A tear gas grenade

Abstract

The application discloses a tear bomb, and relates to the field of law enforcement protection equipment, which comprises a bomb shell and a piston, the bomb shell is internally provided with a storage cavity capable of storing tear gas, the storage cavity is provided with an open end and a closed end capable of being broken under pressure, one end of the bomb shell close to the closed end is provided with a spraying port, the piston comprises a main body part and a blocking part connected with the main body part, the radial cross-section diameter of the blocking part is smaller than that of the main body part, the main body part is sealingly arranged at the open end and is capable of moving towards the closed end under the action of driving force, the blocking part is opposite to the spraying port and extends towards the spraying port, so that when the driving force of the piston is eliminated, the blocking part can extend into the spraying port to block the spraying port, and when the piston stops moving, the blocking part on the piston can reach the position of the spraying port to block the spraying port, thereby avoiding the pollution of residual tear gas in the storage cavity which cannot be completely sprayed to the spraying port.

Description

Technical Field

[0001] This invention relates to the field of law enforcement protective equipment, and more particularly to a tear gas canister. Background Technology

[0002] As a non-lethal riot control weapon, tear gas's core function is to disperse or control targets by spraying tear gas, while avoiding permanent damage. Long-range tear gas is an important type, requiring a long effective range, high spray accuracy, and maintaining a moderate concentration of irritant at the endpoint to achieve "high efficiency, low harm, and precision" tactical target control.

[0003] Currently, common long-range tear gas grenades employ a gunpowder-driven structure: the high-pressure gas generated by gunpowder combustion serves as the power source, pushing a piston to move axially along the projectile body. The piston compresses the liquid within the tear gas chamber, accelerating it out through the nozzle to form a directional jet or atomized cone. This structure has advantages such as compact design, rapid response, and high initial velocity, and has been widely used.

[0004] However, in practical use, the above structure has inherent performance defects. The propellant thrust is relatively abundant at the beginning of the piston stroke, allowing the tear gas to gain sufficient kinetic energy for effective spraying. However, as the piston moves to the end of its stroke, the combustion chamber volume increases sharply, and the propellant gas pressure naturally decreases, resulting in a non-linear decrease in piston thrust. At this point, the tear gas in the final section of the tear gas chamber (near the end of the piston stroke) receives significantly insufficient thrust, and its ejection velocity cannot maintain the threshold required for effective spraying. This low-velocity liquid cannot overcome the resistance and surface tension of the nozzle flow channel, and cannot smoothly detach from the nozzle, ultimately accumulating at the nozzle opening, adhering to the walls, or dripping along the projectile, forming residual liquid. This residual liquid not only directly reduces the effective loading and utilization rate of the tear gas grenade, but also may cause contamination of non-target areas (such as near the launcher or in crosswind areas) due to irregular dripping, and may even injure unrelated personnel, seriously affecting the safety and controllability of its use.

[0005] To overcome these problems, the commonly used solution in existing technologies is to increase the amount of primer charge or use more potent propellant, i.e., to increase the primer's power. However, while increasing the overall propellant energy can compensate for the terminal thrust decay to some extent, allowing the tear gas to achieve a barely perceptible initial velocity, the cost is significant: the muzzle energy, initial velocity, and peak pressure of the entire projectile all increase substantially, resulting in excessively high jet impact energy; simultaneously, the high-pressure jet may over-atomize or splash in the near field, increasing the difficulty of controlling the accuracy. Furthermore, the excessively high energy output also exacerbates wear and recoil in the launcher (such as a riot gun), reducing system reliability.

[0006] Therefore, there is an urgent need to provide an improved long-range tear gas projectile that can effectively eliminate tear gas residue at the end of the piston stroke without significantly increasing the propellant energy. Summary of the Invention

[0007] The purpose of this invention is to provide a tear gas canister to solve the problems existing in the prior art. When the piston stops moving, the sealing part on the piston can reach the spray nozzle position and seal it, so as to prevent residual tear gas in the storage cavity from contaminating the spray nozzle.

[0008] To achieve the above objectives, the present invention provides the following solution: A tear gas canister includes a cartridge case and a piston. The cartridge case has a storage cavity for storing tear gas. The storage cavity has an open end and a closed end that can be ruptured under pressure. A spray port is provided on the cartridge case near the closed end. The piston includes a main body and a sealing part connected to the main body. The radial cross-sectional diameter of the sealing part is smaller than that of the main body. The main body is sealed at the open end and can move toward the closed end under a driving force. The sealing part is directly opposite to the spray port and extends toward the spray port so that when the driving force of the piston is removed, the sealing part can extend into the spray port to block the spray port.

