Pressure differential activated injection valve and fire suppression system

Abstract

The application discloses a differential pressure starting type injection valve and a fire extinguishing system. The differential pressure starting type injection valve comprises a shell, a first piston piece and a second piston piece. The shell defines a first piston cavity, a second piston cavity and a communication cavity. The communication cavity is located between the first piston cavity and the second piston cavity and is used for being connected with an external closed pipeline. The first piston cavity is provided with a first air inlet and a first air outlet. The second piston cavity is provided with a second air inlet and a second air outlet. The first air outlet is connected with an external air source. The second air inlet is connected with the first air outlet through an external valve group. The first piston piece is arranged in the first piston cavity. The second piston piece is arranged in the second piston cavity. The differential pressure starting type injection valve is used as a control valve group between a fire detecting pipe, an external air source and a fire extinguishing tank of the fire extinguishing system. The fire extinguishing system can ensure that the injection pressure is relatively uniform during the fire extinguishing process. The reliability of the differential pressure starting type injection valve is good, and the service life is long.

Description

Technical Field

[0001] This invention relates to the field of fire extinguishing device technology, and in particular to a differential pressure activated jet valve and fire extinguishing system. Background Technology

[0002] Lithium-ion batteries are widely used in energy storage, electric vehicles, and communications industries. With repeated use and charging / discharging of the battery cells within the battery pack, due to differences in electrical performance, the cells with more severe degradation may experience overcharging or over-discharging during the charging / discharging process. This can lead to thermal runaway, causing a fire in the entire battery pack, thus endangering production safety and lives. Therefore, more and more battery packs are equipped with fire extinguishing devices during production and design to make lithium-ion battery packs safer and more reliable. Most industry solutions use electromagnetic valves activated by electrical signals to achieve automatic spraying of the fire extinguishing system. The spray pressure gradually decreases over time. Electromagnetic valves have relatively poor reliability and are prone to leakage after prolonged use, leading to the leakage of the extinguishing agent. Summary of the Invention

[0003] The first objective of this invention is to provide a differential pressure-activated jet valve. Using this differential pressure-activated jet valve as the control valve group between the fire detection tube, external air source and fire extinguishing tank in a fire extinguishing system can ensure that the jet pressure of the fire extinguishing system is relatively uniform during the fire extinguishing process. In addition, the differential pressure-activated jet valve has good reliability and a long service life.

[0004] The second objective of this invention is to provide a fire extinguishing system that exhibits relatively uniform spray pressure, high reliability, and long service life during the fire extinguishing process.

[0005] This invention discloses a differential pressure-activated injection valve, comprising: a housing defining a first piston chamber, a second piston chamber, and a connecting chamber; the connecting chamber being located between the first piston chamber and the second piston chamber and for connection to an external closed pipe; the first piston chamber having a first air inlet and a first air outlet; the second piston chamber having a second air inlet and a second air outlet; the first air outlet being connected to an external air source; and the second air inlet being connected to the first air outlet via an external valve assembly; and a first piston member disposed within the first piston chamber and for opening or blocking the first air inlet and the first air outlet. The passage between the air inlets; a second piston, disposed within the second piston chamber, and used to open or block the passage between the second air inlet and the second air outlet; wherein: when the external sealed pipe is damaged, external gas enters the first piston chamber from the first air inlet to drive the first piston to open the passage between the first air inlet and the first air outlet, and the external gas enters the second piston chamber from the second air inlet through the external valve group to drive the second piston to open the passage between the second air inlet and the second air outlet, so that the external gas is discharged from the second air outlet.

[0006] In some embodiments, the first piston has a first large end and a first small end, the first large end being disposed toward the communicating cavity, and the first small end being used to open or block the passage between the first air inlet and the first air outlet; the second piston has a second large end and a second small end, the second large end being disposed toward the communicating cavity, and the second small end being used to open or block the passage between the second air inlet and the second air outlet.

[0007] In some specific embodiments, the first piston chamber includes a first mating chamber, a first air inlet chamber, and a first air outlet chamber. The first mating chamber mates with the first piston member and communicates with the first air inlet chamber and the first air outlet chamber. The first air inlet chamber has a first straight section and a first gradually expanding section. The end of the first straight section away from the first gradually expanding section forms a first air inlet. The size of the first gradually expanding section gradually increases in the direction away from the first straight section. A first sealing groove is provided on the first small end. A first sealing element is fitted in the first sealing groove, and the first sealing element can abut against the side wall of the first gradually expanding section.

