Automatic Fire Extinguishing Charging Pile with Multi-Point Explosion-Proof Module and Its Automatic Fire Extinguishing Method

Abstract

The present invention discloses an automatic fire extinguishing charging pile for multi-point explosion-proof modules, which includes a charging pile cabinet body. The interior of the charging pile cabinet body is an electrical compartment. At multiple points in the electrical compartment, aerosol fire extinguishers with automatic triggering functions are respectively installed. The aerosol fire extinguishers can release aerosol flame retardant substances into the electrical compartment. There is a grille ventilation window on the side of the charging pile cabinet body. Each aerosol fire extinguisher automatically releases a large amount of flame retardant aerosols, FK-5-1-12 in aerosol form, pearlescent alumina, etc. into the electrical compartment. Since the aerosol fire extinguishers are distributed at multiple points in the electrical compartment, the electrical compartment will be quickly flooded by the aerosol flame retardant substances, thus achieving the purpose of quickly extinguishing the fire in a short time.

Description

Technical Field

[0001] The present invention belongs to the field of charging pile fire extinguishing. Background Art

[0002] When a fire breaks out inside the charging pile cabinet, the fire is likely to spread rapidly, which may cause the electric vehicles being charged nearby to catch fire as well. Therefore, a fire extinguishing device capable of automatically releasing flame retardant substances needs to be installed inside the charging pile cabinet;

[0003] Using an aerosol fire extinguisher inside the charging pile cabinet is a good choice. After the aerosol fire extinguisher is activated, it will automatically release a large amount of flame retardant aerosol, aerosol-shaped FK-5-1-12, pearlescent alumina, etc. into the electrical compartment. The electrical compartment will be quickly flooded with the aerosol flame retardant substance, thus achieving the purpose of quickly extinguishing the fire in a short time; if after this stage, although the open fire is quickly extinguished due to the isolation of oxygen by the aerogel mist group in a short time, since the temperature of the combustibles in the electrical compartment may still be within the range of the ignition point, if the aerosol in the electrical compartment dissipates quickly, there is a possibility of re-ignition in the electrical compartment. Summary of the Invention

[0004] Object of the Invention: In order to overcome the deficiencies in the prior art, the present invention provides an automatic fire extinguishing charging pile with multi-point explosion-proof modules and its automatic fire extinguishing method, which can suppress the re-ignition of fires inside the cabinet.

[0005] Technical Solution: To achieve the above object, the automatic fire extinguishing charging pile with multi-point explosion-proof modules of the present invention includes a charging pile cabinet. The inside of the charging pile cabinet is an electrical compartment. Aerosol fire extinguishers with automatic triggering functions are respectively installed at multiple points in the electrical compartment. The aerosol fire extinguishers can release aerosol flame retardant substances into the electrical compartment; there is a grid ventilation window on the side of the charging pile cabinet. The grid ventilation window includes two modes: normal state and fire extinguishing.

[0006] In the normal state, the grid ventilation window connects the electrical compartment with the external ventilation; after the grid ventilation window enters the fire extinguishing mode, it can release cooling or flame retardant substances into the electrical compartment and cut off the ventilation state.

[0007] Furthermore, a temperature sensing module is provided inside each aerosol fire extinguisher.

[0008] Furthermore, an exhaust fan is provided at the bottom of the electrical compartment.

[0009] Furthermore, the grid ventilation window includes a window frame. A number of horizontal strip-shaped grid plates are evenly arranged in an array from top to bottom at equal intervals inside the window frame. A grid plate rotating shaft is integrally arranged along the length extension direction on each grid plate. The two ends of the grid plate rotating shaft are rotationally matched with the bearing holes on the inner side of the window frame through bearings, so that each grid plate can freely rotate around the axis of the corresponding grid plate rotating shaft.

[0010] Furthermore, a ventilation cross bar is clamped between any two adjacent grille plates; both ends of the ventilation cross bar are fixedly connected to the window frame.

