Control cabinet for coal feeder

Abstract

This utility model relates to the field of cabinet technology, specifically a control cabinet for a coal feeder. It includes a cabinet, a positive pressure dustproof device, a pressure relief device, and a cooling device. The cabinet comprises a cabinet body, an upper cabinet door, a lower cabinet door, and partitions. The cabinet body has a box-shaped structure with an opening facing forward. A horizontally positioned partition is located on the inner upper part of the cabinet body. An upper cabinet door is located on the front side of the cabinet above the partition, and a lower cabinet door is located on the front side of the cabinet below the partition. This utility model features a reasonable and compact structure, is easy to use, and maintains a higher air pressure difference inside the cabinet than the external environment through the positive pressure dustproof device, forming a one-way airflow barrier to effectively prevent the intrusion of pollutants such as coal dust and water mist. The pressure relief device automatically releases pressure when the air pressure inside the cabinet is too high. The cooling device dissipates heat and cools the cabinet, providing stable, efficient, and effective dustproof performance.

Description

Technical Field

[0001] This utility model relates to the field of cabinet technology and is a control cabinet for a coal feeder. Background Technology

[0002] The coal feeder control cabinet is an indispensable piece of equipment in a thermal power plant. It acts as the "brain" of the coal feeder system, responsible for the centralized management of electrical control and protection equipment. By precisely controlling the starting, stopping, and operation of the motors, it ensures the stable and efficient operation of the coal feeder equipment, continuously supplying fuel to the boiler. The control cabinet is also equipped with various protection functions, such as overload protection, short-circuit protection, and overheat protection, acting like an "armor" to ensure its safe operation.

[0003] Because coal feeder control cabinets are typically installed in harsh environments with high levels of coal dust, fine coal dust can easily enter the cabinet through the ventilation holes, adhere to electrical components, and cause electrical malfunctions, even leading to feeder shutdowns. Furthermore, during the cleaning of surrounding machinery, splashes from high-pressure water jets can also enter the control cabinet, causing electrical faults. Therefore, coal feeder control cabinets must be equipped with advanced heat dissipation, dust removal, and protection systems to ensure the long-term stable operation of electrical components and guarantee the safe and efficient production of thermal power plants.

[0004] In existing technologies, some coal feeder control cabinets employ a method of distributing heat dissipation and dust removal devices vertically on the sides of the casing. These devices achieve heat dissipation and dust removal through a combination of components such as rainproof ventilation baffles, axial flow fans, and dust filters. The axial flow fan of the upper heat dissipation and dust removal device blows hot air out of the cabinet. Under the negative pressure inside the cabinet, cool external air enters the cabinet from the lower heat dissipation and dust removal device, where it is blocked by the dust filter, preventing fine coal ash from escaping. The axial flow fan of the lower heat dissipation and dust removal device cycles on at intervals, blowing away fine coal ash from the dust filter and maintaining unobstructed airflow.

[0005] However, due to the high dust levels in the working environment of the coal feeder control cabinet, fine coal ash and other dust particles easily adhere to the dustproof screen, necessitating frequent operation of the lower axial fan. However, operating the lower axial fan affects airflow within the cabinet, thus impacting heat dissipation. Furthermore, existing control cabinets often lack effective waterproofing measures, failing to withstand splashes from high-pressure water jet cleaning, which can easily lead to electrical malfunctions. Therefore, there is an urgent need for a simple, dustproof, and heat-dissipating local control cabinet for the coal feeder, with a certain degree of heat dissipation capability, to adapt to harsh working environments and ensure the safe and efficient production of thermal power plants. Summary of the Invention

[0006] This utility model provides a control cabinet for a coal feeder, which overcomes the shortcomings of the prior art and can effectively solve the problems of poor dust prevention and heat dissipation of existing coal feeder control cabinets.

[0007] The technical solution of this utility model is achieved through the following measures: A control cabinet for a coal feeder includes a cabinet, a positive pressure dustproof device, a pressure relief device, and a cooling device. The cabinet includes a cabinet body, an upper cabinet door, a lower cabinet door, and a partition. The cabinet body has a box-shaped structure with an opening facing forward. A horizontally arranged partition is provided on the inner side of the upper part of the cabinet body. An upper cabinet door is provided on the front side of the cabinet body corresponding to the position above the partition, and a lower cabinet door is provided on the front side of the cabinet body corresponding to the position below the partition. An air inlet is provided on the lower rear side of the cabinet body, and an air outlet is provided on the upper cabinet door. A positive pressure dustproof device capable of supplying air into the cabinet body is provided at the air inlet. A vertically penetrating mounting hole is provided on the partition, and a pressure relief device is provided on the partition corresponding to the mounting hole position. A cooling device is provided at the rear of the cabinet body.