[0008] In some specific embodiments, a second sealing groove is provided on the first small end, a second sealing element is provided in the second sealing groove, and the outer peripheral wall of the second sealing element abuts against the inner side wall of the first mating cavity; and / or: a third sealing groove is provided on the first large end, a third sealing element is provided in the third sealing groove, and the outer peripheral wall of the third sealing element abuts against the inner side wall of the first mating cavity.

[0009] In some specific embodiments, the second piston chamber includes a second mating chamber, a second air inlet chamber, and a second air outlet chamber. The second mating chamber mates with the second piston member and communicates with the second air inlet chamber and the second air outlet chamber. The second air inlet chamber has a second straight section and a second gradually expanding section. The end of the second straight section away from the second gradually expanding section forms a second air inlet. The size of the second gradually expanding section gradually increases in the direction close to the second straight section. A fourth sealing groove is provided on the second small end. A fourth sealing element is fitted in the fourth sealing groove, and the fourth sealing element can abut against the side wall of the second gradually expanding section.

[0010] In some more specific embodiments, a fifth sealing groove is provided on the second small end, a fifth sealing element is provided in the fifth sealing groove, and the outer peripheral wall of the fifth sealing element abuts against the inner side wall of the second mating cavity; and / or: a sixth sealing groove is provided on the second large end, a sixth sealing element is provided in the sixth sealing groove, and the outer peripheral wall of the sixth sealing element abuts against the inner side wall of the second mating cavity.

[0011] In some embodiments, the housing includes a first housing portion, a second housing portion, and a third housing portion. One end of the second housing portion is connected to the first housing portion to define the first piston chamber. The first housing portion is provided with the first air inlet and the first air outlet. One end of the second housing portion is connected to the third housing portion to define the second piston chamber. The third housing portion is provided with the second air inlet and the second air outlet.

[0012] This invention also discloses a fire extinguishing system, comprising: a fire extinguishing container for loading a fire extinguishing agent; a gas cylinder for loading a protective gas; a pressure reducing valve having a pressure reducing inlet and a pressure reducing outlet; a differential pressure-activated injection valve as described above, wherein a first air inlet is connected to the gas cylinder, a first air outlet is connected to the pressure reducing inlet, a second air inlet is connected to the pressure reducing outlet, a second air outlet is connected to the fire extinguishing container, and the connecting cavity is connected to a fire detection tube.

[0013] In some embodiments, the fire extinguishing system further includes a fire extinguishing pipe, one end of which is closed and the other end is connected to the fire extinguishing tank, and the fire extinguishing pipe is provided with a plurality of fire extinguishing nozzles.

[0014] In some embodiments, the fire extinguisher is a piston-type fire extinguisher, and the fire extinguisher is provided with a piston plate inside. The piston plate divides the internal space of the fire extinguisher into a fire extinguishing chamber and a driving chamber. The driving chamber is connected to the second air outlet, and the fire extinguishing chamber is provided with a fire extinguishing outlet.

[0015] The beneficial effects of the differential pressure-activated spray valve of the present invention are as follows: the first and second piston components can achieve double sealing, which solves the problem that even with slight leakage during long-term operation, the extinguishing agent in the fire extinguishing tank will not be driven to spray out, thereby improving the reliability of the differential pressure-activated spray valve. Furthermore, the double-sealed structure can extend the service life of the differential pressure-activated spray valve. During operation, when the external sealed pipeline is damaged, the connecting cavity is connected to the external environment. External gas enters the first piston chamber from the first inlet to drive the first piston component to open the channel between the first inlet and the first outlet. External gas enters the second piston chamber from the second inlet through the external valve group to drive the second piston component to open the channel between the second inlet and the second outlet, so that the external gas can be discharged from the second outlet. This ensures that the airflow pressure discharged from the second outlet is always relatively uniform, thereby ensuring that the spray pressure of the fire extinguishing system is relatively uniform during the fire extinguishing process.

[0016] The beneficial effects of the fire extinguishing system of the present invention are as follows: due to the differential pressure start-up type spray valve described above, the fire extinguishing system has a more uniform spray pressure during the fire extinguishing process, and has good reliability and long service life.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the differential pressure start-up type injection valve according to an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the fire extinguishing system according to an embodiment of the present invention.

