A low temperature freeze resistant foam fire extinguisher

Abstract

The utility model discloses a low temperature freeze -resistant foam fire extinguisher, including fire extinguisher body, the tank wall of fire extinguisher body is equipped with annular cavity, install four silica gel heating sheet in annular cavity, four silica gel heating sheet is cross type distribution, and opposite two silica gel heating sheet is a group, and two silica gel heating sheet of same group are connected in series, two groups silica gel heating sheet are connected in parallel, and the bottom of fire extinguisher body is equipped with cavity, and the power supply system of being the power supply of silica gel heating sheet is equipped with in the cavity. Through setting two groups silica gel heating sheet, two silica gel heating sheet of each group are opposite and set up, thereby can heat to both sides of fire extinguisher body, to carry out the wide -range heating to fire extinguishing agent. When any group silica gel heating sheet is damaged, can start another group silica gel heating sheet, thereby heating fire extinguishing agent.

Description

Technical Field

[0001] This utility model relates to the field of fire-fighting equipment technology, specifically a low-temperature antifreeze foam fire extinguisher. Background Technology

[0002] Aqueous film-forming foam (AFFF) fire extinguishers are fire extinguishers that use AFFF as the extinguishing agent. AFFF is a new type of high-efficiency foam extinguishing agent developed in the early 1960s. Its components consist of fluorocarbon surfactants, hydrocarbon surfactants, additives, and water. Existing AFFF fire extinguishers lack dosage control devices, which leads to waste of AFFF during use. In addition, the applicable range of fire extinguishers is relatively small. In cold environments, the extinguishing agent and water inside may freeze, rendering the fire extinguisher unusable.

[0003] Currently, antifreeze foam fire extinguishers have appeared on the market. They mainly use heating elements installed on the fire extinguisher to heat the extinguishing agent. However, the current antifreeze fire extinguishers have the following problems: (1) The heating element is either a single piece or multiple small pieces connected in series. If the single piece is damaged, it will not work. If the pieces are connected in series, the circuit will be blocked due to the damage of the heating element, so it cannot heat properly; (2) The heating element can only heat the fire extinguisher canister and cannot heat the nozzle. The nozzle is very easy to freeze, which will cause the nozzle to be blocked. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a low-temperature antifreeze foam fire extinguisher to solve the problem mentioned in the background section that the heating element is difficult to function properly after damage.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] A low-temperature antifreeze foam fire extinguisher includes a fire extinguisher body. The inner wall of the fire extinguisher body has an annular cavity. Four silicone heating pads are installed in the annular cavity. The four silicone heating pads are arranged in a cross shape, and two opposite silicone heating pads form a group. Two silicone heating pads in the same group are connected in series, and two groups of silicone heating pads are connected in parallel. The bottom of the fire extinguisher body has a cavity, and a power supply system for supplying power to the silicone heating pads is installed in the cavity.

[0007] Preferably, the power supply system includes a battery and a control board installed in the cavity, a switch installed on one side below the fire extinguisher body, two sets of silicone heating elements, the switch and the battery forming a closed circuit, and the switch controls the two sets of silicone heating elements to work independently.

[0008] In the above technical solution, the switch is a toggle type. When it is toggled to both sides, it can connect to the two sets of silicone heating elements respectively. When the switch is in the middle position, it is in a broken state with both sets of silicone heating elements.

[0009] Preferably, a battery cover is snapped onto the bottom of the fire extinguisher body.

[0010] The above technical solution allows for easy battery replacement via a battery cover.

[0011] Preferably, the annular cavity is filled with a thermal insulation layer.

[0012] The above technical solution uses polyurethane foam for the insulation layer, which has excellent insulation effect and can perfectly fill the annular cavity.

[0013] Preferably, the nozzle of the fire extinguisher body is threadedly connected to an end cap, and the outer side of the end cap is provided with a groove, with a cleaning needle fixed in the center of the groove.

[0014] In the above technical solution, when the nozzle of the fire extinguisher body is frozen, the end cap is removed, the unblocking needle is pointed towards the nozzle, and then the end cap is screwed on to unblock the nozzle through the unblocking needle.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] By installing two sets of silicone heating elements, with two elements in each set positioned opposite each other, the extinguisher body can be heated on both sides, thus providing a wide-area heating of the extinguishing agent. If one set of silicone heating elements fails, the other set can be activated to continue heating the extinguishing agent.

