JP2014079633A - Fire extinguishing gas jetting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fire extinguishing gas injection device capable of reducing an injection reaction force generated by injection of a fire extinguishing gas and quickly filling the entire target fire extinguishing target space.
A guide member 39 is constituted by a peripheral wall 38 and an end plate 41, and a guide member having a gas guide surface 37 facing a nozzle hole 35 of a nozzle member 36 having a pressure receiving plate 50 from the outside of the nozzle member 36. 39 is attached to the attachment portion 34 of the conduit 32 to disperse the jet flow of the fire extinguishing gas ejected from the nozzle hole 35, thereby reducing the injection reaction force R caused by the fire extinguishing gas injection.
[Selection] Figure 1

Description

  The present invention relates to a fire extinguishing gas injection device for a gas fire extinguishing equipment that extinguishes fire by releasing a fire extinguishing gas such as N2 gas or a halide gas as a fire extinguishing agent into a fire extinguishing target space of a building when a fire breaks out. The present invention relates to a fire-extinguishing gas injection device that can reduce a reaction force to a fire-extinguishing gas conduit that is generated when it is injected.

  Conventionally, various buildings are equipped with gas fire extinguishing equipment that discharges fire extinguishing gas such as CO2 gas, N2 gas, and halides as fire extinguishing agents into a fire extinguishing target section.

  FIG. 9 is a perspective view showing a fire extinguishing gas injection unit 1 including a fire extinguishing gas injection device of the prior art. The fire extinguishing gas injection unit 1 includes an injection head 3 as a fire extinguishing gas injection device that injects a high-pressure fire extinguishing gas supplied from a fire extinguishing gas supply source 15 when a fire occurs, and a conduit 4 to which the injection head 3 is connected.

  The conduit 4 is connected to the main pipe 5 connected to the fire extinguishing gas supply source 15, the branch pipe 6 interposed in the main pipe 5, and the fire extinguishing gas from the main pipe 5 is guided by the branch pipe 6, and the jet head 3 is connected. And a branch pipe 7. The main pipe 5 is installed in a state of being fastened by a fastener 10 such as a U-bolt to a building housing or a base 8 fixed to the housing (see, for example, Patent Document 1).

  FIG. 10 is an enlarged cross-sectional view showing the internal structure of the ejection head 3. The jet head 3 has a mounting portion 12 that opens toward the fire extinguishing target space 11 of the branch pipe 7, and a nozzle hole that is screwed to the mounting portion 12 and jets a high-pressure fire extinguishing gas supplied from the branch pipe 7 horizontally. Nozzle member 14 having 13.

  FIG. 11A is a side view showing the flow state of the fire extinguishing gas injected into the fire extinguishing target space 11, and FIG. 11B is a plan view showing the flow state of the fire extinguishing gas injected into the fire extinguishing target space 11. The fire extinguishing target space 11 is defined by four walls 16a, 16b, 16c, 16d, a ceiling 17 and a floor 18 of the building. The wall 16c, which is one of the walls 16a to 16d, has the jet head 3 on the wall 16c. Is installed with the nozzle hole 13 facing the fire extinguishing target space 11.

  When the occurrence of a fire is detected by a fire detection device (not shown), the fire detection device outputs a valve opening command signal to the fire extinguishing gas supply source 15, and the on-off valve provided in the fire extinguishing gas supply source 15 opens from the closed state. The fire extinguishing gas in the fire extinguishing gas filling container is supplied to the conduit 4 by the gas pressure of the pressurizing gas from the pressurizing gas filling container and ejected from the ejection head 3.

  As shown by the arrow A1 in FIG. 11A, the fire extinguishing gas ejected from the ejection head 3 abuts against the opposing wall 16a and flows in the fire extinguishing target space 11 from the upper layer space toward the lower layer space. As shown by the arrow A2, the left and right sides are dispersed by the opposing walls 16a, flow along the walls 16b and 16d toward the wall 16c on which the ejection head 3 is provided, and in the fire extinguishing target space 11 Can be extinguished in a state filled with fire extinguishing gas.

  Since the jet head 3 that jets the fire extinguishing gas in this way jets the fire extinguishing gas at a large flow rate, a large jet reaction force R is generated in the direction opposite to the jetting direction A3 of the fire extinguishing gas.