[0011] Furthermore, the ventilation cross bar includes a cross cylinder, and both ends of the cross cylinder are fixedly connected to the window frame; a number of sunken cylinder wall segments a are equidistantly distributed along the axial direction of the cross cylinder, and a circle of outwardly bulging outer bulging elastic annular walls are arranged outside each sunken cylinder wall segment a; a sealed annular flame retardant liquid pressure storage bin is formed between the outer bulging elastic annular wall and the sunken cylinder wall segment a; each annular flame retardant liquid pressure storage bin is filled with flame retardant liquid, so that a number of equidistantly distributed outer bulging elastic annular walls are formed along the length direction of the outer wall of the ventilation cross bar, and ventilation gaps are formed between any two adjacent outer bulging elastic annular walls on the ventilation cross bar.

[0012] Furthermore, the grille plate is divided into a coplanar upper leaf of the grille plate and a lower leaf of the grille plate with the grille plate rotating shaft as the boundary; the plate surface of the grille plate is an inclined surface, and the upper leaf of the grille plate on the grille plate is closer to the inside of the electrical bin than the lower leaf of the grille plate;

[0013] From the axial perspective of the grille plate rotating shaft, the lower leaf of the grille plate is wider than the upper leaf of the grille plate, so that the lower leaf of the grille plate is heavier than the upper leaf of the grille plate. In the free state, the gravity of the lower leaf of the grille plate overcomes the gravity of the upper leaf of the grille plate, so that the lower leaf of the grille plate has a downward swing trend around the axis of the grille plate rotating shaft, and the upper leaf of the grille plate has an upward swing trend around the axis of the grille plate rotating shaft; thereby making the upper surface of the upper leaf of the grille plate tangent to each outer bulging elastic annular wall on an upper ventilation cross bar above; the lower surface of the lower leaf of the grille plate is tangent to each outer bulging elastic annular wall on a lower ventilation cross bar below.

[0014] Furthermore, when the pressure in each annular flame retardant liquid pressure storage bin drops to normal atmospheric pressure, each outwardly bulging outer bulging elastic annular wall automatically contracts under the action of its own elastic restoring force until the outer bulging elastic annular wall contracts into a cylindrical elastic ring wall a, making the outer diameters of all parts of the ventilation cross bar tend to be the same, and making the original ventilation gaps disappear; at the same time, under the drive of gravity, the heavier lower leaf of the grille plate automatically has a downward swing around the axis of the grille plate rotating shaft, and the lighter upper leaf of the grille plate automatically has an upward swing around the axis of the grille plate rotating shaft; making the lower surface of the lower leaf of the grille plate tangent to a ventilation cross bar with the same outer diameter below, and the upper surface of the upper leaf of the grille plate tangent to a ventilation cross bar with the same outer diameter above; thereby making the grille ventilation window relatively closed as a whole and achieving the purpose of blocking external air from entering the electrical bin;

[0015] A number of flame retardant liquid injectors with nozzles facing the inside of the electrical bin are fixedly installed on the inner side of the cross beam of the window frame;

[0016] A longitudinal liquid guiding channel is arranged inside the longitudinal beam of the window frame, and a transverse liquid guiding channel is arranged inside the transverse beam of the window frame. One side of the transverse liquid guiding channel is communicated with the liquid inlet ends of the flame retardant liquid injectors through a plurality of liquid inlet channels; the upper end of the longitudinal liquid guiding channel is communicated with the transverse liquid guiding channel;

[0017] A central tube is coaxially arranged with the axis of each transverse cylinder, and the central tubes are communicated with each other through a plurality of vertically connected connecting tubes to connect each annular flame retardant liquid accumulator storage bin. The ends of each central tube are vertically communicated with the longitudinal liquid guiding channel.

[0018] Further, when a fire breaks out, the aerosol fire extinguisher automatically releases a large amount of aerosol with flame retardant properties into the electrical bin; if re-ignition occurs within a short time after the end of this stage, the control of each flame retardant liquid injector immediately sprays carbon tetrachloride liquid quickly and evenly into the electrical bin through the nozzle.