[0020] Figure label:

[0021] 1. Shell; 11. First shell section; 111. First air inlet; 112. First air outlet; 12. Second shell section; 13. Third shell section; 131. Second air inlet; 132. Second air outlet; 101. First piston chamber; 1011. First mating chamber; 1012. First air inlet chamber; 10121. First straight section; 10122. First gradually expanding section; 1013. First air outlet chamber; 102. Second piston chamber; 1021. Second mating chamber; 1022. Second air inlet chamber; 10221. Second straight section; 10222. Second gradually expanding section; 1023. Second air outlet chamber; 103. Connecting chamber;

[0022] 2. First piston component; 21. First small end; 211. First sealing groove; 212. Second sealing groove; 22. First large end; 221. Third sealing groove;

[0023] 3. Second piston component; 31. Second small end; 311. Fourth sealing groove; 312. Fifth sealing groove; 32. Second large end; 321. Sixth sealing groove;

[0024] 4. First seal; 5. Second seal; 6. Third seal; 7. Fourth seal; 8. Fifth seal; 9. Sixth seal;

[0025] 100. Fire extinguishing canister; 110. Piston plate; 120. Drive chamber; 130. Extinguishing chamber; 200. Gas cylinder; 300. Pressure reducing valve; 400. Fire detection tube; 500. Extinguishing pipe. Detailed Implementation

[0026] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0027] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0028] Furthermore, features specified as "first" or "second" may explicitly or implicitly include one or more of those features, used to distinguish and describe features, without any order or emphasis. In the description of this invention, unless otherwise stated, "multiple" means two or more.

[0029] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] The following is for reference. Figures 1-2 The specific structure of the differential pressure start-up type injection valve according to an embodiment of the present invention is described.

[0031] This invention discloses a differential pressure-activated injection valve, such as... Figure 1 As shown, the differential pressure-activated injection valve of this embodiment includes a housing 1, a first piston 2, and a second piston 3. The housing 1 defines a first piston chamber 101, a second piston chamber 102, and a connecting chamber 103. The connecting chamber 103 is located between the first piston chamber 101 and the second piston chamber 102 and is used to connect to an external closed pipe. The first piston chamber 101 has a first air inlet 111 and a first air outlet 112. The second piston chamber 102 has a second air inlet 131 and a second air outlet 132. The first air outlet 112 is connected to an external air source. The second air inlet 131 is connected to the first air outlet 112 through an external valve group. The first piston 2 is disposed in the first piston chamber 101 and is used to open or block the passage between the first air inlet 111 and the first air outlet 112. The second piston 3 is disposed in the second piston chamber 102 and is used to open or block the passage between the second air inlet 131 and the second air outlet 132. When the external sealed pipeline is damaged, external gas enters the first piston chamber 101 from the first inlet 111 to drive the first piston 2 to open the channel between the first inlet 111 and the first outlet 112. External gas enters the second piston chamber 102 from the second inlet 131 through the external valve group to drive the second piston 3 to open the channel between the second inlet 131 and the second outlet 132, so that external gas is discharged from the second outlet 132.

[0032] Understandably, in actual operation, when the external sealed pipe is intact, the connecting cavity 103 is isolated from the external environment. At this time, even if gas enters the first piston chamber 101 from the first inlet 111, it cannot push the first piston 2 to move, and even if gas enters the second piston chamber 102 from the second inlet 131, it cannot push the second piston 3 to move. However, when the external sealed pipe is damaged, the connecting cavity 103 is connected to the external environment. External gas enters the first piston chamber 101 from the first inlet 111 to drive the first piston 2 to open the channel between the first inlet 111 and the first outlet 112. External gas also enters the second piston chamber 102 from the second inlet 131 through the external valve assembly to drive the second piston 3 to open the channel between the second inlet 131 and the second outlet 132, allowing external gas to be discharged from the second outlet 132. Therefore, when the differential pressure-activated jet valve of this embodiment is used as a control valve group between the fire detection pipe 400, the external air source, and the fire extinguishing tank 100 in the fire extinguishing system, specifically, the fire detection pipe 400 is connected to the connecting cavity 103 as an external closed pipe, the external air source is connected to the first air inlet 111, and the second air outlet 132 is connected to the fire extinguishing tank 100. In this way, double sealing is achieved through the first piston 2 and the second piston 3, which solves the problem that even if there is a slight leakage during long-term operation, the fire extinguishing agent in the fire extinguishing tank 100 will not be driven to spray out, thereby improving the reliability of the differential pressure-activated jet valve. Furthermore, the double sealing structure can extend the service life of the differential pressure-activated jet valve.

