JPS584505Y2 - Pressurized fire extinguisher - Google Patents

Description

[Detailed description of the invention] The present invention is a pressurized fire extinguisher, more specifically, a fire extinguisher body containing a powder extinguishing agent and a high-pressure gas cylinder has a cap attached to the opening to close the opening, and is supported by the cap. The present invention relates to a pressurized fire extinguisher in which the sealing plate of the cylinder is broken by the operation of a breaking shaft, and the powder fire extinguishing agent is ejected from the nozzle to the outside.

Normally, with this type of fire extinguisher, the seal of the cylinder is broken while the powder extinguishing agent filled in the fire extinguisher body is moist and solidified, and the high-pressure gas in the cylinder enters the fire extinguisher body. Regardless of whether it has leaked, the solidified powder extinguishing agent may prevent the high-pressure gas inside the main body from being discharged from the nozzle, or the powder may mix with the extinguishing agent while it is being emitted from the nozzle and extinguish the fire. The pressure inside the main body may not be able to be discharged from the nozzle due to foreign matter inside the main body becoming clogged. Therefore, a pressure relief valve is attached to the mouthpiece, and by operating the pressure relief valve, the pressure inside the main body may be removed. The high pressure is exhausted to the outside.

However, this conventional fire extinguisher requires a special exhaust pressure valve, so it has a large number of parts and a complicated structure, which makes processing and assembly troublesome, requiring a lot of effort, and is very costly. Moreover, since the special exhaust pressure valve is provided, the base for supporting the valve is not only large in size but also heavy.

The present invention was devised in view of the above-mentioned drawbacks of the conventional technology.
The objective is to provide a pressurized fire extinguisher that can easily and safely release pressure while eliminating the need for a special pressure release valve.

Therefore, the present invention provides a mounting tube at the opening of the fire extinguisher body that houses a powder extinguishing agent and a high-pressure gas cylinder, and the inner circumferential surface of the mounting tube and the outer circumferential surface of the cap that closes the opening. a threaded portion is formed in each of the caps, and the threaded portion of the cap is screwed into the threaded portion of the mounting tube to attach the cap to the mounting tube; and a sealing member is interposed between the receiving stage and the outer end surface of the mounting tube, and one of the threaded portions is opened into the fire extinguisher main body. Decompression groove,
The screw thread of the threaded portion is formed by cutting in the pitch direction, and the pressure reducing groove is opened to the outside by rotation of the cap in the loosening direction.

Embodiments of the present invention will be described below based on the drawings.

In the figure, 1 is a bottomed cylindrical fire extinguisher main body with an open upper end, and 2 is a cap for closing the opening of the main body 1. Axis 3
is supported movably up and down, and the opening is sealed with a sealing plate 4.
Attach the high pressure gas cylinder 4 that was closed in step 1 by screwing,
The sealing plate 41 is broken by moving the breaking shaft 3 downward, and the main body 1 is further broken through the gas release pipe 5.
A gas discharge path 21 opening at the bottom of the interior and a siphon tube 6
a drug release path 22 that opens to the bottom of the main body 1 through the
and a nozzle 7 is provided at the outlet of the drug release path 22.

The mounting tube 8 is attached to the opening of the fire extinguisher main body 1 by welding, and the inner circumferential surface of the attachment tube 8 and the base 2 are connected to each other by welding.
forming threaded portions 81 and 23 on the lower outer circumferential surface of the
The threaded portion 23 of the cap 2 is screwed into the serration portion 81 of the mounting tube 8 to attach the cap 2 to the mounting tube 8, and the outer end surface 82 of the mounting tube 8 is attached to the outer peripheral surface of the cap 2. An annular receiving stage 24 is formed opposite to the cylinder 4, and an annular sealing member 9 is interposed between the receiving plate 24 and the outer end surface 82, and the cylinder 4 is introduced into the fire extinguisher main body 1. This prevents the high-pressure gas generated from leaking to the outside from the attachment portion of the base 2 to the attachment tube 8.

Further, a pressure reducing groove 10 that opens into the fire extinguisher main body 1 is formed in the threaded portion 23 of the cap 2 by cutting off all the threads in the threaded portion 23 in the pitch direction, so that the cap 2 can be tightened. The outlet of the pressure reducing groove 10 is connected to the seal member 9 by
The outlet of the pressure reducing groove 10 is opened to the outside by rotating the mouthpiece 2 in the loosening direction, so that the pressure inside the fire extinguisher body 1 is actively exhausted to the outside from the pressure reducing groove 10. It is.

This pressure reducing groove 10 has a depth of 5 m/m and a width of 10 mm/m, and is formed in a cross-sectional shape. A passage is provided between 23° and 81 which is significantly larger than the clearance length between these threaded parts 23 and 81, so that when the cap 2 is rotated in the loosening direction,
The opening amount of the pressure reducing groove 10 is gradually increased within the range of the passage cross-sectional area of the pressure reducing groove 10, so that the high pressure inside the fire extinguisher body 1 is gradually exhausted to □, and the threaded portion 23, 4 threads (the length of the threaded part 23 is approximately 8 m/I)
II), and as a result of an experiment with the pressure reducing groove 10 formed to the above-mentioned size, the maximum internal pressure inside the fire extinguisher body 1 was 11 kg.
/Cm2, by rotating the cap 2 once, the internal pressure inside the fire extinguisher main body 1 decreased to a pressure close to atmospheric pressure.

Further, in the pressure reducing groove 10, a gas release pipe fixing fitting 1 is provided.
1. For example, a mounting hole 12 for a set screw or rivet is provided, and the gas discharge pipe 5 is mounted to the base 2 by fitting the mounting tool 11 into the mounting hole 12.

