Fire rapid isolation device suitable for photovoltaic inverter

Abstract

The fire rapid isolation device comprises a box body, the interior of the box body is divided into a working area and a fire extinguishing area which are independent of each other through a telescopic fireproof partition plate, and the telescopic fireproof partition plate is kept in an open state in a normal state so that the two areas can be communicated. In a fire, the switch is switched to a closed state to form a closed space in the working area; a carbon dioxide circulation system and a phase change energy storage device are integrated in the fire extinguishing area, the intelligent control module is in signal connection with the carbon dioxide circulation system and the phase change energy storage device, and unification of rapid fire isolation and equipment safety protection can be achieved.

Description

Technical Field

[0001] The invention relates to a fire rapid isolation device suitable for a photovoltaic inverter, belonging to the technical field of photovoltaic inverters. Background Art

[0002] During operation, the internal circuits of solar photovoltaic inverters generate considerable heat. To ensure proper operation, cooling fans are typically installed inside the inverter to reduce operating temperatures. However, traditional cooling fans are typically located behind the inverter's internal circuitry, making disassembly and maintenance cumbersome. In the event of spontaneous combustion, fire extinguishing is difficult to achieve quickly.

[0003] Currently, Chinese invention patent CN116827079A discloses a solar photovoltaic inverter, including an inverter body and a heat sink detachably connected to the rear side of the inverter body. The heat sink includes a housing mounted on a wall and two centrifugal fans arranged in parallel within the housing. The axial air inlets of the two centrifugal fans are both facing the front side of the housing, and the tangential air outlets of the two centrifugal fans are arranged in opposite directions. The left and right side walls of the housing are each provided with a main air outlet for docking with the tangential air outlets of the two centrifugal fans. The front side of the housing is provided with an opening for exposing the axial air inlets of the two centrifugal fans. The inverter body includes a housing, main air inlets provided on the left and right side walls of the housing, and two exhaust ports provided on the rear side wall of the housing. When the inverter body is mounted on the front side of the heat sink, the two exhaust ports can be respectively docked with the axial air inlets of the two centrifugal fans. Conversely, when the inverter body is separated from the heat sink, the two exhaust ports can be separated from the corresponding axial air inlets. The aforementioned patent extracts heat generated by the inverter through an exhaust port and discharges it through a tangential air outlet and a main air outlet, thereby reducing the inverter's operating temperature. However, in the event of spontaneous combustion within the inverter, while quick disassembly facilitates fire extinguishing, it is inefficient and inconvenient to disassemble, preventing rapid fire extinguishing. Therefore, there is a need for a rapid fire isolation device for photovoltaic inverters that can ensure effective heat dissipation and automatically extinguish fires in the event of spontaneous combustion. Summary of the Invention

[0004] In order to solve the above problems existing in the prior art, the present invention provides a fire rapid isolation device applicable to a photovoltaic inverter, which can achieve the unity of fire rapid isolation and equipment safety protection.

[0005] The technical solutions of the present invention are as follows:

[0006] A rapid fire isolation device suitable for a photovoltaic inverter comprises a housing, the interior of the housing being divided into a mutually independent working area and a fire extinguishing area by a retractable fireproof partition. The retractable fireproof partition is normally open to connect the two areas, and is switched to a closed state in the event of a fire to form a confined space in the working area. The fire extinguishing area is integrated with a carbon dioxide circulation system and a phase change energy storage device, and also includes an intelligent control module, which is signal-connected to the carbon dioxide circulation system and the phase change energy storage device.

