Low temperature freeze resistant foam fire extinguisher valve structure

Abstract

The utility model discloses a low temperature freeze -resistant foam fire extinguisher valve structure, including the valve body, the bottom of valve body is equipped with the import, one side of valve body is equipped with the export, the upper portion in valve body is equipped with the cavity, and one side of export and the cavity is linked together, and the top of import and the bottom of cavity are linked together, and the valve rod is movably arranged in the cavity, and the upper end of valve rod is out of the top of valve body, and the upper end of valve body is equipped with the extrusion mechanism of extruding valve rod, the lower end fixedly connected with the valve core of valve rod, and the valve core is located in the import, and is blocked in the top of import, the outer wall of valve core is equipped with a ring of annular groove, and the annular groove is integrated with the electric heating film, and one side of valve body is connected with the shell that protrudes outward, and the shell is equipped with the power module that supplies power for electric heating film in, when the valve core is frozen because of low temperature, can supply power to electric heating film, make electric heating film work to heat the valve core, prevent the valve core from freezing, be favorable to the injection of fire extinguishing agent.

Description

Technical Field

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

[0002] Aqueous film-forming foam (AFFF) fire extinguishers use AFFF as the extinguishing agent. AFFF is a new type of high-efficiency foam extinguishing agent developed in the early 1960s. Its components include fluorocarbon surfactants, hydrocarbon surfactants, additives, and water. However, existing AFFF fire extinguishers have a limited range of applications. In cold environments, the extinguishing agent and water inside may freeze. Therefore, conventional valves are prone to freezing and jamming at low temperatures. Additionally, the foam extinguishing agent itself becomes viscous at low temperatures, making spraying difficult and rendering the fire extinguisher unusable. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a valve structure for a low-temperature antifreeze foam fire extinguisher, thereby solving the problem of valve spraying difficulties caused by low temperatures mentioned in the background art.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0005] A valve structure for a low-temperature antifreeze foam fire extinguisher includes a valve body with an inlet at the bottom and an outlet on one side. The upper part of the valve body has a cavity, with the outlet connected to one side of the cavity and the top of the inlet connected to the bottom of the cavity. A valve stem is movably mounted within the cavity, with its upper end extending from the top of the valve body. A compression mechanism for the valve stem is located at the upper end of the valve body. A valve core is fixedly connected to the lower end of the valve stem. The valve core is made of polytetrafluoroethylene (PTFE), which has a low coefficient of friction and is antifreeze. The diameter of the top of the inlet is smaller than the diameter of the cavity, while the diameter of the lower part of the inlet is larger than the diameter of the valve core. The diameter of the valve core is larger than the diameter of the valve stem. The valve core is located within the inlet and seals the top of the inlet. An annular groove is provided on the outer wall of the valve core, within which an electric heating film is integrated. A protruding shell is connected to one side of the valve body, and a power supply module for powering the electric heating film is located within the shell.

[0006] Preferably, the compression mechanism includes a sleeve fixedly connected to the top of the valve body, the top and bottom of the sleeve being through and communicating with the cavity. The upper end of the valve stem passes through the sleeve and exits through it. A spring is provided inside the sleeve, and the spring is sleeved around the valve stem. A lower handle is fixedly connected to the upper end of the valve body, and an upper handle is hinged to the lower handle. The inner wall of the upper handle is provided with a pressure block that matches the top of the valve stem. Pressing the upper handle downward can compress the valve stem through the pressure block, causing the valve stem to move downward. The lower handle and the upper handle are provided with matching insertion holes. The lower handle and the upper handle are fixed by inserting a pin into the insertion holes. The outer end of the pin is connected to a pull rope, and one end of the pull rope is fixed to the lower handle.