[0009] In one embodiment, both the main body and the sealing part are cylindrical, and the injection port is a circle with a diameter that matches the shape and size of the sealing part.

[0010] As one embodiment, it also includes a nozzle, which is fixed to one end of the cartridge case near the closed end, and the nozzle is provided with the spray port.

[0011] As one embodiment, along the spray direction of the tear gas, the nozzle also has a tapered cavity with a gradually decreasing diameter, and the smaller diameter end of the tapered cavity is connected to the spray port.

[0012] As one embodiment, the piston further includes a transition section connecting the main body and the sealing portion.

[0013] As one embodiment, a sealing structure is provided at one end of the nozzle near the storage cavity. After the nozzle is connected to the cartridge case, the sealing structure is sealed to the end of the storage cavity to form the closed end.

[0014] As one embodiment, the sealing structure is a sealing membrane.

[0015] As one embodiment, the nozzle and the cartridge case are detachably connected.

[0016] In one embodiment, a first sealing ring is provided on the side wall of the sealing part near the injection port, and the first sealing ring can seal the gap between the sealing part and the inner wall of the injection port; a second sealing ring is provided on the side wall of the main body, and the second sealing ring can seal the gap between the main body and the inner wall of the storage cavity; a third sealing ring is provided on the side wall of the nozzle, and the third sealing ring can seal the gap between the nozzle and the inner wall of the cartridge case.

[0017] As one embodiment, the main body is provided with a cavity, and one end of the cavity away from the sealing part is open.

[0018] As one embodiment, it also includes a firing mechanism disposed on the cartridge case at one end away from the ejection port, for applying a pushing force to the piston.

[0019] In one embodiment, the firing mechanism is fixed to the end of the cartridge case by a primer retaining sleeve.

[0020] Compared with the prior art, the present invention has the following technical effects: This invention provides a sealing portion extending towards the nozzle on the piston's main body. Because the sealing portion is closer to the nozzle, when the piston's driving force disappears and the piston body, or the piston as a whole, stops moving, the sealing portion can reach the nozzle and seal it, preventing residual tear gas from the storage chamber from contaminating the nozzle and causing harm to personnel. Furthermore, the tear gas canister in this invention replaces the existing method of increasing the primer's power to expel all the tear gas, ensuring the safety of tear gas canister use. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of a tear gas canister before it is sprayed, according to one embodiment of the present invention. Figure 2 This is a schematic diagram of the structure of a tear gas canister after it has been sprayed, according to one embodiment of the present invention.

[0023] Figure label: 1. Shell casing; 2. Piston; 21. Main body; 22. Sealing part; 23. Transition section; 24. First sealing ring; 25. Second sealing ring; 3. Tear gas; 4. Nozzle; 41. Injection port; 42. Conical cavity; 43. Third sealing ring; 44. Sealing membrane; 5. Firing mechanism; 6. Primer retainer sleeve. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] The purpose of this invention is to provide a tear gas canister to solve the problems existing in the prior art. When the piston stops moving, the sealing part on the piston can reach the spray nozzle position and seal it, so as to prevent residual tear gas in the storage cavity from contaminating the spray nozzle.

[0026] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] like Figure 1 , Figure 2 As shown, this embodiment provides a tear gas canister, including a cartridge case 1 and a piston 2. The cartridge case 1 has a storage cavity for storing tear gas 3. In this embodiment, the tear gas 3 is a liquid or solid powder containing tear gas components (such as capsaicin). The storage cavity has an open end and a closed end that can be ruptured under pressure; a spray port 41 is provided on the cartridge case 1 near the closed end. In this embodiment, the piston 2 includes a main body 21 and a sealing part 22 connected to the main body 21. The radial cross-sectional diameter of the sealing part 22 is smaller than the radial cross-sectional diameter of the main body 21. The main body 21 is sealed at the open end and can move toward the closed end under the action of driving force; the sealing part 22 is directly opposite to the spray port 41 and extends toward the spray port 41 so that when the driving force of the piston 2 is eliminated, the sealing part 22 can extend into the spray port 41 to seal it.

[0028] In this embodiment, the axial direction points to the extension direction of the cartridge case 1, which is also the direction of movement of the piston 2 in the storage cavity, and the radial direction is perpendicular to the axial direction.