[0033] It should be further explained that when the fire detection tube 400 is damaged, the gas from the external gas source enters the second piston chamber 102 through the external valve group from the second air inlet 131 to drive the second piston 3 to open the channel between the second air inlet 131 and the second air outlet 132, so that the external gas enters the fire extinguishing tank 100 from the second air outlet 132 to discharge the extinguishing agent. Compared with the method of directly spraying the extinguishing agent from the fire extinguishing tank in the prior art, the differential pressure start-up spray valve of this embodiment can ensure that the pressure driving the movement of the extinguishing agent is always relatively stable, so that the fire extinguishing tank 100 can spray the extinguishing agent evenly.

[0034] In some embodiments, such as Figure 1As shown, the first piston 2 has a first large end 22 and a first small end 21. The first large end 22 is disposed toward the communicating cavity 103, and the first small end 21 is used to open or block the passage between the first air inlet 111 and the first air outlet 112. The second piston 3 has a second large end 32 and a second small end 31. The second large end 32 is disposed toward the communicating cavity 103, and the second small end 31 is used to open or block the passage between the second air inlet 131 and the second air outlet 132. It is understandable that both the first piston 2 and the second piston 3 have a larger dimension at the end facing the connecting cavity 103. Thus, when the external sealing tube is intact, even if there is a leak, external gas will enter through the first air inlet 111 and the second air inlet 131. Because the first small end 21 and the second small end 31 are smaller, the force exerted by the leaking airflow on them cannot exceed the weight of the first piston 2 and the second piston 3. This improves the reliability of the entire differential pressure-activated injection valve and prevents the differential pressure-activated injection valve from opening (i.e., gas being discharged from the second air outlet 132) due to accidental leakage or a fall. It should be noted that the specific dimensions, shapes, and other parameters of the first large end 22, the first small end 21, the second large end 32, and the second small end 31 can be selected according to actual needs. No limitations are imposed on the parameters of the first large end 22, the first small end 21, the second large end 32, and the second small end 31 here.

[0035] In some specific embodiments, such as Figure 1As shown, the first piston chamber 101 includes a first mating chamber 1011, a first air inlet chamber 1012, and a first air outlet chamber 1013. The first mating chamber 1011 mates with the first piston member 2 and communicates with the first air inlet chamber 1012 and the first air outlet chamber 1013. The first air inlet chamber 1012 has a first straight section 10121 and a first gradually expanding section 10122. The end of the first straight section 10121 away from the first gradually expanding section 10122 forms a first air inlet 111. The size of the first gradually expanding section 10122 gradually increases in the direction away from the first straight section 10121. A first sealing groove 211 is provided on the first small end 21. A first sealing member 4 is fitted in the first sealing groove 211, and the first sealing member 4 can abut against the side wall of the first gradually expanding section 10122. It is understood that the first mating cavity 1011 ensures the stable movement of the first piston 2, and the first intake cavity 1012 has a first gradually expanding section 10122. This allows the first small end 21 to stably seal the first intake cavity 1012 when inserted, thereby ensuring the blocking effect of the first piston 2 on the first intake port 111 and the first outlet 112. Simultaneously, the added first sealing element 4 further enhances the sealing of the first small end 21 on the first intake cavity 1012. It should be noted that in this embodiment, the material and model of the first sealing element 4 can be selected according to actual needs, and a specific description of the first sealing element 4 is not provided here.

[0036] In some more specific embodiments, such as Figure 1 As shown, a second sealing groove 212 is provided on the first small end 21, and a second sealing element 5 is provided in the second sealing groove 212. The outer peripheral wall of the second sealing element 5 abuts against the inner sidewall of the first mating cavity 1011; and / or: a third sealing groove 221 is provided on the first large end 22, and a third sealing element 6 is provided in the third sealing groove 221. The outer peripheral wall of the third sealing element 6 abuts against the inner sidewall of the first mating cavity 1011. It can be understood that the added second sealing element 5 and third sealing element 6 can ensure the sealing performance between the entire first piston 2 and the inner sidewall of the first mating cavity 1011, thereby improving the reliability of the entire differential pressure start-up injection valve. It should be noted that in this embodiment, the material and model parameters of the second sealing element 5 and the third sealing element 6 can be selected according to actual needs, and the second sealing element 5 and the third sealing element 6 will not be specifically described here.