In addition, 13 in the figure is a fixed lever attached to the top surface of the base 2;
Reference numeral 4 denotes a starting lever pivotably supported on this lever 13, and by operating this starting lever 14, the breaking shaft 3 is moved up and down.

Further, 15 is a lever support for the activation lever 14, and 16 is a safety pin that prevents the lever support 15 from rotating.

The present invention is constructed as described above, and when it is used, first the safety pin 16 is removed to release the rotation prevention of the lever support 15, and then the activation lever 14 is actuated so that the destruction shaft 3 is moved downward. Move high pressure gas cylinder 4
The sealing plate 41 of the cylinder 4 is broken, and the high-pressure gas in the cylinder 4 flows out from the gas discharge path 21 to the bottom of the fire extinguisher body 1 through the gas discharge pipe 5, and this high-pressure gas causes the inside of the fire extinguisher body 1 to The internal pressure immediately rises, and the powder extinguishing agent inside the main body 1
The drug is emitted from the nozzle 7 via the siphon tube 6 and the drug release path 22 to the outside.

Moreover, the sealing plate 41 of the cylinder 4 is broken while the powder extinguishing agent in the fire extinguisher main body 1 is moist and solidified.
When the high pressure gas in the main body 1 cannot be discharged from the nozzle 7 due to the solidified powder extinguishing agent even though the high pressure gas in the cylinder 4 has leaked into the fire extinguisher body 1, or when the powder extinguishing agent is not discharged from the nozzle. During the discharge from 7, the nozzle 7 may be clogged with foreign matter that was mixed with the powder extinguishing agent and entered the fire extinguisher body 1, and the high pressure inside the body 1 is discharged from the nozzle 7. If pressure cannot be released,
The mouthpiece 2 is loosened to open the pressure reducing groove 10 to the outside, and the high pressure inside the fire extinguisher main body 1 is actively exhausted to the outside from the pressure reducing groove 10.

However, when the cap 2 is loosened, a gap is created between the receiving stage 24 of the cap 2, which had been closed by the sealing member 9, and the outer end surface 82 of the mounting tube 8, and the reduced pressure is passed through this gap. The groove 10 is opened to the outside.

Then, as the cap 2 rotates in the loosening direction,
The opening amount of the pressure reducing groove 10 gradually increases within the range of the passage cross-sectional area of the pressure reducing groove 10, and while the mouthpiece 2 rotates once, the high pressure inside the fire extinguisher body 1 is released from the pressure reducing groove 10 to the outside. The pressure inside the fire extinguisher body 1 becomes almost atmospheric pressure.

Therefore, when the cap 2 comes off from the mounting tube 8, there is no risk that the high pressure inside the fire extinguisher body 1 will blow out all at once and cause harm to the operator, and the cap 2 can be loosened with peace of mind. It is.

Moreover, since the mounting hole 12 for the gas discharge tube fixing fixture 11 is provided in the decompression groove 10, the threaded portion 23 is formed by the mounting hole 12 regardless of whether the threaded portion 23 is provided on the outer periphery of the cap 2.
3 can be prevented from being damaged, and in addition, the above-mentioned mounting hole 1
2 can be easily formed.

In the above embodiment, the threaded portion 23 of the cap 2 is provided with the pressure reducing groove 1.
0 is provided, but there are other mounting tubes with 8
A depressurizing groove 10 may be provided in the threaded portion 81 of.

As described above, the present invention provides a mounting tube at the opening of the fire extinguisher main body, a threaded portion on the inner peripheral surface of the mounting tube and an outer peripheral surface of the cap that closes the opening, and The cap is screwed onto the mounting tube, and the cap is provided with a receiving stage facing the outer end surface of the mounting tube, and a sealing member is provided between the receiving step and the outer end surface of the mounting tube. a decompression groove that opens into the fire extinguisher main body is formed in one of the threaded parts by cutting out the threads of the threaded part in the pitch direction;
Since the pressure reducing groove is opened to the outside by rotating the cap in the direction of loosening, a special pressure reducing valve is not required, and the pressure can be discharged with a simple operation of loosening the cap. This makes it possible to exhaust pressure extremely safely.

Furthermore, since a pressure-reducing groove is simply provided in the threaded part for attaching the cap, the number of parts can be reduced and the structure can be simplified, making processing and assembly easier compared to conventional systems that provide a special pressure-reduction valve. It's easy to do.

Therefore, it is possible to significantly reduce costs.

Moreover, although a special exhaust pressure valve is not required, the base can be made particularly small and lightweight.

[Brief explanation of the drawing]

FIG. 1 is a partially omitted vertical sectional view showing an embodiment of the present invention, FIG. 2 is a perspective view of the base portion, and FIG. 3 is an enlarged sectional view of the main part. 1... Fire extinguisher body, 2... Cap, 23
...Threaded part, 24 ... Reception stage, 8 ...
...Mounting tube, 81...Threaded part, 9...
... Seal member, 10... Pressure reduction groove.

Claims (1)

[Scope of utility model registration request] A mounting tube is provided at the opening of the fire extinguisher body containing a powder extinguishing agent and a high-pressure gas cylinder, and threaded portions are formed on the inner peripheral surface of the mounting tube and the outer peripheral surface of a cap that closes the opening. , the threaded portion of the cap is screwed into the threaded portion of the mounting tube to attach the cap to the mounting tube;
A receiving step facing the outer end surface of the mounting tube is formed on the cap, and a sealing member is interposed between the receiving step and the outer end surface of the mounting tube. A depressurizing groove that opens inside the fire extinguisher body is shaped by cutting out the threads of the threaded portion in the pitch direction, and by rotating the cap in the loosening direction, the depressurizing groove is exposed to the outside. A pressurized fire extinguisher characterized by the fact that it opens as if it were released.