Normal pressure tear gas projector

Abstract

The application discloses a normal-pressure tear gas sprayer and relates to the technical field of police apparatuses. The existing tear gas sprayer has the problems of slow leakage of pre-charged gas leading to failure and the like. The application comprises an outer cylinder, a transparent tank, a bag assembly and a gas tank protection support. A closed cavity is formed between the inner wall of the transparent tank and the bag, and the cavity is under normal pressure in the production and storage states. The gas tank protection support is fixedly biased on the inner bottom wall of the transparent tank, and a pre-pressurized gas tank, a spring and a ejector pin are sequentially arranged in the gas tank protection support. In use, the bottom of the outer cylinder is hit against the ground or a wall surface, the pre-pressurized gas tank is moved downward under the action of inertia and pierces the air release piece, and high-pressure gas is released into the closed cavity to compress the bag into a standby state. The application eliminates the risk of slow leakage through normal-pressure storage, maximizes the volume of the bag through the biasing of the gas tank, and ensures that the spraying duration meets the industry standard. The pressure state in the tank is visualized through the arrangement of a pressure-sensitive color-changing film on the inner wall of the transparent tank. The device can be triggered only by single-handed hitting, is convenient to operate and has high applicability in actual combat.

Description

Technical Field

[0001] This invention relates to the field of police equipment and non-lethal riot control equipment, and in particular to an atmospheric pressure tear gas sprayer and its transparent canister assembly. Background Technology

[0002] Tear gas sprayers are non-lethal weapons widely used by public security, armed police, and security personnel in handling emergencies and in self-defense and riot control. Their core principle is to atomize and spray tear gas agents (such as OC or CS solutions) into the target area through physical or mechanical means to achieve dispersion and control.

[0003] Existing portable tear gas sprayers are mainly divided into two categories:

[0004] Pre-charged tear gas sprayer

[0005] The canisters are already filled with high-pressure driving gas at the factory, and the capsules or reagents are under constant pressure. While these products have a simple structure, they have significant drawbacks:

[0006] During long-term storage, high-pressure gas is prone to slow leakage, which leads to a decrease in spray distance and duration.

[0007] In high-temperature, sun-exposed, or fire-prone environments, the internal pressure of the canister rises sharply with increasing temperature, posing a risk of explosion.

[0008] Because the tank is a pressure vessel, the production, testing, and transportation costs are relatively high.

[0009] Mechanically compressed tear gas sprayer

[0010] Spraying is achieved by manually pressing or squeezing the bladder using a spring mechanism. While this type of product solves the safety hazards of long-term pressurized storage, it generally suffers from problems such as unstable spray power, short range, and high operating force.

[0011] Furthermore, both pre-pressurized and mechanical products lack intuitive and reliable pressure status indication methods. Users cannot quickly confirm whether the injector is in an effective ready-to-fire state before tactical actions, especially in environments of severe impact, drop, or low temperature. This can easily lead to situations where the injector is "filled but not pressurized" or "falsely judged to have been triggered," seriously affecting its reliability in actual combat.

[0012] Therefore, there is an urgent need for a tear gas sprayer and its key components that can achieve safe storage at atmospheric pressure and provide pressure visualization through a simple structure. Summary of the Invention

[0013] The present invention aims to solve the above-mentioned problems existing in the prior art, and provides an atmospheric pressure tear gas sprayer and a matching transparent canister assembly with pressure visualization, which achieves reliable triggering and intuitive status identification while ensuring safe storage.

[0014] First invention concept: atmospheric pressure tear gas sprayer

[0015] The present invention provides a normal pressure tear gas sprayer, comprising an outer cylinder, a transparent canister, a bag assembly, a nozzle, a pressure handle, and a canister protection bracket;

[0016] A gas tank protection bracket is fixedly installed at the lower part of the inner cavity of the transparent tank, and a vent hole is opened at the top of the gas tank protection bracket;

[0017] The gas tank protection bracket is equipped with a pre-pressurized gas tank, spring B, ejector pin and ejector pin base from top to bottom.

[0018] The vent plate of the pre-compressed air tank faces downwards and is directly opposite the tip of the ejector pin. The spring B elastically abuts the pre-compressed air tank against the top of the air tank protection bracket, keeping the pre-compressed air tank and the ejector pin in an initial state of non-contact.

