Piston type dry powder fire extinguisher

Abstract

The invention relates to a fire extinguisher in the field of fire-fighting equipment, in particular to a piston type dry powder fire extinguisher which comprises a barrel (8), a barrel connector (9), a one-way air valve (13) and a spray pipe, a plurality of barrel limiting bosses (4) are arranged in the barrel (8) and make contact with the bottom end of a piston (5), and the space between the front end of the piston (5) and the one-way air valve (13) is filled with a dry powder extinguishing agent (7). When the fire extinguisher is used, a firefighter holds the barrel body (8) with one hand, holds the pressing handle (12) on the one-way air valve (13) with the other hand, aligns the spraying pipe to the root of a fire source, the hand holding the pressing handle (12) forcibly presses down to open the one-way air valve (13), and pressure gas sprays the dry powder extinguishing agent (7) to the root of the fire source from the spraying pipe to extinguish the fire. The dry powder extinguishing agent (7) can be completely sprayed out, and waste of the dry powder extinguishing agent (7) is avoided.

Description

Technical Field

[0001] The invention relates to a fire extinguisher in the field of fire fighting equipment, in particular to a piston type dry powder fire extinguisher. Background Art

[0002] Dry powder fire extinguisher is a commonly used fire extinguishing equipment. The commonly used portable dry powder fire extinguisher adopts a siphon structure, and its dry powder fire extinguishing agent spray rate is about 91%; another kind of grip-type dry powder fire extinguisher adopts a small tube diameter direct spray method. Through experiments, its spray rate is also about 91%. Therefore, the existing dry powder fire extinguishers have a common defect, that is, the dry powder fire extinguishing agent cannot be completely sprayed out. About 8% of the dry powder fire extinguishing agent remains in the fire extinguisher cylinder, resulting in a waste of dry powder fire extinguishing agent. Summary of the invention

[0003] The invention aims to solve the problem that the dry powder fire extinguishing agent in the dry powder fire extinguisher cannot be completely sprayed out, resulting in waste of the dry powder fire extinguishing agent.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a piston-type dry powder fire extinguisher, comprising an inflation valve, a cylinder, a cylinder connector, a one-way air valve, and a nozzle, wherein the tail end of the cylinder is fixedly connected to the inflation valve by a thread, the front end of the cylinder is fixedly connected to the cylinder connector by welding, the cylinder connector is fixedly connected to the air inlet of the one-way air valve by a thread, and the air outlet of the one-way air valve is fixedly connected to the nozzle by a thread, a plurality of cylinder limiting bosses are arranged in the cylinder, a piston is arranged between the cylinder limiting bosses and the cylinder connector, the bottom end of the piston is in contact with the plurality of cylinder limiting bosses, dry powder fire extinguishing agent is filled between the front end of the piston and the one-way air valve, a through hole is arranged in the middle of the piston, a one-way valve is clamped in the through hole, wherein the air inlet of the one-way valve is connected to the tail end of the cylinder, and the air outlet of the one-way valve is in contact with the dry powder fire extinguishing agent in the cylinder.

[0005] Furthermore, the tail end of the inflation valve is fixedly connected to a pressure gauge via threads, and the pressure gauge is in communication with the pressure gas at the tail end of the cylinder.

[0006] Furthermore, a protective cover is provided on the periphery of the inflation valve, and the protective cover is fixedly connected to the tail end of the cylinder by welding. A process hole is provided on the protective cover to facilitate inflation of the inflation valve.

[0007] Furthermore, the one-way air valve is hinged to the pressing handle via a hinge shaft, and a safety pin is inserted into corresponding positions of the one-way air valve and the pressing handle.

[0008] Furthermore, there are two cylinder limiting bosses provided in the cylinder, and they are symmetrically arranged on the same circular cross-section of the inner wall of the cylinder.

[0009] Furthermore, the nozzle is a telescopic nozzle fixedly connected to the air outlet of the one-way air valve.

[0010] Furthermore, the nozzle is a long-rod nozzle fixedly connected to the air outlet of the one-way air valve.

[0011] Beneficial effects of the present invention: Compared with the prior art, the piston-type dry powder fire extinguisher of the present invention has a spray rate of dry powder fire extinguishing agent of more than 99% under the same pressure and volume as the prior art. The dry powder fire extinguishing agent can be completely sprayed out under the push of the piston, avoiding the waste of dry powder fire extinguishing agent. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic cross-sectional structure diagram of a piston-type dry powder fire extinguisher of the present invention; Figure 2 yes Figure 1 Left view of Figure 3 It is a schematic cross-sectional structure diagram of a piston-type dry powder fire extinguisher of the present invention when spraying is completed; Figure 4 The present invention is a schematic diagram of the cross-sectional structure of a piston-type dry powder fire extinguisher equipped with a long-rod nozzle.