[0037] In some specific embodiments, such as Figure 1As shown, the second piston chamber 102 includes a second mating chamber 1021, a second air inlet chamber 1022, and a second air outlet chamber 1023. The second mating chamber 1021 mates with the second piston member 3 and communicates with the second air inlet chamber 1022 and the second air outlet chamber 1023. The second air inlet chamber 1022 has a second straight section 10221 and a second gradually expanding section 10222. The end of the second straight section 10221 away from the second gradually expanding section 10222 forms a second air inlet 131. The size of the second gradually expanding section 10222 gradually increases in the direction close to the second straight section 10221. A fourth sealing groove 311 is provided on the second small end 31. A fourth sealing member 7 is fitted in the fourth sealing groove 311, and the fourth sealing member 7 can abut against the side wall of the second gradually expanding section 10222. It is understood that the second mating cavity 1021 ensures the stable movement of the second piston 3, and the second intake cavity 1022 has a second gradually expanding section 10222. This allows the second small end 31 to stably seal the second intake cavity 1022 when inserted, thereby ensuring the blocking effect of the second piston 3 on the second intake port 131 and the second outlet port 132. Simultaneously, the added fourth sealing element 7 further enhances the sealing of the second small end 31 on the second intake cavity 1022. It should be noted that in this embodiment, the material and model of the fourth sealing element 7 can be selected according to actual needs; therefore, a specific description of the fourth sealing element 7 is not provided here.

[0038] In some more specific embodiments, such as Figure 1 As shown, a fifth sealing groove 312 is provided on the second small end 31, and a fifth sealing element 8 is provided in the fifth sealing groove 312. The outer peripheral wall of the fifth sealing element 8 abuts against the inner sidewall of the second mating cavity 1021; and / or: a sixth sealing groove 321 is provided on the second large end 32, and a sixth sealing element 9 is provided in the sixth sealing groove 321. The outer peripheral wall of the sixth sealing element 9 abuts against the inner sidewall of the second mating cavity 1021. It can be understood that the added fifth sealing element 8 and sixth sealing element 9 can ensure the sealing performance between the entire second piston 3 and the inner sidewall of the second mating cavity 1021, thereby improving the reliability of the entire differential pressure start-up injection valve.

[0039] In some embodiments, such as Figure 1As shown, the housing 1 includes a first housing portion 11, a second housing portion 12, and a third housing portion 13. One end of the second housing portion 12 is connected to the first housing portion 11 to define a first piston chamber 101. The first housing portion 11 has a first air inlet 111 and a first air outlet 112. One end of the second housing portion 12 is connected to the third housing portion 13 to define a second piston chamber 102. The third housing portion 13 has a second air inlet 131 and a second air outlet 132. It is understood that compared to a one-piece molded housing 1, assembling the housing 1 into the first housing portion 11, the second housing portion 12, and the third housing portion 13 simplifies the manufacturing process and reduces the manufacturing cost of the housing 1. Preferably, the first housing portion 11 and the second housing portion 12 are threaded together, and the third housing portion 13 is threaded together with the second housing portion 12. This facilitates the assembly of the housing 1 and improves its sealing performance.

[0040] Example:

[0041] The following is for reference. Figure 1 The specific structure of a differential pressure-activated jet valve according to a particular embodiment of the present invention is described.

[0042] like Figure 1 As shown, the differential pressure-activated injection valve of this embodiment includes a housing 1, a first piston 2, and a second piston 3. The housing 1 includes a first housing portion 11, a second housing portion 12, and a third housing portion 13. One end of the second housing portion 12 is connected to the first housing portion 11 to define a first piston chamber 101. The first housing portion 11 is provided with a first air inlet 111 and a first air outlet 112. One end of the second housing portion 12 is connected to the third housing portion 13 to define a second piston chamber 102. The third housing portion 13 is provided with a second air inlet 131 and a second air outlet 132. The second housing 1 has a connecting cavity 103 located between the first piston chamber 101 and the second piston chamber 102, and the connecting cavity 103 is connected to an external closed pipe. The first piston 2 has a first large end 22 and a first small end 21. The first large end 22 is disposed toward the communicating cavity 103, and the first small end 21 is used to open or block the channel between the first air inlet 111 and the first air outlet 112. The second piston 3 has a second large end 32 and a second small end 31. The second large end 32 is disposed toward the communicating cavity 103, and the second small end 31 is used to open or block the channel between the second air inlet 131 and the second air outlet 132.

