Three-proofing electrical box structure and air conditioner thereof

Abstract

The utility model discloses a tri-proof electric appliance box structure and an air conditioner thereof, comprising a box cover assembly, the box cover assembly is provided with an air inlet passage communicated with an inner cavity of an electric appliance box, one side of the electric appliance box is provided with a fireproof assembly, and the fireproof assembly is provided with an air outlet passage. Air enters the electric appliance box through the air inlet channel, dissipates heat of components and then is discharged from the air outlet channel. Air enters from the air inlet channel arranged on the box cover assembly and directly reaches the interior of the electric appliance box to dissipate heat of related components, heat transfer between the electric appliance box and the outside in the whole process is achieved by arranging the box cover assembly and the fireproof assembly, efficient heat dissipation is achieved, meanwhile, the box cover assembly can protect the electric appliance box, water is prevented from entering the electric appliance box, and the service life of the electric appliance box is prolonged. The fireproof assembly can isolate flames generated by spontaneous combustion possibly occurring in the electric appliance box while exhausting is achieved, and the fireproof function is achieved; in addition, the electrical box is isolated from the indoor unit cavity, so that the excessive area of a plastic part can be effectively avoided, and related authentication requirements are met.

Description

Technical Field

[0001] The utility model relates to the technical field of air-conditioning electrical appliance boxes, in particular to a three-proof electrical appliance box structure and an air conditioner thereof. Background Art

[0002] The rooftop unit is an integrated air conditioner with an indoor and outdoor unit. Its electrical box is often placed in the indoor unit cavity or the outdoor unit cavity. During operation, the electrical box often dissipates heat through air cooling, liquid cooling and other cooling methods, and opens heat dissipation holes on the walls around it to form air convection and accelerate the discharge of hot air.

[0003] Air conditioners have very strict requirements on the flame retardancy level of electronic components in the electrical box. When the electrical box is placed in the indoor unit cavity, air can enter the electrical box from the indoor unit cavity through the heat dissipation holes. In order to lower the internal temperature of the electrical box, existing air conditioner electrical boxes are provided with vents that directly connect the electrical box to the external environment, resulting in a weakened sealing of the electrical box, resulting in poor fire, insect and moisture resistance of the electrical box. Utility Model Content

[0004] In response to the shortcomings of the existing technology, a three-proof electrical box structure and its air conditioner are proposed, which solves the problem in the existing technology that the electrical box is directly connected to the external environment through a vent hole, which weakens the sealing of the electrical box and thus causes the electrical box to not achieve good fireproof, insect-proof and moisture-proof effects.

[0005] To achieve the above objectives, the present invention proposes the following technologies:

[0006] A triple-proof electrical box structure includes a box cover assembly, the box cover assembly is provided with an air inlet passage connected to the inner cavity of the electrical box, a fireproof assembly is provided on one side of the electrical box, and the fireproof assembly is provided with an air outlet passage. Air enters the interior of the electrical box through the air inlet passage and dissipates heat for components before being discharged from the air outlet passage.

[0007] Furthermore, the air inlet passage includes an air inlet communicating with the outside and a first heat dissipation hole communicating with the inner cavity of the electrical box, and the vertical height of the air inlet is lower than the vertical height of the first heat dissipation hole.

[0008] Furthermore, the box cover assembly includes a box cover and a panel spaced apart from the box cover, the air inlet passage is formed between the box cover and the panel, the air inlet is located on the panel, and the first heat dissipation hole is provided on the box cover.

[0009] Furthermore, a sealing bracket is provided on the box cover, the first heat dissipation holes are located on the inner side of the sealing bracket and are distributed in an array, and the edge of the sealing bracket is tightly fitted with the side surface of the panel.

[0010] Furthermore, a heat dissipation grille fixedly connected to the sealing bracket is provided between the first heat dissipation hole and the air inlet. The air entering the air inlet passage from the air inlet passes through the air holes on the heat dissipation grille and then enters the inner cavity of the electrical box through the first heat dissipation hole.

[0011] Furthermore, the air outlet passage includes a second heat dissipation hole connected to the inner cavity of the electrical box, and an air outlet with an air outlet direction vertically downward. The hot air that completes heat exchange inside the electrical box is discharged from the electrical box through the second heat dissipation hole and is dissipated through the air outlet.

[0012] Furthermore, the fireproof assembly includes a fireproof cover installed on the side panel of the electrical box, the second heat dissipation hole is opened on the side panel and located inside the fireproof cover, and the air outlet is located at the bottom of the fireproof cover.