In order to confirm the injection reaction force R with respect to the injection flow rate when the extinguishing gas is injected by the conventional extinguishing gas injection device, the present inventor uses the injection reaction force R of the injection head 3 shown in FIG. A measurement test was conducted by changing the number of the containers filled with 20.3 m <3> / gas to 1, 5, and 10 containers. The measurement results are shown in Table 1.

  FIG. 12 is an enlarged cross-sectional view showing the internal structure of another conventional jet head 3a, and FIG. 13A is a side view showing the flow state of the fire extinguishing gas jetted by the jet head 3a shown in FIG. FIG. 13B is a plan view illustrating a flow state of the fire extinguishing gas ejected from the ejection head 3a into the fire extinguishing target space 11. FIG. The parts corresponding to those of the prior art in FIGS. 9, 10, 11A, and 11B are denoted by the same reference numerals. The ejection head 3 a has a nozzle member 14 a in which a plurality of nozzle holes 13 a are formed at equal intervals in the circumferential direction on an axis perpendicular to the central axis, and is installed with the central axis of the ceiling 17 being vertical.

  When the fire extinguishing gas is jetted horizontally from each nozzle hole 13a in the fire extinguishing target space 11 by such an ejection head 3a, the fire extinguishing gas flows from the center of the upper space as shown by an arrow A4 in FIG. 13A. After being guided along the ceiling 17, it flows downward by the walls 16 a and 16 c, and forms a radially dispersed flow from the central portion in the upper space, as indicated by an arrow A 5 in FIG. 13B.

  As described above, in this conventional jet head 3a, the fire-extinguishing gas is jetted from each nozzle hole 13a in a direction substantially perpendicular to the axis of the mounting portion 12 of the branch pipe 7, so that no jet reaction force R is generated. However, there is a problem that the fire-extinguishing gas cannot be directly jetted to a region immediately below the jet head 3a.

JP-A-8-173565

  The objective of this invention is providing the fire extinguishing gas injection apparatus which can reduce the injection reaction force by injection of fire extinguishing gas while being able to inject fire extinguishing gas along the axis line of an injection nozzle.

The present invention is a fire extinguishing gas injection device provided in a mounting portion that opens facing a fire extinguishing target space of a conduit to which a high-pressure fire extinguishing gas is supplied from a fire extinguishing gas supply source,
A nozzle member that is connected to an attachment portion and ejects the high-pressure fire extinguishing gas supplied from the conduit, the nozzle member having a plurality of nozzle holes having an axis perpendicular to the axis of the attachment portion;
A cylindrical guide member fixed at a predetermined fixed position, including a gas guide surface formed on the inner periphery of the nozzle hole of the nozzle member facing the nozzle hole from the outside of the nozzle member;
The guide member is constituted by a disc-shaped end plate through which the mounting portion is inserted in the center, and a cylindrical peripheral wall provided at one end in the axial direction of the end plate. Device.

In the present invention, the nozzle member has a nozzle hole, and the axis of the nozzle hole is orthogonal to the axis of the mounting portion.
The gas guide surface is formed of a part of a right cylindrical surface having an axis parallel to the axis of the mounting portion as a central axis.

In the present invention, the nozzle member has a nozzle hole, and the axis of the nozzle hole is orthogonal to the axis of the mounting portion.
The gas guide surface is a surface perpendicular to an axis perpendicular to the axis of the mounting portion.

  In the invention, it is preferable that the nozzle member is provided with a nozzle-side gas flow guide portion facing from the downstream side in the flow direction of the fire extinguishing gas in a space between the peripheral wall of the guide member and the nozzle member.

According to the present invention, the guide member is provided with a peripheral wall side gas flow guide portion facing from the downstream side in the flow direction of the fire extinguishing gas in a space between the nozzle member and the peripheral wall of the guide member.
Further, the present invention is characterized in that a sound absorbing material is provided on the gas guide surface of the guide member.

