage.

[0044] In some embodiments, as Figure 2 As shown, the housing 101 of the electrical control cabinet includes a front area 101a for arranging multiple drawer assemblies 40, a middle area 101b for arranging busbars 80, and a rear area 101c for arranging cables. Multiple air outlets 12 are arranged corresponding to the front area 101a and the middle area 101b. For example, one air outlet 12 corresponds to the front area 101a, and another air outlet 12 corresponds to the middle area 101b. Furthermore, an air inlet 11 is located at the bottom of the cabinet 10.

[0045] In this way, the external cold air entering the accommodation cavity 101 through the bottom air inlet 11 is more likely to flow in the front area 101a and the middle area 101b, thereby cooling the drawer assembly 40 in the front area 101a and the busbar 80 in the middle area 101b. The electrical elements in the drawer assembly 40 and the busbar 80 are the main heat-generating elements in the cabinet 10. The cold air flowing in the process can timely discharge the heat generated by the electrical elements in the busbar 80 and the drawer assembly 40.

[0046] In some embodiments, as shown in Figure 3 The motor starter is electrically connected with the centralized manager 30 and externally connected with the motor 70. During the operation of the main fan 20, the temperature of the motor starter can be effectively reduced, thereby ensuring the stable operation of the electrical control cabinet and the motor 70. During the operation of the main fan 20, the external cold air enters the front area 101a of the electrical control cabinet through the air inlet 11, carries away the heat generated by the internal electrical elements of the motor starter when passing through the motor starter, and then is discharged from the top air outlet 12.

[0047] In some embodiments, the centralized manager 30 can monitor the temperature and working state of the motor starter in real time, and once an abnormality is found, the working mode of the fan 20 can be adjusted in time or an alarm can be sent, thereby enhancing the safety and reliability of the system.

[0048] In some embodiments, as shown in Figure 3 The electrical control cabinet further includes a first temperature detection unit 51. The first temperature detection unit 51 is arranged in the motor starter and is electrically connected with the centralized manager 30. The first temperature detection unit 51 can detect the ambient temperature value in the motor starter and generate a first temperature signal. The centralized manager 30 can control the operation of the plurality of fans 20 based on the first temperature signal.

[0049] As an example, the centralized manager 30 can adjust the working mode or power of the main fan 20 according to the ambient temperature value in the motor starter. For example, when the ambient temperature value is high, the centralized manager 30 can automatically increase the power, gear of the main fan 20, or adjust it to a strong wind mode, so as to enhance the cooling effect and ensure that the temperature of the motor starter is rapidly reduced, thereby protecting the electrical elements in the motor starter from high-temperature damage.

[0050] As another example, the centralized manager 30 can also determine whether the main fan 20 is malfunctioning based on the temperature value of the motor starter. For example, if the temperature value of the motor starter is abnormally high when the motor starter is operating normally, or if the temperature value continues to rise after the power or gear of the main fan 20 has been increased, the centralized manager 30 can determine that the main fan 20 is malfunctioning. At this time, the centralized manager 30 can automatically switch to the backup fan 20 to continue operating, ensuring uninterrupted operation of the cooling system. At the same time, the centralized manager 30 can also issue an alarm to notify maintenance personnel to check and replace the malfunctioning main fan 20 in a timely manner, avoiding damage to electrical components and system failure due to insufficient cooling.

[0051] In some embodiments, as shown in FIG. 1, the electrical control cabinet further includes a second temperature detection unit 52. The second temperature detection unit 52 is disposed in the middle region 101b and is electrically connected to the centralized manager 30. The second temperature detection unit 52 can detect the temperature value of the busbar 80 and generate a second temperature signal. The centralized manager 30 can control the operation of the plurality of fans 20 based on the second temperature signal. Figure 3

[0052] As an example, the centralized manager 30 can adjust the power or operating mode of the main fan 20 based on the temperature value of the busbar 80. For example, when the temperature value of the busbar 80 is high, the centralized manager 30 can automatically increase the power or gear of the main fan 20 or adjust it to a strong wind mode to enhance the cooling effect and ensure that the temperature of the busbar 80 decreases rapidly.

