Photovoltaic grid-connected box with heat dissipation function

Abstract

The utility model discloses a photovoltaic grid-connected box with a heat dissipation function, comprising a box body, the top of which is fixedly provided with a pinnacle, the interior of which is fixedly provided with a mounting plate, and the two sides of which are provided with an air inlet and an air outlet; the fan assembly is arranged at the top in the box body; the plugging assemblies are symmetrically arranged on the two sides in the box body; the driving assembly is arranged in the box body; the transmission switching assembly is arranged in the box body; the temperature and humidity sensor is arranged on one side of the box body; the controller is arranged in the box body and electrically connected with the driving assembly, the transmission switching assembly and the temperature and humidity sensor. The photovoltaic grid-connected box is good in heat dissipation effect, the air inlet and the air outlet which are used for heat dissipation can be closed in rainy or humid weather, damp air is prevented from entering the box body, safety is high, and the service life of the photovoltaic grid-connected box is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic grid connection boxes, in particular to a photovoltaic grid connection box with a heat dissipation function. Background Technique

[0002] The photovoltaic grid connection box exists in the photovoltaic system as the total outlet of the photovoltaic power station. It is a power distribution device connecting the photovoltaic power station and the power grid, and its main function is to serve as the demarcation point between the photovoltaic power generation system and the power grid. For low-voltage grid-connected photovoltaic power stations, metering, protection and other functional devices can also be installed in the photovoltaic grid connection box.

[0003] There are many electrical components in the photovoltaic grid connection box. When working for a long time, a lot of heat will be generated. Many existing photovoltaic grid connection boxes dissipate heat by opening ventilation openings on the box body. Chinese Patent (CN 219739732U) discloses a heat dissipation type intelligent photovoltaic grid connection box, which realizes the heat dissipation function and avoids the damage of internal components caused by too high internal temperature. However, there are still some problems in the actual use of this photovoltaic grid connection box. Since many photovoltaic grid connection boxes are installed outdoors, when it rains or the humidity is high, the humid air will directly enter the box body through the air inlet, posing a great potential safety hazard. Content of the Utility Model

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is expected to provide a photovoltaic grid connection box with a heat dissipation function, which has good heat dissipation effect, and can close the air inlets and outlets for heat dissipation when it rains or the humidity is high, avoiding the entry of humid air into the box body, with high safety and improving the service life of the photovoltaic grid connection box.

[0005] A photovoltaic grid connection box with a heat dissipation function provided by the utility model includes:

[0006] A box body, on the top of which a closed spire is fixedly arranged, inside which a mounting plate for installing electrical components is fixedly arranged, and on both sides of which air inlets are symmetrically opened near the top, and air outlets are symmetrically opened near the bottom on both sides;

[0007] A fan assembly, arranged at the top inside the box body;

[0008] A plugging assembly, symmetrically arranged on both sides inside the box body, for opening and plugging the air inlets and outlets;

[0009] A driving assembly, arranged inside the box body, for driving the fan assembly to rotate through a transmission switching assembly, or driving the plugging assembly to open or plug the air inlets and outlets through the transmission switching assembly;

[0010] A transmission switching assembly, arranged inside the box body, for transmission switching between the driving assembly and the fan assembly or the plugging assembly;

[0011] A temperature and humidity sensor, arranged on one side of the box body;

[0012] A controller, arranged inside the box body, and electrically connected to the driving component, the transmission switching component and the temperature and humidity sensor respectively.

[0013] Further, a box door is arranged on the front of the box body. One side of the box door is hinged to the box body, and a box lock is arranged between the other side and the box body.

[0014] Further, an observation window is arranged on the box door.

[0015] Further, the fan assembly includes two first shaft rods symmetrically arranged on both sides of the top inside the box body. The top ends of the first shaft rods are rotationally connected to the box body through bearings. A transmission wheel is fixedly sleeved on the first shaft rods. The transmission wheels on the two first shaft rods are connected by a transmission belt. A fan blade is fixedly arranged at the bottom end of the first shaft rod. A first driven gear is fixedly sleeved on any one of the first shaft rods.