[0007] In the above technical solution, when the fire extinguisher is not needed, the pin is inserted into the socket, thus restricting the movement of the upper handle and preventing accidental opening of the valve. When the fire extinguisher needs to be used, the pin is pulled out, and the upper handle is pressed down. The upper handle, through a pressure block, squeezes the valve stem, which in turn squeezes the spring, causing the valve core to move downward, thereby connecting the inlet, cavity, and outlet to achieve the spraying of the extinguishing agent. When the upper handle is released, under the action of the spring, the valve stem moves upward, causing the valve core to return to its original position, thus closing the inlet and cavity.

[0008] Preferably, the power supply module includes a control board and battery pack disposed inside the housing, a switch mounted on the housing, a connecting channel provided inside the valve stem and valve core, the housing and annular groove being connected through the channel, the control board, battery pack, switch and heating film forming a closed circuit through wires, and a battery cover being fastened to the end of the housing.

[0009] The above technical solution can activate the heating film by toggling the switch, thereby heating the valve core and preventing it from freezing.

[0010] Preferably, the outer wall of the valve body inlet end is provided with a first external thread, and the outer wall of the inlet end is provided with a first sealing ring; the outer wall of the valve body outlet end is provided with a second external thread, and the outer wall of the outlet end is provided with a second sealing ring.

[0011] In the above technical solution, the inlet end of the valve body is connected to the fire extinguisher canister via a first external thread, and the outlet end of the valve body is used to connect to the nozzle. The setting of the first sealing ring and the second sealing ring improves the sealing performance.

[0012] Preferably, the top of the inlet and the top of the valve core are both conical, and the two conical surfaces are provided with mutually cooperating steps, and a third sealing ring is provided on both the horizontal and vertical surfaces of the steps.

[0013] The above technical solution improves the sealing performance of the valve core and prevents the extinguishing agent from leaking by setting steps on the inlet and valve core, and by setting two layers of third sealing rings.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] When the valve core freezes due to low temperature, power can be supplied to the heating film to make the heating film work, thereby heating the valve core and preventing it from freezing, so as to facilitate the spraying of the extinguishing agent.

[0016] By setting mutually matching steps on the inlet and valve core, and simultaneously installing two layers of third sealing rings, the sealing performance of the valve core is improved, preventing the leakage of extinguishing agent. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a front sectional view of the present invention installed on a fire extinguisher tank;

[0019] Figure 3 This is a side sectional view of the present invention installed on a fire extinguisher canister;

[0020] Figure 4 for Figure 3 A magnified view of a portion of the image;

[0021] In the diagram: 1-valve body, 2-inlet, 3-outlet, 4-cavity, 5-valve stem, 6-compression mechanism, 601-sleeve, 602-spring, 603-lower handle, 604-upper handle, 605-pressure block, 606-pin, 607-pull rope, 7-valve core, 8-heating film, 9-housing shell, 10-control board, 11-battery pack, 12-on / off switch, 13-channel, 14-battery cover, 15-first sealing ring, 16-second sealing ring, 17-third sealing ring. Detailed Implementation

[0022] 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.

[0023] Example 1

[0024] Please see Figures 1-4 A valve structure for a low-temperature antifreeze foam fire extinguisher includes a valve body 1, an inlet 2 at the bottom of the valve body 1, an outlet 3 on one side of the valve body 1, a cavity 4 in the upper part of the valve body 1, the outlet 3 communicating with one side of the cavity 4, the top of the inlet 2 communicating with the bottom of the cavity 4, a valve stem 5 movably disposed in the cavity 4, the upper end of the valve stem 5 passing through the top of the valve body 1, a compression mechanism 6 for compressing the valve stem 5 at the upper end of the valve body 1, and a valve core 7 fixedly connected to the lower end of the valve stem 5. The valve core is made of polytetrafluoroethylene, which has a low coefficient of friction and is also antifreeze. The diameter of the top of the inlet 2 is smaller than the diameter of the cavity 4, the diameter of the lower part of the inlet 2 is larger than the diameter of the valve core 7, the diameter of the valve core 7 is larger than the diameter of the valve stem 5, and the valve core 7 is located inside the inlet 2 and seals the top of the inlet 2. When the valve core is blocked at the top of the inlet, the channel and the inlet are closed. When the valve core moves downward and leaves the cavity, the cavity and the inlet can be connected because the diameter of the lower part of the inlet is larger than the diameter of the valve core 7. This connects the outlet, the cavity, and the inlet so that the extinguishing agent can be sprayed.

