Alternating high and low pressure intermittent-release fire extinguishing device and method

Abstract

An alternating high and low pressure intermittent-release fire extinguishing device, comprising: a cylinder body (1), where an aerosol generating device (2) is mounted at one end of the cylinder body (1), a spray cover (5) is slidably mounted at the other end of the cylinder body (1), and a gas flow channel (7) is formed in the cylinder body (1) between the aerosol generating device (2) and the spray cover (5); a fan (3) is rotatably mounted in the gas flow channel (7), one end of a transmission rod (4) eccentrically articulates with an end face of the fan (3), and the other end of the transmission rod (4) is hinged to the spray cover (5); a conventional nozzle (51) and a pulsating nozzle (52) are arranged on the spray cover (5), the conventional nozzle (51) is located outside the cylinder body (1), and the pulsating nozzle (52) intermittently extends out of the cylinder body (1) when driven by the fan (3); and a flow guide structure (8) is arranged in the gas flow channel (7) at the side of the fan (3) close to the aerosol generating device (2). The conventional nozzle (51) and the pulsating nozzle (52) form low pressure and high pressure reciprocating circulation format to release a fire extinguishing gas; when at low pressure, the device can stifle flames and cause inflammable gas within a battery to be discharged; and when at high pressure, the inflammable gas can be pushed out of the a battery compartment, thus effectively suppressing and extinguishing a fire caused by thermal runaway of a new energy battery. Further disclosed is a fire extinguishing method utilizing the alternating high and low pressure intermittent-release fire extinguishing device.

Description

A high-low pressure reciprocating intermittent release fire extinguishing device and method Technical Field

[0001] The present invention relates to the technical field of fire extinguishers, and in particular to a high-low pressure reciprocating intermittent release fire extinguishing device and method. Background Art

[0002] When new energy batteries experience thermal runaway, they often continue to produce flammable gases. Traditional aerosol fire extinguishing devices are difficult to extinguish flames. Pulse fire extinguishing devices can extinguish flames but cannot achieve continuous suppression. The pulse device is combined with the traditional aerosol fire extinguishing device to extinguish the flames at the moment of battery thermal runaway, and the traditional fire extinguishing device can still suppress the flames to a certain extent after the pulse device is sprayed. However, due to the large gas production of the traditional aerosol fire extinguishing device, the aerosol fire extinguishing agent will quickly fill the entire protected space. In this process, only part of the flammable gas is pushed out of the battery compartment. More flammable gas is often suppressed inside the battery and cannot be discharged due to the excessive positive pressure in the battery compartment when the aerosol fire extinguishing device is sprayed. After the fire extinguishing device is sprayed, the flammable gas will squeeze out the aerosol fire extinguishing agent, and there is a possibility of re-ignition. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: to solve the problems existing in the above-mentioned background technology, and to provide a high-low pressure reciprocating intermittent release fire extinguishing device and method, which releases fire extinguishing gas in the form of low-pressure and high-pressure reciprocating cycle. When the pressure is low, it can suppress the flame and allow the combustible gas in the battery to be discharged. When the pressure is high, it can push the combustible gas out of the battery compartment.

[0004] In order to achieve the above-mentioned technical features, the purpose of the present invention is achieved as follows: a high-low pressure reciprocating intermittent release fire extinguishing device, comprising a cylinder, an aerosol generating device is installed at one end of the cylinder, and a spray cover is slidably installed inside the other end, an air flow channel is formed in the cylinder between the aerosol generating device and the spray cover, a wind wheel is rotatably installed in the air flow channel, one end of the transmission rod is eccentrically hinged to the end face of the wind wheel, and the other end is hinged to the spray cover, and a conventional nozzle and a pulse nozzle are provided on the spray cover, the conventional nozzle is located outside the cylinder, and the pulse nozzle is intermittently extended out of the cylinder under the drive of the wind wheel; a guide structure is provided in the air flow channel on the side of the wind wheel close to the aerosol generating device.

[0005] The aerosol generating device comprises a cover body and an aerosol generating agent. The aerosol generating agent is installed in the cover body, and a start line on the aerosol generating agent passes through the cover body. The cover body is installed at one end of the cylinder body.

