Multi-protection intelligent photovoltaic grid-connected cabinet

Abstract

The invention provides a multi-protection intelligent photovoltaic grid-connected cabinet which is characterized in that a fire extinguishing mechanism is arranged at the top of a cabinet body or the bottom of a supporting plate and covers electronic components. The mechanism adopts double-layer sealing of a main box body, a cover plate and an outer box body, and the main box body is filled with a fire extinguishing agent. In fire, flames heat the main box body to promote the fire extinguishing agent to be quickly decomposed to generate high-pressure carbon dioxide which is sprayed to a fire source at high speed. The flow deflectors enable gas to rotate and diffuse to form a fan-shaped expanded fire extinguishing area. An expansion sleeve and a spring structure are further included, when air pressure rises, energy is stored, gas release is accelerated, and the fire extinguishing effect is enhanced. The partition strips are distributed in a gridding mode, the heating area is increased through the grooves, decomposition of the fire extinguishing agent is accelerated, the heat conduction materials of the main box body and the partition strips form the heat dissipation fin effect, and the thermal response efficiency is improved. The blocking ball body and the check ring seal gas at normal temperature; and the silica gel check ring is melted during overtemperature, and gas is shunted to the heat insulation space of the outer box body to avoid the explosion risk. Rapid response, efficient fire extinguishing and safety protection are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic grid-connected cabinets, and in particular to a multi-protection intelligent photovoltaic grid-connected cabinet. Background Art

[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, primarily used to connect photovoltaic arrays to the public grid, ensuring the safe and stable integration of electricity into the grid. Application publication number CN113629512A proposes a solution for intelligent fire extinguishing using a thermal expansion fire extinguishing medium. When the temperature inside the cabinet rises abnormally, the thermal expansion fire extinguishing medium decomposes to produce carbon dioxide, increasing the pressure in the upper chamber and overcoming the spring force, driving the partition downward. This releases carbon dioxide gas and sodium bicarbonate particles into the cabinet, which cover the surface of the burning object and provide flame retardancy.

[0003] However, this solution has the following limitations: First, photovoltaic grid-connected cabinets typically have heat dissipation ventilation channels to achieve air circulation, which affects fire extinguishing efficiency. Second, although the fire extinguishing box body is made of heat-absorbing metal, the insulation layer formed by the partition separating the upper storage chamber from the lower chamber slows heat conduction. Furthermore, the fire extinguishing process requires the medium (sodium bicarbonate) to squeeze the partition, fall into the lower chamber of the fire extinguishing box body, and then enter the cabinet through the rod channel, resulting in a prolonged response time. At the same time, the uncertainty of the medium drop rate and the cabinet's air circulation design further weakened 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 summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of this application to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions should not be used to limit the scope of the present invention.

[0005] In order to solve the above-mentioned problems, the present invention provides the following technical solutions:

[0006] A multi-protection intelligent photovoltaic grid-connected cabinet includes a fire extinguishing mechanism disposed on the upper inner skin of the cabinet and / or on the bottom surface of the support plate, forming a vertical positional relationship with various electronic components in the cabinet. The fire extinguishing mechanism includes a main box body, a cover plate, and an outer box body. The main box body and the cover plate are sealed together, and the outer box body and the cover plate are sealed together, thereby forming two independent sealed spaces. The cover plate is connected to the upper inner skin of the cabinet and / or the bottom surface of the support plate, so that the main box body is located on top of the various electronic components.

[0007] A conduit is inserted into the independent sealed spaces of the main box body and the cover plate to communicate with the interior of the cabinet.

[0008] As a preferred solution of the multi-protection intelligent photovoltaic grid-connected cabinet described in the present invention, an expansion sleeve is sealed on the cover plate and protrudes from the top of the conduit, an extension plate is provided on the top of the expansion sleeve, and a spring is provided between the extension plate and the cover plate.

[0009] As a preferred solution of the multi-protection intelligent photovoltaic grid-connected cabinet described in the present invention, the top of the expansion sleeve is provided with an opening sealedly connected to the outer surface of the adapter, and the limiting end of the adapter contacts the inner wall of the conduit.

[0010] As a preferred solution of the multi-protection intelligent photovoltaic grid-connected cabinet described in the present invention, the outer surface of the conduit near the top is provided with a waist hole connected to the independent sealed space of the main box body and the cover plate, and the inner part of the conduit near the bottom is provided with a retaining ring, which is in sealing contact with the blocking sphere at the bottom of the adapter.

[0011] As a preferred solution of the multi-protection intelligent photovoltaic grid-connected cabinet described in the present invention, a guide plate is provided on the inner wall between the bottom of the conduit and the retaining ring.