[0013] As shown in the figure: 1-air pressure gauge, 2-protective cover, 3-inflating valve, 4-cylinder limiting boss, 5-piston, 6-check valve, 7-dry powder fire extinguishing agent, 8-cylinder, 9-cylinder connecting head, 10-safety pin, 11-hinge shaft, 12-pressing handle, 13-check valve, 14-telescopic nozzle, 15-long rod nozzle. DETAILED DESCRIPTION

[0014] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0015] like Figures 1 to 3 As shown, a piston-type dry powder fire extinguisher comprises an air charging valve 3, a cylinder 8, a cylinder connector 9, a one-way air valve 13, and a nozzle, wherein the rear end of the cylinder 8 is fixedly connected to the air charging valve 3 by threads, the front end of the cylinder 8 is fixedly connected to the cylinder connector 9 by welding, the cylinder connector 9 is fixedly connected to the air inlet of the one-way air valve 13 by threads, and the air outlet of the one-way air valve 13 is fixedly connected to the nozzle by threads, a plurality of cylinder limiting bosses 4 are arranged in the cylinder 8, a piston 5 is arranged between the cylinder limiting bosses 4 and the cylinder connector 9, the bottom end of the piston 5 contacts the plurality of cylinder limiting bosses 4, a dry powder fire extinguishing agent 7 is filled between the front end of the piston 5 and the one-way air valve 13, a through hole is arranged in the middle of the piston 5, a one-way valve 6 is clamped in the through hole, wherein the air inlet of the one-way valve 6 is communicated with the rear end of the cylinder 8, and the air outlet of the one-way valve 6 contacts the dry powder fire extinguishing agent 7 in the cylinder 8; In this embodiment, the function of the one-way valve 6 is to prevent the dry powder fire extinguishing agent 7 from entering the rear end of the cylinder 8, and at the same time ensure that the pressure gas in the cylinder 8 can only enter the dry powder fire extinguishing agent 7 through the one-way valve 6, so that the pressure gas sprays the dry powder fire extinguishing agent 7 out of the nozzle. This structure avoids the defect that the portable fire extinguisher uses a siphon method to extract the dry powder fire extinguishing agent 7. When using the piston-type dry powder fire extinguisher of the present invention, the height and direction of the nozzle can be adjusted arbitrarily, and the long rod-shaped nozzle can directly reach the root of the fire source to spray the dry powder fire extinguishing agent 7, so the fire extinguishing efficiency is high and the speed is fast, and a large amount of dry powder fire extinguishing agent 7 can be saved; In this embodiment, the function of the piston 5 is to push the dry powder fire extinguishing agent 7 to move in the direction of the nozzle through the pressure of the compressed air at the rear of the cylinder 8 until the dry powder fire extinguishing agent 7 is completely sprayed out. At this time, the piston 5 also moves to the air inlet position of the one-way air valve 13. Therefore, when the piston-type dry powder fire extinguisher of the present invention is used for fire extinguishing, under the same pressure and volume as the prior art, the spray rate of the dry powder fire extinguishing agent 7 is approximately above 99%, thereby avoiding the waste of the dry powder fire extinguishing agent 7.

[0016] like Figure 1 As shown, the tail end of the inflation valve 3 is fixedly connected to a barometer 1 by a thread, and the barometer 1 is connected to the pressure gas at the tail end of the cylinder 8; in this embodiment, the function of the barometer 1 is to display the pressure of the pressure gas in the cylinder 8.

[0017] like Figure 1 As shown, there is a protective cover 2 around the inflation valve 3, and the protective cover 2 is fixedly connected to the tail end of the cylinder 8 by welding. A process hole is opened on the protective cover 2 to facilitate the inflation of the inflation valve 3. In this embodiment, the function of the inflation valve 3 is to fill the pressurized gas into the cylinder 8. If the pressure of the pressurized gas in the cylinder 8 is too high, the pressure can also be released through the inflation valve 3.

[0018] like Figure 1 to Figure 2 As shown, the one-way air valve 13 is hinged to the pressure handle 12 through a hinge shaft 11, and a safety pin 10 is inserted into the corresponding positions of the one-way air valve 13 and the pressure handle 12; in this embodiment, only when the safety pin 10 is pulled out, the pressure handle 12 can open the one-way air valve 13, so that the pressurized gas can spray the dry powder fire extinguishing agent 7 out of the nozzle.

[0019] like Figure 1 As shown, there are two cylinder limiting bosses 4 provided in the cylinder 8, and they are symmetrically arranged on the same circular cross-section of the inner wall of the cylinder 8; in this embodiment, the two cylinder limiting bosses 4 are symmetrically arranged on the same circular cross-section of the inner wall of the cylinder 8, and their function is to limit the position of the piston 5 in the cylinder 8.

