Fire detection tube used for automatic fire extinguishing device and the automatic fire extinguishing device

Abstract

The present invention provides an automatic fire extinguishing device that can detect a fire at the temperature lower than 120 degrees Celsius and that can be installed for a long term in a state of maintenance-free. The fire extinguishing device consists of a pressure resistant container filled with the extinguishant and the pressurization agent, the container valve attached to the opening of the pressure resistant container, the fire detection tube connected to the container valve. And the fire detection tube is formed with the lamination of the tubular base resin layer and the gas barrier layer, the base resin layer is made of the thermoplastic resin and the gas barrier layer is made of ethylene vinyl alcohol copolymer resin (EVOH resin).

Claims

1. An automatic fire extinguishing device is characterized in that it contains a pressure resistant container which includes an extinguishant and a pressurization agent inside, a container valve attached to an opening of the pressure resistant container, a fire detection tube connected to the container valve, the fire detection tube equipped with a tubular base layer and a gas barrier layer laminated coaxially with the tubular base resin layer, the tubular base resin layer which is comprising thermoplastic resin, the gas barrier layer consisting of ethylene-vinyl alcohol copolymer resin (EVOH resin), wherein a thickness of the gas barrier layer is within a range from 0.005 mm to 0.1 mm and a thickness of the tubular base resin layer is within a range from 1 mm to 2 mm.

2. The automatic fire extinguishing device described in claim 1 characterized by the gas barrier layer being sandwiched by the tubular base resin layer, or the gas barrier layer being laminated on one side of the tubular base resin layer.

3. The automatic fire extinguishing device described in claim 1 characterized by the gas barrier layer and the tubular base resin layer being laminated through adhesive layers.

4. A fire detection tube of an automatic fire extinguishing device characterized in that it contains a tubular shaped base resin layer and a gas barrier layer laminated coaxially with the tubular shaped base resin layer, the tubular shaped base resin layer consisting of thermoplastic resin, the gas barrier layer consisting of EVOH resin, wherein a thickness of the gas barrier layer is within a range from 0.005 mm to 0.1 mm and a thickness of the tubular shaped base resin layer is within a range from 1 mm to 2 mm.

5. The fire detection tube of the automatic fire extinguishing device described in claim 4 characterized by the gas barrier layer being sandwiched by the tubular shaped base resin layer or the gas barrier layer being laminated on one side of the tubular shaped base resin layer.

6. The fire detection tube of the automatic fire extinguishing device described in claim 4, characterized by the gas barrier layer and the tubular shaped base resin layer being laminated through an adhesive layer.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) FIG. 1 is an illustration indicating the cross sectional structures of the fire detection tube for the automatic fire extinguishing devices of the present invention.

(2) FIG. 2 is temperature of the inside of the heating apparatus and a graph indicating relations with the time.

(3) FIG. 3 is a graph indicating the changes of the internal pressure of the fire detection tube having the barrier layer consisting of the various synthetic resins.

(4) FIG. 4 is a graph indicating the changes of the internal pressure of the fire detection tube having the barrier layer consisting of the EVOH resin having different thickness.

(5) FIG. 5 is an illustration indicating the setting example of the automatic fire extinguishing device of the direct system.

(6) FIG. 6 is an illustration indicating the setting example of the automatic fire extinguishing device of the indirect system.

BEST MODE FOR CARRYING OUT THE INVENTION

(7) We achieved the purpose of providing the fire detection tube being good at the fire responsiveness of the activation temperature being lower than 120 degrees Celsius and of providing the automatic fire extinguishing device using this fire detection tube by the simple structure without losing the gas barrier capacity.

Embodiment 1

(8) (1) An Experiment that Supports the Fact that the Fire Detection Tube of the Present Invention is Able to Rupture and to Extinguish a Fire at the Temperature of Lower than 120 Degrees Celsius

(9) (A) the Fire Detection Tube Used for the Experiment

(10) The fire detection tubes used for the experiment are the testing specimen 14. As for the testing specimen 14, the inside diameter is 4 mm, the outer diameter is 6 mm and the full length is 2000 mm. Nitrogen gas (N2) is filled with the inside of the testing specimen 14, and the both ends of the testing specimen 14 are sealed by the thermo compression. And the internal pressure of the testing specimen 14 is 1.8 Mpa.

(11) As indicated on FIG. 1, as for the testing specimen 1 and 2, the lamination which is laminated the both sides of the gas barrier layer 18 made of the EVOH resin with the base resin layer 22 made of the PE resin through the adhesive layer 20 is used. As for the material of the adhesive layer 20, Polyolefin resin denaturalized by the functional group such as maleic anhydride is used. The thickness of the gas barrier layer 18 is 0.005 mm. As for the material of the testing specimen 3 and 4, PA resin is used as a whole.

(12) (B) The Heating Apparatus Used for the Experiment Name of the Maker: Kato Inc. Name of the Product: Silvery Emperor Type of the Model: SSE-45K-A

(13) (C) The Conditions of the Experiment

(14) The ruptured temperature and the duration time are examined by the conditions of the testing specimen 14 in the heating apparatus being heated by 3 degrees Celsius/min from the temperature of 24 degrees Celsius. The upper limit of the heating temperature is 190 degrees Celsius.

(15) (D) The Result of the Experiment

(16) The result of the experiment is indicated on Table 1 and FIG. 2.

(17) TABLE-US-00001 TABLE 1 Testing Quantity of Operation Specimen Pressurization(Mpa) Temperature( C.) Operation Time 1 1.8 92 18 min. 50 sec. 2 1.8 92 18 min. 50 sec. 3 1.8 179 48 min. 30 sec. 4 1.8 179 48 min. 40 sec.