[0019] A sealed cavity is formed between the inner wall of the transparent can and the outer surface of the bag, and this sealed cavity is at normal pressure during production, storage and transportation.

[0020] When in use, the pre-pressurized gas tank is triggered and releases high-pressure gas into the sealed cavity, compressing the capsule and deforming it, and spraying the tear gas solution through the nozzle.

[0021] Furthermore, in order to increase the drug loading capacity and meet the equipment parameter standards, the gas tank protection bracket is offset relative to the central axis of the transparent tank, and one side of it is attached to the inner wall of the transparent tank to increase the effective volume of the bag.

[0022] Furthermore, the gas tank protective bracket and the transparent tank are made of the same material and are fixedly connected by adhesive.

[0023] Furthermore, the gas pre-filled in the pre-pressurized gas tank is nitrogen or carbon dioxide.

[0024] Furthermore, the pre-pressurized gas canister is triggered by inertia: the bottom of the vertical outer cylinder of the tear gas sprayer is struck against the ground, wall, or hard surface; at the moment of impact, the pre-pressurized gas canister moves downward relative to the gas canister protection bracket under inertia and moves towards the ejector pin, causing the ejector pin to pierce the vent plate of the pre-pressurized gas canister; the pre-pressurized gas is released through the vent hole into the sealed cavity between the inner wall of the transparent canister and the bag, causing the tear gas sprayer to enter the spraying working state.

[0025] Second inventive concept: a transparent tank assembly with pressure visualization

[0026] The present invention also provides a transparent canister assembly for a tear gas sprayer with pressure visualization, comprising:

[0027] A transparent canister, the interior of which is used to house the bag assembly, and a sealed cavity is formed between the inner wall of the transparent canister and the outer surface of the bag;

[0028] A pressure-sensitive color-changing film is attached to the inner wall of the transparent can, corresponding to the position of the window opened on the outer cylinder;

[0029] The pressure-sensitive color-changing film is configured to display a first color when the sealed cavity is under normal pressure and a second color when the sealed cavity is under positive pressure, so as to visually indicate the working status of the tear gas sprayer.

[0030] Furthermore, a pressure-sensitive color-changing film is attached to the inner wall of the transparent can corresponding to the window of the outer cylinder to indicate the pressurized state of the cavity between the inner wall of the transparent can and the outer surface of the bag after the impact operation.

[0031] Regarding the unity of invention: The atmospheric pressure tear gas sprayer described in Embodiment 1 of the present invention (claim 1) and the transparent canister assembly with pressure visualization described in Embodiment 2 of the present invention (claim 2) belong to the same general inventive concept. They are technically related and contain the same specific technical feature, namely, "a sealed cavity is formed between the inner wall of the transparent canister (5) and the outer surface of the pouch (6a), and a pressure-sensitive color-changing film (17) is provided on the inner wall of the transparent canister corresponding to the outer cylinder window to indicate the pressure state of the cavity." This feature is not a conventional means in the art. Its common function is to solve the technical problems of tear gas sprayer storage safety and pressure state visualization indication, and it makes a substantial contribution to the prior art. Therefore, claims 1 and 2 have the unity of invention as stipulated in Article 31 of the Patent Law and can be filed as a single patent application.

[0032] Beneficial effects

[0033] Significantly improved safety: Because the external cavity of the tear gas capsule is kept at normal pressure during storage, the risk of explosion and chronic leakage caused by high-pressure containers is completely eliminated, and the product shelf life is greatly extended.

[0034] Compact structure and optimized volume: The offset design of the gas cylinder protection bracket maximizes the volume of the bag without increasing the outer cylinder diameter, which is beneficial for the mandatory testing of the drug filling amount in the public security industry standard.

[0035] Status visible and operation reliable: By observing the color change of the pressure-sensitive color-changing film, users can intuitively determine whether the injector has been triggered or is under pressure without the need for any tools, which significantly improves tactical reaction speed and operational safety.

[0036] High compatibility: The transparent canister assembly is designed to be versatile, and can be used in the atmospheric pressure tear gas sprayer of this invention, or as an independent component in other types of tear gas spraying devices.

[0037] This invention has a compact structure and reliable operation, fully meeting the stringent requirements of single-police equipment for safety, reliability, and tactical applicability.