[0008] The following are further optimizations and / or improvements to the above-mentioned utility model technical solution:

[0009] The aforementioned positive pressure dustproof device may include an air inlet pipeline, an air pump, and an air source pipeline. An air inlet pipeline is provided on the rear side of the cabinet corresponding to the air inlet position. The air inlet end of the air inlet pipeline is fixedly connected to the air outlet end of the air pump, and the air inlet end of the air pump is fixedly connected to the air source pipeline.

[0010] The aforementioned positive pressure dustproof device may also include an air source dryer, with an air source dryer installed on the air inlet pipeline.

[0011] The aforementioned pressure relief device may include an air outlet duct, a mounting plate, a sealing plate, an upper adjusting plate, a lower adjusting plate, springs, adjusting screws, guide rods, and a filter screen. An air outlet duct is fixedly installed on the upper side of the partition corresponding to the mounting hole position. A mounting plate is fixedly installed on the upper side of the partition corresponding to the outer position of the air outlet duct. The mounting plate is U-shaped with its opening facing downwards. Filter screens are fixedly installed on the front and rear sides of the mounting plate, respectively. An adjusting screw hole is provided in the center of the upper side of the mounting plate, and an adjusting screw is fixedly installed in the adjusting screw hole via a threaded connection. An upper adjusting plate is fixedly installed on the outer side of the adjusting screw corresponding to the position above the mounting plate. A lower adjusting plate is provided above the air outlet duct. Several guide holes are provided on the upper side of the mounting plate corresponding to the position between the upper and lower adjusting plates. A guide rod is provided in each guide hole. The upper end of the guide rod is fixedly installed with the corresponding position on the lower side of the upper adjusting plate, and the lower end of the guide rod is fixedly installed with the corresponding position on the upper side of the lower adjusting plate. A sealing plate capable of sealing the air outlet duct is provided on the upper side of the air outlet duct. Several springs are fixedly installed between the lower adjusting plate and the sealing plate.

[0012] The aforementioned cooling device may include cooling pipes and heat dissipation pipes. A water inlet and a water outlet are respectively provided on the lower rear side of the cabinet. A heat dissipation pipe is provided on the rear side of the cabinet. The water outlet end of the heat dissipation pipe is installed in the water inlet, and the water inlet end of the heat dissipation pipe is installed in the water outlet. A cooling pipe is provided on the front rear side of the cabinet. The water inlet end of the cooling pipe is fixedly connected to the water outlet end of the heat dissipation pipe, and the water outlet end of the cooling pipe is fixedly connected to the water inlet end of the heat dissipation pipe.

[0013] The aforementioned cooling device may also include a heat dissipation plate and a water pump. The cooling pipe and the heat dissipation pipe are both serpentine bends. The serpentine bend is composed of at least two straight pipes connected end to end by at least one U-shaped bend. Several heat dissipation plates are spaced apart from top to bottom on the outside of the heat dissipation pipe. A water pump is fixedly connected to the heat dissipation pipe.

[0014] The above may also include an air vent grille and an observation window. An air vent grille is provided on the upper cabinet door corresponding to the air vent position; an observation opening is provided on the lower cabinet door, and an observation window is provided on the lower cabinet door corresponding to the observation opening position.

[0015] This utility model has a reasonable and compact structure and is easy to use. By setting a positive pressure dustproof device, it maintains an air pressure difference inside the cabinet that is higher than that of the external environment, forming a one-way airflow barrier to effectively block pollutants such as coal dust and water mist from entering. By setting a pressure relief device, it can automatically release pressure when the air pressure inside the cabinet is too high. By setting a cooling device, it can achieve heat dissipation and cooling of the cabinet, and has the characteristics of stability, high efficiency and good dustproof effect. Attached Figure Description

[0016] Appendix Figure 1 These are schematic diagrams of the main cross-sectional structure of embodiments 1 to 7 of this utility model.