[0019] Beneficial effects: On the basis of aerosol fire extinguishing, once re-ignition occurs in the electrical bin, each flame retardant liquid injector sprays carbon tetrachloride liquid quickly and evenly into the electrical bin through the nozzle, which not only plays a role in isolating the air, but also absorbs heat during the evaporation process of carbon tetrachloride, thereby reducing the temperature in the flame area and further accelerating the fire extinguishing process; while each flame retardant liquid injector gradually sprays out carbon tetrachloride liquid through the nozzle, the carbon tetrachloride liquid in each annular flame retardant liquid accumulator storage bin is gradually discharged and consumed. During the above process, each outwardly bulging elastic annular wall automatically contracts under the action of its own elastic restoring force until the carbon tetrachloride liquid in each annular flame retardant liquid accumulator storage bin is completely discharged, and the outwardly bulging elastic annular wall shrinks into a cylindrical elastic annular wall, making the outer diameters of all parts of the ventilation cross bar tend to be the same and eliminating the original ventilation gaps; at the same time, under the drive of gravity, the heavier lower leaf of the grille plate automatically swings downward around the axis of the grille plate rotating shaft, and the lighter upper leaf of the grille plate automatically swings upward around the axis of the grille plate rotating shaft; making the lower surface of the lower leaf of the grille plate tangent to a ventilation cross bar with the same outer diameter below, and the upper surface of the upper leaf of the grille plate tangent to a ventilation cross bar with the same outer diameter above; thereby making the grille ventilation window relatively closed as a whole and achieving the purpose of blocking external air from entering the electrical bin; thus playing a role in inhibiting the escape of vaporized carbon tetrachloride flame retardant steam in the electrical bin and further playing a role in inhibiting re-ignition. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Appendix Figure 1 is the overall schematic diagram of this solution;

[0021] Appendix Figure 2 is the first perspective view of the grille ventilation window, which can also be called the outer perspective view;

[0022] Appendix Figure 3 is the second perspective view of the grille ventilation window, which can also be called the inner perspective view;

[0023] Attached Figure 4 is the sectional view of the attached Figure 2 ;

[0024] Attached Figure 5 is the view in the direction of A of the attached Figure 4 ;

[0025] Attached Figure 6 is the three - dimensional view of the enlarged partial view of the attached Figure 5 ;

[0026] Attached Figure 7 is the dissection view of the ventilation cross bar

[0027] Attached Figure 8 is the schematic diagram of two states of the ventilation cross bar under normal state and after fire - extinguishing state

[0028] Attached Figure 9 is Figure 8 two states of the partial sectional view at the marked position 22 of the attached Detailed implementation mode

[0029] The present invention will be further described in conjunction with the accompanying drawings as follows.

[0030] As shown in the attached Figures 1 to 9 the automatic fire - extinguishing charging pile with multi - point explosion - proof module includes a charging pile cabinet body 2. Inside the charging pile cabinet body 2 is an electrical bin 1. At multiple positions in the electrical bin 1, aerosol fire extinguishers 6 with automatic triggering functions are respectively installed. The aerosol fire extinguishers 6 in this case are existing devices, and the aerosol fire extinguishers 6 can release aerosol flame - retardant substances into the electrical bin 1. A temperature sensing module is provided in each aerosol fire extinguisher 6. When the temperature sensing module detects that the temperature reaches the threshold value, the aerosol fire extinguisher 6 automatically releases aerosol flame - retardant substances, such as FK - 5 - 1 - 12 and pearlescent alumina in aerosol form.

[0031] In order to prevent re - ignition after the aerosol fire extinguisher 6 extinguishes the fire, there is a grille ventilation window 3 on the side of the charging pile cabinet body 2 in this case. The grille ventilation window 3 includes two modes: normal state and fire - extinguishing state. The grille ventilation window 3 ventilates and connects the electrical bin 1 with the outside under normal state; after the grille ventilation window 3 enters the fire - extinguishing mode, it can release cooling or flame - retardant substances into the electrical bin 1 and cut off the ventilation state, so as to achieve the effect of preventing re - ignition.

[0032] As Figure 1An exhaust fan is provided at the bottom of the electrical compartment 1, and the exhaust fan can extract the air inside the electrical compartment 1. When the charging pile cabinet 2 is operating normally, the exhaust fan at the bottom of the electrical compartment 1 operates normally. Under the action of negative pressure, the external relatively cold air enters the electrical compartment 1 through the ventilation gaps 100 formed between any two adjacent outer bulging elastic annular walls 16 on each ventilation cross bar 18, so as to achieve a normal air-cooling cycle effect. When a fire occurs inside, the exhaust fan automatically shuts down.