[0038] Comparison table of this invention and prior art:

[0039] Storage pressure High pressure (prone to leakage) Atmospheric pressure Atmospheric pressure Operation method single-hand press Rotate both hands One-handed impact Gas tank location center center bias Spray duration Meets standards Substandard Meets standards Practicality Difference generally powerful Stress visualization No No have Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0041] Figure 1 A front sectional view of the overall structure of the present invention (in storage state).

[0042] Figure 2 A side sectional view of the present invention (assembly structure of gas tank protection bracket and pre-pressurized gas tank).

[0043] Figure 3 A magnified cross-sectional view of the state at the moment of impact triggering in this invention.

[0044] Figure 4 This invention relates to a partial cross-sectional view of a pressure-sensitive color-changing film attached to the inner wall of a transparent tank corresponding to the outer cylinder window.

[0045] Explanation of markings in the diagram:

[0046] 1-Ejector pin; 2-Gas tank protection bracket; 2a-Vent hole; 3-Outer cylinder; 3a-Window; 4-Pre-compressed gas tank; 5-Transparent tank; 6-Bag assembly; 6a-Bag; 7-Spring A; 8-Valve sleeve; 9-Valve core; 10-Aluminum valve cup; 11-Assembly seat; 12-Nozzle; 12a-Liquid outlet; 13-Pressure handle; 14-Sealing gasket; 15-Spring B; 16-Ejector pin base; 17-Pressure-sensitive color-changing film. Detailed Implementation

[0047] The invention will now be further described with reference to the accompanying drawings.

[0048] Example 1: Atmospheric Pressure Tear Gas Sprayer

[0049] like Figure 1 As shown, a normal pressure tear gas sprayer includes an outer cylinder 3, a transparent canister 5, a bag assembly 6, a nozzle 12, a pressure handle 13, and a canister protection bracket 2.

[0050] A gas tank protection bracket 2 is fixedly installed in the lower part of the inner cavity of the transparent tank 5. The top of the bracket has a vent hole 2a. Inside the gas tank protection bracket 2, from top to bottom, a pre-pressurized gas tank 4, a spring B15, a ejector pin 1, and an ejector pin base 16 are assembled sequentially. The vent plate of the pre-pressurized gas tank 4 faces downward and is directly opposite the tip of the ejector pin 1. The spring B15 elastically presses the pre-pressurized gas tank 4 against the top of the gas tank protection bracket 2, so that it maintains a safe distance from the ejector pin 1 when not subjected to external force.

[0051] A sealed cavity is formed between the inner wall of the transparent can 5 and the outer surface of the bag 6a. This cavity is kept at normal pressure during production, storage and transportation.

[0052] Triggering process:

[0053] The tear gas sprayer is held vertically, and the bottom of the outer cylinder 3 is struck against the ground or a hard surface. Upon impact, the pre-pressurized gas canister 4, under inertia, overcomes the spring force of spring B15 and moves downwards, causing the ejector pin 1 to pierce the vent plate at the bottom of the pre-pressurized gas canister 4. The pre-pressurized gas is rapidly released through the vent hole 2a into the sealed cavity between the transparent canister 5 and the capsule 6a, creating a high-pressure environment that deforms the capsule 6a, forcing the tear gas liquid out at high speed through the nozzle 12.

[0054] Bias optimization:

[0055] like Figure 3 As shown, the gas tank protection bracket 2 is offset relative to the central axis of the transparent tank 5, with one side plane fitting against the inner wall of the transparent tank 5. This structure effectively utilizes the cross-sectional space of the tank, significantly increasing the volume of the bladder 6a and meeting the stringent requirements for drug dosage in the equipment parameters.

[0056] Example 2: Transparent tank assembly with pressure visualization

[0057] like Figure 2 As shown, a transparent canister assembly for a tear gas sprayer with pressure visualization includes a transparent canister 5 and a pressure-sensitive color-changing membrane 17.

[0058] The transparent container 5 is used to house the capsule assembly 6, and a sealed cavity is formed between its inner wall and the outer surface of the capsule 6a. The pressure-sensitive color-changing film 17 is attached to the inner wall of the transparent container 5, and its position corresponds to the observation window 3a opened on the outer cylinder 3.