[0013] Furthermore, the fireproof cover includes a main fireproof panel spaced apart from the side panel, and side fireproof panels are respectively provided on the left and right sides and the top of the main fireproof panel. A fireproof cavity is formed between the main fireproof panel and the side fireproof panels and the side panels, and the bottom of the fireproof cavity is open to form the air outlet.

[0014] Furthermore, a negative pressure cavity is provided on the peripheral side of the electrical box. Negative pressure is generated in the negative pressure cavity to attract external air into the inner cavity of the electrical box through the air inlet passage and then be discharged through the air outlet passage.

[0015] Furthermore, the negative pressure chamber is specifically a condenser chamber, the electrical box is installed in the evaporator chamber, and a pipeline chamber is provided between the evaporator chamber and the condenser chamber. The hot air in the electrical box enters the condenser chamber through the air outlet passage and the pipeline chamber for discharge.

[0016] Furthermore, a first partition is provided between the pipe cavity and the electrical box, a first ventilation grille is installed on the first partition, and the first ventilation grille is arranged corresponding to the air outlet passage; a second partition is provided between the pipe cavity and the condenser cavity, and a second ventilation grille corresponding to the first ventilation grille is installed on the second partition.

[0017] An air conditioner comprises the triple-proof electrical box structure described in any one of the above.

[0018] Compared with the prior art, the comprehensive effects brought by the utility model include:

[0019] In this application, air enters from the air inlet passage provided on the box cover assembly and goes directly to the inside of the electrical box to dissipate heat to related components, while the hot air in the electrical box is discharged through the air outlet passage opened on the fire protection assembly on one side. By arranging the box cover assembly and the fire protection assembly, heat transfer between the electrical box and the outdoors can be achieved throughout the entire process, achieving efficient heat dissipation. At the same time, the box cover assembly can protect the electrical box to prevent water from entering. The fire protection assembly can achieve exhaust and isolate the flames generated by possible spontaneous combustion inside the electrical box to achieve fire protection function. In addition, the electrical box is isolated from the indoor unit cavity, which can effectively avoid the situation where the area of ​​plastic parts exceeds the standard and meet relevant certification requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the utility model;

[0021] Figure 2 This is a schematic diagram of the overall explosion structure of an embodiment of the utility model;

[0022] Figure 3 This is a schematic diagram of the exploded structure of the box cover assembly according to an embodiment of the present utility model;

[0023] Figure 4 This is a schematic diagram of the installation structure of the box cover and the electrical box according to the embodiment of the utility model;

[0024] Figure 5 This is a schematic diagram of the structure of the box cover according to an embodiment of the utility model;

[0025] Figure 6 for Figure 5 Schematic diagram of the local structure;

[0026] Figure 7 This is a rear view schematic diagram of the electrical box structure of an embodiment of the utility model;

[0027] Figure 8 This is a schematic diagram of the installation structure of the electrical box and the rooftop unit according to an embodiment of the present utility model.

[0028] Legend: 1. Electrical box; 2. Air inlet; 3. First heat dissipation vent; 4. Box cover; 5. Panel; 6. Sealing bracket; 7. Heat dissipation grille; 8. Second heat dissipation vent; 9. Fireproof cover; 10. Pipe cavity; 11. First partition; 12. First ventilation grille; 13. Second partition; 14. Second ventilation grille; 15. Condenser cavity; 16. Evaporator cavity; 17. Indoor unit air outlet cavity; 18. Electrical box sealing plate. DETAILED DESCRIPTION

[0029] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts are within the scope of protection of the present invention.

[0030] In this document, relational terms such as "first" and "second" are used solely to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. Terms such as "upper," "lower," "left," "right," and "top" indicate positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0031] like Figures 1 to 8 As shown, a three-proof electrical box structure includes a box cover assembly, an air inlet passage connected to the inner cavity of the electrical box 1 is provided on the box cover assembly, a fireproof assembly is provided on one side of the electrical box 1, and an air outlet passage is provided on the fireproof assembly. Air enters the interior of the electrical box 1 through the air inlet passage and dissipates heat for the components before being discharged from the air outlet passage.