[0043] The first piston chamber 101 includes a first mating chamber 1011, a first intake chamber 1012, and a first exhaust chamber 1013. The first mating chamber 1011 mates with the first piston member 2 and communicates with the first intake chamber 1012 and the first exhaust chamber 1013. The first intake chamber 1012 has a first straight section 10121 and a first expanding section 10122. The end of the first straight section 10121 away from the first expanding section 10122 forms a first intake port 111. The size of the first expanding section 10122 gradually increases in the direction away from the first straight section 10121. A first sealing groove 211 and a second sealing groove 212 are provided on the first small end 21. A first sealing member 4 is fitted in the first sealing groove 211, and the first sealing member 4 can abut against the side wall of the first expanding section 10122. A second sealing member 5 is provided in the second sealing groove 212, and the outer peripheral wall of the second sealing member 5 abuts against the inner side wall of the first mating chamber 1011. The first large end 22 is provided with a third sealing groove 221, and a third sealing element 6 is provided in the third sealing groove 221. The outer peripheral wall of the third sealing element 6 abuts against the inner side wall of the first mating cavity 1011.

[0044] The second piston chamber 102 includes a second mating chamber 1021, a second air inlet chamber 1022, and a second air outlet chamber 1023. The second mating chamber 1021 mates with the second piston member 3 and communicates with the second air inlet chamber 1022 and the second air outlet chamber 1023. The second air inlet chamber 1022 has a second straight section 10221 and a second gradually expanding section 10222. The end of the second straight section 10221 away from the second gradually expanding section 10222 forms a second air inlet 131. The size of the second gradually expanding section 10222 gradually increases in the direction close to the second straight section 10221. A fourth sealing groove 311 and a fifth sealing groove 312 are provided on the second small end 31. A fourth sealing member 7 is fitted in the fourth sealing groove 311, and the fourth sealing member 7 can abut against the side wall of the second gradually expanding section 10222. The outer peripheral wall of the fifth sealing element 8 abuts against the inner side wall of the second mating cavity 1021. The second large end 32 is provided with a sixth sealing groove 321, and a sixth sealing element 9 is provided in the sixth sealing groove 321. The outer peripheral wall of the sixth sealing element 9 abuts against the inner side wall of the second mating cavity 1021.

[0045] This invention also discloses a fire extinguishing system, such as Figure 2As shown, the fire extinguishing system of this embodiment includes a fire extinguishing tank 100, a gas cylinder 200, a pressure reducing valve 300, and the differential pressure-activated jet valve mentioned above. The fire extinguishing tank 100 is used to load the extinguishing agent, the gas cylinder 200 is used to load the protective gas, and the pressure reducing valve 300 has a pressure reducing inlet and a pressure reducing outlet. The first air inlet 111 is connected to the gas cylinder 200, the first air outlet 112 is connected to the pressure reducing inlet, the second air inlet 131 is connected to the pressure reducing outlet, the second air outlet 132 is connected to the fire extinguishing tank 100, and the connecting chamber 103 is connected to the fire detection tube 400. It can be understood that when the fire detection tube 400 is kept closed, even if the differential pressure-activated jet valve leaks, gas entering the first piston chamber 101 from the first air inlet 111 cannot push the first piston 2 to move, and gas entering the second piston chamber 102 from the second air inlet 131 cannot push the second piston 3 to move. In other words, even if the differential pressure-activated spray valve leaks, the extinguishing agent inside the fire extinguishing tank 100 will not be ejected, thus improving the reliability of the fire extinguishing system. Furthermore, the double-sealed structure extends the system's service life. Simultaneously, when the fire detection tube 400 is damaged, gas from an external gas source enters the second piston chamber 102 through the external valve assembly from the second inlet 131, driving the second piston 3 to open the channel between the second inlet 131 and the second outlet 132. This allows external gas to enter the fire extinguishing tank 100 from the second outlet 132, discharging the extinguishing agent. Compared to the prior art's direct spraying of the extinguishing agent from the fire extinguishing tank, the differential pressure-activated spray valve in this embodiment ensures that the pressure driving the extinguishing agent remains relatively stable, allowing the fire extinguishing tank 100 to uniformly spray the extinguishing agent.

[0046] In some embodiments, such as Figure 2 As shown, the fire extinguishing system also includes a fire extinguishing pipe 500, one end of which is closed, and the other end is connected to the fire extinguishing tank 100. The fire extinguishing pipe 500 is equipped with multiple fire extinguishing nozzles. This allows the extinguishing agent to be sprayed evenly and over a large area onto the fire zone, improving the fire extinguishing efficiency and effectiveness of the system.

[0047] In some embodiments, such as Figure 2 As shown, the fire extinguishing canister 100 is a piston-type fire extinguishing canister. A piston plate 110 is provided inside the fire extinguishing canister 100, dividing the internal space of the fire extinguishing canister 100 into an extinguishing chamber 130 and a driving chamber 120. The driving chamber 120 is connected to a second air outlet 132, and the extinguishing chamber 130 is provided with an extinguishing outlet. Using a piston-type fire extinguishing canister can further improve the uniformity of the sprayed extinguishing agent, thereby improving the fire extinguishing efficiency and effect of the fire extinguishing system. Of course, in other embodiments of the present invention, other structures such as capsule-type fire extinguishing canisters can also be used.

