Multi-protection intelligent photovoltaic grid-connected cabinet

Abstract

This invention provides a multi-protection intelligent photovoltaic grid-connected cabinet, whose fire extinguishing mechanism is located at the top of the cabinet or the bottom of the support plate, covering the electronic components. The mechanism employs a double-layer seal consisting of a main housing, a cover plate, and an outer housing, with the main housing filled with a fire extinguishing agent. In the event of a fire, the flame heats the main housing, causing the fire extinguishing agent to decompose rapidly, generating high-pressure carbon dioxide that is sprayed at high speed towards the fire source. A guide vane causes the gas to rotate and diffuse, forming a fan-shaped area to expand the fire extinguishing zone. It also includes an expansion sleeve and spring structure, which store energy and accelerate gas release when the gas pressure increases, enhancing the fire extinguishing effect. A grid-like distribution of spacers and grooves increases the heat-receiving area, accelerating the decomposition of the fire extinguishing agent. The thermally conductive materials of the main housing and spacers form a heat dissipation fin effect, improving thermal response efficiency. At room temperature, a blocking sphere and a retaining ring seal the gas; in case of overheating, the silicone retaining ring melts, diverting the gas to the heat-insulated space of the outer housing, avoiding the risk of explosion. This invention achieves rapid response, efficient fire extinguishing, and safety protection.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic grid-connected cabinet technology, and in particular to a multi-protection intelligent photovoltaic grid-connected cabinet. Background Technology

[0002] Photovoltaic grid-connected cabinets (also known as photovoltaic grid-connected distribution cabinets or photovoltaic grid-connected control cabinets) are key electrical equipment in photovoltaic power generation systems. They are mainly used to connect photovoltaic arrays to the public power grid, ensuring the safe and stable connection of electrical energy to the grid. In application publication number CN113629512A, a scheme for intelligent fire extinguishing using a thermal expansion extinguishing medium was proposed: when the temperature inside the cabinet rises abnormally, the thermal expansion extinguishing medium decomposes to produce carbon dioxide, increasing the pressure in the upper chamber and overcoming the spring force, driving the partition to separate downwards, thereby releasing carbon dioxide gas and sodium bicarbonate particles into the cabinet, achieving flame retardancy by covering the surface of the burning material.

[0003] However, this solution has the following limitations: First, photovoltaic grid-connected cabinets typically have heat dissipation and ventilation channels to allow air circulation, which affects fire extinguishing efficiency. Second, although the fire extinguishing box is made of a heat-absorbing metal, the insulation layer formed by the partition separating the upper and lower chambers slows down heat conduction. Furthermore, the fire extinguishing process involves multiple steps, including the medium (sodium bicarbonate) pressing against the partition, falling into the lower chamber fire extinguishing box, and then entering the cabinet through the rod channel, leading to a prolonged response time. Simultaneously, the uncertainty of the medium's falling proportion and the cabinet's air circulation design further weaken the fire extinguishing effect, resulting in a slow fire response and poor actual fire extinguishing efficiency. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] To address the aforementioned problems, the present invention provides the following technical solution: A multi-protection intelligent photovoltaic grid-connected cabinet includes a fire extinguishing mechanism installed on the bottom surface of the cabinet's inner upper skin and / or the cabinet's inner support plate, forming a vertical positional relationship with the various electronic components inside the cabinet. The fire extinguishing mechanism includes a main box, a cover plate, and an outer box. The main box and the cover plate are sealed together, and the outer box is sealed together with the cover plate, thereby forming two independent sealed spaces. The outer box is connected to the bottom surface of the cabinet's inner upper skin and / or the cabinet's inner support plate, so that the main box is located on top of each electronic component. The main box and the cover plate have independent sealed spaces with conduits inserted to connect them to the inside of the cabinet. The cover plate is sealed with an expansion sleeve that protrudes from the top of the conduit. The top of the expansion sleeve is provided with an extension plate, and a spring is provided between the extension plate and the cover plate. The expansion sleeve has an opening at the top that is sealed to the outer surface of the adapter, and the limiting end of the adapter is sleeved on the inner wall of the conduit. The outer surface of the conduit near the top has a waist hole that connects to the independent sealed space of the main box and the cover plate. The inside of the conduit near the bottom has a retaining ring that is in sealed contact with the blocking ball at the bottom of the adapter. The inner wall between the bottom of the conduit and the retaining ring has a guide plate. The box spacing between the cover plate and the main box body, as well as the expansion cavity of the expansion sleeve, are connected to form an independent sealed space between the main box body and the cover plate. The heat insulation space of the outer box body is an independent sealed space between the outer box body and the cover plate.