[0029] When in use, the storage chamber is filled with tear gas 3, and the open end of the storage chamber is sealed by piston 2. Figure 1As shown. After the driving force is released, piston 2 moves towards the closed end under the action of the driving force. When piston 2 moves, tear gas 3 is squeezed. This pressure is transmitted to the closed end of the storage cavity, and the closed end is broken under the pressure. The closed end opens, and tear gas 3 in the storage cavity flows out from the broken closed end and is finally sprayed out through the spray nozzle 41. As piston 2 moves, the driving force on piston 2 gradually weakens, and piston 2 stops moving before it has completely pushed out tear gas 3. In this embodiment, piston 2 has a main body 21 and a sealing part 22 extending towards the spray nozzle 41. The main body 21 is mainly used to seal the open end of the storage cavity and receive the driving force to push tear gas 3 out of the storage cavity. The sealing part 22 is closer to the spray nozzle 41 than the main body 21. When the main body 21 and the sealing part 22 stop moving, the sealing part 22 has blocked the spray nozzle 41. The tear gas 3 remaining between the main body 21 and the spray nozzle 41 cannot leak from the spray nozzle 41. Figure 2 As shown.

[0030] Therefore, in this embodiment, a sealing portion 22 extending towards the spray nozzle 41 is provided on the main body 21 of the piston 2. Since the sealing portion 22 is closer to the spray nozzle 41, when the driving force of the piston 2 disappears and the main body of the piston 2, or the piston 2 as a whole, stops moving, the sealing portion 22 can reach the spray nozzle 41 and seal it, thus preventing residual tear gas 3 that cannot be completely sprayed out of the storage chamber from contaminating the spray nozzle 41 and causing harm to personnel. At the same time, the tear gas canister in this embodiment also replaces the method in the prior art of spraying out all the tear gas 3 by increasing the power of the primer, ensuring the safety of tear gas canister use.

[0031] In this embodiment, both the main body 21 and the sealing part 22 are cylindrical, and the injection port 41 is circular with a diameter that matches the shape and size of the sealing part 22. Of course, the injection port 41 in this embodiment can also adopt other suitable shapes, such as polygonal shapes.

[0032] In this embodiment, a first sealing ring 24 is provided on the side wall of the sealing part 22 near the spray nozzle 41. The first sealing ring 24 can seal the gap between the sealing part 22 and the inner wall of the spray nozzle 41, preventing the residual tear gas 3 from leaking through this gap. A second sealing ring 25 is provided on the side wall of the main body 21. The second sealing ring 25 can seal the gap between the main body 21 and the inner wall of the storage cavity, preventing the tear gas 3 from leaking from the open end of the storage cavity.

[0033] This embodiment also includes a nozzle 4, which is fixed to the end of the cartridge case 1 near the closed end. The nozzle 4 has a spray port 41. Along the spray direction of the tear gas 3, the nozzle 4 also has a tapered cavity 42 with a gradually decreasing diameter, and the smaller diameter end of the tapered cavity 42 communicates with the spray port 41. This type of nozzle 4 is more suitable for situations where the tear gas 3 is a liquid. The tapered cavity 42 can guide the flow of the tear gas liquid and accelerate its spray velocity. When the tear gas liquid flows from the larger diameter end of the tapered cavity 42 to the smaller diameter end of the spray port 41, the flow cross-sectional area gradually decreases. According to the principle of fluid continuity and Bernoulli's equation, the flow velocity of the tear gas liquid will significantly increase, thereby forming a high-speed jet, increasing the spray distance and impact force. Simultaneously, the tear gas liquid is more easily broken into fine droplets, enhancing its diffusion effect.

[0034] In this embodiment, the piston 2 also includes a transition section 23 connecting the main body 21 and the sealing part 22. The transition section 23 has a conical structure. The connection positions between the conical structure and the main body 21 and the sealing part 22 are all provided with transition fillets.

[0035] In this embodiment, a cavity is provided on the main body 21, and the end of the cavity away from the sealing part 22 is open. The driving force of the piston 2 usually comes from the primer or other devices. For example, when a primer is used, the piston 2 is moved by increasing the gas pressure in one side chamber of the piston 2 (located on the side away from the sealing part 22) (for example, by rapidly increasing the gas temperature in the chamber through gunpowder combustion). The cavity on the main body 21 of the piston 2 has the following functions: First, it can appropriately increase the volume of the chamber, avoiding the situation where the volume of the chamber is too small due to the piston 2 end face being close to the primer, so that the gas cannot generate sufficient thrust after being heated and expanded; Second, the chamber and the cavity are connected through the open end. After the high-pressure gas in the chamber enters the cavity, its pressure will act on the side wall of the cavity (i.e., the inner wall of the main body 21), so that the second sealing ring 25 on the side wall of the main body 21 fits more tightly against the inner wall of the storage cavity, thereby ensuring the sealing performance.