[0017] When the nozzle of the fire extinguisher is frozen, remove the end cap, point the unblocking needle toward the nozzle, and then unscrew the end cap to clear the nozzle through the unblocking needle. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a cross-sectional view of the present invention;

[0020] Figure 3 This is a cross-sectional view of the fire extinguisher body;

[0021] Figure 4 This is the circuit schematic diagram of this utility model;

[0022] In the diagram: 1-Fire extinguisher body, 2-Annular cavity, 3-Silicone heating element, 4-Battery, 5-Control board, 6-On / off switch, 7-Battery cover, 8-Insulation layer, 9-End cap, 10-Draining needle. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example 1

[0025] Please see Figures 1-4 A low-temperature antifreeze foam fire extinguisher includes an extinguisher body 1. The extinguisher body has a steel tank containing an extinguishing agent. A valve assembly is located at the top of the tank to control the release of the extinguishing agent. The valve assembly includes a safety pin, a lever, a valve stem, and a seal. Compressed nitrogen is stored in the upper space of the tank. When the valve is opened, the gas pressure forces the foam out. The extinguisher body also has a spray gun, which typically includes a switch (trigger) and a foam generator. The foam generator is a special nozzle device that draws in air when the foam liquid flows at high speed, mechanically agitating it to form foam for spraying. In use, the safety pin is removed, and the lever is pressed to open the valve. Under the pressure of the driving gas (nitrogen), the premixed AFFF aqueous solution flows to the spray gun through a siphon tube and hose. When the solution passes at high speed through the foam generator inside the spray gun, air is drawn in and violently mixed, forming a large amount of foam. The extinguisher body 1 described in this embodiment is prior art, and related products are available on the market; therefore, it will not be described in detail in this embodiment.

[0026] The fire extinguisher body 1 has an annular cavity 2 inside its canister wall. Four silicone heating elements 3 are installed within the annular cavity 2, arranged in a cross shape. Two opposite heating elements 3 form a group, with the two elements in the same group connected in series. Two groups of heating elements 3 are connected in parallel. The bottom of the fire extinguisher body 1 has a cavity containing a power supply system for the silicone heating elements 3. The power supply system includes a battery 4 and a control board 5 installed within the cavity, and a switch 6 installed on one side below the fire extinguisher body 1. The two groups of silicone heating elements 3, the switch 6, and the battery 4 form a closed circuit. The switch 6 controls the independent operation of the two groups of silicone heating elements 3. The switch 6 is a toggle switch; toggling it to either side connects it to the two groups of silicone heating elements. When the switch 6 is in the middle position, it is disconnected from both groups of silicone heating elements.

[0027] The bottom of the fire extinguisher body 1 is fitted with a battery cover 7 for easy replacement of the battery 4. The annular cavity 2 is filled with an insulation layer 8 made of polyurethane foam, which has excellent heat preservation effect and can perfectly fill the annular cavity.

[0028] The silicone heating element described in this embodiment is made by sandwiching a metal heating element (etched alloy foil or resistance wire) between silicone fiberglass cloth and then pressing them together at high temperature. Silicone heating elements are existing technology and will not be described in detail in this embodiment.

[0029] In summary, by setting up two sets of silicone heating elements 3, with two silicone heating elements 3 in each set positioned opposite each other, both sides of the fire extinguisher body 2 can be heated to provide a wide-area heating of the extinguishing agent. If any set of silicone heating elements fails, the other set can be activated to heat the extinguishing agent.

[0030] Example 2

[0031] Based on Embodiment 1, the nozzle of the fire extinguisher body 1 is threadedly connected to an end cap 9. The outer side of the end cap 9 is provided with a groove, and a cleaning needle 10 is fixed in the center of the groove. When the nozzle of the fire extinguisher body is frozen, the end cap is removed, the cleaning needle is oriented towards the nozzle, and then the end cap is screwed on to clear the nozzle through the cleaning needle.

[0032] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low-temperature antifreeze foam fire extinguisher, characterized in that: The fire extinguisher includes a fire extinguisher body (1), and an annular cavity (2) is provided inside the canister wall of the fire extinguisher body (1). Four silicone heating elements (3) are installed in the annular cavity (2). The four silicone heating elements (3) are arranged in a cross shape, and two opposite silicone heating elements (3) form a group. Two silicone heating elements (3) in the same group are connected in series, and two groups of silicone heating elements (3) are connected in parallel. The bottom of the fire extinguisher body (1) is provided with a cavity, and a power supply system for supplying power to the silicone heating elements (3) is provided in the cavity.

2. The low-temperature antifreeze foam fire extinguisher according to claim 1, characterized in that: The power supply system includes a battery (4) and a control board (5) installed in the cavity, a switch (6) installed on one side below the fire extinguisher body (1), two sets of silicone heating elements (3), the switch (6) and the battery (4) form a closed circuit, and the switch (6) controls the two sets of silicone heating elements (3) to work independently.

3. A low-temperature antifreeze foam fire extinguisher according to claim 2, characterized in that: The bottom of the fire extinguisher body (1) is fitted with a battery cover (7).

4. A low-temperature antifreeze foam fire extinguisher according to claim 3, characterized in that: The annular cavity (2) is filled with a heat insulation layer (8).

5. A low-temperature antifreeze foam fire extinguisher according to claim 4, characterized in that: The fire extinguisher body (1) has an end cap (9) threadedly connected to the nozzle. The outer side of the end cap (9) has a groove, and a cleaning needle (10) is fixed in the center of the groove.

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