[0016] Further, the plugging assembly includes a first plugging plate and a second plugging plate. Vertical bidirectional lead screws are symmetrically arranged on both sides inside the box body. The two ends of the bidirectional lead screw are respectively rotationally connected to the box body through bearings. A first bevel gear is fixedly sleeved at the bottom end of the bidirectional lead screw. The first bevel gear is meshed with a second bevel gear. The two second bevel gears are fixedly connected by a horizontally arranged transmission shaft. The transmission shaft is rotationally connected to the box body through a bearing seat. Sliding grooves are symmetrically arranged on both sides of the inner side wall of the box body at the positions of the air inlet and the air outlet. The first plugging plates slidingly connected to the sliding grooves are arranged below the air inlet. A first sliding sealing ring is fixedly arranged on the first plugging plate. The second plugging plates slidingly connected to the sliding grooves are arranged above the air outlet. A second sliding sealing ring is fixedly arranged on the second plugging plate. A first driving block and a second driving block are symmetrically threadedly connected to the bidirectional lead screw. The first driving block is fixedly connected to the first plugging plate. The second driving block is fixedly connected to the second plugging plate. A second driven gear is fixedly sleeved at the top end of the bidirectional lead screw on the same side as the first driven gear.

[0017] Further, guard nets covering the plugging assembly are respectively fixedly arranged on both sides inside the box body. Avoidance openings are formed in the guard nets corresponding to the transmission switching assembly. A support plate is fixedly arranged at the bottom inside the box body above the transmission shaft.

[0018] Further, the driving assembly includes a driving motor and a driving gear. The driving gear is arranged between the first driven gear and the second driven gear inside the box body. The driving motor is fixedly arranged inside the apex and is in transmission connection with the driving gear.

[0019] Further, the transmission switching assembly includes a swing frame. The swing frame is arranged on the top inside the box body on one side of the driving gear, the first driven gear and the second driven gear. The middle part of the swing frame is rotationally connected to the top inside the box body through a second shaft rod. A first transmission gear is rotatably arranged at one end of the swing frame, and a second transmission gear is rotatably arranged at the other end. An electric telescopic cylinder is arranged between the swing frame and the box body for driving the swing frame to rotate so that the first driven gear meshes with the driving gear and the first driven gear at the same time or the second transmission gear meshes with the driving gear and the second driven gear at the same time.

[0020] Further, the air inlet and the air outlet are respectively composed of a plurality of parallel long holes, and both the air inlet and the air outlet incline downward from the inside to the outside of the box body.

[0021] Further, a containing box is fixedly arranged at the bottom inside the box body. A box cover is detachably arranged on the top of the containing box. Through holes are evenly distributed on the outer wall of the containing box, and activated carbon is arranged inside the containing box.

[0022] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0023] The photovoltaic grid-connected box of the present utility model is provided with a fan assembly, a plugging assembly, a driving assembly, a transmission switching assembly and a temperature and humidity sensor. Under normal circumstances, the fan assembly is in transmission connection with the driving assembly through the transmission switching assembly, and the driving assembly drives the fan assembly to rotate. The air outside the box body enters the box body through the air inlet, and the hot air inside the box body is discharged through the air outlet, effectively reducing the temperature inside the box body and having a good heat dissipation effect. When the temperature and humidity sensor monitors that the humidity outside the box body is too high, the transmission switching assembly operates to disconnect the transmission connection between the fan assembly and the driving assembly and connect the plugging assembly with the driving assembly. At this time, the driving assembly drives the plugging assembly to block the air inlet and the air outlet to prevent the humid air outside the box body from entering the box body, ensuring the safety of the operation of the photovoltaic grid-connected box and improving the service life of the photovoltaic grid-connected box.

[0024] It should be understood that the content described in the utility model content part is not intended to limit the key or important features of the embodiments of the present utility model, nor is it used to limit the scope of the present utility model. Other features of the present utility model will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Other features, objectives, and advantages of the present utility model will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0026] Figure 1 It is a front view structural schematic diagram of a photovoltaic grid-connected box;

[0027] Figure 2 It is a front view sectional structural schematic diagram of a photovoltaic grid-connected box;

[0028] Figure 3 It is a bottom view structural schematic diagram inside a photovoltaic grid-connected box;

[0029] Figure 4 It is a side view structural schematic diagram inside a photovoltaic grid-connected box.