[0012] As a preferred solution of the multi-protection intelligent photovoltaic grid-connected cabinet described in the present invention, the box spacing between the cover plate and the main box body and the expansion cavity of the expansion sleeve are connected to form an independent sealed space for the main box body and the cover plate, and the insulation space of the outer box body is an independent sealed space for the outer box body and the cover plate.

[0013] As a preferred solution of the multi-protection intelligent photovoltaic grid-connected cabinet described in the present invention, the cavity of the main box body is divided into several sub-cavities by multiple partitions provided on the main box body, and the main box body and the partitions are made of heat-conducting materials.

[0014] As a preferred solution of the multi-protection intelligent photovoltaic grid-connected cabinet described in the present invention, a groove is provided on the back of the main box body, and the groove is embedded between the partition bars, so that the back of the main box body forms an outer surface composed of multiple side walls and a bottom wall, thereby increasing the heat dissipation surface area.

[0015] As a preferred solution of the multi-protection intelligent photovoltaic grid-connected cabinet described in the present invention, the partition bars are distributed in multiple directions in the main box body to form a grid structure, and the grid structure includes but is not limited to criss-cross, triangular or honeycomb arrangements.

[0016] As a preferred solution of the multi-protection intelligent photovoltaic grid-connected cabinet described in the present invention, the retaining ring is made of silicone material, the surface of the blocking sphere is smooth, and the expansion sleeve is made of corrugated silicone material.

[0017] The beneficial effects of the present invention are as follows: when the flame directly heats the main box body, the sodium bicarbonate is rapidly decomposed to produce high-pressure carbon dioxide, which is ejected at high speed through the conduit to cover the fire source; at the same time, the expansion sleeve and the spring store energy and accelerate the release of gas when the air pressure increases, generating a more powerful carbon dioxide gas flow, and the fire extinguishing agent covers the electronic components from top to bottom, combined with the relatively small diameter of the conduit to form a high-speed airflow, effectively isolating oxygen, and significantly improving the fire extinguishing response speed and coverage effect.

[0018] Through a three-dimensional heat conduction network and distributed medium storage, uniform heating and efficient heat conduction are achieved. The grid-like distribution of the partitions prevents the accumulation of fire extinguishing agents, ensures the 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 partitions reduces the thickness of the partitions and increases the heat dissipation surface area. Combined with the main box body and partitions made of thermally conductive materials, a heat dissipation fin effect is formed, which significantly shortens the triggering time of the fire extinguishing agent and improves the thermal response efficiency.

[0019] A dual seal and fail-safe mechanism achieves safe pressure storage and targeted fire extinguishing. The adapter's plugging ball and retaining ring seal and lock in the carbon dioxide gas generated when temperatures rise too high, preventing the extinguishing agent from failing. In the event of a fire, high-pressure gas pushes open the blockage for rapid release. If the temperature exceeds the limit, the silicone retaining ring and expansion sleeve melt, diverting the gas to the insulated space outside the box, minimizing the risk of explosion. Simultaneously, the guide vane causes the ejected gas to rotate and diffuse, forming a fan-shaped coverage area, quickly isolating it from oxygen and preventing outside air from entering, ensuring both rapid and safe fire extinguishing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort. Among them:

[0021] Figure 1 It is a three-dimensional diagram of the entire embodiment.

[0022] Figure 2 For this embodiment Figure 1 Front view of .

[0023] Figure 3 For this embodiment Figure 2 A three-dimensional diagram of the fire extinguishing mechanism.

[0024] Figure 4 For this embodiment Figure 3 Partial stereogram.

[0025] Figure 5 It is a three-dimensional diagram of the main box body in the fire extinguishing mechanism of this embodiment.

[0026] Figure 6 For this embodiment Figure 5 Bottom view of the main box.

[0027] Figure 7 For this embodiment Figure 5 Partial cross-sectional view of the main box body.

[0028] Figure 8 This is a three-dimensional cross-sectional view of the fire extinguishing mechanism of this embodiment.

[0029] Figure 9 For this embodiment For this embodiment Figure 8 The plan structure diagram of the fire extinguishing mechanism.

[0030] In the figure; cabinet 100, accommodating box cavity 100a, ventilation grille 100b, cabinet upper skin 100c, support plate 101, support frame 102, various electronic components 103, cabinet door 104;

[0031] Fire extinguishing mechanism 200, main box body 201, cavity 201a, box spacing 201-1, spacer 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;

[0032] Cover plate 204, expansion sleeve 205, opening 205a, expansion cavity 205b, adapter 206, limit end 206a, blocking ball 206b, extension plate 207, spring 208, outer box body 209, connecting piece 209a, thermal insulation space 209b. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0034] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0035] Secondly, the term "one embodiment" or "embodiment" 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 various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive of other embodiments.