[0059] The pressure-sensitive color-changing film 17 is made of a pressure-sensitive functional polymer material and has bistable color characteristics:

[0060] When the sealed cavity is at normal pressure (not triggered), the pressure-sensitive color-changing film 17 is colorless or light-colored (first color);

[0061] When the pre-pressurized gas tank 4 is triggered and positive pressure is formed in the sealed cavity, the pressure-sensitive color-changing film 17 undergoes a chemical or physical color-changing reaction under the action of air pressure, turning into a dark or conspicuous warning color (second color).

[0062] During operation, the user can accurately determine whether the sprayer has entered the pressurized, ready-to-fire state simply by observing the color of the pressure-sensitive color-changing membrane 17 through the outer cylinder window 3a. This transparent canister assembly is not only suitable for the atmospheric pressure tear gas sprayer of this embodiment, but can also be used as an independent functional component in other types of tear gas spraying devices.

Claims

1. A normal pressure tear gas sprayer, characterized in that, It includes an outer cylinder (3), a transparent canister (5), a bag assembly (6), a nozzle (12), a pressure handle (13), and a gas canister protection bracket (2); A gas tank protection bracket (2) is fixedly installed in the lower part of the inner cavity of the transparent tank (5), and a vent hole (2a) is opened on the top of the gas tank protection bracket (2); The gas tank protection bracket (2) is equipped with a pre-pressurized gas tank (4), spring B (15), ejector pin (1) and ejector pin base (16) from top to bottom inside; The vent plate of the pre-pressurized gas tank (4) faces downward and is directly opposite the tip of the ejector pin (1). The spring B (15) elastically abuts the pre-pressurized gas tank (4) against the top of the gas tank protection bracket (2), so that the pre-pressurized gas tank (4) and the ejector pin (1) remain in an initial state of non-contact. A sealed cavity is formed between the inner wall of the transparent can (5) and the outer surface of the bag (6a), and the sealed cavity is at normal pressure during production, storage and transportation. When in use, the pre-pressurized gas tank (4) is triggered and releases high-pressure gas into the sealed cavity, which compresses the bag (6a) to deform and sprays the tear gas through the nozzle (12).

2. A transparent canister assembly for a tear gas sprayer with pressure visualization, characterized in that, include: A transparent container (5) is used to house the bag assembly (6), and a sealed cavity is formed between the inner wall of the transparent container (5) and the outer surface of the bag (6a); A pressure-sensitive color-changing film (17) is attached to the inner wall of the transparent can (5) and corresponds to the position of the window (3a) opened on the outer cylinder (3); The pressure-sensitive color-changing film (17) is configured to display a first color when the sealed cavity is under normal pressure and a second color when the sealed cavity is under positive pressure, so as to visually indicate the working status of the tear gas sprayer.

3. The atmospheric pressure tear gas sprayer according to claim 1, characterized in that: The gas tank protection bracket (2) is offset relative to the central axis of the transparent tank (5), and one side of it is attached to the inner wall of the transparent tank (5) to increase the effective volume of the bag (6a).

4. The atmospheric pressure tear gas sprayer according to claim 1, characterized in that: The gas tank protection bracket (2) and the transparent tank (5) are made of the same material and are fixedly connected by adhesive.

5. The atmospheric pressure tear gas sprayer according to claim 1, characterized in that: The gas pre-filled in the pre-pressurized gas tank (4) is nitrogen or carbon dioxide.

6. The atmospheric pressure tear gas sprayer according to claim 1, characterized in that: The pre-pressurized gas tank (4) is triggered by inertia: the tear gas sprayer is vertically inserted into the bottom of the outer cylinder (3) and impacts the ground, wall or hard surface; At the moment of impact, the pre-pressurized gas tank (4) moves downward relative to the gas tank protection bracket (2) and toward the ejector pin (1) under the action of inertia, causing the ejector pin (1) to pierce the vent plate of the pre-pressurized gas tank (4); The pre-pressurized gas is released through the vent (2a) into the sealed cavity between the inner wall of the transparent canister (5) and the bag (6a), so that the tear gas sprayer enters the spraying working state.

7. The atmospheric pressure tear gas sprayer according to claim 1, characterized in that: A pressure-sensitive color-changing film (17) is pasted on the inner wall of the transparent can (5) corresponding to the window (3a) of the outer cylinder (3) to indicate the pressurized state of the cavity between the inner wall of the transparent can (5) and the outer surface of the bag after the impact operation.

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