  According to the present invention, the fire-extinguishing gas injected from the nozzle hole of the nozzle member is guided by the peripheral wall of the guide member and the gas guide surface of the end plate, so that the fire-extinguishing gas injected from the nozzle hole is on this gas guide surface. Abuts, and the reaction force against the injection direction of the fire extinguishing gas injected from the nozzle hole is reduced. Further, since the gas guide surface is formed from the inner peripheral portion of the peripheral wall to the end plate so as to face the nozzle hole from the outside of the nozzle member, regardless of the position and direction in which the nozzle hole of the nozzle member is formed. The fire extinguishing gas ejected from the nozzle hole can be guided along the axis to the nozzle member by the gas guide surface, thereby ejecting the fire extinguishing gas along the axis of the ejecting head and also to the area opposite to the ejecting head. Can be supplied in a short time to fill the entire fire extinguishing target space.

It is the simplified sectional view showing fire extinguishing gas injection device 30 of one embodiment of the present invention. FIG. 2 is a perspective view showing a state where the fire extinguishing gas injection device 30 shown in FIG. 1 is attached to a conduit 32. 2B is a perspective view showing a state in which the branch pipe 45 shown in FIG. 2A is connected to the main pipe 43 by a branch pipe 44 as a falling pipe. FIG. It is the simplified sectional view showing fire extinguishing gas injection device 30a of other forms of implementation of the present invention. It is the simplified sectional view showing fire extinguishing gas injection device 30b of other embodiments of the present invention. It is the simplified sectional view showing fire extinguishing gas injection device 30c of other embodiments of the present invention. It is the simplified sectional view showing fire extinguishing gas injection device 30d of other embodiments of the present invention. It is simplified sectional drawing which shows the fire extinguishing gas injection apparatus provided with the guide member 64 of further another embodiment of this invention. It is the simplified sectional view showing a fire extinguishing gas injection device provided with guide member 66 of further another embodiment of the present invention. It is a perspective view which shows the fire extinguishing gas injection part 1 provided with the fire extinguishing gas injection apparatus of a prior art. 3 is an enlarged cross-sectional view showing an internal structure of the ejection head 3. FIG. 2 is a side view showing a flow state of fire extinguishing gas injected into a fire extinguishing target space 11. FIG. 3 is a plan view showing a flow state of a fire extinguishing gas injected into a fire extinguishing target space 11. FIG. It is an expanded sectional view which shows the internal structure of the jet head 3a of another prior art. It is a side view which shows the flow state in the fire extinguishing object space 11 of the fire extinguishing gas injected by the injection head 3a shown in FIG. It is a top view which shows the flow state of the fire extinguishing gas injected in the fire extinguishing object space 11 from the injection head 3a.

  FIG. 1 is a simplified cross-sectional view showing a fire extinguishing gas injection device 30 according to an embodiment of the present invention. The fire extinguishing gas injection device 30 according to the present embodiment is provided and connected to a mounting portion 34 that opens toward a fire extinguishing target space 33 called a fire extinguishing target space 33 of a conduit 32 to which a high-pressure extinguishing gas is supplied from a fire extinguishing gas supply source 31. A nozzle member 36 having a plurality of nozzle holes 35 for jetting high-pressure fire extinguishing gas supplied from the conduit 32, and a gas guide surface facing each nozzle hole 35 of the nozzle member 36 from the outer side of the nozzle member 36 37 includes a guide member 39 having a peripheral wall 38 formed on the inner peripheral portion.

  A plurality of nozzle holes 35 of the nozzle member 36 are arranged on the axis L2 orthogonal to the axis L1 of the mounting portion 34 at equal intervals in the circumferential direction with respect to the axis L1 of the mounting portion 34 (for example, 4 in this embodiment). It is formed. The guide member 39 includes the peripheral wall 38 described above and an end plate 41 that is formed radially inward from one axial end of the peripheral wall 38. The end plate 41 has, for example, a disk shape, and an insertion hole 42 through which the mounting portion 34 is inserted is formed at the center thereof. The attachment portion 34 is inserted into the insertion hole 42, and the inner peripheral portion facing the insertion hole 42 of the end plate 41 is fixed to the outer peripheral portion of the attachment portion 34 by, for example, welding. The end plate 41 and the attachment portion 34 are not limited to welding, and may be connected by a screw member such as a nut, for example. The distal end portion of the mounting portion 34 is inserted into the space surrounded by the peripheral wall 38 through the insertion hole 42 of the end plate 41, and the nozzle member 36 is mounted on this protruding portion. For joining the nozzle member 36 and the protruding portion of the mounting portion 34, for example, an external screw is cut at the tip of the mounting portion 34, and an internal screw is cut and screwed into the inner peripheral portion of the nozzle member 36. May be.