[0036] Example 1

[0037] Reference Figures 1 to 3 , which is the first embodiment of the present invention, 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 the electronic components 103 in the cabinet body 100. The fire extinguishing mechanism 200 includes a main box body 201, a cover plate 204, and an outer box body 209. The main box body 201 and the cover plate 204 are sealed together, and the outer box body 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 body and / or the bottom surface of the support plate 101, so that the main box body 201 is located on top of the electronic components 103.

[0038] A conduit 203 is inserted into the independent sealed space between the main box body 201 and the cover plate 204 to communicate with the interior of the cabinet 100 .

[0039] Specifically, in this embodiment, a multi-protection intelligent photovoltaic grid-connected cabinet is provided, which aims 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 box cavity 100a of the cabinet body 100, both of which are used to fix the electronic components 103. In addition, a plurality of ventilation grilles 100b that allow air convection are provided on the side of the cabinet body 100 to achieve a heat dissipation effect. The cabinet body 100 is also provided with a cabinet door 104. The photovoltaic grid-connected cabinet includes a cabinet body 100 and a fire extinguishing mechanism 200 arranged inside the cabinet body 100, wherein the fire extinguishing mechanism 200 is arranged on the upper skin 100c and / or the bottom surface of the support plate 101 in the cabinet, and forms an upper and lower position relationship with the electronic components 103 in the cabinet body 100 to ensure that the fire extinguishing agent can quickly cover the fire source;

[0040] The fire extinguishing mechanism 200 includes a main box body 201, a cover plate 204, and an outer box body 209. The main box body 201 and the cover plate 204 are sealed together to form a first independent sealed space, while the outer box body 209 and the cover plate 204 are sealed together to form a second independent sealed space. Normally, this serves to insulate the medium (sodium bicarbonate) in the first independent sealed space. In particular, the upper skin 100c inside the cabinet is easily exposed to sunlight, and the temperature of the upper skin 100c inside the cabinet is relatively high. If it is not separated, the medium (sodium bicarbonate) can easily evaporate. The cover plate 204 is fixedly connected to the bottom surface of the upper skin 100c inside the cabinet and / or the support plate 101, so that the main box body 201 is located on top of each electronic component 103, facilitating the release of the fire extinguishing agent from top to bottom.

[0041] Fire extinguishing agent release mechanism

[0042] A conduit 203 is inserted into the sealed space formed by the main box 201 and the cover 204, so that it is connected to the interior of the cabinet 100. When the temperature inside the cabinet rises abnormally, the fire extinguishing mechanism 200 can respond quickly:

[0043] Thermal induction trigger: If a fire occurs inside the cabinet, the flames and heat waves will directly exchange heat with the bottom of the main box body 201. The fire extinguishing agent (sodium bicarbonate) in the main box body 201 will expand rapidly due to the heat, triggering the release mechanism.

[0044] Quick release: The fire extinguishing agent directly enters the interior of the cabinet 100 through the conduit 203, avoiding the delay steps such as partition separation and medium falling in the prior art, thereby improving the fire extinguishing response speed.

[0045] Covering fire extinguishing: Since the fire extinguishing mechanism 200 is located above the electronic components 103 and the carbon dioxide gas ejection velocity is increased through the smaller outlet of the conduit 203, the fire extinguishing agent can be ejected at high speed to cover the burning area, effectively blocking oxygen and suppressing the spread of fire;

[0046] Exemplarily, an expansion sleeve 205 is sealed on the cover 204 and protrudes from the top of the conduit 203. An extension plate 207 is provided on the top of the expansion sleeve 205, and a spring 208 is provided between the extension plate 207 and the cover 204. When the medium (sodium bicarbonate) is rapidly decomposed to produce carbon dioxide under 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 main box body 201 and the cover 204 from forming a first independent sealed space through a sealed connection, which may cause the risk of explosion due to excessive air pressure. 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 ejection of gas from the conduit 203, increase the gas ejection rate, enhance the fire extinguishing efficiency and thus reduce losses.