[0017] Appendix Figure 2 For the appendix Figure 1 A magnified structural diagram of point A in the middle.

[0018] Appendix Figure 3 For the appendix Figure 1 Schematic diagram of three-dimensional structure Figure 1 .

[0019] Appendix Figure 4 For the appendix Figure 1 Schematic diagram of three-dimensional structure Figure 2 .

[0020] The codes in the attached diagram are as follows: 1 is the cabinet, 2 is the upper cabinet door, 3 is the lower cabinet door, 4 is the partition, 5 is the air inlet, 6 is the air inlet pipeline, 7 is the air pump, 8 is the air source pipeline, 9 is the air source dryer, 10 is the air outlet, 11 is the mounting plate, 12 is the sealing plate, 13 is the upper adjusting plate, 14 is the lower adjusting plate, 15 is the spring, 16 is the adjusting screw, 17 is the guide rod, 18 is the filter screen, 19 is the cooling pipe, 20 is the heat dissipation pipe, 21 is the heat dissipation plate, 22 is the water pump, 23 is the air outlet grille, and 24 is the observation window. Detailed Implementation

[0021] This utility model is not limited to the following embodiments, and the specific implementation method can be determined according to the technical solution of this utility model and the actual situation.

[0022] In this utility model, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as front, back, top, bottom, left, right, etc. The positional relationships are determined based on the layout direction of the attached diagram in the instruction manual.

[0023] The present invention will be further described below with reference to the embodiments and accompanying drawings:

[0024] Example 1: As shown in the attached document Figure 1 , 2 As shown in Figures 3 and 4, the control cabinet for the coal feeder includes a cabinet, a positive pressure dustproof device, a pressure relief device, and a cooling device. The cabinet includes a cabinet body 1, an upper cabinet door 2, a lower cabinet door 3, and a partition 4. The cabinet body 1 has a box-shaped structure with an opening facing forward. The upper inner side of the cabinet body 1 is provided with a horizontally arranged partition 4. The upper cabinet door 2 is provided on the front side of the cabinet body 1 corresponding to the position above the partition 4, and the lower cabinet door 3 is provided on the front side of the cabinet body 1 corresponding to the position below the partition 4. An air inlet 5 is provided on the lower rear side of the cabinet body 1, and an air outlet is provided on the upper cabinet door 2. A positive pressure dustproof device that can supply air into the cabinet body 1 is provided at the air inlet 5. The partition 4 is provided with vertically penetrating mounting holes. A pressure relief device is provided on the partition 4 corresponding to the mounting hole positions. A cooling device is provided at the rear of the cabinet body 1. During use, by setting up a positive pressure dustproof device, the air pressure difference inside the cabinet is maintained higher than that of the external environment, forming a one-way airflow barrier to effectively block pollutants such as coal dust and water mist from entering; by setting up a pressure relief device, the pressure inside the cabinet can be automatically released when the air pressure is too high; by setting up a cooling device, the cabinet can be cooled down; by setting up a partition 4, the interior of the cabinet 1 is divided into an upper pressure relief chamber and a lower control chamber.

[0025] The control cabinet for the coal feeder can be further optimized and / or improved according to actual needs:

[0026] Example 2: As shown in the attached document Figure 1 , 2As shown in Figures 3 and 4, the positive pressure dustproof device includes an air inlet pipeline 6, an air pump 7, and an air source pipeline 8. The air inlet pipeline 6 is provided on the rear side of the cabinet 1 corresponding to the position of the air inlet 5. The air inlet end of the air inlet pipeline 6 is fixedly connected to the air outlet end of the air pump 7, and the air source pipeline 8 is fixedly connected to the air inlet end of the air pump 7. During use, when maintaining positive pressure for dust prevention using the air pump 7, a stable air pressure barrier is formed by continuously injecting clean air. Compared with the axial flow fan solution, this has a more fundamental difference in dust prevention mechanism. The air pump 7 can actively build a unidirectional airflow channel, preventing external pollutants from penetrating the sealed interface. In contrast, the axial flow fan mainly relies on mechanical filtration and airflow disturbance to achieve dust prevention, which is prone to filter penetration when the dust concentration changes abruptly. In addition, the air pump 7 can also achieve dynamic balance through pressure sensing and intelligent control system, which not only avoids poor electrical contact caused by dust infiltration, but also prevents mechanical stress on internal components due to air pressure fluctuations. Its structural design is more suitable for the characteristics of frequent start-stop operation, and there is no need to set up a complex multi-layer filtration device, which significantly reduces maintenance complexity.