[0048] The following is for reference. Figure 2The specific structure of a fire extinguishing system according to a particular embodiment of the present invention is described.

[0049] like Figure 2 As shown, the fire extinguishing system of this embodiment includes a fire extinguishing tank 100, a gas cylinder 200, a pressure reducing valve 300, a fire detection tube 400, a differential pressure-activated jet valve, and a fire extinguishing pipe 500. The gas cylinder 200 is used to load protective gas. The pressure reducing valve 300 has a pressure reducing inlet and a pressure reducing outlet. The structure of the differential pressure-activated jet valve has been clearly described above and will not be repeated here. Only the connection relationship between the differential pressure-activated jet valve and other components is described. The fire extinguishing tank 100 is used to load extinguishing agent. The fire extinguishing tank 100 is provided with a piston plate 110, which divides the internal space of the fire extinguishing tank 100 into an extinguishing chamber 130 and a driving chamber 120. The driving chamber 120 is connected to the second gas outlet 132, and the extinguishing chamber 130 is provided with an extinguishing outlet. The first air inlet 111 is connected to the gas cylinder 200, the first air outlet 112 is connected to the pressure reducing inlet, the second air inlet 131 is connected to the pressure reducing outlet, the second air outlet 132 is connected to the fire extinguishing tank 100, and the connecting cavity 103 is connected to the fire detection tube 400. One end of the fire extinguishing pipe 500 is closed, and the other end is connected to the fire extinguishing tank 100, and the fire extinguishing pipe 500 is equipped with multiple fire extinguishing nozzles.

[0050] The advantages of the fire extinguishing system in this embodiment are as follows:

[0051] First: It achieves a double seal, ensuring that even with minor leaks during long-term operation, the piston will not be pushed to spray out the extinguishing agent.

[0052] Second: The structure is simple and the response is fast, which solves the problem of accidental opening in complex designs;

[0053] Third, the differential pressure start-up type spray valve uses suitable sealing components, which can prevent leakage from low temperatures of -60 degrees Celsius to high temperatures of 200 degrees Celsius, thus improving the reliability of the fire extinguishing system.

[0054] Fourth: During use, the differential pressure start-up injection valve will not be accidentally opened regardless of the direction of use, severe vibration, or falls from a height, ensuring high reliability;

[0055] Fifth: It solves the industry problem that when only a fire detection tube is used in the existing technology, the melting of the fire detection tube will prevent the fire from being extinguished at other fire sources.

[0056] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0057] The above description is only a preferred embodiment of the present invention. For those skilled in the art, there will be changes in the specific implementation and application scope based on the ideas of the present invention. The content of this specification should not be construed as a limitation of the present invention.

Claims

1. A differential pressure-activated injection valve, characterized in that, include: A housing (1) defines a first piston chamber (101), a second piston chamber (102), and a connecting chamber (103). The connecting chamber (103) is located between the first piston chamber (101) and the second piston chamber (102) and is used to connect to an external closed pipe. The first piston chamber (101) has a first air inlet (111) and a first air outlet (112). The second piston chamber (102) has a second air inlet (131) and a second air outlet (132). The first air inlet (111) is connected to an external air source. The second air inlet (131) is connected to the first air outlet (112) through an external valve group. The first piston (2) is disposed in the first piston chamber (101) and is used to open or block the passage between the first air inlet (111) and the first air outlet (112). The second piston (3) is disposed within the second piston chamber (102) and is used to open or block the passage between the second air inlet (131) and the second air outlet (132); wherein: When the external sealed pipe is damaged, external gas enters the first piston chamber (101) from the first inlet (111) to drive the first piston (2) to open the channel between the first inlet (111) and the first outlet (112). The external gas enters the second piston chamber (102) from the second inlet (131) through the external valve group to drive the second piston (3) to open the channel between the second inlet (131) and the second outlet (132) so that the external gas is discharged from the second outlet (132). The first piston (2) has a first large end (22) and a first small end (21). The first large end (22) is disposed toward the communicating cavity (103), and the first small end (21) is used to open or block the passage between the first air inlet (111) and the first air outlet (112). The second piston (3) has a second large end (32) and a second small end (31), the second large end (32) is disposed toward the communicating cavity (103), and the second small end (31) is used to open or block the passage between the second air inlet (131) and the second air outlet (132); The first piston chamber (101) includes a first mating chamber (1011), a first intake chamber (1012), and a first exhaust chamber (1013). The first mating chamber (1011) mates with the first piston member (2) and communicates with the first intake chamber (1012) and the first exhaust chamber (1013). The first intake chamber (1012) has a first straight section (10121) and a first gradually expanding section (10122). The first straight section (10121) The first air inlet (111) is formed at the end away from the first gradually expanding section (10122). The size of the first gradually expanding section (10122) gradually increases in the direction away from the first straight section (10121). A first sealing groove (211) is provided on the first small end (21). A first sealing member (4) is fitted in the first sealing groove (211), and the first sealing member (4) can abut against the side wall of the first gradually expanding section (10122). The second piston chamber (102) includes a second mating chamber (1021), a second intake chamber (1022), and a second exhaust chamber (1023). The second mating chamber (1021) mates with the second piston member (3) and communicates with the second intake chamber (1022) and the second exhaust chamber (1023). The second intake chamber (1022) has a second straight section (10221) and a second gradually expanding section (10222). The second straight section (10221)... 1) A second air inlet (131) is formed at the end away from the second gradually expanding section (10222). The size of the second gradually expanding section (10222) gradually increases in the direction close to the second straight section (10221). A fourth sealing groove (311) is provided on the second small end (31). A fourth sealing member (7) is fitted in the fourth sealing groove (311), and the fourth sealing member (7) can abut against the side wall of the second gradually expanding section (10222).