[0030] Reference numerals in the figures: 1, box body; 2, fan assembly; 3, plugging assembly; 4, driving assembly; 5, transmission switching assembly; 6, temperature and humidity sensor; 7, controller; 8, containing box;

[0031] 11, spire; 12, mounting plate; 13, air inlet; 14, air outlet; 15, box door; 16, box lock; 17, observation window; 18, protective net; 19, support plate;

[0032] 21, first shaft rod; 22, transmission wheel; 23, transmission belt; 24, fan blade; 25, first driven gear;

[0033] 31, first plugging plate; 32, second plugging plate; 33, bidirectional lead screw; 34, first bevel gear; 35, second bevel gear; 36, transmission shaft; 37, bearing seat; 38, chute; 39, first transmission block; 310, second transmission block; 311, second driven gear.

[0034] 41, driving motor; 42, driving gear;

[0035] 51, swing frame; 52, first transmission gear; 53, second transmission gear; 54, electric telescopic cylinder;

[0036] 81, box cover; 82, through hole. Detailed implementation manners

[0037] The present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than limiting the utility model. Additionally, it should be noted that for the sake of description, only the parts related to the utility model are shown in the drawings.

[0038] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other. The following will detail the present utility model with reference to the accompanying drawings and in combination with the embodiments.

[0039] Please refer to Figures 1 to 4 , an embodiment of the present utility model provides a photovoltaic grid-connected box with a heat dissipation function, including:

[0040] A box body 1, with a closed spire 11 fixedly arranged at its top, an installation plate 12 for installing electrical components fixedly arranged inside it, air inlets 13 symmetrically opened on both sides near the top, and air outlets 14 symmetrically opened on both sides near the bottom;

[0041] A fan assembly 2, arranged at the top inside the box body 1;

[0042] A plugging assembly 3, symmetrically arranged on both sides inside the box body 1, for opening and plugging the air inlets 13 and air outlets 14;

[0043] A driving assembly 4, arranged inside the box body 1, for driving the fan assembly 2 to rotate through a transmission switching assembly 5, or driving the plugging assembly 3 to open or plug the air inlets 13 and air outlets 14 through the transmission switching assembly 5;

[0044] A transmission switching assembly 5, arranged inside the box body 1, for driving the transmission switching between the driving assembly 4 and the fan assembly 2 or the plugging assembly 3;

[0045] A temperature and humidity sensor 6, arranged on one side of the box body 1;

[0046] A controller 7, arranged inside the box body 1, electrically connected to the driving assembly 4, the transmission switching assembly 5, and the temperature and humidity sensor 6 respectively.

[0047] In this embodiment, when the photovoltaic grid-connected box operates, the fan assembly 2 is in transmission connection with the driving assembly 4 through the transmission switching assembly 5. At this time, the driving assembly 2 drives the fan assembly 2 to rotate, the hot air inside the box body 1 flows downward and is discharged through the air outlet 14, a negative pressure environment is formed at the top inside the box body 1, and the air outside the box body 1 enters the box through the air inlet 13, forming an air circulation inside and outside the box body 1, effectively reducing the temperature inside the box body 1 and having a good heat dissipation effect.

[0048] When it rains or the weather is humid, the temperature and humidity sensor detects that the humidity outside the box 1 is too high, and sends a signal to the controller 7. The controller 7 controls the transmission switching component 5 to operate, disconnects the transmission connection between the fan component 2 and the driving component 4, and connects the blocking component 3 to the driving component 4. At this time, the driving component 4 drives the blocking component 3 to block the air inlet 13 and the air outlet 14, preventing the humid air outside the box 1 from entering the box 1, ensuring the safety of the operation of the photovoltaic grid-connected box and improving the service life of the photovoltaic grid-connected box.

[0049] In a preferred embodiment, if Figure 1 As shown, a box door 15 is provided on the front of the box body 1 to facilitate the maintenance of the electrical components in the box body 1. One side of the box door 15 is hinged to the box body 1, and a box lock 16 is provided between the other side and the box body 1 to prevent unauthorized personnel from opening the box door 15 at will.

[0050] In a preferred embodiment, if Figure 1 As shown, an observation window 17 is provided on the box door 15 to facilitate viewing of the situation inside the box body 1.