[0006] As a preferred embodiment of the multi-protection intelligent photovoltaic grid-connected cabinet of the present invention, the cavity of the main box is divided into several sub-cavities by multiple partitions provided in the main box, and both the main box and the partitions are made of thermally conductive materials.

[0007] As a preferred embodiment of the multi-protection intelligent photovoltaic grid-connected cabinet of the present invention, the back of the main box is provided with a groove, and the groove is embedded between the partition strips, so that the back of the main box forms an outer surface composed of multiple side walls and bottom walls, thereby increasing the heat-receiving surface area.

[0008] As a preferred embodiment of the multi-protection intelligent photovoltaic grid-connected cabinet of the present invention, the partition bars are distributed in a multi-directional staggered manner in the main box to form a grid structure, wherein the grid structure includes a crisscross arrangement, a triangular arrangement, or a honeycomb arrangement.

[0009] As a preferred embodiment of the multi-protection intelligent photovoltaic grid-connected cabinet of the present invention, the retaining ring is made of silicone, the surface of the blocking ball is smooth, and the expansion sleeve is made of corrugated silicone.

[0010] The beneficial effects of this invention are: when the flame directly heats the main box, sodium bicarbonate decomposes rapidly to produce high-pressure carbon dioxide, which is sprayed out at high speed through the conduit to cover the fire source; at the same time, the expansion sleeve and spring store energy and accelerate gas release when the gas pressure increases, generating a more powerful carbon dioxide gas flow, and the extinguishing agent covers the electronic components from top to bottom, which, combined with the relatively small diameter of the conduit, forms a high-speed air flow, effectively isolating oxygen and significantly improving the fire extinguishing response speed and coverage effect.

[0011] Uniform heating and efficient heat transfer are achieved through a three-dimensional heat conduction network and distributed medium storage. The grid-like distribution of the spacers prevents the accumulation of extinguishing agent, ensures maximum heating area, and accelerates the thermal decomposition of media such as sodium bicarbonate. At the same time, the embedded design of the grooves and spacers reduces the thickness of the spacers and increases the heat dissipation surface area. Combined with the thermally conductive main body and spacers, a heat dissipation fin effect is formed, which significantly shortens the extinguishing agent triggering time and improves thermal response efficiency. Through a dual sealing and fail-safe mechanism, safe pressurization and directional fire suppression are achieved. The plugging sphere and baffle ring of the adapter seal and lock in carbon dioxide gas generated when the temperature is too high at room temperature, preventing the extinguishing agent from failing. In case of fire, the high-pressure gas pushes open the plug for rapid release. If the temperature exceeds the limit, the silicone baffle ring and expansion sleeve melt, and the gas is diverted to the heat-insulated space of the outer casing to avoid the risk of explosion. At the same time, the guide plate causes the sprayed gas to rotate and diffuse, forming a fan-shaped coverage area, which quickly isolates oxygen and prevents outside air from entering, balancing fire suppression speed and safety. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a perspective view of the entire embodiment.

[0013] Figure 2 This is an example. Figure 1 The front view.

[0014] Figure 3 This is an example. Figure 2 A three-dimensional diagram of the fire extinguishing system.

[0015] Figure 4 This is an example. Figure 3 Partial 3D view.

[0016] Figure 5 This is a perspective view of the main housing in the fire extinguishing mechanism of this embodiment.

[0017] Figure 6 This is an example. Figure 5 A bottom view of the main box.

[0018] Figure 7 This is an example. Figure 5 A partial sectional view of the main box.

[0019] Figure 8 This is a perspective sectional view of the fire extinguishing mechanism in this embodiment.

[0020] Figure 9 This is the embodiment. Figure 8 Plan view of the fire extinguishing mechanism.

[0021] In the diagram: cabinet 100, housing cavity 100a, ventilation grille 100b, upper inner skin of the cabinet 100c, support plate 101, support frame 102, various electronic components 103, cabinet door 104; Fire extinguishing mechanism 200, main box 201, cavity 201a, box spacing 201-1, partition 202, sub-cavity 202a, side wall 202a-1, bottom wall 202a-2, groove 202b, conduit 203, waist hole 203a, retaining ring 203b, guide plate 203c; Cover plate 204, expansion sleeve 205, opening 205a, expansion cavity 205b, adapter 206, limiting end 206a, blocking ball 206b, extension plate 207, spring 208, outer box 209, connecting piece 209a, heat insulation space 209b. Detailed Implementation

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0023] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0024] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0025] Example 1