[0032] Through the above-mentioned arrangement, air enters from the air inlet passage provided on the box cover assembly and directly reaches the interior of the electrical box 1 to dissipate heat to related components, while the hot air in the electrical box 1 is discharged through the air outlet passage opened on the fireproof assembly on one side. By arranging the box cover assembly and the fireproof assembly, heat transfer between the electrical box 1 and the outdoors can be achieved throughout the process, achieving efficient heat dissipation. At the same time, the box cover assembly can protect the electrical box 1 to prevent water from entering. While achieving exhaust, the fireproof assembly can isolate the flames generated by possible spontaneous combustion inside the electrical box 1 to achieve a fireproof function. In addition, the electrical box is isolated from the indoor unit cavity, which can effectively avoid the situation where the area of ​​plastic parts exceeds the standard and meet relevant certification requirements.

[0033] In the triple-proof electrical box structure of this embodiment, the air inlet passage includes an air inlet 2 communicating with the outside and a first heat dissipation hole 3 communicating with the inner cavity of the electrical box 1 . The vertical height of the air inlet 2 is lower than the vertical height of the first heat dissipation hole 3 .

[0034] Through the above-mentioned arrangement, it is ensured that the outside air enters the air inlet passage through the air inlet 2 and flows upward, and then enters the inner cavity of the electrical box 1 through the first heat dissipation hole 3, thereby dissipating heat to the internal components. The air inlet 2 and the first heat dissipation hole 3 are arranged to be staggered, and the air inlet 2 is positioned lower than the first heat dissipation hole 3 to ensure that water will not be sucked into the electrical box 1, thereby realizing the waterproof function of the box cover assembly.

[0035] In the triple-proof electrical box structure of this embodiment, the box cover assembly includes a box cover 4 and a panel 5 spaced apart from the box cover 4. An air inlet passage is formed between the box cover 4 and the panel 5. The air inlet 2 is located on the panel 5, and the first heat dissipation hole 3 is provided on the box cover 4.

[0036] Specifically, a panel 5 is provided on the outside of the cover 4 of the electrical box 1 to form a double-layer staggered air inlet passage. Through the above structure, air is drawn into the electrical box 1 from the outside. The staggered air inlets of the side panels and the electrical box cover are designed to effectively prevent the problem of water ingress due to rain, and to prevent the flames from spreading outward when a fire occurs inside the electrical box 1 due to a malfunction.

[0037] In the prior art, the electrical box 1 was originally placed as a whole in the return air cavity, with heat dissipation holes opened on the side wall, and the airflow in the return air cavity was used to dissipate heat inside the electrical box 1. Air conditioners exported to North America have very strict requirements on the flame retardancy level of electronic components in the electrical box 1. In order to meet the UL60335 certification requirements: the area of ​​non-5VA materials in the air duct is limited, the electrical box 1 must be placed in a separate independent space and cannot be connected to the return air cavity, which will result in the inability to dissipate heat with the help of the airflow in the return air cavity.

[0038] The overall layout of the rooftop unit in this embodiment is as follows Figure 8 As shown, the left side is the indoor unit and the right side is the outdoor unit. The indoor unit is divided into two cavities, namely the indoor unit air outlet cavity 17 above and the outdoor unit return air cavity below. The electrical box 1 is located in the indoor unit return air cavity. Figure 7 As shown, an electrical box sealing plate 18 is provided at the rear of the electrical box 1 to separate an independent space, which is mainly used to connect the electrical box 1 and the outdoor unit, so that the internal space of the electrical box 1 is connected to the outdoor cavity and separated from the indoor cavity, so that the electrical box 1 can transfer heat with the outdoors throughout the whole process while being isolated from the indoor unit cavity, which can not only achieve efficient heat dissipation, but also effectively avoid the situation where the area of ​​plastic parts exceeds the standard (UL60335), meeting the certification requirements.

[0039] Preferably, the electrical box 1 can also be directly installed on the outdoor unit. This patent provides an effective electrical box layout when the space layout is limited and the indoor space is relatively ample.

[0040] In the triple-proof electrical box structure of this embodiment, a sealing bracket 6 is provided on the box cover 4, the first heat dissipation holes 3 are located on the inner side of the sealing bracket 6 and are distributed in an array, and the edge of the sealing bracket 6 is tightly fitted with the side of the panel 5.

[0041] Specifically, a circle of sealing bracket 6 is welded to the top of the front of the box cover 4. When the panel 5 is assembled, it fits tightly with the sealing bracket 6, so that a cavity with a certain degree of sealing is formed between the panel 5, the box cover 4 and the sealing bracket 6, thereby facilitating the circulation of air between the air inlet 2 and the first heat dissipation hole 3, ensuring that the airflow entering from the air inlet 2 will only enter the interior of the electrical box 1.