[0027] Example 3: As shown in the attached document Figure 1 , 2 As shown in Figures 3 and 4, the positive pressure dustproof device also includes an air source dryer 9, which is installed on the air inlet pipeline 6. During use, by employing the air pump 7 and the air source dryer 9 in tandem, a dual purification mechanism is achieved to construct a more comprehensive protection system. The compressed air output by the air pump 7 is deeply dehumidified by the dryer, effectively eliminating water vapor and oil impurities in the air source, giving the air entering the cabinet 1 moisture-proof and corrosion-proof properties, avoiding problems such as circuit board oxidation and terminal corrosion caused by compressed air condensation in traditional solutions. In addition, the clean air source after drying maintains the positive pressure barrier while neutralizing the static charge on the surface of coal dust particles, reducing the dust adsorption rate, preventing the filter from becoming clogged and failing due to electrostatic dust accumulation, and significantly reducing system failures caused by environmental erosion.

[0028] Example 4: As shown in the appendix Figure 1 , 2As shown in Figures 3 and 4, the pressure relief device includes an air outlet duct 10, a mounting plate 11, a sealing plate 12, an upper adjusting plate 13, a lower adjusting plate 14, a spring 15, an adjusting screw 16, a guide rod 17, and a filter screen 18. The air outlet duct 10 is fixedly installed on the upper side of the partition 4 corresponding to the mounting hole position, and the mounting plate 11 is fixedly installed on the upper side of the partition 4 corresponding to the outer position of the air outlet duct 10. The mounting plate 11 is U-shaped with its opening facing downwards. Filter screens 18 are fixedly installed on the front and rear sides of the mounting plate 11, respectively. An adjusting screw hole is provided in the center of the upper side of the mounting plate 11, and an adjusting screw 16 is fixedly installed in the adjusting screw hole through a threaded connection. An upper adjusting plate 13 is fixedly installed on the outside of the adjusting screw 16 above the plate 11. A lower adjusting plate 14 is provided above the air outlet duct 10. A number of guide holes are provided on the upper side of the mounting plate 11 corresponding to the position between the upper adjusting plate 13 and the lower adjusting plate 14. A guide rod 17 is provided in each guide hole. The upper end of the guide rod 17 is fixedly installed together with the corresponding position on the lower side of the upper adjusting plate 13. The lower end of the guide rod 17 is fixedly installed together with the corresponding position on the upper side of the lower adjusting plate 14. A sealing plate 12 that can block the air outlet duct 10 is provided on the upper side of the air outlet duct 10. A number of springs 15 are fixedly installed between the lower adjusting plate 14 and the sealing plate 12. During use, the preload of the spring 15 is adjusted by rotating the adjusting screw 16, thereby adjusting the pressure relief value. The upper outlet of the air duct 10 is blocked by the sealing plate 12, and the positive pressure environment inside the cabinet 1 is maintained under the action of the spring 15. When the pressure inside the cabinet 1 is too high, the gas pushes up the sealing plate 12 and automatically completes the pressure relief. By setting the filter screen 18, dust in the environment is prevented from entering the lower control compartment of the cabinet 1 during the pressure relief process.

[0029] Example 5: As shown in the attached document Figure 1 , 2 As shown in Figures 3 and 4, the cooling device includes a cooling pipe 19 and a heat dissipation pipe 20. A water inlet and an outlet are respectively provided on the lower rear side of the cabinet 1. A heat dissipation pipe 20 is located on the rear side of the cabinet 1, with its outlet end installed in the water inlet and its inlet end installed in the water outlet. A cooling pipe 19 is located on the front rear side of the cabinet 1, with its inlet end and outlet end fixedly connected. During use, the closed-loop water cooling system, consisting of the built-in cooling pipe 19 and the external heat dissipation pipe 20, utilizes the efficient heat conduction characteristics of the liquid medium to achieve directional heat transfer and gradient release, effectively improving the heat dissipation effect of the cabinet.