[0026] Reference Figures 1 to 3This is the first embodiment of the present invention. This embodiment provides a multi-protection intelligent photovoltaic grid-connected cabinet, including a fire extinguishing mechanism 200 disposed on the upper inner skin 100c of the cabinet body 100 and / or on the bottom surface of the support plate 101, so as to form a vertical position relationship with each electronic component 103 inside the cabinet body 100. The fire extinguishing mechanism 200 includes a main box 201, a cover plate 204 and an outer box 209. The main box 201 and the cover plate 204 are sealed together, and the outer box 209 is sealed together with the cover plate 204, thereby forming two independent sealed spaces. The cover plate 204 is connected to the upper inner skin 100c of the cabinet and / or on the bottom surface of the support plate 101, so that the main box 201 is located on top of each electronic component 103. The main box 201 and the cover plate 204 have independent sealed spaces with conduits 203 inserted to connect them to the interior of the cabinet 100.

[0027] Specifically, this embodiment provides a multi-protection intelligent photovoltaic grid-connected cabinet, aiming to solve the problems of slow fire extinguishing response and low fire extinguishing efficiency in the prior art. At least one support plate 101 and a support frame 102 are installed in the receiving cavity 100a of the cabinet 100, both used to fix various electronic components 103. In addition, multiple ventilation grilles 100b are provided on the side of the cabinet 100 to allow air convection and achieve heat dissipation. The cabinet 100 also has a cabinet door 104. This photovoltaic grid-connected cabinet includes the cabinet 100 and a fire extinguishing mechanism 200 disposed inside the cabinet 100. The fire extinguishing mechanism 200 is arranged on the upper skin 100c and / or the bottom surface of the support plate 101 inside the cabinet, and forms a vertical positional relationship with the various electronic components 103 inside the cabinet 100 to ensure that the fire extinguishing agent can quickly cover the fire source. The fire extinguishing mechanism 200 includes a main housing 201, a cover plate 204, and an outer housing 209. The main housing 201 and the cover plate 204 are sealed together to form a first independent sealed space, while the outer housing 209 and the cover plate 204 are sealed together to form a second independent sealed space. Under normal conditions, the outer housing 209 serves to insulate the medium (sodium bicarbonate) in the first independent sealed space, especially since the upper inner skin 100c is easily exposed to sunlight and has a high temperature; without insulation, the medium (sodium bicarbonate) can easily evaporate. The cover plate 204 is fixedly connected to the bottom surface of the upper inner skin 100c and / or the support plate 101, so that the main housing 201 is located on top of the electronic components 103, facilitating the release of the extinguishing agent from top to bottom. Extinguishing agent release mechanism A conduit 203 is inserted into the sealed space formed by the main housing 201 and the cover plate 204, connecting it to the interior of the cabinet 100. When the temperature inside the cabinet rises abnormally, the fire extinguishing mechanism 200 can respond quickly. Heat-induced triggering: If a fire breaks out inside the cabinet, the flames and heat waves will directly exchange heat with the bottom of the main box 201, and the fire extinguishing agent (sodium bicarbonate) inside the main box 201 will rapidly expand due to heat, triggering the release mechanism.

[0028] Rapid release: The extinguishing agent enters the cabinet 100 directly through the conduit 203, avoiding the delayed steps such as partition separation and medium drop in the existing technology, and improving the fire extinguishing response speed.

[0029] Coverage fire suppression: Since the fire extinguishing mechanism 200 is located above the electronic component 103 and through the small outlet of the conduit 203, the flow rate of carbon dioxide gas is increased, and the fire extinguishing agent can be sprayed out at high speed to cover the burning area, effectively blocking oxygen and inhibiting the spread of fire. For example, an expansion sleeve 205 is sealed on the cover plate 204 and protrudes from the top of the conduit 203. An extension plate 207 is provided on the top of the expansion sleeve 205. A spring 208 is provided between the extension plate 207 and the cover plate 204. When the medium (sodium bicarbonate) is rapidly decomposed into carbon dioxide at high temperature, the gas in the conduit 203 cannot be ejected quickly, causing the expansion sleeve 205 to expand and the spring 208 to stretch to form elastic potential energy. This process can prevent the risk of explosion caused by excessive gas pressure in the first independent sealed space formed by the sealing connection between the main box 201 and the cover plate 204. At the same time, the expansion of the expansion sleeve 205 and the stretching of the spring 208 to form elastic potential energy can further promote the gas ejection from the conduit 203, increase the gas ejection rate, enhance the fire extinguishing efficiency, and thus reduce losses.