[0042] In the triple-proof electrical box structure of this embodiment, a heat dissipation grille 7 fixedly connected to a sealing bracket 6 is provided between the first heat dissipation hole 3 and the air inlet 2. The air entering the air inlet passage from the air inlet 2 passes through the air holes on the heat dissipation grille 7 and then enters the inner cavity of the electrical box 1 through the first heat dissipation hole 3.

[0043] Specifically, the heat dissipation grille 7 is installed between the box cover 4 and the panel 5, and a shutter is set on the outermost side panel of the whole machine to form an air inlet 2. The shutter is located lower than the heat dissipation grille 7 and the first heat dissipation hole 3, but higher than the bottom edge of the sealing bracket 6, ensuring that the air inlet 2 is connected with the sealed cavity inside the sealing bracket 6. Due to the height difference design and the shielding of the heat dissipation grille 7, external rainwater does not spread upward under the action of gravity, and rainwater will not be sucked into the electrical box 1 on rainy days, further improving the waterproof effect of the electrical box 1.

[0044] Specifically, the shutters are the best embodiment for ventilation and can be replaced by some sheet metal parts with a downward tilt angle.

[0045] By setting the height difference and the heat dissipation grille 7, when a fault occurs and a fire occurs inside the electrical box 1, the flame will at most escape from the first heat dissipation hole 3. Due to the heat, the flame will not escape downward, and the heat dissipation grille 7 will block it, preventing the flame from spreading to the outside of the electrical box 1, thereby achieving good fire prevention function.

[0046] Preferably, Figure 6 As shown, the longitudinal section of the heat dissipation grille 7 is Z-shaped, and its side close to the box cover 4 is fixed to the box cover 4 by screws, and its other side is in contact with the inner surface of the panel 5. A plurality of square notches are provided on the horizontal baffle in the middle of the heat dissipation grille 7 for easy ventilation, and at the same time, the baffle blocks rain or flames.

[0047] Preferably, there is no specific numerical requirement for the height difference between the heat dissipation grille 7 and the first heat dissipation hole 3, and between the heat dissipation grille 7 and the shutter, and they can be adjusted accordingly according to the specific waterproof level.

[0048] The electrical box 1 of this embodiment is placed in the evaporator cavity 16 of the indoor unit. Compared with the worse situation of being placed in the external fan hole opened in the top cover of the condenser cavity 15, the electrical box 1 inside the evaporator cavity 16 can be completely protected from rain. The main source of water ingress is the shutters on the panel 5. Normally, rain falls from top to bottom and will not enter the electrical box 1. The IP44 requirement is relatively strict. The test needs to meet the requirement that when water is sprayed from bottom to top, there is still no water in the electrical box 1 to be qualified. Figure 1 It can be seen that when water passes through the louvers on the panel 5 from bottom to top, it will be blocked by the Z-shaped heat dissipation grille 7. Of course, the square notch on the heat dissipation grille 7 also poses a risk of water ingress. Here, since the heat dissipation grille 7 and the louvers on the panel 5 and the first heat dissipation hole 3 are designed with a certain height difference, at a sufficient height, rainwater cannot spray into the electrical box 1; the first heat dissipation hole 3 on the electrical box 1 is set as a circular hole of φ3. This specification of circular hole has prevented most insects from entering, thereby achieving an insect-proof effect and realizing the three-proof electrical box structure required by this application: fireproof, waterproof and insect-proof.

[0049] Preferably, the diameter of the heat dissipation hole can be any specification below φ3.

[0050] In the triple-proof electrical box structure of this embodiment, the air outlet passage includes a second heat dissipation hole 8 connected to the inner cavity of the electrical box 1, and an air outlet with the air outlet direction vertically downward. The hot air that completes heat exchange inside the electrical box 1 is discharged from the electrical box 1 through the second heat dissipation hole 8 and is dissipated through the air outlet.

[0051] The above arrangement limits the direction of the air outlet passage to ensure smooth discharge of hot air in the electrical box 1. If the electrical box 1 spontaneously combusts, the flame will be blocked after passing through the second heat dissipation hole 8, thereby suppressing the flame and preventing it from overflowing.

[0052] Preferably, three groups of second heat dissipation holes 8 are arranged in the vertical direction along the side panel of the electrical box 1, and are distributed in an array shape, so as to cover most of the height of the electrical box 1, so that the air can evenly dissipate heat inside the electrical box 1 when it is discharged from the second heat dissipation holes 8; each aperture of the second heat dissipation holes 8 is φ3, which prevents most insects from entering, thereby achieving an insect-proof effect.