[0025] The outer wall of the inlet end of the valve body 1 is provided with a first external thread, and a first sealing ring 15 is provided on the outer wall of the inlet end; the inlet end of the valve body is connected to the fire extinguisher canister through the first external thread, and the sealing performance between the valve and the fire extinguisher canister is improved by the action of the first sealing ring 15. The outer wall of the outlet end of the valve body 1 is provided with a second external thread, and a second sealing ring 16 is provided on the outer wall of the outlet end; the outlet end of the valve body is connected to the nozzle through the first thread. The nozzle is made of flexible pipe, and a nozzle is connected to the end of the nozzle. The sealing performance between the valve and the nozzle is improved by the setting of the second sealing ring.

[0026] Specifically, the compression mechanism 6 includes a sleeve 601 fixedly connected to the top of the valve body 1. The top and bottom of the sleeve 601 are connected and communicate with the cavity 4. The upper end of the valve stem 5 passes through the sleeve 601 and exits through the sleeve. A spring 602 is provided inside the sleeve 601 and is sleeved around the valve stem 5. A lower handle 603 is fixedly connected to the upper end of the valve body 1. An upper handle 604 is hinged to the lower handle 603. The inner wall of the upper handle 604 is provided with a pressure block 605 that matches the top of the valve stem 5. Pressing the upper handle 604 downward can compress the valve stem 5 through the pressure block 605, causing the valve stem 5 to move downward. The lower handle 603 and the upper handle 604 are provided with matching insertion holes. The lower handle 603 and the upper handle 604 are fixed by inserting a pin 606 into the insertion hole.

[0027] When the fire extinguisher is not needed, the pin 606 is inserted into the socket, thus restricting the movement of the upper handle 604 and preventing accidental opening of the valve. When the fire extinguisher needs to be used, the pin 606 is pulled out, and the upper handle 604 is pressed down. The upper handle 604, through the pressure block 605, presses the valve stem 5, which in turn presses the spring 602, causing the valve core 7 to move downward, thereby connecting the inlet 2, the cavity 4, and the outlet 3, enabling the spraying of the extinguishing agent. When the upper handle 604 is released, under the action of the spring 602, the valve stem 5 moves upward, causing the valve core 7 to return to its original position, thus closing the inlet and the cavity.

[0028] The outer end of the pin 606 is connected to a pull rope 607, one end of which is fixed to the lower handle 603. After the pin is pulled out, the pull rope prevents the pin from being lost and allows it to be reinserted into the socket.

[0029] The outer wall of the valve core 7 has an annular groove, within which an electrothermal film 8 is integrated. A protruding housing 9 is connected to one side of the valve body 1, and a power supply module for powering the electrothermal film 8 is located within the housing 9. The power supply module includes a control board 10 and a battery pack 11 housed within the housing, and a switch 12 mounted on the housing. A connecting channel 13 connects the valve stem 5 and the valve core 7, linking the housing 9 and the annular groove. The control board 10, battery pack 11, switch 12, and electrothermal film 8 form a closed circuit via wires. A battery cover 14 is attached to the end of the housing 9. By moving the switch 12, the electrothermal film 8 is activated, thereby heating the valve core 7 and preventing it from freezing.

[0030] The electrothermal film is a semi-transparent polyester film that generates heat when electricity is applied. It is made by processing and hot-pressing conductive special ink and metal current-carrying strips between insulating polyester films. Electrothermal film is existing technology, and related products are available on the market. This embodiment will not describe its specific structure and principle in detail.

[0031] The battery pack described in this embodiment uses a low-temperature resistant lithium iron phosphate battery (3.2V / 10Ah) with an operating temperature of -45℃ to 60℃.