[0030] Example 2

[0031] Reference Figures 3 to 7 In the second embodiment of the present invention, the cavity 201a of the main box 201 is divided into several sub-cavities 202a by multiple partitions 202. Both the main box 201 and the partitions 202 are made of thermally conductive materials. The partitions 202 separate the cavity 201a containing the medium (sodium bicarbonate), which is conducive to the uniform spreading of the medium and prevents it from accumulating during transportation and installation, thus affecting the heating of the medium and generating carbon dioxide gas. At the same time, both the main box 201 and the partitions 202 are made of thermally conductive materials. The partitions 202 are like heat dissipation fins on the surface of a heat sink, which improves the heating efficiency of the medium.

[0032] The back of the main box 201 is provided with a groove 202b, and the groove 202b is embedded between the partition strips 202, so that the back of the main box 201 forms an outer surface composed of multiple side wall surfaces 202a-1 and bottom wall surfaces 202a-2, thereby increasing the heat dissipation surface area. This reduces the thickness of the partition strips 202 and also increases the heat dissipation surface area.

[0033] The spacers 202 are distributed in a multi-directional, interlaced manner within the main housing 201, forming a grid-like structure. The grid-like structure includes, but is not limited to, crisscrossing, triangular, or honeycomb arrangements. The grid-like distribution of the spacers 202 further increases the heat dissipation surface area.

[0034] It is worth mentioning that by constructing a three-dimensional heat conduction network through spacers 202 and embedding grooves 202b between spacers 202, the problems of heat conduction delay and uneven medium distribution are solved at the same time. The rest is the same as in Example 1.

[0035] Example 3

[0036] Reference Figure 3 , Figure 8 , Figure 9 This is the third embodiment of the present invention. The difference between this embodiment and embodiment 1 is that the top of the expansion sleeve 205 has an opening 205a that is sealed and connected to the outer surface of the adapter 206. The limiting end 206a of the adapter 206 is fitted onto the inner wall of the conduit 203. The outer surface of the conduit 203 near the top has a waist hole 203a. The conduit 203 communicates with the inside of the cabinet through the waist hole 203a. The independent sealing spaces of the main box 201 and the cover plate 204 are connected. The inside of the conduit 203 near the bottom has a retaining ring 203b, which is sealed and contacted with the blocking ball 206b at the bottom of the adapter 206.

[0037] Specifically, an adapter 206, shaped like a rod, is fitted inside the conduit 203. Its upper limiting end 206a fits against the inner wall of the conduit 203, creating a limiting effect so that the expansion sleeve 205 moves vertically upwards after expansion. Near the bottom of the conduit 203, a retaining ring 203b made of silicone is also provided. The bottom of the adapter 206 has a smooth-surfaced blocking ball 206b, which, when in contact with the retaining ring 203b, prevents gas from being ejected from the conduit 203. Although a small amount of carbon dioxide gas may be generated from the medium when the cabinet is exposed to sunlight, the expansion of the expansion sleeve 205, the elastic potential energy of the spring 208, and the temperature are insufficient to generate a large amount of gas, thus sealing off the carbon dioxide gas and preventing the medium from failing in the event of a fire. In the event of a fire, the gap 201-1 between the cover plate 204 and the main box 201, as well as the expansion cavity 205b of the expansion sleeve 205, connect to form an independent sealed space between the main box 201 and the cover plate 204. This provides sufficient air pressure for a rapid response. Simultaneously, if the opening and closing action of the retaining ring 203b and the blocking ball 206b fails, the silicone retaining ring 203b can melt at high temperatures, allowing gas to escape, unaffected by structural failure. If the temperature is too high, the expansion sleeve 205, also made of silicone, can melt, allowing gas to flow into the heat insulation space 209b of the outer box 209. This provides an independent sealed space between the outer box 209 and the cover plate 204, preventing an explosion in the sealed space between the cover plate 204 and the main box 201.

[0038] A rod-shaped adapter 206 is fitted inside the conduit 203. The upper limiting end 206a of the adapter 206 engages with the inner wall of the conduit 203 to form a limiting structure, ensuring that the adapter 206 can also move vertically upwards after the expansion sleeve 205 expands. A silicone retaining ring 203b is located near the bottom of the conduit 203, and a smooth-surfaced blocking ball 206b is located at the bottom of the adapter 206. When the blocking ball 206b contacts the retaining ring 203b, it can prevent gas from being ejected from the conduit 203, thus maintaining a seal when the cabinet is exposed to sunlight and generates a small amount of carbon dioxide gas.

[0039] When no fire occurs, the expansion force of the expansion sleeve 205, the elastic potential energy of the spring 208, and the ambient temperature work together to ensure that the structure can effectively seal the gas and maintain pressure, preventing the medium from failing due to high temperature and storing carbon dioxide gas.