[0007] In which, the carbon dioxide circulation system includes at least one high-pressure carbon dioxide cylinder, a compressor, a condenser, an evaporator and a liquid storage tank. The high-pressure carbon dioxide cylinder is connected to the main line through a first solenoid valve; one end of the main line is connected to the air inlet end of the compressor, and the air outlet end of the compressor is connected to the high-pressure inlet of the condenser; the condenser has a built-in cooling coil and a heat dissipation fan for cooling the gaseous carbon dioxide; an expansion valve is installed between the condenser outlet and the evaporator for throttling and reducing the pressure of liquid carbon dioxide; the liquid storage tank inlet is connected to the evaporator outlet through a one-way valve, and the liquid storage tank outlet is connected to the release pipe through a third solenoid valve, and the end of the release pipe extends to the top of the working area.

[0008] The carbon dioxide circulation system further comprises a pressure balancing component, which comprises a safety relief valve and a reflux pipe, and the reflux pipe is connected to the top of the liquid storage tank and the main pipeline.

[0009] In which, the phase change energy storage device includes a phase change shell, the interior of the phase change shell is divided into a honeycomb cavity and a composite phase change material is arranged in the honeycomb cavity; a heat conduction plate is welded to the outer wall of the evaporator, and the other side of the heat conduction plate is embedded in the bottom of the phase change shell; a heat dissipation fin is arranged on the top of the phase change shell; a thermoelectric semiconductor refrigeration plate is attached to the side of the phase change shell, the cold end of the thermoelectric semiconductor refrigeration plate faces the phase change shell, and the hot end is connected to the heat dissipation fin; a phase change state sensor is embedded in the honeycomb cavity for real-time monitoring of the solid-liquid phase change ratio of the composite phase change material.

[0010] Wherein, a thermal conductive silicone grease layer is filled between the evaporator coil and the heat conducting plate; and the composite phase change material is formed by mixing an organic fatty acid mixture and graphene nanosheets.

[0011] The phase change energy storage device further includes a dual-channel heat pipe, one end of which is connected to the heat conducting plate, and the other end of which extends to the side wall of the fire extinguishing area away from the working area.

[0012] Among them, the retractable fireproof partition includes an air permeable plate and a partition plate, the air permeable plate includes a U-shaped frame, a vertical slide rail is vertically arranged in the middle of the U-shaped frame, and a ventilation net is arranged between the U-shaped frame and the vertical slide rail; the end of the partition plate is hinged with a sliding part that is slidably arranged with the vertical slide rail, and the side walls at both ends of the partition plate match the inner side walls of the U-shaped frame, the U-shaped frame and the partition plate are both made of memory metal and form a stacked square plate structure after heating; the end side wall of the air permeable plate is provided with a first rotating rod, and the end side wall of the partition plate is provided with a second rotating rod, and the air permeable plate and the partition plate are respectively connected to the wall of the box through the first rotating rod and the second rotating rod.

[0013] In which, a deformable structure is provided at the end of the partition plate; the deformable structure includes a flexible shell, the space between the flexible shell and the end of the partition plate is filled with electrorheological fluid, a locking groove is provided at the bottom inner side of the U-shaped frame, a first electrode block is provided at the upper part of the side wall of the partition plate, and a second electrode block is provided at the lower part of the inner side wall of the U-shaped frame, and the first electrode block and the second electrode block are in contact with each other to provide an activation signal for the electrorheological fluid.

[0014] The present invention has the following beneficial effects:

[0015] The present invention uses the memory metal material of the retractable fireproof partition to automatically fold and deform when exposed to high temperatures, allowing the partition panels to move downward and stack along vertical slide rails. Combined with the locking mechanism in which the electrorheological fluid solidifies instantly upon contact with the electrode blocks, a gapless sealed barrier is formed, completely blocking the spread of flames to the fire extinguishing area.

[0016] The present invention also provides a carbon dioxide circulation system that regenerates gaseous CO2 into liquid through a compressor and a condenser and stores it in a liquid storage tank. The release pipe is directly connected to the top of the enclosed working area, so as to achieve directional injection of the fire extinguishing agent without leakage and avoid fire extinguishing failure caused by insufficient concentration.