[0053] As another example, the centralized manager 30 can also determine whether the main fan 20 is malfunctioning based on the temperature value of the busbar 80.

[0054] In some embodiments, as shown in FIG. 1, the electrical control cabinet further includes a current detection unit 53. The current detection unit 53 is coupled to the power supply circuit 90 of the fan 20 and is electrically connected to the centralized manager 30. The current detection unit 53 can detect the current value of the power supply circuit 90 and generate a current detection signal. The centralized manager 30 can control the operation of the plurality of fans 20 based on the current detection signal. In this way, the centralized manager 30 can determine the state of the fan 20 based on the current value of the power supply circuit 90 and implement start-stop control of the plurality of fans 20 based on the detected current. Figure 3

[0055] As an example, if the current value is close to 0, it can be determined that the fan is damaged. If the current value is several times the rated current, it can be determined that the fan is stalled. If the current value is within the normal operating current range, it can be used to determine the speed of the fan. On this basis, the speed of the fan can also be adjusted by controlling the current size.

[0056] ​​In some embodiments, the start-stop of the fan 20 can be controlled by a relay or a power semiconductor device, and the sampling of the working current can be performed by a shunt resistor or a current transformer, etc. in series in the power supply circuit 90. The sampling signal is sent to the processor inside the centralized manager 30 through a digital isolator for calculation and judgment. In this way, the state of the fan 20 can be monitored in real time, and timely measures can be taken when the fan 20 fails, such as switching to a backup fan 20 or issuing an alarm, etc.

[0057] In some embodiments, as shown in Figure 2 , the air inlet 11 includes a first air inlet 11a located at the front side of the cabinet 10. The bottom of the cabinet 10 is provided with an air duct 14 in communication with the first air inlet 11a. In addition, in combination with Figure 2 and Figure 4 , the cabinet 10 further includes a first bottom plate 61. The first bottom plate 61 is arranged between the air duct 14 and the front side area 101a, and the first bottom plate 61 includes a plurality of first through holes 610 penetrating through the first bottom plate 61. In this way, the front side area 101a can be in communication with the air duct 14 via the plurality of first through holes 610, so that external air can smoothly enter the front side area 101a via the first air inlet 11a, the air duct 14 and the plurality of first through holes 610, and then cool the electrical elements in the plurality of drawer assemblies 40.

[0058] In some embodiments, as shown in Figure 2 , the air inlet 11 further includes a second air inlet 11b located at the rear side of the cabinet 10. The cabinet 10 further includes a second bottom plate 62. The second bottom plate 62 is arranged at the bottom of the cabinet 10 and corresponds to the middle area 101b. As shown in Figure 4 , the second bottom plate 62 includes a plurality of second through holes 620 penetrating through the second bottom plate 62. In this way, the middle area 101b can be in communication with the second air inlet 11b via the plurality of second through holes 620, so that the busbar 80 in the middle area 101b can be cooled through the second through holes 620 on the second bottom plate 62 and the second air inlet 11b. The second through holes 620 can provide additional cold air inlets, and can enhance the flow of air, thereby ensuring that the busbar 80 in the middle area 101b is more fully cooled.

[0059] In some embodiments, as shown in Figure 2 and Figure 4 , the cabinet 10 further includes a third bottom plate 63. The third bottom plate 63 is arranged at the bottom of the cabinet 10 and corresponds to the rear side area 101c, and the third bottom plate 63 includes a plurality of third through holes 630 penetrating through the third bottom plate 63. In this way, the rear side area 101c can be in communication with the second air inlet 11b via the plurality of third through holes 630, so that the cables in the rear side area 101c can exchange heat with the cold air.

[0060] Having described various embodiments of the disclosure above, the descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical application, or technical improvement in the art, or to enable other ordinary skilled persons in the art to understand the embodiments disclosed herein.