[0047] Example 2

[0048] Reference Figures 3 to 7 , which is the second embodiment of the present invention. In this embodiment, the cavity 201a of the main box body 201 is divided into several sub-cavities 202a by multiple partitions 202 provided on the main box body 201. The main box body 201 and the partitions 202 are both made of heat-conducting materials. Separating the cavity 201a for storing the medium (sodium bicarbonate) by the partitions 202 is conducive to evenly spreading the medium and preventing accumulation during the transportation and installation process, which affects the heating of the medium and produces carbon dioxide gas. At the same time, the main box body 201 and the partitions 202 are both made of heat-conducting materials. The partitions 202 are like heat dissipation fins on the surface of a radiator, thereby improving the heating efficiency of the medium.

[0049] A groove 202b is provided on the back of the main box body 201, and the groove 202b is embedded between the partition bars 202, so that the back of the main box body 201 forms an outer surface composed of multiple side walls 202a-1 and a bottom wall 202a-2, thereby increasing the heat dissipation surface area. This reduces the thickness of the partition bars 202 and increases the heat dissipation surface area.

[0050] The spacers 202 are distributed in a multi-directional staggered manner in the main box body 201 to form a grid structure. The grid structure includes but is not limited to a criss-cross, triangular or honeycomb arrangement. The mesh distribution of the spacers 202 further increases the heat dissipation surface area.

[0051] It is worth mentioning that the three-dimensional heat conduction network is constructed by the spacers 202 and the grooves 202b are embedded between the spacers 202, which solves the two problems of heat conduction delay and uneven medium distribution. The rest is the same as Example 1.

[0052] Example 3

[0053] Reference Figure 3 、 Figure 8 、 Figure 9 , which is the third embodiment of the present invention. This embodiment differs from the first embodiment in that an opening 205a is provided at the top of the expansion sleeve 205 and is sealedly connected 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. A waist hole 203a is provided on the outer surface of the conduit 203 near the top. The conduit 203 is connected to the cabinet through the waist hole 203a. The independent sealed spaces of the main box body 201 and the cover plate 204 are connected. A retaining ring 203b is provided inside the conduit 203 near the bottom. The retaining ring 203b is in sealing contact with the blocking ball 206b at the bottom of the adapter 206.

[0054] Specifically, an adapter 206 in the shape of a rod is sleeved inside the conduit 203, and the limiting end 206a of the upper part is sleeved with the inner wall of the conduit 203 to form a limiting effect, so that the expansion sleeve 205 moves vertically upward after expansion. A retaining ring 203b is also provided near the bottom of the conduit 203. The retaining ring 203b is made of silicone material. A smooth blocking sphere 206b is provided at the bottom of the adapter 206, which prevents gas from being ejected from the conduit 203 when it comes into contact with the retaining ring 203b. Although a small amount of carbon dioxide gas will be generated by the medium when the cabinet is exposed to the sun, the carbon dioxide gas is sealed when the expansion sleeve 205 expands and the elastic potential energy of the spring 208 and the temperature are not enough to generate a large amount of gas, thereby preventing the medium from failing in the event of a fire. In the event of a fire, 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 with sufficient air pressure to achieve a quick response effect. At the same time, if the opening and closing action of the retaining ring 203b and the blocking ball 206b fails, the retaining ring 203b made of silicone material melts at high temperature and the gas can also be ejected without being restricted by the failure of the structure. If the temperature is too high, the expansion sleeve 205, which is also made of silicone material, also melts to allow the gas to flow into the insulating space 209b of the outer box body 209, which is an independent sealed space between the outer box body 209 and the cover plate 204, thereby preventing the sealed space between the cover plate 204 and the main box body 201 from exploding.

[0055] A rod-shaped adapter 206 is sleeved within the conduit 203. A stopper 206a on the upper portion of the adapter 206 engages the inner wall of the conduit 203, forming a stopper structure. This ensures that the expansion sleeve 205's vertical upward movement after expansion allows the adapter 206 to move vertically upward as well. A silicone retaining ring 203b is located near the bottom of the conduit 203, and a smooth blocking sphere 206b is located at the bottom of the adapter 206. When the blocking sphere 206b contacts the retaining ring 203b, it blocks gas from escaping the conduit 203, thereby maintaining a seal when the cabinet is exposed to sunlight and produces a small amount of carbon dioxide.

[0056] 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.

[0057] When a fire occurs, the independent sealed space connected to the box spacing 201-1 between the cover plate 204 and the main box body 201 and the expansion chamber 205b of the expansion sleeve 205 has a large pressure, and the separation time period of the blocking ball 206b and the retaining ring 203b is correspondingly fast and the air pressure is sufficient. The stored carbon dioxide gas is quickly ejected from the conduit 203, achieving a rapid fire extinguishing response.