[0051] In a preferred embodiment, if Figure 2 and Figure 4 As shown, the fan assembly 2 includes two first shafts 21 symmetrically arranged on both sides of the top of the box body 1, the top of the first shaft 21 is rotatably connected to the box body 1 through a bearing, a transmission wheel 22 is fixedly sleeved on the first shaft 21, and the transmission wheels 22 on the two first shafts 21 are connected through a transmission belt 23, a fan blade 24 is fixedly arranged on the bottom end of the first shaft 21, and a first driven gear 25 is fixedly sleeved on any first shaft 21.

[0052] In this embodiment, the driving component 4 drives a first shaft 21 to rotate through the first driven gear 25, and the first shaft 21 drives another first shaft 21 to rotate synchronously through the transmission wheel 22 and the transmission belt 23, thereby realizing the synchronous rotation of two groups of fan blades 24. The fan blades 24 blow the hot air in the box 1 downward and discharge it through the air outlet 14, thereby achieving good heat dissipation effect.

[0053] In a preferred embodiment, if Figure 2 and Figure 3As shown in the figure, the plugging assembly 3 includes a first plugging plate 31 and a second plugging plate 32. Vertical bidirectional lead screws 33 are symmetrically arranged on both sides inside the box body 1. The two ends of the bidirectional lead screw 33 are respectively rotatably connected to the box body 1 through bearings. A first bevel gear 34 is fixedly sleeved at the bottom end of the bidirectional lead screw 33. The first bevel gear 34 is meshed and connected with a second bevel gear 35. The two second bevel gears 35 are fixedly connected through a horizontally arranged transmission shaft 36. The transmission shaft 36 is rotatably connected to the box body 1 through a bearing seat 37. Sliding grooves 38 are symmetrically arranged on both sides of the inner side wall of the box body 1 at the two sides of the air inlet 13 and the air outlet 14. Below the air inlet 13, a first plugging plate 31 that is slidably connected to the sliding groove 38 is arranged. A first sliding sealing ring is fixedly arranged on the first plugging plate 31. Above the air outlet 14, a second plugging plate 32 that is slidably connected to the sliding groove 38 is arranged. A second sliding sealing ring is fixedly arranged on the second plugging plate 32. A first driving block 39 and a second driving block 310 are symmetrically threadedly connected to the bidirectional lead screw 33. The first driving block 39 is fixedly connected to the first plugging plate 31. The second driving block 310 is fixedly connected to the second plugging plate 32. A second driven gear 311 is fixedly sleeved at the top end of the bidirectional lead screw 33 on the same side as the first driven gear 25.

[0054] In this embodiment, the driving assembly 4 drives one bidirectional lead screw 33 to rotate through the second driven gear 311. The bidirectional lead screw 33 drives the other bidirectional lead screw 33 to rotate synchronously through the first bevel gear 34, the second bevel gear 35 and the transmission shaft 36. The rotating bidirectional lead screw 33 drives the first plugging plate 31 to move up and down through the first driving block 39, and drives the second plugging plate 32 to move up and down through the second driving block 310, realizing the synchronous reverse movement of the first plugging plate 31 and the second plugging plate 32, thereby synchronously opening or plugging the air inlet 13 and the air outlet 14, and improving the safety of the operation of the photovoltaic grid-connected box.

[0055] In a preferred embodiment, as Figure 2 and Figure 3 shown, guard nets 18 covering the plugging assembly 3 are respectively fixedly arranged on both sides inside the box body 1, playing a protective role; avoidance openings are formed in the guard nets 18 corresponding to the transmission switching assembly 5 to avoid affecting the transmission connection between the driving assembly 4 and the plugging assembly 3; a support plate 19 is fixedly arranged at the bottom inside the box body 1 above the transmission shaft 36, which can be used for the support and installation of electrical components and can also block the transmission shaft 36 at the lower part to improve safety.

[0056] In a preferred embodiment, as Figure 2 and Figure 4 shown, the driving assembly 4 includes a driving motor 41 and a driving gear 42. The driving gear 42 is arranged inside the box body 1 between the first driven gear 25 and the second driven gear 311. The driving motor 41 is fixedly arranged in the spire 11 and is in transmission connection with the driving gear 42.

[0057] In this embodiment, the spire 11 can not only prevent water from accumulating on the top of the box body 1, but also be used to accommodate the drive motor 41. The drive motor 41 drives the fan assembly 2 or the plugging assembly 3 through the driving gear 42, and the driving effect is good. Moreover, the gear ratio of the driving gear 42 to the first driven gear 25 or the second driven gear 311 can be designed according to requirements to achieve the corresponding driving speed.