[0006] The wind wheel includes two side plates and a plurality of wind blades connected between the two side plates. A connecting column away from the rotation center of the side plate is provided on the side of the side plate away from the wind blades. The transmission rod is connected to one end of the wind wheel hinged by the connecting column.

[0007] The cylinder is provided with limit plates on both sides of the position where the wind wheel is installed, and an avoidance space is provided between the limit plates and the inner wall of the cylinder. Through holes are provided on the limit plates on both sides, and the two ends of the wind wheel are respectively connected to the through holes on both sides for rotation and limiting, and the transmission rod extends into the avoidance space and is hinged to the end face of the wind wheel.

[0008] The through holes on both sides are respectively provided with outward ring platforms on opposite sides, and the two ends of the wind wheel are respectively connected to the ring platforms on both sides for rotation and limiting.

[0009] The wind wheel is rotatably mounted on a bracket, and the bracket is mounted in the cylinder.

[0010] The bracket includes a shell that passes through from top to bottom, and a through hole is provided on the upper side of the shell. The wind wheel is installed in the shell, and the two ends of the wind wheel are rotatably connected to the through holes on both sides. The shell is provided with an avoidance groove on the outer wall located at the two end faces of the wind wheel, and the transmission rod extends into the avoidance groove and is hinged to the end face of the wind wheel.

[0011] A flow guide structure is provided in the shell on the side of the wind wheel close to the aerosol generating device.

[0012] The guide structure is composed of a baffle or block arranged on one side of the air flow channel. One end of the guide structure is close to the inner wall of the air flow channel, and the other end extends to the middle of the wind wheel. The guide structure guides the airflow in the air flow channel to one side of the wind wheel.

[0013] The method of using the high-low pressure reciprocating intermittent release fire extinguishing device for high-low pressure reciprocating cycle release fire extinguishing includes the following steps:

[0014] S1. The aerosol generating device is activated to generate fire extinguishing gas;

[0015] S2. The fire-extinguishing gas flows through the airflow channel to one end of the spray cover and is ejected from the conventional nozzle of the spray cover; during the flow of the fire-extinguishing gas, the gas passes through the guide structure to drive the wind wheel to rotate;

[0016] S3. The wind wheel rotates, and under the transmission of the transmission rod, drives the spray cover to extend and retract;

[0017] S4. When the nozzle cover is extended and the pulse nozzle is exposed, fire extinguishing gas is ejected simultaneously through the conventional nozzle and the pulse nozzle;

[0018] S5. As the wind wheel continues to rotate, the wind wheel drives the nozzle cover to retract under the transmission rod, and the pulse nozzle retracts into the cylinder. At this time, the conventional nozzle sprays fire extinguishing gas, while the pulse nozzle is closed;

[0019] S6. Continue S3-S5, with the pulse nozzle intermittently extending from the cylinder until the aerosol generating device is completely consumed.

[0020] The present invention has the following beneficial effects:

[0021] 1. The present invention has an aerosol generator at one end of the airflow channel and a spray cap at the other end. A wind wheel is installed in the airflow channel. After the aerosol generator is activated, the fire-extinguishing gas drives the wind wheel in the airflow channel to rotate. Because the transmission rod is eccentrically hinged to the end face of the wind wheel, the wind wheel rotates, thereby driving the spray cap to extend and retract through the transmission rod. The fire-extinguishing gas is released through the conventional nozzle and the pulse nozzle in a low-pressure and high-pressure reciprocating cycle. At low pressure, it can suppress flames and allow combustible gases in the battery to be discharged. At high pressure, it can push the combustible gases out of the battery compartment. This can effectively suppress and extinguish fires caused by thermal runaway of new energy batteries.

[0022] 2. The advantage of setting up conventional nozzles and pulse nozzles in the present invention is that the conventional nozzles are always located outside the barrel. The setting of the conventional nozzles can prevent the spray cover from being difficult to retract during the retraction process due to excessive spraying pressure, while the pulse nozzles intermittently extend out of the barrel, achieving the effect of changing the spraying intensity due to changes in the number of nozzles.