[0033] As Figures 2 to 9 shown, the grille ventilation window 3 includes a window frame 7. A number of horizontal strip-shaped grille plates 12 are evenly arranged in an array from top to bottom at equal intervals inside the window frame 7. A grille plate rotating shaft 13 is integrally provided on each grille plate 12 along the length extension direction. The two ends of the grille plate rotating shaft 13 are rotatably matched with the bearing holes on the inner side of the window frame 7 through bearings, so that each grille plate 12 can freely rotate around the axis of the corresponding grille plate rotating shaft 13. A ventilation cross bar 18 is clamped between any two adjacent grille plates 12. The two ends of the ventilation cross bar 18 are fixedly connected to the window frame 7.

[0034] The ventilation cross bar 18 includes a cross cylinder 14. The two ends of the cross cylinder 14 are fixedly connected to the window frame 7. A number of sunken cylinder wall segments 14a are evenly distributed along the axial direction of the cross cylinder 14. An outer bulging elastic annular wall 16 in an outward bulging state is provided outside each sunken cylinder wall segment 14a. The outer bulging elastic annular wall 16 can be made of elastic silica gel. The property of silica gel is stable and it is immiscible and does not react with carbon tetrachloride in this case. A closed annular flame retardant liquid pressure storage chamber 21 is formed between the outer bulging elastic annular wall 16 and the sunken cylinder wall segment 14a. Each annular flame retardant liquid pressure storage chamber 21 is filled with a flame retardant liquid, such as carbon tetrachloride liquid, to make the outer bulging elastic annular wall 16 bulge outwards. Thus, a number of equally spaced outer bulging elastic annular walls 16 are formed on the outer wall of the ventilation cross bar 18 along the length direction, and ventilation gaps 100 are formed between any two adjacent outer bulging elastic annular walls 16 on the ventilation cross bar 18, as Figure 8 shown.

[0035] As Figure 5 and 6, the grille plate 12 is divided into a coplanar upper leaf 12.1 and a lower leaf 12.2 of the grille plate with the grille plate rotating shaft 13 as the boundary; the plate surface of the grille plate 12 is an inclined surface, and the upper leaf 12.1 of the grille plate 12 is closer to the inside of the electrical compartment 1 than the lower leaf 12.2; in the axial view of the grille plate rotating shaft 13, the lower leaf 12.2 of the grille plate is wider than the upper leaf 12.1, making the lower leaf 12.2 of the grille plate heavier than the upper leaf 12.1. In the free state, the gravity of the lower leaf 12.2 of the grille plate overcomes the gravity of the upper leaf 12.1 of the grille plate, causing the grille plate rotating shaft 13 to have a tendency to rotate clockwise automatically, so that the lower leaf 12.2 of the grille plate has a downward swing tendency around the axis of the grille plate rotating shaft 13, and the upper leaf 12.1 of the grille plate has an upward swing tendency around the axis of the grille plate rotating shaft 13; thus, the upper surface of the upper leaf 12.1 of the grille plate 12 is tangent to the outer bulging elastic annular walls 16 on an upper ventilation cross bar 18; the lower surface of the lower leaf 12.2 of the grille plate 12 is tangent to the outer bulging elastic annular walls 16 on a lower ventilation cross bar 18; the air outside the electric pile cabinet body 2 can enter the electrical compartment 1 through the ventilation gaps 100 formed between any two adjacent outer bulging elastic annular walls 16 on each ventilation cross bar 18.

[0036] When the pressure in each annular flame retardant liquid storage and pressure accumulation chamber 21 drops to normal atmospheric pressure, each outer bulging elastic annular wall 16 in the outward bulging state automatically contracts under the action of its own elastic restoring force until the outer bulging elastic annular wall 16 contracts into a cylindrical elastic ring wall 16a, making the outer diameters of all parts of the ventilation cross bar 18 tend to be the same and causing the original ventilation gaps 100 to disappear; at the same time, under the drive of gravity, the heavier lower leaf 12.2 of the grille plate automatically swings downward around the axis of the grille plate rotating shaft 13, and the lighter upper leaf 12.1 of the grille plate automatically swings upward around the axis of the grille plate rotating shaft 13; making the lower surface of the lower leaf 12.2 of the grille plate tangent to a ventilation cross bar 18 with the same outer diameter at each part below, and the upper surface of the upper leaf 12.1 of the grille plate tangent to a ventilation cross bar 18 with the same outer diameter at each part above; thereby making the overall grille ventilation window 3 relatively closed and achieving the purpose of blocking the outside air from entering the electrical compartment 1.