[0036] In this embodiment, a sealing structure is provided at one end of the nozzle 4 near the storage cavity. After the nozzle 4 is connected to the cartridge case 1, the sealing structure is sealed to the end of the storage cavity to form a closed end.

[0037] In this embodiment, the sealing structure is a sealing membrane 44, which can be made of aluminum, copper, plastic or other materials, and its connection with the nozzle 4 can be a heat-fusion connection.

[0038] In this embodiment, the cartridge case 1 has a cylindrical structure, and the internal cavity of the cartridge case 1 is a storage cavity. The sealing structure on the nozzle 4 can abut against the inner wall of the cartridge case 1 to form a seal.

[0039] In this embodiment, the detachable connection between the nozzle 4 and the cartridge 1 can also be achieved using a non-detachable fastening method. When a detachable connection is used, a threaded connection can be employed; if a non-detachable fastening method is used, welding or bonding can be employed.

[0040] In this embodiment, a third sealing ring 43 is provided on the side wall of the nozzle 4, which can seal the gap between the nozzle 4 and the inner wall of the cartridge case 1.

[0041] This embodiment also includes a firing mechanism 5, which is disposed on the end of the cartridge case 1 away from the ejection port 41 and is used to apply a pushing force to the piston 2.

[0042] In this embodiment, the firing mechanism 5 can be an electronically fired primer (including but not limited to current-fired primers and voltage-fired primers) or a firing pin primer, which is fixed to the end of the cartridge case 1 by a primer fixing sleeve 6.

[0043] The firing mechanism 5 in this embodiment can also be a high-pressure gas cylinder, a compression spring, an electromagnetic launching mechanism, etc., which can drive the piston 2 through high-pressure gas, spring force, etc.

[0044] Any adaptive changes made according to actual needs are within the scope of protection of this invention.

[0045] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A tear gas canister, characterized in that, include: A cartridge case, wherein the cartridge case is provided with a storage cavity for storing tear gas; The storage cavity has an open end and a closed end that can be ruptured under pressure; A jet nozzle is provided on one end of the cartridge case near the closed end; A piston, comprising a main body and a plugging part connected to the main body, wherein the radial cross-sectional diameter of the plugging part is smaller than the radial cross-sectional diameter of the main body, the main body is sealed at the open end and is capable of moving toward the closed end under the action of a driving force; The blocking part is directly opposite the injection port and extends toward the injection port so that when the driving force of the piston is eliminated, the blocking part can extend into the injection port to block the injection port.

2. The tear gas canister according to claim 1, characterized in that, Both the main body and the sealing part are cylindrical, and the injection port is a circle with a diameter that matches the shape and size of the sealing part.

3. The tear gas canister according to claim 1, characterized in that, It also includes a nozzle, which is fixed to one end of the cartridge case near the closed end, and the nozzle is provided with the spray port.

4. The tear gas canister according to claim 3, characterized in that, Along the direction of the tear gas spray, the nozzle also has a tapered cavity with a gradually decreasing diameter, and the smaller diameter end of the tapered cavity is connected to the spray port.

5. The tear gas canister according to claim 4, characterized in that, The piston also includes a transition section connecting the main body and the sealing part.

6. The tear gas canister according to claim 3, characterized in that, A sealing structure is provided at one end of the nozzle near the storage cavity. After the nozzle is connected to the cartridge case, the sealing structure is sealed to the end of the storage cavity to form the closed end.

7. The tear gas canister according to claim 6, characterized in that, The sealing structure is a sealing membrane.

8. The tear gas canister according to claim 3, characterized in that, The nozzle is detachably connected to the cartridge case.

9. The tear gas canister according to claim 3, characterized in that, A first sealing ring is provided on the side wall of the sealing part near the injection port, and the first sealing ring can seal the gap between the sealing part and the inner wall of the injection port; a second sealing ring is provided on the side wall of the main body, and the second sealing ring can seal the gap between the main body and the inner wall of the storage cavity; a third sealing ring is provided on the side wall of the nozzle, and the third sealing ring can seal the gap between the nozzle and the inner wall of the cartridge case.

10. The tear gas canister according to claim 1, characterized in that, The main body has a cavity, and the cavity is open at one end away from the sealing part.

11. The tear gas canister according to claim 1, characterized in that, It also includes a firing mechanism disposed on the cartridge case at one end away from the nozzle, for applying a pushing force to the piston.

12. The tear gas canister according to claim 11, characterized in that, The firing mechanism is fixed to the end of the cartridge case by a primer retaining sleeve.

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