(18) The rupturing temperature of the fire detection tube of the testing specimen 3 and 4 at the embodiment 1 is around 90 degrees Celsius whereas the explosion temperature of the fire detection tube of the testing specimen 1 and 2 at embodiment 1 is around 180 degrees Celsius. Therefore it is proved that the fire detecting tube of the embodiment can be activated immediately at the temperature of lower than 120 degrees Celsius.

(19) (2) The Inspection of the Fact Having the Sufficient Gas Barrier Property of the Fire Detection Tube of the Present Invention

(20) Using various kinds of materials for the gas barrier layer and putting the pressure to the inside of the fire detection tube consisting of these gas barrier layer by the nitrogen gas, we tried to obtain the relationship between the pressure inside of the fire detection tube and the lapsing time (years). As for the fire detecting tube, the length is 10 m, the central diameter of the tube is 5 mm, surface area of the tube is 157079.6 mm2/10 m, the inner diameter of the tube is 4 mm and the content volume (inner capacity) is 125663.7 mm3/10 m. The pressure of the inside of the fire detection tube is 1.8 MPa.

(21) As for the materials of the gas barrier layer, EVOH resin, PET resin, PAN resin and PVDC resin are used. The thickness of the gas barrier layer consisting of EVOH resin is 0.005 mm. The thickness of the gas barrier layer consisting of PET resin, the gas barrier layer consisting of PAN resin and the gas barrier layer consisting of PVCD resin are 0.1 mm all. For the comparison example the fire detection tube consisting of PA resin (thickness is 1 mm) is also used.

(22) As for the nitrogen permeability rate, EVOH resin is 0.017 cc.Math.20 m/(m.sup.2.Math.day.Math.atm), PET resin is 8 cc.Math.20 m/(m.sup.2.Math.day.Math.atm), PAN resin is 5 cc.Math.20 m/(m.sup.2.Math.day.Math.atm), PVDC resin is 6 cc.Math.20 m/(m.sup.2.Math.day.Math.atm) and PA resin is 12 cc.Math.20 m.Math.(m.sup.2.Math.day.Math.atm).

(23) Trying to obtain a relationship between the pressure of the inside of the fire detection tube and the lapse of the years under the conditions above, the result is shown as FIG. 3. The result indicated on FIG. 3 shows that the fall of the pressure of the fire detection tube which laminated the gas barrier layer consisting of the EVOH resin is lower for a long time than the fall of the pressure of the fire detection tube which laminated the gas barrier layer consisting of the PET resin, PAN resin or PVDC resin. And in comparison with decline of the pressure of the fire detection tube consisting of the polyamide resin, the decline of the pressure of the fire detecting tube laminated the gas barrier layer consisting of the EVOH resin is less for a long time is found.

(24) (3) The Relationship Between the Thickness and the Inner Pressure of the Gas Barrier Layer Consisting of EVOH Resin

(25) After trying to obtain a relationship between the lapse of time (years) and the inner pressure of the gas barrier layer consisting of the EVOH resin by changing the thickness of the gas barrier layer consisting of the EVOH resin gradually from 0.002 mm, 0.005 mm, 0.02 mm to 0.1 mm, then the result is as indicated on FIG. 4.

(26) According to the result indicated on FIG. 4, it is preferable that the range of the thickness of the gas barrier layer is between 0.005 mm and 0.02 mm because if the thickness of the gas barrier layer is between 0.005 mm and 0.02 mm, the fall of the inner pressure is small. However, even if the range of the thickness of the gas barrier layer is less than 0.005 mm, it can be used depending on the condition because when the range of the thickness of the gas barrier layer is between 0.005 and 0.002 mm, the fall of the internal pressure is smaller than that of the fire detection tube consisting of the PA resin.

(27) In addition, at the above embodiment example the fire detection tube of which outer diameter is 6 mm, the inner diameter is 4 mm and the thickness of the gas barrier layer is 0.0020.1 mm, is used. But as for the fire detection tube, if the tube is too thick or the thickness of the gas barrier layer is too big, it is difficult to install it in the small space such as the inside of the engine room of the car or the switchboard. Therefore the inner and outer diameters of the fire detection tube and the thickness of the gas barrier layer should be designed properly based on the above viewpoints.

Embodiment 2

(28) At the above embodiment 1, the EVOH resin was used as the material of the gas barrier layer, but the permeance experiment was done by making a fire detection tube using the aluminum film as the gas barrier layer instead of the EVOH resin because the transmissivity of the pressurization gas (nitrogen gas) of the aluminum film is so low that it might be said it is nearly zero in comparison with the EVOH resin. And the same result as the experiment of the embodiment 1 using the fire detection tube is obtained.

INDUSTRIAL APPLICABILITY OF THE INVENTION

(29) The present invention of this automatic fire extinguishing device is applicable to use not only to extinguish a fire caused by a lithium ion battery installed in the car but also to extinguish a fire of the switchboard, the distribution board, the electricity board, the server rack, the dust collector, the NC lathe, the grinder, various machine tools, the storage of inflammables, the chemical experimental device, the fireproof safekeeping, the important documents library, oil storehouse et al.

EXPLANATION OF THE MARK

(30) 10: PRESSURE RESISTANT CONTAINER 12: CONTAINER VALVE 14: FIRE DETECTION TUBE 16: PRESSURE GAUGE 18: GAS BARRIER LAYER 20: ADHESIVE LAYER 22: BASE RESIN LAYER