[0017] The present invention also provides a composite phase change material of the phase change energy storage device to absorb the heat released during the fire extinguishing process, and the thermoelectric semiconductor refrigeration plate actively enhances heat dissipation to ensure that the surface temperature of the equipment is maintained in a low area as much as possible, thereby achieving the unity of rapid fire isolation and equipment safety protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a wireframe diagram of the carbon dioxide circulation system of the present invention;

[0019] Figure 2 A side half-section view of the box body of the present invention;

[0020] Figure 3 A top view of the phase change energy storage device of the present invention;

[0021] Figure 4 This is a front view of the phase change energy storage device of the present invention;

[0022] Figure 5 This is a schematic diagram of the retractable fireproof partition of the present invention;

[0023] Figure 6 This is a schematic diagram of the retractable fireproof partition of the present invention folding after being heated.

[0024] The reference numerals in the figures are as follows:

[0025] 1. Box; 2. Retractable fireproof partition; 101. Working area; 102. Fire extinguishing area; 4. High-pressure carbon dioxide cylinder; 42. Compressor; 43. Condenser; 44. Evaporator; 45. Liquid storage tank; 46. First solenoid valve; 47. Main line; 48. Expansion valve; 5. Release pipe; 451. Check valve; 452. Third solenoid valve; 49. Safety relief valve; 41. Return pipe; 31. Phase change shell; 32. Honeycomb cavity; 33. Heat conducting plate; 34. Heat dissipating fins; 35. Thermoelectric semiconductor refrigeration plate; 36. Dual-channel heat pipe; 22. Partition plate; 211. U-shaped frame; 23. Vertical slide rail; 24. Ventilation net; 25. Sliding member; 212. First rotating rod; 221. Second rotating rod; 222. Flexible housing; 223. Electrorheological fluid; 213. Locking groove; 224. First electrode block; 214. Second electrode block. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] See also Figures 1 to 6 , the invention provides a technical solution:

[0028] The fire rapid isolation device for photovoltaic inverters of this embodiment includes a box body 1. The interior of the box body 1 is divided into a mutually independent working area 101 and a fire extinguishing area 102 by a retractable fireproof partition 2. The retractable fireproof partition 2 is kept in an open state under normal conditions to connect the two areas. In the event of a fire, it is switched to a closed state to form a closed space in the working area 101. The fire extinguishing area 102 is integrated with a carbon dioxide circulation system and a phase change energy storage device, and also includes an intelligent control module. The intelligent control module is connected to the carbon dioxide circulation system and the phase change energy storage device by signal. The photovoltaic inverter is installed in the working area 101, and the fire extinguishing area 102 is pre-installed with a fire extinguishing and energy storage module. Panel 2 is normally open to ensure heat dissipation of the equipment; in the event of a fire, a confined space is quickly formed to prevent the spread of fire and create an effective working environment for the fire extinguishing system; specifically, the intelligent control module analyzes the data of the temperature sensor set in the working area 101 and the smoke detector set in the fire extinguishing area 102 in real time to determine the fire level; at the same time, the intelligent control module can continuously analyze the environmental status and monitor it in real time through the triple sensors of temperature, smoke and gas concentration; when a sudden temperature rise and the smoke concentration exceeds the standard at the same time, it is determined to be a fire, and action instructions are sent to the fire partition, CO2 system, and phase change device at the same time to ensure that each subsystem responds synchronously and coordinates the command.