[0023] 3. The intermittent spraying of the present invention does not require one set of fire extinguishing devices to finish spraying before another set of fire extinguishing devices is activated. This is because the time interval between the spraying of the two sets of fire extinguishing devices can still pose a risk. The conventional nozzles of the present invention are always located outside the cylinder to spray fire extinguishing gas. When the pulse nozzles extend out of the cylinder, multiple nozzles release a large amount of fire extinguishing gas simultaneously, thus achieving an intermittent yet uninterrupted fire extinguishing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG1 is a schematic diagram of the cross-sectional structure of the present invention.

[0025] FIG2 is a schematic diagram of the connection structure between the wind wheel and the spray cover of the present invention.

[0026] FIG3 is a schematic diagram of the AA cross-sectional structure of the first embodiment of the wind wheel installation of the present invention in FIG1 .

[0027] FIG4 is a schematic structural diagram of a second embodiment of a wind wheel installation according to the present invention.

[0028] FIG5 is a side structural schematic diagram of FIG4 .

[0029] FIG6 is a schematic diagram of the top structure of FIG5 .

[0030] FIG7 is a schematic diagram of the BB cross-sectional structure in FIG4 .

[0031] FIG8 is a schematic diagram of the three-dimensional structure of the connection between the wind wheel and the spray cover of the present invention.

[0032] FIG9 is a diagram showing the present invention in use, where only the conventional nozzle of the spray cap is exposed from the barrel.

[0033] FIG10 is a diagram showing the present invention in use, where the spray cover is driven upward by the wind wheel.

[0034] FIG11 is a diagram of the present invention in use, where both the conventional nozzle and the pulse nozzle of the spray cap are exposed from the barrel.

[0035] FIG12 is a diagram showing the present invention in use, where the pulse nozzle of the spray cover is retracted into the barrel.

[0036] In the figure: cylinder 1, limit plate 11, through hole 12, ring platform 13, avoidance space 14, aerosol generating device 2, cover 21, aerosol generating agent 22, starting line 23, wind wheel 3, side plate 31, fan blade 32, connecting column 33, transmission rod 4, spray cover 5, conventional nozzle 51, pulse nozzle 52, support rod 53, bracket 6, shell 61, through hole 62, avoidance groove 63, air flow channel 7, guide structure 8. Implementation Method

[0037] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0038] Example 1:

[0039] Referring to Figure 1-12, a high-low pressure reciprocating intermittent release fire extinguishing device includes a cylinder 1, an aerosol generating device 2 is installed at one end of the cylinder 1, and a spray cover 5 is slidably installed inside the other end. An air flow channel 7 is formed in the cylinder 1 between the aerosol generating device 2 and the spray cover 5, and a wind wheel 3 is rotatably installed in the air flow channel 7. One end of the transmission rod 4 is eccentrically hinged to the end face of the wind wheel 3, and the other end is hinged to the spray cover 5. The spray cover 5 is provided with a conventional nozzle 51 and a pulse nozzle 52. The conventional nozzle 51 is located outside the cylinder 1, and the pulse nozzle 52 is intermittently extended out of the cylinder 1 under the drive of the wind wheel 3; a guide structure 8 is provided in the air flow channel 7 on the side of the wind wheel 3 close to the aerosol generating device 2. An aerosol generator 2 is provided at one end of the airflow channel 7, and a spray cap 5 is installed at the other end. A wind wheel 3 is installed in the airflow channel 7. After the aerosol generator 2 is activated, the fire extinguishing gas drives the wind wheel 3 in the airflow channel 7 to rotate. Since the transmission rod 4 is eccentrically hinged to the end face of the wind wheel 3, the wind wheel 3 rotates, thereby driving the spray cap 5 to move telescopically through the transmission rod 4. The fire extinguishing gas is released in the form of a low-pressure and high-pressure reciprocating cycle through the conventional nozzle 51 and the pulse nozzle 52. At low pressure, it can suppress flames and allow the combustible gas in the battery to be discharged. At high pressure, it can push the combustible gas out of the battery compartment. This can effectively suppress and extinguish fires caused by thermal runaway of new energy batteries.