2. The differential pressure start-up type injection valve according to claim 1, characterized in that, The first small end (21) is provided with a second sealing groove (212), and a second sealing element (5) is provided in the second sealing groove (212). The outer peripheral wall of the second sealing element (5) abuts against the inner sidewall of the first mating cavity (1011); and / or: The first large end (22) is provided with a third sealing groove (221), and a third sealing element (6) is provided in the third sealing groove (221). The outer peripheral wall of the third sealing element (6) abuts against the inner side wall of the first mating cavity (1011).

3. The differential pressure start-up type injection valve according to claim 1, characterized in that, The second small end (31) is provided with a fifth sealing groove (312), and a fifth sealing element (8) is provided in the fifth sealing groove (312). The outer peripheral wall of the fifth sealing element (8) abuts against the inner sidewall of the second mating cavity (1021); and / or: The second large end (32) is provided with a sixth sealing groove (321), and a sixth sealing element (9) is provided in the sixth sealing groove (321). The outer peripheral wall of the sixth sealing element (9) abuts against the inner side wall of the second mating cavity (1021).

4. The differential pressure start-up injection valve according to any one of claims 1-3, characterized in that, The housing (1) includes a first housing portion (11), a second housing portion (12) and a third housing portion (13). One end of the second housing portion (12) is connected to the first housing portion (11) to define the first piston chamber (101). The first housing portion (11) is provided with the first air inlet (111) and the first air outlet (112). One end of the second housing portion (12) is connected to the third housing portion (13) to define the second piston chamber (102). The third housing portion (13) is provided with the second air inlet (131) and the second air outlet (132).

5. A fire extinguishing system, characterized in that, include: Fire extinguishing container (100), wherein the fire extinguishing container (100) is used to contain fire extinguishing agent; A gas cylinder (200) for loading a protective gas; A pressure reducing valve (300) having a pressure reducing inlet and a pressure reducing outlet; According to any one of claims 1-4, the differential pressure start-up type injection valve is wherein the first air inlet (111) is connected to the gas cylinder (200), the first air outlet (112) is connected to the pressure reducing inlet, the second air inlet (131) is connected to the pressure reducing outlet, the second air outlet (132) is connected to the fire extinguishing canister (100), and the connecting cavity (103) is connected to the fire detection tube (400).

6. The fire extinguishing system according to claim 5, characterized in that, The fire extinguishing system also includes a fire extinguishing pipe (500), one end of which is closed and the other end is connected to the fire extinguishing tank (100), and the fire extinguishing pipe (500) is provided with multiple fire extinguishing nozzles.

7. The fire extinguishing system according to claim 5, characterized in that, The fire extinguishing canister (100) is a piston-type fire extinguishing canister. The fire extinguishing canister (100) is provided with a piston plate (110). The piston plate (110) divides the internal space of the fire extinguishing canister (100) into a fire extinguishing chamber (130) and a driving chamber (120). The driving chamber (120) is connected to the second air outlet (132). The fire extinguishing chamber (130) is provided with a fire extinguishing outlet.

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