Claims

1. An electrical control cabinet, characterized in that: include: A cabinet (10) comprises a receiving cavity (101), an air inlet (11) and a plurality of air outlets (12) in communication with the receiving cavity (101), wherein the air inlet (11) is arranged on a side of the cabinet (10), and the plurality of air outlets (12) are arranged on a top of the cabinet (10); a plurality of fans (20) detachably mounted at the plurality of air outlets (12); and A centralized manager (30) is coupled to the cabinet (10) and electrically connected to the plurality of fans (20). The centralized manager (30) is capable of controlling any one of the plurality of fans (20) to operate as a main fan, and is capable of controlling the remaining fans of the plurality of fans (20) to operate as backup fans. The main fan is capable of allowing external air to enter the accommodating cavity (101) through the air inlet (11) and to flow out through the corresponding air outlet (12).

2. The electrical control cabinet according to claim 1, characterized in that: A windshield is provided between two adjacent air outlets (12) to prevent airflow short circuit.

3. The electrical control cabinet according to claim 1, characterized in that: Also includes: The filter (13) is arranged at the air inlet (11) and coupled to the cabinet (10).

4. The electrical control cabinet according to any one of claims 1 to 3, characterized in that: The accommodating cavity (101) comprises a front area (101a) for arranging a plurality of drawer assemblies (40), a middle area (101b) for arranging a busbar (80), and a rear area (101c) for arranging cables; the plurality of air outlets (12) correspond to the front area (101a) and the middle area (101b), and the air inlet (11) is located at the bottom of the cabinet (10).

5. The electrical control cabinet according to claim 4, characterized in that: The drawer assembly (40) includes a motor starter, which is electrically connected to the centralized manager (30).

6. The electrical control cabinet according to claim 5, characterized in that: Also includes: A first temperature detection unit (51) is provided in the motor starter and is electrically connected to the centralized manager (30). The first temperature detection unit (51) is capable of detecting an ambient temperature value in the motor starter and generating a first temperature signal, so that the centralized manager (30) controls the operation of the plurality of fans (20) based at least on the first temperature signal.

7. The electrical control cabinet according to claim 5, characterized in that: Also includes: A second temperature detection unit (52) is provided in the middle area (101b) and is electrically connected to the centralized manager (30). The second temperature detection unit (52) is capable of detecting the temperature value of the busbar (80) and generating a second temperature signal, so that the centralized manager (30) controls the operation of the plurality of fans (20) based at least on the second temperature signal.

8. The electrical control cabinet according to any one of claims 1 to 3 and 5 to 7, characterized in that: Also includes: A current detection unit (53) is coupled to the power supply circuit (90) of the fan (20) and is electrically connected to the centralized manager (30). The current detection unit (53) is capable of detecting the current value of the power supply circuit (90) and generating a current detection signal, so that the centralized manager (30) controls the operation of the plurality of fans (20) based at least on the current detection signal.

9. The electrical control cabinet according to claim 4, characterized in that: The air inlet (11) comprises a first air inlet (11a) located at the front side of the cabinet (10), an air duct (14) communicating with the first air inlet (11a) is provided at the bottom of the cabinet (10), and the cabinet (10) comprises: A first bottom plate (61) is arranged between the air duct (14) and the front area (101a), and includes a plurality of first through holes (610) passing through the first bottom plate (61), and the front area (101a) can be connected to the air duct (14) via the plurality of first through holes (610).

10. The electrical control cabinet according to claim 9, characterized in that: The air inlet (11) further includes a second air inlet (11b) located at the rear side of the cabinet (10), and the cabinet (10) further includes: a second bottom plate (62) disposed at the bottom of the cabinet (10) and corresponding to the middle area (101b), and comprising a plurality of second through holes (620) penetrating the second bottom plate (62), wherein the middle area (101b) can be in communication with the second air inlet (11b) via the plurality of second through holes (620); and / or A third bottom plate (63) is arranged at the bottom of the cabinet (10) and corresponds to the rear area (101c), and includes a plurality of third through holes (630) passing through the third bottom plate (63), and the rear area (101c) can be connected to the second air inlet (11b) via the plurality of third through holes (630).

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