[0040] In a preferred embodiment, referring to FIG1 , an aerosol generating device 2 includes a cover 21 and an aerosol generating agent 22. The aerosol generating agent 22 is mounted within the cover 21, and a trigger wire 23 on the aerosol generating agent 22 extends through the cover 21. The cover 21 is mounted at one end of the barrel 1. Specifically, the trigger wire 23 can be a thermal wire or a wire from an electronic triggering device.

[0041] The aerosol generator is a prior art, for example, the invention patent disclosed in Chinese Patent Publication No. CN101745195B is "An aging-resistant aerosol generator and its preparation process", which discloses that the aerosol generator is composed of an oxidant, a reducing agent, and a binder. The oxidant is potassium nitrate, the binder is phenolic resin, and the reducing agent is melamine. The mass percentages thereof are: potassium nitrate 74% to 80%, phenolic resin 8% to 15%, and the balance is melamine.

[0042] Its preparation method is:

[0043] Step 1: dissolving phenolic resin in ethanol to prepare a phenolic resin solution with a mass concentration of 40% to 55%;

[0044] Step 2: Grind the oxidizing agent and reducing agent to a fineness of 80-200 standard mesh, mix them according to the required proportion, and sieve them through 80-200 mesh three times to make them evenly mixed;

[0045] Step 3: Then add the phenolic resin solution to the mixed powder, stir for 10 minutes, and use a 40-mesh screen to force granulate. Then dry the agent in an environment with a temperature of 40°C and a relative humidity below 20% until the volatile component is less than 1%.

[0046] Referring to Figure 8 , the wind rotor 3 specifically includes two side panels 31 and a plurality of blades 32 connected between the two side panels 31. A connecting post 33, located away from the rotation center of the side panels 31, is provided on the side of the side panels 31 away from the blades 32. The hinged end of the transmission rod 4 is connected to the wind rotor 3 via the connecting post 33. This structure enables the fire extinguishing gas to drive the wind rotor 3 to rotate.

[0047] Referring to Figure 3, a first embodiment of the installation of the wind rotor 3 is shown. In this embodiment, a limiting plate 11 is provided on each side of the cylinder 1 where the wind rotor 3 is installed. A clearance space 14 is provided between the limiting plate 11 and the inner wall of the cylinder 1. Through holes 12 are provided on each of the limiting plates 11. The ends of the wind rotor 3 are connected to the through holes 12 for rotational restraint. The transmission rod 4 extends into the clearance space 14 and is hingedly connected to the end face of the wind rotor 3. Through this structure, the wind rotor 3 is supported and rotated by the through holes 12. Of course, to ensure the flexibility of the wind rotor 3's rotation, the wind rotor 3 can be installed and connected to the through holes 12 using a thin-walled bearing.

[0048] Furthermore, the through holes 12 on both sides are provided with outward annular platforms 13 on opposite sides, and the two ends of the wind wheel 3 are respectively connected to the annular platforms 13 on both sides for rotation and limiting. The wind wheel 3 is limited by the annular platforms 13, and the structure is more stable.

[0049] It should be noted that the function of the escape space 14 is to provide space for the transmission rod 4 to operate. In order to prevent the fire extinguishing gas from passing through the escape space 14, the lower end of the escape space 14 can be closed.

[0050] In the second embodiment of the installation of the wind wheel 3 , referring to FIGS. 4-7 , the wind wheel 3 is rotatably installed on a bracket 6 , and the bracket 6 is installed in the cylinder 1 .

[0051] Specifically, the bracket 6 comprises a housing 61 extending vertically through the housing 61. A through-hole 62 is defined on the upper side of the housing 61. The rotor 3 is mounted within the housing 61, with both ends of the rotor 3 pivotally connected to the through-holes 62. The housing 61 has escape grooves 63 on its outer wall, located at the ends of the rotor 3. The transmission rod 4 extends into the escape grooves 63 and is hingedly connected to the end faces of the rotor 3. The through-hole 62 is used to pivotally mount the rotor 3, while the escape groove 63 provides clearance for the transmission rod 4 to operate. This structure allows the rotor 3 to be mounted within the cylindrical body 1 via the bracket 6.