  FIG. 2A is a perspective view showing a state in which the fire extinguishing gas injection device 30 shown in FIG. The conduit 32 has a main pipe 43 connected to the fire extinguishing gas supply source 31, a branch pipe 44 interposed in the main pipe 43, and the fire extinguishing gas from the main pipe 43 is guided by the branch pipe 44, and the nozzle member 36 is connected. And a branch pipe 45. The branch pipe 45 rises from the main pipe 43 and is connected by the branch pipe 44, and an upper end portion thereof is bent at a right angle to form an attachment portion 34.

  As the fire extinguishing gas, N 2 gas, halide gas, or the like is used. When a fire occurs, the fire extinguishing gas can be injected into the fire extinguishing target space 33 to extinguish the fire.

As another embodiment of the present invention, as shown in FIG. 2B, the branch pipe 45 may be connected to fall from the main pipe 43 by the branch pipe 44. Also in this case, the nozzle member 36 and the peripheral wall 38 are provided on the attachment portion 34 of the branch pipe 45. Note that the same reference numerals are given to portions corresponding to the above-described embodiment.

  The inventor conducted a measurement test of the injection reaction force R in order to confirm that the injection reaction force R of the fire extinguishing gas injection device 30 of the present embodiment is reduced.

(Test conditions)
Inner diameter D1 of guide member 39 = φ128 mm
Nozzle member 36 outer diameter D2 = φ45 mm
Inner diameter d of nozzle hole 35 = φ5.5 mm
Number of nozzle holes 35 n = 4

  As a result of measuring such an injection reaction force R, it was confirmed that the injection reaction force R was reduced to about 1/4 as compared with the conventional injection head 3 shown in FIG.

  FIG. 3 is a simplified cross-sectional view showing a fire extinguishing gas injection device 30a according to a further embodiment of the present invention. Note that portions corresponding to those of the above-described embodiment are denoted by the same reference numerals. The fire-extinguishing gas injection device 30a of the present embodiment includes a disk-shaped pressure receiving plate 50 connected by a connecting piece 49 that extends from the nozzle member 36 on the same axis. The pressure receiving plate 50 has an outer peripheral portion which is a nozzle side gas flow guide portion facing a space between the peripheral wall 38 and the nozzle member 36 from the downstream side in the flow direction of the fire extinguishing gas. The outer diameter D3 of the pressure receiving plate 50 is selected to be larger than the outer diameter D2 of the nozzle member 36 and smaller than the inner diameter D1 of the guide member 39 (D2 <D3 <D1), and preferably (D1 + D2) / 2. Chosen. The outer peripheral portion 51 of the pressure receiving plate 50 and the opening peripheral portion 52 of the guide member 39 form an opening defined by a tapered truncated cone surface in the injection direction, and the fire extinguishing gas injected from the nozzle hole 35 is passed through the opening. As compared with the conventional jet head 3a shown in FIG. 12, the extinguishing gas arrival time in the region facing the extinguishing gas jetting device 30a is shortened and the extinguishing gas is shortened in the entire extinguishing target space. Can be charged in time.

  In another embodiment of the present invention, the outer diameter D3 of the pressure receiving plate 50 may be selected larger than the outer diameter D1 of the guide member 39 (D2 <D1 <D3).

  In order to confirm the injection reaction force of the fire extinguishing gas injection device 30a of the present embodiment, the present inventor provides a load cell behind the branch pipe 45 as shown by the phantom line 53 in FIG. Went.

(Measurement condition)
Inner diameter D1 of guide member 39 = φ128 mm
Nozzle member 36 outer diameter D2 = φ45 mm
Outer diameter D3 of the pressure receiving plate 50 = φ115 mm
Inner diameter d of nozzle hole 35 = φ5.5 mm
Number of nozzle holes 35 n = 4

  As a result of the measurement test of the injection reaction force R of the fire extinguishing gas injection device 30a, it was confirmed that the injection reaction force R can be further reduced as compared with the fire extinguishing gas injection device 30 of the above-described embodiment.