[0058] If the seal between retaining ring 203b and blocking sphere 206b fails due to aging, the high temperature will melt the silicone retaining ring 203b, releasing gas and preventing the structure from seizing. If the temperature continues to rise, the silicone expansion sleeve 205 will also melt, allowing gas to flow into the insulating space 209b of the outer box 209, forming a secondary sealing barrier to prevent the primary sealed space from exploding due to excessive pressure, ensuring both safety and reliability while extinguishing the fire.

[0059] A guide plate 203c is provided on the inner wall between the bottom of the conduit 203 and the retaining ring 203b. 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 the outside of the fire area, quickly fills the fire area with oxygen, and prevents external air from entering. The structure of the guide plate 203c provided on the inner wall between the bottom of the conduit 203 and the retaining ring 203b satisfies both Example 1 and this embodiment.

[0060] It is important to note that the construction and arrangement of the present application shown in a number of different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, directional changes, etc.) without departing substantially 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 the element may be inverted or otherwise changed, and the nature or number or position of the discrete elements may be altered or changed. Therefore, all such modifications are intended to be included within the scope of the present invention. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "means plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also equivalent structures. Other replacements, modifications, changes, and omissions may be made in the design, operating conditions, and arrangement of the exemplary embodiments without departing from the scope of the present invention. Therefore, the invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0061] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (i.e., those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0062] 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 the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A multi-protection intelligent photovoltaic grid-connected cabinet, characterized by: The fire extinguishing mechanism (200) is provided on the upper cover (100c) of the cabinet (100) and / or on the bottom surface of the support plate (101), so as to form an upper and lower position relationship with each electronic component (103) in the cabinet (100); the fire extinguishing mechanism (200) comprises a main box body (201), a cover plate (204) and an outer box body (209); the main box body (201) and the cover plate (204) are sealed and connected; the outer box body (209) and the cover plate (204) are sealed and connected, thereby forming two independent sealed spaces; the cover plate (204) is connected to the upper cover (100c) of the cabinet and / or on the bottom surface of the support plate (101), so that the main box body (201) is located on top of each electronic component (103); A conduit (203) is inserted into the independent sealed spaces of the main box body (201) and the cover plate (204) to communicate with the interior of the cabinet body (100).

2. The multi-protection intelligent photovoltaic grid-connected cabinet according to claim 1, characterized in that: 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).

3. The multi-protection intelligent photovoltaic grid-connected cabinet according to claim 2, characterized in that: The top of the expansion sleeve (205) is provided with an opening (205a) which is sealedly connected to the outer surface of the adapter (206), and the limiting end (206a) of the adapter (206) is in contact with the inner wall of the catheter (203).

4. The multi-protection intelligent photovoltaic grid-connected cabinet according to claim 3, characterized in that: The outer surface of the conduit (203) near the top is provided with a waist hole (203a) which is connected to the independent sealed space of the main box body (201) and the cover plate (204); the inner part of the conduit (203) near the bottom is provided with a retaining ring (203b), and the retaining ring (203b) is in sealing contact with the blocking ball (206b) at the bottom of the adapter (206).

5. The multi-protection intelligent photovoltaic grid-connected cabinet according to claim 4, characterized in that: A guide plate (203c) is provided on the inner wall between the bottom of the conduit (203) and the retaining ring (203b).

6. The multi-protection intelligent photovoltaic grid-connected cabinet according to claim 2, characterized in that: 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), and 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).

7. The multi-protection intelligent photovoltaic grid-connected cabinet according to claim 1 or 6, characterized in that: The chamber (201a) of the main box body (201) is divided into a plurality of sub-chambers (202a) by a plurality of partition bars (202) provided on the main box body (201); the main box body (201) and the partition bars (202) are both made of heat-conducting materials.

8. The multi-protection intelligent photovoltaic grid-connected cabinet according to claim 7, characterized in that: The back of the main box body (201) is provided with a groove (202b), and the groove (202b) is embedded between the spacers (202), so that the back of the main box body (201) forms an outer surface composed of multiple side wall surfaces (202a-1) and a bottom wall surface (202a-2), thereby increasing the heat dissipation surface area.

9. The multi-protection intelligent photovoltaic grid-connected cabinet according to claim 8, characterized in that: The spacers (202) are distributed in a multi-directional staggered manner within the main box body (201) to form a grid-like structure, and the grid-like structure includes but is not limited to a criss-cross, triangular or honeycomb arrangement.

10. The multi-protection intelligent photovoltaic grid-connected cabinet according to claim 3, characterized in that: The retaining ring (203b) is made of silicone material, the surface of the blocking sphere (206b) is smooth, and the expansion sleeve (205) is made of corrugated silicone material.

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