[0052] Furthermore, in order to enhance the driving effect of the wind wheel 3 , a flow guide structure 8 is provided in the housing 61 on the side of the wind wheel 3 close to the aerosol generating device 2 .

[0053] Specifically, referring to FIG7 , the guide structure 8 is composed of a baffle or block provided on one side of the airflow channel 7. One end of the guide structure 8 is close to the inner wall of the airflow channel 7, and the other end extends to the middle of the wind wheel 3. The guide structure 8 guides the airflow in the airflow channel 7 to one side of the wind wheel 3. This structure enables the wind wheel 3 to rotate more stably.

[0054] Referring to Figure 8 , the cross-section of the spray cap 5 can be either rectangular or circular, depending on the shape of the airflow channel 7. The spray cap 5 is in the form of a cover with one end open, located within the barrel 1, while the conventional nozzle 51 remains outside the barrel 1. In a preferred embodiment, a support rod 53 is fixed to the open end of the spray cap 5, which is hingedly connected to the transmission rod 4.

[0055] Example 2:

[0056] The method of using the high-low pressure reciprocating intermittent release fire extinguishing device for high-low pressure reciprocating cycle release fire extinguishing includes the following steps:

[0057] S1. Referring to FIG9 , the aerosol generating device 2 is started and generates fire extinguishing gas.

[0058] S2. The fire extinguishing gas flows through the air flow channel 7 to one end of the spray cover 5 and is ejected from the conventional nozzle 51 of the spray cover 5. During the flow of the fire extinguishing gas, the flow guide structure drives the wind wheel 3 to rotate.

[0059] S3. Referring to FIG10 , the wind wheel 3 rotates, and under the transmission of the transmission rod 4, the spray cover 5 is driven to telescopic movement.

[0060] S4. Referring to FIG. 11 , when the spray cover 5 is extended and the pulse nozzle 52 is exposed, the fire extinguishing gas is ejected simultaneously through the conventional nozzle 51 and the pulse nozzle 52 to release high-pressure gas.

[0061] S5. Referring to FIG. 12 , as the wind wheel 3 continues to rotate, the wind wheel 3 drives the spray cover 5 to retract under the transmission of the transmission rod 4 , and the pulse nozzle 52 retracts into the cylinder 1 . At this time, the conventional nozzle 51 sprays fire extinguishing gas, while the pulse nozzle 52 is closed.

[0062] S6. Continuing S3-S5, the pulse nozzle 52 intermittently extends from the cylinder 1 until the aerosol generating device 2 is completely consumed.

[0063] Through the above method, the fire extinguishing gas is released in the form of reciprocating low pressure and high pressure, so as to achieve the effect of extinguishing the fire of new energy batteries.

Claims

1. A high-low pressure reciprocating intermittent release fire extinguishing device, comprising a cylinder (1), characterized in that: An aerosol generating device (2) is mounted on one end of the cylinder (1), and a spray cover (5) is slidably mounted on the other end thereof. An airflow channel (7) is formed in the cylinder (1) between the aerosol generating device (2) and the spray cover (5). A wind wheel (3) is rotatably mounted in the airflow channel (7). One end of a transmission rod (4) is eccentrically hinged to the end face of the wind wheel (3), and the other end is hinged to the spray cover (5). The spray cover (5) is provided with a conventional nozzle (51) and a pulse nozzle (52). The conventional nozzle (51) is located outside the cylinder (1), and the pulse nozzle (52) is intermittently extended from the cylinder (1) under the drive of the wind wheel (3). A flow guide structure (8) is provided in the airflow channel (7) on the side of the wind wheel (3) close to the aerosol generating device (2).

2. A high-low pressure reciprocating intermittent release fire extinguishing device according to claim 1, characterized in that: The aerosol generating device (2) comprises a cover body (21) and an aerosol generating agent (22); the aerosol generating agent (22) is installed in the cover body (21), and a start line (23) on the aerosol generating agent (22) passes through the cover body (21); the cover body (21) is installed at one end of the cylinder (1).