[0058] In a preferred embodiment, as Figure 4 shown, the transmission switching assembly 5 includes a swing frame 51. The swing frame 51 is arranged on the top inside the box body 1 on one side of the driving gear 42, the first driven gear 25 and the second driven gear 311. The middle of the swing frame 51 is rotatably connected to the top inside the box body 1 through a second shaft rod. A first transmission gear 52 is rotatably arranged at one end of the swing frame 51, and a second transmission gear 53 is rotatably arranged at the other end. An electric telescopic cylinder 54 is arranged between the swing frame 51 and the box body 1, which is used to drive the swing frame 51 to rotate so that the first driven gear 52 meshes with the driving gear 42 and the first driven gear 25 at the same time or the second transmission gear 53 meshes with the driving gear 42 and the second driven gear 311 at the same time.

[0059] In this embodiment, one end of the electric telescopic cylinder 54 is rotatably connected to the box body 1, and the other end is rotatably connected to the swing frame 51. When the drive assembly 4 drives the fan assembly 2 to rotate, the electric telescopic cylinder 54 drives the swing frame 51 to rotate, so that the first driven gear 52 meshes with the driving gear 42 and the first driven gear 25 at the same time, realizing the transmission connection between the drive assembly 4 and the fan assembly 2;

[0060] When the drive assembly 4 drives the plugging assembly 3 to move, the electric telescopic cylinder 54 drives the swing frame 51 to rotate, so that the first driven gear 52 meshes with the driving gear 42 and the second driven gear 311 at the same time, realizing the transmission connection between the drive assembly 4 and the plugging assembly 3; The transmission switching is realized, and the transmission effect is good.

[0061] In a preferred embodiment, as Figure 2 and Figure 3 shown, the air inlet 13 and the air outlet 14 are respectively composed of a plurality of parallel long holes, and the ventilation effect is good; both the air inlet 13 and the air outlet 14 are inclined downward from the inside to the outside of the box body 1 to prevent water from accumulating in the air inlet 13 and the air outlet 14 when it rains.

[0062] In a preferred embodiment, as Figure 2 shown, a storage box 8 is fixedly arranged at the bottom inside the box body 1. A box cover 81 is detachably arranged on the top of the storage box 8. Through holes 82 are evenly distributed on the outer wall of the storage box 8. Activated carbon is arranged inside the storage box 8, which is used to adsorb dust and water vapor inside the box body 1 and improve the safety of the photovoltaic grid-connected box.

[0063] In the description of this specification, terms such as "connection", "installation", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0064] In the description of this specification, the description of terms such as "one embodiment", "some embodiments", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0065] The above are only the preferred embodiments of this application and are not used to limit this application. For those skilled in the art, this application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims

1. A photovoltaic grid-connected box with heat dissipation function, characterized in that: include: The box body (1) has a closed pointed top (11) fixedly arranged on the top, a mounting plate (12) for mounting electrical components fixedly arranged inside, air inlets (13) symmetrically arranged on both sides near the top, and air outlets (14) symmetrically arranged on both sides near the bottom; A fan assembly (2) is arranged at the top of the box (1); A blocking assembly (3) is symmetrically arranged on both sides of the box body (1) and is used to open and block the air inlet (13) and the air outlet (14); A driving assembly (4) is arranged in the housing (1) and is used to drive the fan assembly (2) to rotate through the transmission switching assembly (5), or to drive the blocking assembly (3) to open or block the air inlet (13) and the air outlet (14) through the transmission switching assembly (5); A transmission switching component (5) is arranged in the housing (1) and is used for transmission switching between the driving component (4) and the fan component (2) or the blocking component (3); A temperature and humidity sensor (6) is arranged on one side of the box (1); The controller (7) is arranged in the housing (1) and is electrically connected to the driving component (4), the transmission switching component (5) and the temperature and humidity sensor (6) respectively.

2. The photovoltaic grid-connected box with heat dissipation function according to claim 1, characterized in that: A box door (15) is arranged on the front of the box body (1), one side of the box door (15) is hinged to the box body (1), and a box lock (16) is arranged between the other side and the box body (1).

3. The photovoltaic grid-connected box with heat dissipation function according to claim 2, characterized in that: The box door (15) is provided with an observation window (17).