FIG. 4 is a simplified cross-sectional view showing a fire extinguishing gas injection device 30b according to still another embodiment of the present invention. Note that the same reference numerals are given to portions corresponding to the above-described embodiments. In the fire extinguishing gas injection device 30b of this embodiment, it should be noted that the sound absorbing material 56 is attached to the inner peripheral surface of the peripheral wall 38 of the guide member 39 and the inner surface of the end plate 41. In this way, by adhering the sound absorbing material 56 to the inner peripheral surface of the peripheral wall 38 of the guide member 39 and the inner surface of the end plate 41, the large injection sound generated by the fire extinguishing gas being injected from each nozzle hole 35 is absorbed. Thus, a silencing effect can be achieved.

  FIG. 5 is a simplified cross-sectional view showing a fire extinguishing gas injection device 30c according to still another embodiment of the present invention. Note that the same reference numerals are given to portions corresponding to the above-described embodiments. The fire-extinguishing gas injection device 30c of the present embodiment includes a bottomed straight cylindrical guide member 59 in which a distal end portion is inserted and fixed in a right columnar through hole 58 formed in a wall 57 of the building. The configuration is the same as that of each of the embodiments shown in FIGS.

  The peripheral wall 38 of the guide member 59 of this embodiment is formed long in the axial direction. For example, the length L11 is about 2 to 10 times the axial length L10 of the peripheral wall 38 of the guide member 39 shown in FIGS. = 2L to 10L. On the inner peripheral surface of the peripheral wall 38 of the guide member 59 and the inner surface of the end plate 41, a sound absorbing material 61 similar to the above is attached as a sound absorbing means.

  By using such a guide member 59, the injection sound generated in each nozzle hole 35 is attenuated until it reaches the open end facing the fire extinguishing target space 33 of the guide member 59, and a large injection sound is extinguished. The release into the target space 33 can be suppressed.

  FIG. 6 is a simplified cross-sectional view showing a fire extinguishing gas injection device 30d according to still another embodiment of the present invention. Note that the same reference numerals are given to portions corresponding to the above-described embodiments. The fire-extinguishing gas injection device 30d of the present embodiment includes a guide member 60 having a gas guide surface 37 that forms a part of a spherical surface, and other configurations are the same as those of the embodiment of FIG.

  By using the guide member 60 of the present embodiment, the fire extinguishing gas ejected from each nozzle hole 35 is smoothly guided toward the fire extinguishing target space 33, the flow path loss of the gas flow by the guide member 60 is reduced, and the ejection is performed. The reaction force R can be reduced.

  In order to confirm the injection reaction force R of the fire extinguishing gas injection device 30d of the present embodiment, the present inventor installs a load cell behind the branch pipe 45 as shown by an imaginary line 53 in FIG. A measurement test was conducted.

(Measurement condition)
Inner diameter D1 of the guide member 60 = φ146 mm
Nozzle member 36 outer diameter D2 = φ45 mm
Inner diameter d of nozzle hole 35 = φ5.4 mm
Number of nozzle holes 35 n = 4
Gas guide surface radius of curvature R1 = 73mm

  As a result of measuring the injection reaction force R of the fire extinguishing gas injection device 30d as described above, it was confirmed that the injection reaction force R can be reduced to about ½ compared to the above-described conventional technique of FIG.

  As still another embodiment of the present invention, as shown in FIG. 7, an annular pressure receiving portion 63 that extends inward in the radial direction is connected to one end in the axial direction opposite to the end plate 41 of the peripheral wall 38. A guide member 64 provided as a side gas flow guide may be used in place of the guide members 39, 59, 60.

  The pressure receiving portion 63 faces the space between the peripheral wall 38 and the nozzle member 36 from the downstream side in the flow direction of the fire extinguishing gas. By such a guide member 64, the pressure of the fire extinguishing gas injected from each nozzle hole 35 can be received by the pressure receiving portion 63 and offset from the injection reaction force R to be reduced.

As yet another embodiment of the present invention, as shown in FIG. 8, the outer diameter of the peripheral wall 38 is continuous with one end in the axial direction opposite to the end plate 41, and the outer diameter increases as the distance from the end plate 41 increases in the axial direction. Instead of the guide members 39, 59, 60, and 64, a guide member 66 provided with a smaller truncated cone-shaped pressure receiving portion 65 as a peripheral wall side gas flow guide portion may be used.