[0037] A number of spray nozzles 11 facing the inside of the electrical compartment 1 are fixedly installed on the inner side of the cross beam of the window frame 7; the specific model of the spray nozzles 11 can have a certain atomization function.

[0038] As Figure 2, a longitudinal liquid guiding channel 9.1 is arranged inside the longitudinal beam of the window frame 7, and a transverse liquid guiding channel 9.2 is arranged inside the cross beam of the window frame 7. One side of the transverse liquid guiding channel 9.2 is communicated with the liquid inlet ends of the flame retardant liquid injectors 10 through a plurality of liquid inlet channels 9.3; the upper end of the longitudinal liquid guiding channel 9.1 is communicated with the transverse liquid guiding channel 9.2; a central tube 15 is coaxially arranged with the axis of each transverse cylinder 14, and the central tube 15 is communicated with and connected to each annular flame retardant liquid accumulator storage bin 21 through a plurality of vertically communicated connecting tubes 20. The ends of each central tube 15 are vertically communicated with the longitudinal liquid guiding channel 9.1.

[0039] Working principle: In the factory state, each annular flame retardant liquid accumulator storage bin 21 on each ventilation cross bar 18 is filled with a flame retardant liquid, such as carbon tetrachloride liquid, and the outer bulging elastic annular wall 16 bulges outwards under the liquid pressure in the annular flame retardant liquid accumulator storage bin 21; thus, a plurality of equidistantly distributed outer bulging elastic annular walls 16 are formed on the outer wall of the ventilation cross bar 18 along the length direction, and a ventilation gap 100 is formed between any two adjacent outer bulging elastic annular walls 16 on the ventilation cross bar 18; when the charging pile cabinet 2 is working normally, the exhaust fan at the bottom of the electrical compartment 1 operates normally, and the external relatively cold air enters the electrical compartment 1 through the ventilation gap 100 formed between any two adjacent outer bulging elastic annular walls 16 on each ventilation cross bar 18 under the action of negative pressure, so as to achieve a normal air cooling circulation effect;

[0040] When the temperature sensor of any aerosol fire extinguisher 6 in the electrical compartment 1 senses that overheating and fire have occurred in the electrical compartment 1, it immediately controls the electrical components and the exhaust fan in the electrical compartment 1 to cut off the power. At the same time, each aerosol fire extinguisher 6 automatically releases a large amount of flame retardant aerosol, aerosol-shaped FK-5-1-12, pearlescent alumina, etc. into the electrical compartment 1. Since the aerosol fire extinguishers 6 are distributed at multiple positions in the electrical compartment 1, the electrical compartment 1 will be quickly flooded by the aerosol flame retardant substances, so as to achieve the purpose of quickly extinguishing the fire in a short time; if after the end of this stage, the fire in the electrical compartment 1 has been extinguished and there is no reignition in a short time, in order to avoid environmental pollution caused by the release of carbon tetrachloride liquid in the grille ventilation window 3, the grille ventilation window 3 does not need to be changed into the fire extinguishing mode;

[0041] If the open fire in the electrical compartment 1 is quickly extinguished due to the isolation of oxygen by the aerogel mist group in a short time, but since the temperature of the combustibles in the electrical compartment 1 may still be within the combustible point range, after the aerosol in the electrical compartment 1 quickly dissipates through the grille ventilation window 3, there is a possibility of reignition in the electrical compartment 1;

[0042] Once reignition occurs in the electrical compartment 1, the grille ventilation window 3 is immediately changed into the fire extinguishing mode; the process of changing the grille ventilation window 3 into the fire extinguishing mode is as follows:

[0043] Control each flame retardant liquid injector 10 to quickly and evenly spray carbon tetrachloride liquid into the electrical compartment 1 through the nozzle 11. When the liquid carbon tetrachloride is sprayed onto the fire area, it will quickly evaporate. Since its vapor density is more than about 5 times that of air, it will gather densely around the fire source, forming a thick steam layer that surrounds the burning substance and plays a role in isolating air. This process of evaporating and diluting the oxygen concentration causes the flame to go out due to lack of oxygen. At the same time, carbon tetrachloride absorbs heat during the evaporation process, thereby reducing the temperature in the flame area and further accelerating the fire extinguishing process.