3. A high-low pressure reciprocating intermittent release fire extinguishing device according to claim 1, characterized in that: The wind wheel (3) comprises two side plates (31) and a plurality of wind blades (32) connected between the two side plates (31); a connecting column (33) away from the rotation center of the side plate (31) is provided on the side of the side plate (31) away from the wind blades (32); and one end of the transmission rod (4) hinged to the wind wheel (3) is connected via the connecting column (33).

4. A high-low pressure reciprocating intermittent release fire extinguishing device according to claim 1 or 3, characterized in that: The cylinder (1) is provided with limit plates (11) on both sides of the position where the wind wheel (3) is installed, and an escape space (14) is provided between the limit plates (11) and the inner wall of the cylinder (1). Through holes (12) are provided on the limit plates (11) on both sides, and the two ends of the wind wheel (3) are respectively connected to the through holes (12) on both sides for rotation and limiting, and the transmission rod (4) extends into the escape space (14) and is hinged to the end face of the wind wheel (3).

5. A high-low pressure reciprocating intermittent release fire extinguishing device according to claim 4, characterized in that: The through holes (12) on both sides are respectively provided with outwardly facing ring platforms (13) on opposite sides, and the two ends of the wind wheel (3) are respectively connected to the ring platforms (13) on both sides in a rotationally limited manner.

6. A high-low pressure reciprocating intermittent release fire extinguishing device according to claim 1 or 3, characterized in that: The wind wheel (3) is rotatably mounted on a bracket (6), and the bracket (6) is mounted inside the cylinder (1).

7. A high-low pressure reciprocating intermittent release fire extinguishing device according to claim 6, characterized in that: The bracket (6) comprises a shell (61) that penetrates from top to bottom, a through hole (62) being provided on the upper side of the shell (61), the wind wheel (3) being installed in the shell (61), the two ends of the wind wheel (3) being rotatably connected to the through holes (62) on both sides respectively, the shell (61) being provided with avoidance grooves (63) on the outer wall located at the two end faces of the wind wheel (3), the transmission rod (4) extending into the avoidance grooves (63) and being hingedly connected to the end faces of the wind wheel (3).

8. A high-low pressure reciprocating intermittent release fire extinguishing device according to claim 7, characterized in that: A flow guide structure (8) is provided in the housing (61) on the side of the wind wheel (3) close to the aerosol generating device (2).

9. The high-low pressure reciprocating intermittent release fire extinguishing device according to claim 1, characterized in that: The flow guide structure (8) is composed of a baffle or a block arranged on one side of the airflow channel (7); one end of the flow guide structure (8) is close to the inner wall of the airflow channel (7) and the other end extends to the middle of the wind wheel (3); the flow guide structure (8) guides the airflow in the airflow channel (7) to one side of the wind wheel (3).

10. A method of using a high-low pressure reciprocating intermittent release fire extinguishing device as claimed in any one of claims 1 to 9 for high-low pressure reciprocating cycle release fire extinguishing, characterized in that: The following steps are involved: S1. The aerosol generating device (2) is started, and the aerosol generating device (2) generates fire extinguishing gas; S2. The fire extinguishing gas flows through the air flow channel (7) toward one end of the spray cover (5), and the fire extinguishing gas is sprayed out from the conventional nozzle (51) of the spray cover (5); During the flow of the fire extinguishing gas, the gas passes through the flow guiding structure to drive the wind wheel (3) to rotate; S3. The wind wheel (3) rotates, and under the transmission of the transmission rod (4), drives the spray cover (5) to move telescopically; S4. When the spray cover (5) is extended and the pulse nozzle (52) is exposed, the fire extinguishing gas is ejected simultaneously through the conventional nozzle (51) and the pulse nozzle (52); S5. As the wind wheel (3) continues to rotate, the wind wheel (3) drives the spray cover (5) to retract under the drive of the drive rod (4), and the pulse nozzle (52) retracts into the cylinder (1). At this time, the conventional nozzle (51) sprays fire extinguishing gas, while the pulse nozzle (52) is closed; S6. Continue S3-S5, with the pulse nozzle (52) intermittently extending out of the cylinder (1) until the aerosol generating device (2) is completely consumed.

Images