[0030] Example 6: As attached Figure 1 , 2As shown in Figures 3 and 4, the cooling device also includes a heat dissipation plate 21 and a water pump 22. The cooling pipe 19 and the heat dissipation pipe 20 are both serpentine bends. The serpentine bend is composed of at least two straight pipes connected end to end by at least one U-shaped bend. Several heat dissipation plates 21 are spaced apart from top to bottom on the outside of the heat dissipation pipe 20. The water pump 22 is fixedly connected to the heat dissipation pipe 20. During use, the built-in cooling pipe 19 is arranged directly around the core heat-generating element, which greatly improves the heat exchange efficiency by utilizing the molecular-level contact between the liquid and the metal. At the same time, the external heat dissipation pipe 20 forms a composite heat dissipation interface with the natural airflow through the radiant heat dissipation plate 21, avoiding the interaction pollution between the cooling fan and dust in traditional solutions. The circulation system driven by the water pump 22 adopts a physical isolation design, so that the coolant flows only in the closed pipeline, which not only prevents water vapor from seeping into the electrical components, but also avoids the risk of pipeline blockage caused by impurities in open water cooling. In addition, this embodiment can also adjust the circulation flow in real time through the existing known intelligent temperature control module, so as to ensure the heat dissipation requirements while keeping the humidity inside the cabinet within the moisture-proof safety threshold, solving the problem of insulation performance degradation caused by condensate accumulation in traditional water cooling systems.

[0031] Example 7: As attached Figure 1 , 2 As shown in Figures 3 and 4, the cabinet also includes an air outlet grille 23 and an observation window 24. The upper cabinet door 2 at the position of the air outlet is provided with an air outlet grille 23; the lower cabinet door 3 is provided with an observation opening, and the lower cabinet door 3 at the position of the observation opening is provided with an observation window 24. During use, the design of integrating an exhaust grille 23 and an observation window 24 on the upper cabinet door 2 and lower cabinet door 3 respectively achieves an organic unity of functionality and visibility. The exhaust grille 23 adopts a directional airflow structure, which guides the depressurized airflow along a preset path to discharge while maintaining a positive pressure environment inside the cabinet. This avoids dust backflow with the airflow and prevents turbulence from interfering with the equipment layout during heat dissipation. The observation window 24 is made of anti-static tempered glass with embedded sealing strips. While ensuring the visibility of the internal components, it forms a physical isolation barrier, allowing operators to monitor instrument indications, indicator light status, and potential anomalies in real time without frequently opening the cabinet door. This significantly reduces the problem of blurred observation window 24 caused by environmental dust intrusion. Therefore, the synergistic effect of the two enhances the environmental adaptability of the cabinet 1 and optimizes the efficiency of human-machine interaction, enabling equipment maintenance to shift from passive response to proactive prevention.

[0032] The above technical features constitute the preferred embodiment of this utility model, which has strong adaptability and the best implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A control cabinet for a coal feeder, characterized in that The system includes a cabinet, a positive pressure dustproof device, a pressure relief device, and a cooling device. The cabinet consists of a cabinet body, an upper cabinet door, a lower cabinet door, and partitions. The cabinet body has a box-shaped structure with an opening facing forward. The upper inner side of the cabinet body has horizontally arranged partitions. The upper cabinet door is located on the front side of the cabinet above the partitions, and the lower cabinet door is located on the front side of the cabinet below the partitions. An air inlet is located on the lower rear side of the cabinet body, and an air outlet is located on the upper cabinet door. A positive pressure dustproof device that can supply air into the cabinet body is located at the air inlet. The partitions have vertically penetrating mounting holes, and pressure relief devices are located on the partitions corresponding to the mounting holes. A cooling device is located at the rear of the cabinet body.

2. The control cabinet for a coal feeder according to claim 1, characterized in that The positive pressure dustproof device includes an air inlet pipeline, an air pump, and an air source pipeline. An air inlet pipeline is provided on the rear side of the cabinet corresponding to the air inlet position. The air inlet end of the air inlet pipeline is fixedly connected to the air outlet end of the air pump, and the air inlet end of the air pump is fixedly connected to the air source pipeline.

3. The control cabinet for a coal feeder according to claim 2, characterized in that The positive pressure dustproof device also includes an air source dryer, which is installed on the air inlet pipeline.