[0032] Example 2

[0033] Based on Embodiment 1, the top of the inlet 2 and the top of the valve core 7 are both conical, and the two conical surfaces are provided with mutually cooperating steps. A third sealing ring 17 is provided on both the horizontal and vertical surfaces of the steps. By providing mutually cooperating steps on the inlet 2 and the valve core 7, and simultaneously providing two layers of third sealing rings 17, the sealing performance of the valve core 7 is improved, preventing the leakage of extinguishing agent.

[0034] 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.

[0035] 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 cryogenically resistant, freeze-proof, foam fire extinguisher valve structure, characterized by: The valve body (1) includes an inlet (2) at its bottom and an outlet (3) on one side. A cavity (4) is located in the upper part of the valve body (1), with the outlet (3) connected to one side of the cavity (4). The top of the inlet (2) is connected to the bottom of the cavity (4). A valve stem (5) is movably disposed within the cavity (4), with its upper end extending from the top of the valve body (1). A pressing mechanism (6) for pressing the valve stem (5) is located at the upper end of the valve body (1), and the lower end of the valve stem (5) is fixedly connected to... There is a valve core (7), the diameter of the top of the inlet (2) is smaller than the diameter of the cavity (4), the diameter of the bottom of the inlet (2) is larger than the diameter of the valve core (7), the diameter of the valve core (7) is larger than the diameter of the valve stem (5), the valve core (7) is located inside the inlet (2) and is sealed at the top of the inlet (2); the outer wall of the valve core (7) is provided with a ring groove, and an electric heating film (8) is integrated in the ring groove. One side of the valve body (1) is connected to an outwardly protruding shell (9), and a power supply module for powering the electric heating film (8) is provided inside the shell (9).

2. A cryogenic freeze resistant foam fire extinguisher valve structure according to claim 1, wherein: The extrusion mechanism (6) includes a sleeve (601) fixedly connected to the top of the valve body (1). The top and bottom of the sleeve (601) are connected and communicate with the cavity (4). The upper end of the valve stem (5) passes through the sleeve (601) and exits through the sleeve. A spring (602) is provided inside the sleeve (601). The spring (602) is sleeved around the valve stem (5). A lower handle (603) is fixedly connected to the upper end of the valve body (1). An upper handle (604) is hinged to the lower handle (603). The inner wall of the upper handle (604) is provided with a pressure block (605) that matches the top of the valve stem (5). Pressing the upper handle (604) downwards can squeeze the valve stem (5) through the pressure block (605), causing the valve stem (5) to move downwards.

3. The valve structure of a low-temperature antifreeze foam fire extinguisher according to claim 2, characterized in that: The lower handle (603) and the upper handle (604) are provided with matching sockets. The lower handle (603) and the upper handle (604) are fixed by inserting a pin (606) into the socket. The outer end of the pin (606) is connected to a pull rope (607), and one end of the pull rope (607) is fixed to the lower handle (603).

4. The valve structure of a low-temperature antifreeze foam fire extinguisher according to claim 3, characterized in that: The power supply module includes a control board (10) and a battery pack (11) disposed inside the housing, a switch (12) mounted on the housing, and a connecting channel (13) provided in the valve stem (5) and valve core (7). The housing (9) and the annular groove are connected through the channel (13). The control board (10), battery pack (11), switch (12), and heating film (8) form a closed circuit through wires. A battery cover (14) is fastened to the end of the housing (9).

5. The valve structure of a low-temperature antifreeze foam fire extinguisher according to claim 4, characterized in that: The valve body (1) has a first external thread on the outer wall of the inlet end and a first sealing ring (15) on the outer wall of the inlet end; the valve body (1) has a second external thread on the outer wall of the outlet end and a second sealing ring (16) on the outer wall of the outlet end.

6. The valve structure of a low-temperature antifreeze foam fire extinguisher according to claim 5, characterized in that: The top of the inlet (2) and the top of the valve core (7) are both conical, and there are mutually cooperating steps on the two conical surfaces. A third sealing ring (17) is provided on both the horizontal and vertical surfaces of the steps.

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