[0044] While each flame retardant liquid injector 10 gradually sprays carbon tetrachloride liquid through the nozzle 11, the carbon tetrachloride liquid in each annular flame retardant liquid pressure storage bin 21 will gradually pass through the connecting pipe 20, the central pipe 15, the longitudinal liquid guiding channel 9.1, the transverse liquid guiding channel 9.2 and the liquid inlet channel 9.3 in sequence and be supplied to each flame retardant liquid injector 10, so that the nozzle 11 can continuously spray carbon tetrachloride liquid into the electrical compartment 1 for a certain period of time. During the process that the carbon tetrachloride liquid in each annular flame retardant liquid pressure storage bin 21 is gradually discharged and consumed completely, the pressure in the annular flame retardant liquid pressure storage bin 21 gradually decreases until it drops to the normal atmospheric pressure. During the above process, each outwardly bulging elastic annular wall 16 automatically contracts under the action of its own elastic restoring force until the carbon tetrachloride liquid in each annular flame retardant liquid pressure storage bin 21 is completely discharged, and the outwardly bulging elastic annular wall 16 contracts into a cylindrical elastic ring wall 16a, making the outer diameters of all parts of the ventilation cross bar 18 tend to be the same and causing the original ventilation gaps 100 to disappear. At the same time, under the drive of gravity, the heavier lower leaf 12.2 of the grille plate automatically swings downward around the axis of the grille plate rotating shaft 13, and the lighter upper leaf 12.1 of the grille plate automatically swings upward around the axis of the grille plate rotating shaft 13; making the lower surface of the lower leaf 12.2 of the grille plate tangent to a ventilation cross bar 18 with the same outer diameter below, and the upper surface of the upper leaf 12.1 of the grille plate tangent to a ventilation cross bar 18 with the same outer diameter above; thereby making the grille ventilation window 3 relatively closed as a whole and achieving the purpose of blocking external air from entering the electrical compartment 1; thus playing a role in suppressing the escape of the vaporized carbon tetrachloride flame retardant steam in the electrical compartment 1 and further playing a role in suppressing re-ignition.

[0045] The above is only the preferred embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. An automatic fire extinguishing charging pile with a multi-point explosion-proof module, characterized in that: It includes a charging pile cabinet body (2). Inside the charging pile cabinet body (2) is an electrical compartment (1). At multiple points in the electrical compartment (1), aerosol fire extinguishers (6) with an automatic triggering function are respectively installed. The aerosol fire extinguishers (6) can release aerosol flame-retardant substances into the electrical compartment (1). On the side of the charging pile cabinet body (2) is a grille ventilation window (3). The grille ventilation window (3) includes two modes: normal state and fire extinguishing. The grille ventilation window (3) ventilates and connects the electrical compartment (1) with the outside in the normal state. After the grille ventilation window (3) enters the fire extinguishing mode, it can release cooling or flame-retardant substances into the electrical compartment (1) and cut off the ventilation state. A temperature sensing module is arranged in each aerosol fire extinguisher (6). The grille ventilation window (3) includes a window frame (7). Inside the window frame (7), a number of horizontal strip-shaped grille plates (12) are evenly arranged in an array from top to bottom at equal intervals. On each grille plate (12), a grille plate rotating shaft (13) is integrally arranged along the length extension direction. The two ends of the grille plate rotating shaft (13) are rotatably matched with the bearing holes on the inner side of the window frame (7) through bearings, so that each grille plate (12) can freely rotate around the axis of the corresponding grille plate rotating shaft (13). A ventilation cross bar (18) is clamped between any two adjacent grille plates (12). The two ends of the ventilation cross bar (18) are fixedly connected to the window frame (7). The ventilation cross bar (18) includes a cross cylinder (14). The two ends of the cross cylinder (14) are fixedly connected to the window frame (7). A number of sunken cylinder wall sections (14a) are evenly distributed along the axial direction of the cross cylinder (14). Outside each sunken cylinder wall section (14a), a circle of outwardly bulging outer bulging elastic annular walls (16) is arranged. A sealed annular flame-retardant liquid pressure storage bin (21) is formed between the outer bulging elastic annular wall (16) and the sunken cylinder wall section (14a). Each annular flame-retardant liquid pressure storage bin (21) is filled with flame-retardant liquid, so that the outer wall of the ventilation cross bar (18) forms a number of evenly distributed outer bulging elastic annular walls (16) along the length direction. A ventilation gap (100) is formed between any two adjacent outer bulging elastic annular walls (16) on the ventilation cross bar (18). The grille plate (12) is divided into a coplanar upper leaf (12.1) and a lower leaf (12.2) of the grille plate with the grille plate rotating shaft (13) as the boundary. The plate surface of the grille plate (12) is an inclined surface. The upper leaf (12.1) of the grille plate (12) is closer to the inner side of the electrical compartment (1) than the lower leaf (12.2) of the grille plate (12). When viewed from the axial perspective of the grille plate rotating shaft (13), the lower leaf (12.2) of the grille plate is wider than the upper leaf (12.1) of the grille plate, making the lower leaf (12.2) of the grille plate heavier than the upper leaf (12.1) of the grille plate. In the free state, the gravity of the lower leaf (12.2) of the grille plate overcomes the gravity of the upper leaf (12.1) of the grille plate, causing the lower leaf (12.2) of the grille plate to have a downward swing tendency around the axis of the grille plate rotating shaft (13), and the upper leaf (12.1) of the grille plate to have an upward swing tendency around the axis of the grille plate rotating shaft (13); thereby making the upper surface of the upper leaf (12.1) of the grille plate (12) tangent to the outer bulging elastic annular walls (16) on each ventilation cross bar (18) above; the lower surface of the lower leaf (12.2) of the grille plate (12) is tangent to the outer bulging elastic annular walls (16) on a ventilation cross bar (18) below.