4. The control cabinet for a coal feeder according to claim 1 or 2 or 3, characterized in that The pressure relief device includes an air outlet duct, a mounting plate, a sealing plate, an upper adjusting plate, a lower adjusting plate, springs, an adjusting screw, guide rods, and a filter screen. An air outlet duct is fixedly installed on the upper side of the partition corresponding to the mounting hole position. A mounting plate is fixedly installed on the upper side of the partition corresponding to the outer position of the air outlet duct. The mounting plate is U-shaped with its opening facing downwards. Filter screens are fixedly installed on the front and rear sides of the mounting plate, respectively. An adjusting screw hole is provided in the center of the upper side of the mounting plate, and an adjusting screw is fixedly installed in the adjusting screw hole via a threaded connection. An upper adjusting plate is fixedly installed on the outer side of the adjusting screw corresponding to the position above the mounting plate. A lower adjusting plate is provided above the air outlet duct. Several guide holes are provided on the upper side of the mounting plate corresponding to the position between the upper and lower adjusting plates. A guide rod is provided in each guide hole. The upper end of the guide rod is fixedly installed with the corresponding position on the lower side of the upper adjusting plate, and the lower end of the guide rod is fixedly installed with the corresponding position on the upper side of the lower adjusting plate. A sealing plate capable of sealing the air outlet duct is provided on the upper side of the air outlet duct. Several springs are fixedly installed between the lower adjusting plate and the sealing plate.

5. The control cabinet for a coal feeder according to claim 1 or 2 or 3, characterized in that The cooling device includes cooling pipes and heat dissipation pipes. The lower rear side of the cabinet is provided with water inlet and water outlet. The rear side of the cabinet is provided with heat dissipation pipes. The water outlet end of the heat dissipation pipe is installed in the water inlet, and the water inlet end of the heat dissipation pipe is installed in the water outlet. The front rear side of the cabinet is provided with cooling pipes. The water inlet end of the cooling pipe is fixedly connected to the water outlet end of the heat dissipation pipe, and the water outlet end of the cooling pipe is fixedly connected to the water inlet end of the heat dissipation pipe.

6. The control cabinet for a coal feeder according to claim 4, characterized in that... The cooling device includes cooling pipes and heat dissipation pipes. The lower rear side of the cabinet is provided with water inlet and water outlet. The rear side of the cabinet is provided with heat dissipation pipes. The water outlet end of the heat dissipation pipe is installed in the water inlet, and the water inlet end of the heat dissipation pipe is installed in the water outlet. The front rear side of the cabinet is provided with cooling pipes. The water inlet end of the cooling pipe is fixedly connected to the water outlet end of the heat dissipation pipe, and the water outlet end of the cooling pipe is fixedly connected to the water inlet end of the heat dissipation pipe.

7. The control cabinet for a coal feeder according to claim 5, characterized in that The cooling device also includes heat dissipation plates and a water pump. The cooling pipes and heat dissipation pipes are all serpentine bends. The serpentine bends are composed of at least two straight pipes connected end to end by at least one U-shaped bend. Several heat dissipation plates are spaced apart from top to bottom on the outside of the heat dissipation pipes. A water pump is fixedly connected to the heat dissipation pipes.

8. The control cabinet for a coal feeder according to claim 6, characterized in that The cooling device also includes heat dissipation plates and a water pump. The cooling pipes and heat dissipation pipes are all serpentine bends. The serpentine bends are composed of at least two straight pipes connected end to end by at least one U-shaped bend. Several heat dissipation plates are spaced apart from top to bottom on the outside of the heat dissipation pipes. A water pump is fixedly connected to the heat dissipation pipes.

9. The control cabinet for a coal feeder according to claim 1 or 2 or 3 or 6 or 7 or 8, characterized in that It also includes an air vent grille and an observation window. The upper cabinet door corresponding to the air vent position is equipped with an air vent grille; the lower cabinet door is equipped with an observation opening, and the lower cabinet door corresponding to the observation opening position is equipped with an observation window.

10. The control cabinet for a coal feeder according to claim 5, characterized in that It also includes an air vent grille and an observation window. The upper cabinet door corresponding to the air vent position is equipped with an air vent grille; the lower cabinet door is equipped with an observation opening, and the lower cabinet door corresponding to the observation opening position is equipped with an observation window.

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