[0029] The carbon dioxide circulation system includes at least one high-pressure carbon dioxide cylinder 4, a compressor 42, a condenser 43, an evaporator 44 and a liquid storage tank 45. The high-pressure carbon dioxide cylinder 4 is connected to the main line 47 through a first solenoid valve 46; one end of the main line 47 is connected to the air inlet of the compressor 42, and the air outlet of the compressor 42 is connected to the high-pressure inlet of the condenser 43; the condenser 43 has a built-in cooling coil and a heat dissipation fan for cooling the gaseous carbon dioxide; an expansion valve 48 is installed between the outlet of the condenser 43 and the evaporator 44 for throttling and reducing the pressure of the liquid carbon dioxide; the inlet of the liquid storage tank 45 is connected to the outlet of the evaporator 44 through a one-way valve 451, and the outlet of the liquid storage tank 45 is connected to the release pipe 5 through a third solenoid valve 452, and the end of the release pipe 5 The end extends to the top of the working area 101; the specific steps are: open the first solenoid valve 46, the cylinder 4 releases CO2 to the main line 47; then the compressor 42 increases the pressure, and then the condenser 43 liquefies it, passes through the expansion valve 48 to throttle, and then uses the evaporator 44 to vaporize and absorb heat, which can be used to absorb the high working temperature in the working area 101; at this time, the CO2 is stored in the liquid storage tank 45 through the one-way valve 451, and the CO2 in the liquid storage tank 45 is atomized and sprayed to form a suffocating environment. At the same time, the low-temperature vaporization absorbs a large amount of heat, realizing the "cooling + oxygen isolation" dual fire extinguishing mechanism. In the event of a fire, the third solenoid valve 452 is opened and the fire is extinguished by spraying through the release pipe 5; realizing efficient liquefied storage and on-demand release of CO2, reducing the replacement frequency of the cylinder 4, and improving the fire extinguishing response speed;

[0030] The carbon dioxide circulation system also includes a pressure balancing component, which includes a safety relief valve 49 and a return pipe 41. The return pipe 41 connects the top of the liquid storage tank 45 with the main line 47. When the pressure of the liquid storage tank 45 exceeds the threshold, the safety relief valve 49 automatically opens, and the excess gas returns to the main line 47 through the return pipe 41 and is re-liquefied. It is used to maintain system pressure stability, prevent overpressure leakage, and improve equipment safety.

[0031] The phase change energy storage device includes a phase change shell 31, which is divided into a honeycomb cavity 32 inside and a composite phase change material is arranged in the honeycomb cavity 32; a heat conducting plate 33 is welded to the outer wall of the evaporator 44, and the other side of the heat conducting plate 33 is embedded in the bottom of the phase change shell 31; a heat dissipation fin 34 is arranged on the top of the phase change shell 31; a thermoelectric semiconductor refrigeration plate 35 is attached to the side of the phase change shell 31, the cold end of the thermoelectric semiconductor refrigeration plate 35 faces the phase change shell 31, and the hot end is connected to the heat dissipation fin 34; a phase change state sensor is embedded in the honeycomb cavity 32 for real-time monitoring of the solid-liquid phase change ratio of the composite phase change material. Specifically, it includes heat absorption mode: the cold energy of the evaporator 44 is transferred to the composite phase change material through the heat conduction plate 33, causing it to melt and store cold energy; cold release mode: when a fire occurs, the thermoelectric semiconductor refrigeration plate 35 is activated (the cold end absorbs heat), accelerating the solidification of the phase change material to release cold energy; the heat exchange area is increased by the honeycomb cavity 32, and the thermoelectric semiconductor refrigeration plate 35 is used to dynamically adjust the temperature to suppress the temperature rise of the equipment in the fire extinguishing area

[0032] A layer of thermal grease is filled between the evaporator 44 coil and the heat conducting plate 33; the composite phase change material is formed by mixing a mixture of organic fatty acids and graphene nanosheets; the thermal grease fills the microscopic gaps, and the graphene nanosheets are evenly mixed into the fatty acid matrix by ultrasonic dispersion; the thermal grease reduces the contact thermal resistance, and the graphene forms a three-dimensional heat conducting network, thereby improving the thermal conductivity of the composite phase change material.