  The pressure receiving portion 65 faces the space between the peripheral wall 38 and the nozzle member 36 from the downstream side in the flow direction of the fire extinguishing gas. Also by such a guide member 64, the pressure of the fire extinguishing gas injected from each nozzle hole 35 can be received by the pressure receiving portion 65 and offset from the injection reaction force R to be reduced.

The following embodiments are possible for the present invention.
A fire-extinguishing gas injection device provided at a mounting portion that opens toward a fire target space of a conduit to which a high-pressure fire-extinguishing gas is supplied from a fire-extinguishing gas supply source, and is connected to the mounting portion and supplied from the conduit A nozzle member having a nozzle hole for injecting a fire extinguishing gas, and a cylindrical guide member fixed at a predetermined fixed position, and opposed to the nozzle hole of the nozzle member from the outside of the nozzle member on the inner periphery A fire extinguishing gas injection device comprising a guide member on which a gas guide surface is formed.

  According to the present embodiment, the fire extinguishing gas injected from the nozzle hole of the nozzle member is guided by the gas guide surface formed on the inner peripheral portion of the peripheral wall of the guide member. The injected fire extinguishing gas abuts, and the injection reaction force is reduced according to the angle of the gas guide surface with respect to the injection direction of the fire extinguishing gas injected from the nozzle hole. In addition, since the gas guide surface is formed on the inner peripheral portion of the peripheral wall so as to face the nozzle hole from the outside of the nozzle member, the gas guide surface is formed from the nozzle hole regardless of the position and direction of the nozzle hole of the nozzle member. The injected fire extinguishing gas can be guided along the axis of the nozzle member by the gas guide surface, and thereby the fire extinguishing gas is jetted along the axis of the jet head, and the fire extinguishing gas is also applied to the opposite area of the jet head in a short time. It can be supplied to fill the entire fire target space.

30, 30a, 30b, 30c, 30d Fire extinguishing gas injection device 31 Fire extinguishing gas supply source 32 Conduit 33 Fire extinguishing target space 34 Mounting portion 35 Nozzle hole 36 Nozzle member 37 Gas guide surface 38 Peripheral wall 39, 59, 60, 64, 66 Guide member 41 End plate 49 Connecting piece 50 Pressure receiving plate 56 Sound absorbing material

Claims (6)

A fire extinguishing gas injection device provided in a mounting portion that opens to face a fire extinguishing target space of a conduit to which a high pressure extinguishing gas is supplied from a fire extinguishing gas supply source,
A nozzle member that is connected to an attachment portion and ejects the high-pressure fire extinguishing gas supplied from the conduit, the nozzle member having a plurality of nozzle holes having an axis perpendicular to the axis of the attachment portion;
A cylindrical guide member fixed at a predetermined fixed position, including a gas guide surface formed on the inner periphery of the nozzle hole of the nozzle member facing the nozzle hole from the outside of the nozzle member;
The guide member is constituted by a disc-shaped end plate through which the mounting portion is inserted in the center, and a cylindrical peripheral wall provided at one end in the axial direction of the end plate. apparatus. A nozzle hole is formed in the nozzle member, and the axis of the nozzle hole is perpendicular to the axis of the mounting portion.
2. The fire extinguishing gas injection device according to claim 1, wherein the gas guide surface is formed of a part of a right cylindrical surface having an axis parallel to the axis of the mounting portion as a central axis. A nozzle hole is formed in the nozzle member, and the axis of the nozzle hole is perpendicular to the axis of the mounting portion.
The fire extinguishing gas injection device according to claim 1, wherein the gas guide surface is a surface perpendicular to an axis perpendicular to the axis of the mounting portion.   The nozzle member is provided with a nozzle-side gas flow guide portion facing from the downstream side in the flow direction of the extinguishing gas in a space between the peripheral wall of the guide member and the nozzle member. The fire extinguishing gas injection device according to one.   The guide member is provided with a peripheral wall side gas flow guide portion facing from the downstream side in the flow direction of the extinguishing gas in a space between the nozzle member and the peripheral wall of the guide member. The fire extinguishing gas injection device according to one.   The fire extinguishing gas injection device according to any one of claims 1 to 5, wherein a sound absorbing means is provided on the gas guide surface of the guide member.

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