4. The photovoltaic grid-connected box with heat dissipation function according to claim 1, characterized in that: The fan assembly (2) comprises two first shafts (21) symmetrically arranged on both sides of the top of the housing (1); the top end of the first shaft (21) is rotatably connected to the housing (1) via a bearing; a transmission wheel (22) is fixedly sleeved on the first shaft (21); the transmission wheels (22) on the two first shafts (21) are connected in transmission via a transmission belt (23); a fan blade (24) is fixedly arranged on the bottom end of the first shaft (21); and a first driven gear (25) is fixedly sleeved on any of the first shafts (21).

5. The photovoltaic grid-connected box with heat dissipation function according to claim 4, characterized in that: The blocking assembly (3) comprises a first blocking plate (31) and a second blocking plate (32); vertical bidirectional screws (33) are symmetrically arranged on both sides of the housing (1); both ends of the bidirectional screws (33) are rotatably connected to the housing (1) via bearings; a first bevel gear (34) is fixedly sleeved at the bottom end of the bidirectional screw (33); the first bevel gear (34) is meshingly connected to a second bevel gear (35); the two second bevel gears (35) are fixedly connected via a horizontally arranged transmission shaft (36); the transmission shaft (36) is rotatably connected to the housing (1) via a bearing seat (37); sliding grooves (38) are symmetrically arranged on the inner side wall of the housing (1) on both sides of the air inlet (13) and the air outlet (14); the air inlet (1 3), the first blocking plate (31) slidably connected to the slide groove (38) is arranged below, the first blocking plate (31) is fixedly provided with a first sliding sealing ring, the second blocking plate (32) slidably connected to the slide groove (38) is arranged above the air outlet (14), the second blocking plate (32) is fixedly provided with a second sliding sealing ring, the first transmission block (39) and the second transmission block (310) are symmetrically threadedly connected on the bidirectional lead screw (33), the first transmission block (39) is fixedly connected to the first blocking plate (31), the second transmission block (310) is fixedly connected to the second blocking plate (32), and the top end of the bidirectional lead screw (33) on the same side as the first driven gear (25) is fixedly sleeved with a second driven gear (311).

6. The photovoltaic grid-connected box with heat dissipation function according to claim 5, characterized in that: Protective nets (18) for covering the blocking component (3) are fixedly arranged on both sides of the box body (1), and an escape opening is provided on the protective net (18) corresponding to the transmission switching component (5). A support plate (19) is fixedly arranged at the bottom of the box body (1) above the transmission shaft (36).

7. The photovoltaic grid-connected box with heat dissipation function according to claim 5, characterized in that: The driving assembly (4) comprises a driving motor (41) and a driving gear (42); the driving gear (42) is arranged in the housing (1) between the first driven gear (25) and the second driven gear (311); the driving motor (41) is fixedly arranged in the pointed top (11) and is drivingly connected to the driving gear (42).

8. The photovoltaic grid-connected box with heat dissipation function according to claim 7, characterized in that: The transmission switching assembly (5) comprises a swing frame (51), the swing frame (51) being arranged at the top of the housing (1) and being located on one side of the driving gear (42), the first driven gear (25) and the second driven gear (311), the middle part of the swing frame (51) being rotatably connected to the top of the housing (1) via a second shaft rod, one end of the swing frame (51) being rotatably provided with a first transmission gear (52), and the other end being rotatably provided with a second transmission gear (53), an electric telescopic cylinder (54) being arranged between the swing frame (51) and the housing (1), for driving the swing frame (51) to rotate so that the first driven gear (52) is meshed with the driving gear (42) and the first driven gear (25) at the same time, or the second transmission gear (53) is meshed with the driving gear (42) and the second driven gear (311) at the same time.

9. The photovoltaic grid-connected box with heat dissipation function according to claim 1, characterized in that: The air inlet (13) and the air outlet (14) are respectively composed of a plurality of parallel long holes, and the air inlet (13) and the air outlet (14) are both inclined downward from the inside to the outside of the box body (1).

10. The photovoltaic grid-connected box with heat dissipation function according to claim 1, characterized in that: A container box (8) is fixedly arranged at the bottom of the box body (1), a box cover (81) is detachably arranged at the top of the container box (8), through holes (82) are evenly distributed on the outer wall of the container box (8), and activated carbon is arranged in the container box (8).

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