[0053] In the triple-proof electrical box structure of this embodiment, the fireproof component includes a fireproof cover 9 installed on the side panel of the electrical box 1, the second heat dissipation hole 8 is opened on the side panel and located inside the fireproof cover 9, and the air outlet is located at the bottom of the fireproof cover 9.

[0054] A fireproof cover 9 is provided. If the electrical box 1 spontaneously combusts, the flame will hit the inner side of the fireproof cover 9 through the second heat dissipation hole 8, thereby putting out the fire. At the same time, the fireproof cover 9 has a certain shielding effect on the second heat dissipation hole 8 and can play a sealing role to a certain extent. The fireproof cover 9 is made of fireproof material.

[0055] By designing air outlet and heat dissipation holes on the side wall of the electrical box 1 and cooperating with the fireproof cover 9, it can ensure that the airflow takes away the heat inside the electrical box 1 and prevent the flame inside the electrical box 1 from spreading outward in the event of a fault.

[0056] In the three-proof electrical box structure of this embodiment, the fireproof cover 9 includes a main fireproof panel spaced apart from the side panel, and side fireproof panels are respectively provided on the left and right sides and the top of the main fireproof panel. A fireproof cavity is formed between the main fireproof panel and the side fireproof panels and the side panels, and the bottom of the fireproof cavity is open to form the air outlet.

[0057] Specifically, the fireproof cover 9 forms a fireproof cavity by fitting the main fireproof plate and the side fireproof plate with the side plate of the electrical box 1 to suppress the flame passing through the second heat dissipation hole 8 to achieve fire prevention.

[0058] In the triple-proof electrical box structure of this embodiment, a negative pressure cavity is provided on the periphery of the electrical box 1. Negative pressure is generated in the negative pressure cavity to attract external air into the inner cavity of the electrical box 1 through the air inlet passage and then be discharged through the air outlet passage.

[0059] Specifically, the negative pressure chamber is the condenser chamber 15 of the outdoor unit. When the axial flow fan in the condenser chamber 15 is running, negative pressure is generated, and the following air flow is finally formed: the ambient air enters the air inlet passage through the panel 5 and the air inlet 2 of the electrical box cover and further enters the electrical box 1, flows out from the second heat dissipation hole 8 on the side of the electrical box 1, takes away the internal heat, and is then discharged through the condenser chamber 15 by the axial flow fan.

[0060] In the triple-proof electrical box structure of this embodiment, the electrical box 1 is installed in the evaporator cavity 16, and a pipe cavity 10 is provided between the evaporator cavity 16 and the condenser cavity 15. The hot air in the electrical box 1 passes through the air outlet passage through the pipe cavity 10 and then enters the condenser cavity 15 for discharge.

[0061] The components of the electrical box 1 are placed in the evaporator cavity, while avoiding the openings from being connected to the evaporator cavity. The air outlet passage structure is designed to be connected to the condenser cavity, and the negative pressure of the condenser cavity is used to draw air into the electrical box 1 and discharge it to achieve heat dissipation.

[0062] Specifically, the side panel with the second heat dissipation hole 8 is perpendicular to the box cover 4, the electrical box sealing plate 18 is installed between the box cover 4 and the outer wall of the pipeline cavity 10, and the fireproof cover 9 is located in the cavity between the electrical box sealing plate 18 and the box cover 4 and the side wall of the pipeline cavity 10; the pipeline cavity 10 is set for installing system components such as compressors, gas separators, and four-way valves.

[0063] In the triple-proof electrical box structure of this embodiment, a first partition 11 is provided between the pipeline cavity 10 and the electrical box 1, and a first ventilation grille 12 is installed on the first partition 11. The first ventilation grille 12 is provided corresponding to the air outlet passage. A second partition 13 is provided between the pipeline cavity 10 and the condenser cavity 15, and a second ventilation grille 14 corresponding to the first ventilation grille 12 is installed on the second partition 13.

[0064] A first partition 11 is provided to separate the electrical box 1 , and a first ventilation grille 12 corresponds to the air outlet position at the bottom of the fireproof cover 9 , so as to absorb the hot air inside the electrical box 1 .

[0065] Through the above structure, air enters from the shutters of the panel 5, passes through the heat dissipation grille 7 and the first heat dissipation hole 3 on the electrical box cover, and directly reaches the interior of the electrical box 1 to dissipate heat to related components, while the hot air in the electrical box 1 is discharged through the second heat dissipation hole 8 on the right. The discharged hot air passes through the first ventilation grille 12 and enters the pipe cavity 10 under the negative pressure formed by the condenser cavity 15 (rotation of the external fan), and enters the condenser cavity 15 through the second ventilation grille 14, and is finally discharged to the outside. The electrical box 1 transfers heat with the outside throughout the whole process and is isolated from the indoor unit cavity, which can not only achieve efficient heat dissipation, but also effectively avoid the situation where the plastic part area exceeds the standard (UL60335), meeting the certification requirements.