[0040] When a fire occurs, the box gap 201-1 between the cover plate 204 and the main box 201, and the independent sealed space connected to the expansion cavity 205b of the expansion sleeve 205, have a large pressure. The separation time between the blocking ball 206b and the retaining ring 203b is relatively fast and the air pressure is sufficient. The stored carbon dioxide gas is quickly ejected from the duct 203, realizing a rapid fire extinguishing response.

[0041] If the seal between the retaining ring 203b and the plugging ball 206b fails due to aging, the high temperature will melt the silicone retaining ring 203b, releasing gas and preventing the structure from jamming. If the temperature continues to rise, the silicone expansion sleeve 205 will also melt, allowing gas to flow into the heat insulation space 209b of the outer casing 209, forming a second sealing barrier to prevent the main sealing space from exploding due to excessive pressure, ensuring safety and reliability while extinguishing the fire.

[0042] The inner wall between the bottom of the duct 203 and the baffle ring 203b is provided with a guide plate 203c. The guide plate 203c can rotate the ejected airflow and form a fan in the area covered by the airflow. The high-speed gas quickly reaches outside the fire area and quickly fills the fire area with oxygen, preventing outside air from entering. This structure, in which the inner wall between the bottom of the duct 203 and the baffle ring 203b is provided with a guide plate 203c, satisfies both Embodiment 1 and this embodiment.

[0043] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0044] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the invention as currently considered, or those features that are not relevant to implementing the invention) may be omitted.

[0045] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A multi-protection intelligent photovoltaic grid-connected cabinet, characterized in that: The fire extinguishing mechanism (200) is located on the bottom surface of the cabinet upper skin (100c) and / or the cabinet support plate (101) of the cabinet (100), forming a vertical position relationship with each electronic component (103) inside the cabinet (100). The fire extinguishing mechanism (200) includes a main box (201), a cover plate (204) and an outer box (209). The main box (201) and the cover plate (204) are sealed together, and the outer box (209) is sealed together with the cover plate (204), thereby forming two independent sealed spaces. The outer box (209) is connected to the bottom surface of the cabinet upper skin (100c) and / or the cabinet support plate (101) so that the main box (201) is located on top of each electronic component (103). The main box (201) and the cover plate (204) have independent sealed spaces with conduits (203) inserted to connect them to the interior of the cabinet (100). The cover plate (204) is sealed with an expansion sleeve (205) that protrudes from the top of the conduit (203). The top of the expansion sleeve (205) is provided with an extension plate (207). A spring (208) is provided between the extension plate (207) and the cover plate (204). The expansion sleeve (205) has an opening (205a) at the top, which is sealed to the outer surface of the adapter (206). The limiting end (206a) of the adapter (206) is sleeved on the inner wall of the conduit (203). The outer surface of the conduit (203) near the top has a waist hole (203a) that connects to the independent sealed space of the main box (201) and the cover plate (204). The conduit (203) has a retaining ring (203b) near the bottom. The retaining ring (203b) is in sealed contact with the blocking ball (206b) at the bottom of the adapter (206). The inner wall between the bottom of the conduit (203) and the retaining ring (203b) is provided with a guide plate (203c). The box spacing (201-1) between the cover plate (204) and the main box body (201) and the expansion cavity (205b) of the expansion sleeve (205) are connected to form an independent sealed space between the main box body (201) and the cover plate (204). The heat insulation space (209b) of the outer box body (209) is an independent sealed space between the outer box body (209) and the cover plate (204).

2. The multiple protection intelligent photovoltaic grid-connected cabinet according to claim 1, characterized in that: The cavity (201a) of the main box (201) is divided into several sub-cavities (202a) by multiple partitions (202) provided on the main box (201). Both the main box (201) and the partitions (202) are made of thermally conductive material.

3. The multiple protection intelligent photovoltaic grid-connected cabinet according to claim 2, characterized in that: The back of the main box (201) is provided with a groove (202b), and the groove (202b) is embedded between the partition strips (202), so that the back of the main box (201) forms an outer surface composed of multiple side wall surfaces (202a-1) and bottom wall surfaces (202a-2), thereby increasing the heated surface area.

4. The multiple protection intelligent PV grid cabinet of claim 3, wherein: The partition strips (202) are distributed in a multi-directional staggered manner within the main box (201) to form a grid structure, which includes a crisscross arrangement, a triangular arrangement, or a honeycomb arrangement.

5. The multiple protection intelligent photovoltaic grid connected cabinet of claim 1, wherein: The blocking ring (203b) is made of silica gel, the surface of the blocking ball (206b) is smooth, and the expansion sleeve (205) is made of corrugated silica gel.

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