[0033] The phase change energy storage device also includes a dual-channel heat pipe 36, one end of the dual-channel heat pipe 36 is connected to the heat conducting plate 33, and the other end extends to the side wall of the fire extinguishing area 102 away from the working area 101; the evaporation section of the dual-channel heat pipe 36 is welded to the heat conducting plate 33, and the condensation section extends to the side wall of the box body, using the natural convection of the external air to dissipate heat, thereby enhancing the daily heat dissipation efficiency, avoiding long-term high-load operation of the thermoelectric semiconductor refrigeration plate 35, and reducing energy consumption.

[0034] The retractable fireproof partition 2 includes a breathable plate and a partition plate 22. The breathable plate includes a U-shaped frame 211. A vertical slide rail 23 is vertically arranged in the middle of the U-shaped frame 211. A ventilation net 24 is arranged between the U-shaped frame 211 and the vertical slide rail 23. The end of the partition plate 22 is hinged with a sliding member 25 that slides with the vertical slide rail 23. The side walls of the partition plate 22 at both ends match the inner side walls of the U-shaped frame 211. The U-shaped frame 211 and the partition plate 22 are both made of memory metal and form a stacked square plate structure after heating. The end side wall of the breathable plate is provided with a first rotating The movable rod 212 and the end side wall of the partition plate 22 are provided with a second rotating rod 221. The air-permeable plate and the partition plate 22 are connected to the wall of the box body 1 through the first rotating rod 212 and the second rotating rod 221 respectively; in the open state, the partition plate 22 moves up along the vertical slide rail 23, and the ventilation net 24 is unobstructed; when a fire occurs, it needs to be converted to a closed state. During a fire, the memory metal is deformed by heat, and the partition plate 22 moves down and stacked to seal; the memory metal responds to high temperature autonomously, the sliding part 25 and the slide rail 23 ensure precise movement, and the ventilation net 24 maintains the heat dissipation requirements of the equipment at normal conditions.

[0035] A deformable structure is provided at the end of the partition plate 22; the deformable structure includes a flexible shell 222, and the space between the flexible shell 222 and the end of the partition plate 22 is filled with an electrorheological fluid 223. A locking groove 213 is provided at the bottom inner side of the U-shaped frame 211, and a first electrode block 224 is provided at the upper part of the side wall of the partition plate 22, and a second electrode block 214 is provided at the lower part of the inner wall of the U-shaped frame 211. The first electrode block 224 and the second electrode block 214 are in contact with each other to provide an activation signal for the electrorheological fluid 223.

[0036] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention's description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A fire rapid isolation device suitable for photovoltaic inverters, characterized by: The invention comprises a box body (1), wherein the interior of the box body (1) is divided into a mutually independent working area (101) and a fire extinguishing area (102) by a retractable fireproof partition (2); the retractable fireproof partition (2) is kept in an open state under normal conditions so that the two areas are connected, and is switched to a closed state in the event of a fire so that the working area (101) forms a closed space; the fire extinguishing area (102) is integrated with a carbon dioxide circulation system and a phase change energy storage device, and further comprises an intelligent control module, which is signal-connected to the carbon dioxide circulation system and the phase change energy storage device.

2. A fire rapid isolation device for a photovoltaic inverter according to claim 1, characterized in that: The carbon dioxide circulation system comprises at least one high-pressure carbon dioxide cylinder (4), a compressor (42), a condenser (43), an evaporator (44) and a liquid storage tank (45). The high-pressure carbon dioxide cylinder (4) is connected to a main line (47) through a first solenoid valve (46); one end of the main line (47) is connected to the air inlet of the compressor (42), and the air outlet of the compressor (42) is connected to the high-pressure inlet of the condenser (43); the condenser (43) is equipped with a built-in cooling coil and a heat dissipation fan for cooling the gaseous carbon dioxide; an expansion valve (48) is installed between the outlet of the condenser (43) and the evaporator (44) for throttling and reducing the pressure of the liquid carbon dioxide; the inlet of the liquid storage tank (45) is connected to the outlet of the evaporator (44) through a one-way valve (451), and the outlet of the liquid storage tank (45) is connected to a release pipe (5) through a third solenoid valve (452), and the end of the release pipe (5) extends to the top of the working area (101).