[0066] On the other hand, the present application also proposes an air conditioner, including a three-proof electrical box structure described in any of the above embodiments. It can be expected that the air conditioner in the present application includes all the beneficial effects of the three-proof electrical box structure in the above embodiments, which will not be repeated here.

[0067] In the present invention, unless otherwise clearly stipulated and limited, the terms "installation", "setting", "connection", "fixation", "rotation" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0068] Although the embodiments of the present invention have been shown and described in detail, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A triple-proof electrical box structure, characterized in that: It includes a box cover assembly, which is provided with an air inlet passage connected to the inner cavity of the electrical box. A fire protection assembly is provided on one side of the electrical box, and an air outlet passage is provided on the fire protection assembly. Air enters the interior of the electrical box through the air inlet passage and dissipates heat for components before being discharged from the air outlet passage.

2. The triple-proof electrical box structure according to claim 1, characterized in that: The air inlet passage includes an air inlet communicating with the outside world and a first heat dissipation hole communicating with the inner cavity of the electrical box. The vertical height of the air inlet is lower than the vertical height of the first heat dissipation hole.

3. The triple-proof electrical box structure according to claim 2, characterized in that: The box cover assembly includes a box cover and a panel spaced apart from the box cover, the air inlet passage is formed between the box cover and the panel, the air inlet is located on the panel, and the first heat dissipation hole is provided on the box cover.

4. The triple-proof electrical box structure according to claim 3, characterized in that: The box cover is provided with a sealing bracket, the first heat dissipation holes are located on the inner side of the sealing bracket and are distributed in an array, and the edge of the sealing bracket is tightly fitted with the side surface of the panel.

5. The triple-proof electrical box structure according to claim 4, characterized in that: A heat dissipation grille fixedly connected to the sealing bracket is provided between the first heat dissipation hole and the air inlet. The air entering the air inlet passage from the air inlet passes through the air holes on the heat dissipation grille and then enters the inner cavity of the electrical box through the first heat dissipation hole.

6. The triple-proof electrical box structure according to claim 1, characterized in that: The air outlet passage includes a second heat dissipation hole connected to the inner cavity of the electrical box, and an air outlet with an air outlet direction vertically downward. The hot air that completes heat exchange inside the electrical box is discharged from the electrical box through the second heat dissipation hole and is dissipated through the air outlet.

7. The triple-proof electrical box structure according to claim 6, characterized in that: The fireproof assembly includes a fireproof cover installed on the side panel of the electrical box, the second heat dissipation hole is opened on the side panel and located inside the fireproof cover, and the air outlet is located at the bottom of the fireproof cover.

8. The triple-proof electrical box structure according to claim 7, characterized in that: The fireproof cover includes a main fireproof panel spaced apart from the side panel, and side fireproof panels are respectively provided on the left and right sides and the top of the main fireproof panel. A fireproof cavity is formed between the main fireproof panel, the side fireproof panels and the side panels, and the bottom of the fireproof cavity is open to form the air outlet.

9. The triple-proof electrical box structure according to claim 1, characterized in that: A negative pressure cavity is provided on the peripheral side of the electrical box. Negative pressure is generated in the negative pressure cavity to attract external air into the inner cavity of the electrical box through the air inlet passage and then be discharged through the air outlet passage.

10. The triple-proof electrical box structure according to claim 9, characterized in that: The negative pressure cavity is specifically a condenser cavity, the electrical box is installed in the evaporator cavity, a pipeline cavity is provided between the evaporator cavity and the condenser cavity, and the hot air in the electrical box enters the condenser cavity through the air outlet passage and the pipeline cavity for discharge.

11. The triple-proof electrical box structure according to claim 10, characterized in that: A first partition is provided between the pipeline cavity and the electrical box, and a first ventilation grille is installed on the first partition. The first ventilation grille is arranged corresponding to the air outlet passage. A second partition is provided between the pipeline cavity and the condenser cavity, and a second ventilation grille corresponding to the first ventilation grille is installed on the second partition.

12. An air conditioner, characterized in that: The invention comprises a triple-proof electrical box structure as described in any one of claims 1 to 11.

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