[0020] like Figure 1As shown, the nozzle is a telescopic nozzle 14 fixedly connected to the air outlet of the one-way air valve 13; like Figure 4 As shown, the nozzle is a long-rod nozzle 15 fixedly connected to the air outlet of the one-way air valve 13; In this embodiment, for a fire extinguisher loaded with about 7 kilograms of dry powder fire extinguishing agent, because the dosage of the fire extinguishing agent is small and the spraying time is short, the nozzle of the piston-type dry powder fire extinguisher adopts a long rod nozzle 15; for a fire extinguishing agent with a large dosage, a long spraying time, and a long spraying distance requirement, the nozzle of the piston-type dry powder fire extinguisher adopts a telescopic nozzle 14.

[0021] In addition, the inflation valve 3, the one-way valve 6, and the one-way air valve 13 described in the present invention are all mature existing technologies, and the present invention does not describe their structures in detail.

[0022] The specific working principle of the present invention is: Check the pressure gauge 1 before use. If the pressure value of the pressure gauge 1 is within the specified range, it means that the fire extinguisher can be used normally. When using a fire extinguisher, first pull out the safety pin 10, the firefighter holds the cylinder 8 with one hand, holds the pressure handle 12 on the one-way air valve 13 with the other hand, aims the nozzle at the root of the fire source, and presses down with the hand holding the pressure handle 12 to open the one-way air valve 13; After the one-way air valve 13 is opened, the pressure gas at the tail end of the cylinder 8 causes the piston 5 to push the dry powder fire extinguishing agent 7 to move in the direction of the nozzle. At the same time, the pressure gas at the tail end of the cylinder 8 enters the dry powder fire extinguishing agent 7 through the one-way valve 6. The pressure gas drives the dry powder fire extinguishing agent 7 to be ejected from the nozzle through the one-way air valve 13. The ejected dry powder fire extinguishing agent 7 covers the root of the fire source, isolates the air around the fire source and completes the fire extinguishing task.

[0023] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any simple modification, equivalent replacement, improvement, etc. made within the technical concept of the present invention should be included in the protection scope of the present invention.

Claims

1. A piston-type dry powder fire extinguisher, comprising an air filling valve (3), a cylinder (8), a cylinder connector (9), a one-way air valve (13), and a nozzle, wherein the rear end of the cylinder (8) is fixedly connected to the air filling valve (3) by means of a thread, the front end of the cylinder (8) is fixedly connected to the cylinder connector (9) by means of welding, the cylinder connector (9) is fixedly connected to the air inlet of the one-way air valve (13) by means of a thread, and the air outlet of the one-way air valve (13) is fixedly connected to the nozzle by means of a thread, characterized in that: A plurality of cylinder limiting bosses (4) are provided in the cylinder (8), a piston (5) is provided between the cylinder limiting bosses (4) and the cylinder connecting head (9), the bottom end of the piston (5) contacts the plurality of cylinder limiting bosses (4), a dry powder fire extinguishing agent (7) is filled between the front end of the piston (5) and the one-way air valve (13), a through hole is provided in the middle of the piston (5), a one-way valve (6) is clamped in the through hole, an air inlet of the one-way valve (6) is connected to the rear end of the cylinder (8), and an air outlet of the one-way valve (6) contacts the dry powder fire extinguishing agent (7) in the cylinder (8).

2. A piston-type dry powder fire extinguisher according to claim 1, characterized in that: The tail end of the inflation valve (3) is fixedly connected to a pressure gauge (1) via a thread, and the pressure gauge (1) is in communication with the pressure gas at the tail end of the cylinder (8).

3. A piston-type dry powder fire extinguisher according to claim 2, characterized in that: The inflation valve (3) is provided with a protective cover (2) on its periphery. The protective cover (2) is fixedly connected to the rear end of the cylinder (8) by welding. A process hole is provided on the protective cover (2) to facilitate inflation of the inflation valve (3).

4. A piston-type dry powder fire extinguisher according to claim 3, characterized in that: The one-way air valve (13) is hingedly connected to the pressing handle (12) via a hinge shaft (11), and a safety pin (10) is inserted into corresponding positions of the one-way air valve (13) and the pressing handle (12).

5. A piston-type dry powder fire extinguisher according to claim 4, characterized in that: There are two cylinder limiting bosses (4) provided in the cylinder (8), and they are symmetrically arranged on the same circular cross-section of the inner wall of the cylinder (8).

6. A piston-type dry powder fire extinguisher according to claim 1, characterized in that: The nozzle is a telescopic nozzle (14) fixedly connected to the air outlet of the one-way air valve (13).

7. A piston-type dry powder fire extinguisher according to claim 1, characterized in that: The nozzle is a long-rod nozzle (15) fixedly connected to the air outlet of the one-way air valve (13).

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