2. The automatic fire extinguishing charging pile of the multi-point explosion-proof module according to claim 1, characterized in that: A exhaust fan is provided at the bottom of the electrical compartment (1).

3. The automatic fire extinguishing charging pile of the multi-point explosion-proof module according to claim 2, characterized in that: When the pressure in each annular flame retardant liquid accumulator storage compartment (21) drops to normal atmospheric pressure, each outer bulging elastic annular wall (16) in the outward bulging state automatically contracts under the action of its own elastic restoring force until the outer bulging elastic annular wall (16) contracts into a cylindrical elastic annular wall (16a), making the outer diameters of all parts of the ventilation cross bar (18) tend to be the same, and causing the original ventilation gaps (100) to disappear; at the same time, under the drive of gravity, the heavier lower leaf (12.2) of the grille plate automatically swings downward around the axis of the grille plate rotating shaft (13), and the lighter upper leaf (12.1) of the grille plate automatically swings upward around the axis of the grille plate rotating shaft (13); making the lower surface of the lower leaf (12.2) of the grille plate tangent to a ventilation cross bar (18) with the same outer diameter everywhere below, and the upper surface of the upper leaf (12.1) of the grille plate tangent to a ventilation cross bar (18) with the same outer diameter everywhere above; thereby making the overall grille ventilation window (3) relatively closed and achieving the purpose of blocking external air from entering the electrical compartment (1). A number of nozzles (11) are fixedly installed on the inner side of the cross beam of the window frame (7) facing the flame retardant liquid injector (10) inside the electrical compartment (1). A longitudinal liquid guiding channel (9.1) is arranged inside the longitudinal beam of the window frame (7), and a transverse liquid guiding channel (9.2) is arranged inside the cross beam of the window frame (7). One side of the transverse liquid guiding channel (9.2) is connected to the liquid inlet ends of each of the flame retardant liquid injectors (10) through a number of liquid inlet channels (9.3); the upper end of the longitudinal liquid guiding channel (9.1) is connected to the transverse liquid guiding channel (9.2). A central tube (15) is coaxially arranged at the center of each of the horizontal cylinders (14), and the central tube (15) is connected to each of the annular flame retardant liquid accumulator storage compartments (21) through a number of vertically connected connecting tubes (20). The ends of each central tube (15) are vertically connected to the longitudinal liquid guiding channel (9.1).

4. The fire extinguishing method of the automatic fire extinguishing type charging pile of the multi-point explosion-proof module according to claim 3, characterized in that: During a fire, the aerosol fire extinguisher (6) automatically releases a large amount of flame retardant aerosol into the electrical compartment (1) for fire extinguishing; if re - ignition occurs within a short time after the end of this stage, immediately control each flame retardant liquid injector (10) to quickly and evenly spray carbon tetrachloride liquid into the interior of the electrical compartment (1) through the nozzles (11).

Images