3. A fire rapid isolation device for a photovoltaic inverter according to claim 2, characterized in that: The carbon dioxide circulation system further comprises a pressure balancing assembly, the pressure balancing assembly comprising a safety relief valve (49) and a return pipe (41), the return pipe (41) being connected to the top of the liquid storage tank (45) and the main pipe (47), and the safety relief valve (49) being arranged on the return pipe (41).

4. A fire rapid isolation device for a photovoltaic inverter according to claim 1, characterized in that: The phase change energy storage device comprises a phase change shell (31), wherein the interior of the phase change shell (31) is divided into a honeycomb cavity (32), and a composite phase change material is arranged in the honeycomb cavity (32); a heat conducting plate (33) is welded to the outer wall of the evaporator (44), and the other side of the heat conducting plate (33) is embedded in the bottom of the phase change shell (31); a heat dissipation fin (34) is arranged on the top of the phase change shell (31); a thermoelectric semiconductor refrigeration plate (35) is attached to the side of the phase change shell (31), the cold end of the thermoelectric semiconductor refrigeration plate (35) faces the phase change shell (31), and the hot end is connected to the heat dissipation fin (34); a phase change state sensor is embedded in the honeycomb cavity (32) for real-time monitoring of the solid-liquid phase change ratio of the composite phase change material.

5. A fire rapid isolation device for a photovoltaic inverter according to claim 4, characterized in that: A heat-conducting silicone grease layer is filled between the evaporator (44) coil and the heat-conducting plate (33); and the composite phase-change material is formed by mixing an organic fatty acid mixture and graphene nanosheets.

6. A fire rapid isolation device for a photovoltaic inverter according to claim 4, characterized in that: The phase-change energy storage device further comprises a dual-channel heat pipe (36), one end of the dual-channel heat pipe (36) being connected to the heat conducting plate (33), and the other end extending to a side wall of the fire extinguishing area (102) away from the working area (101).

7. A fire rapid isolation device for a photovoltaic inverter according to claim 1, characterized in that: The retractable fireproof partition (2) comprises an air-permeable plate and a partition plate (22), wherein the air-permeable plate comprises a U-shaped frame (211), a vertical slide rail (23) is vertically arranged in the middle of the U-shaped frame (211), and a ventilation net (24) is arranged between the U-shaped frame (211) and the vertical slide rail (23); a sliding member (25) is hinged at the end of the partition plate (22) and is slidably arranged with the vertical slide rail (23), and the side walls of both ends of the partition plate (22) are in contact with the U-shaped frame. The inner side wall of the U-shaped frame (211) matches the inner side wall of the U-shaped frame (211), and the U-shaped frame (211) and the partition plate (22) are both made of memory metal and form a stacked square plate structure after being heated; the end side wall of the air permeable plate is provided with a first rotating rod (212), and the end side wall of the partition plate (22) is provided with a second rotating rod (221), and the air permeable plate and the partition plate (22) are respectively connected to the wall of the box body (1) through the first rotating rod (212) and the second rotating rod (221).

8. A fire rapid isolation device for a photovoltaic inverter according to claim 7, characterized in that: The end of the partition plate (22) is provided with a deformable structure; the deformable structure comprises a flexible shell (222); the space between the flexible shell (222) and the end of the partition plate (22) is filled with an electrorheological fluid (223); the inner bottom of the U-shaped frame (211) is provided with a locking groove (213); the upper part of the side wall of the partition plate (22) is provided with a first electrode block (224); the lower part of the inner wall of the U-shaped frame (211) is provided with a second electrode block (214); the first electrode block (224) and the second electrode block (214) are in contact with each other to provide an activation signal for the electrorheological fluid (223).

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