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JP2013172232

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DESCRIPTION JP2013172232
Abstract: A heat-resistant speaker capable of operating properly as a speaker at least for a
predetermined time even when a fire or the like occurs. SOLUTION: The flat type speaker main
body 20 and a water tank 30 provided on the back surface of the speaker main body 20, heat
from the outside rises temperature of water filled in the water tank 30, and evaporation of water
By being taken away by heat, an excessive temperature rise of the speaker main body 20 can be
suppressed, and the speaker operates properly until the water tank 30 is exhausted. [Selected
figure] Figure 1
Heat resistant speaker
[0001]
The present invention relates to a heat-resistant speaker, and more particularly to a heatresistant speaker having heat resistance that can operate for a certain period of time even when,
for example, a fire occurs.
[0002]
Article 8 of the Fire Service Law states: “Schools, hospitals, factories, business establishments,
entertainment halls, department stores (including large-scale retail stores specified by a Cabinet
Order pursuant to this), multipurpose fireproof objects (fireproof objects We say thing provided
for two or more uses to fix by Cabinet Order.
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) A person who has the authority to manage the fireproof object which a large number of other
persons enter or leave, work or reside in accordance with a Cabinet Order shall define a fire
protection manager from among persons having qualifications prescribed by a Cabinet Order,
About preparation of firefighting plan about firefighting, firefighting based on the firefighting
plan concerned, conduct of training of firefighting, facilities to use for firefighting, check and
maintenance of facility necessary for firefighting water or firefighting activity, supervision about
use or the handling of fire , Maintenance and management of structures and equipment
necessary for evacuation or fire protection, management of accommodation personnel, and other
tasks necessary for fire prevention management. The duty of the fire protection manager is
defined as
[0003]
And about the speaker used for emergency broadcast equipment, heat resistance "in the air
stream of 80 ° C for 30 minutes" by the firefighting agency notification firefighting permission
54th in 1987 and the notification firefighting permission 22nd in 1994 firefighting agency It is
prescribed to use certified products with sex.
[0004]
Moreover, since JIS (Japanese Industrial Standard) A 1304 "Test method for fire resistance of
building structure part" defines the test method, it is desirable that the heat resistant speaker can
withstand the fire test.
[0005]
FIG. 2 is a schematic cross-sectional view showing an example of a conventionally proposed heatresistant speaker.
In FIG. 2, in the case 1 made of steel, a wire mesh 3 is stretched in the opening 2 on the front.
A seat plate 4 is screwed on the front inner side of the case 1 so as to close the entire surface.
The seat plate 4 is made of a flame-retardant material having a high degree of thermal insulation,
such as phenol resin, and the opening 6 matched to the diameter of the speaker 5 is unscrewed,
and the speaker 5 is screwed and attached to the speaker 5 Transformers and terminal blocks
are also attached. The back of the case 1 is closed by a steel back cover 7. A non-combustible and
breathable heat insulating material 8 such as asbestos or glass wool is packed in the inner wall
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2
including the wire mesh 3 and the seat plate 4 of the case 1 configured as described above so as
to cover the entire surface ( Patent Document 1).
[0006]
FIG. 3 is a schematic cross-sectional view showing another example of the heat-resistant speaker
proposed conventionally. In FIG. 3, the case 10 housing the speaker 9 is attached to the
mounting hole 12 provided in the ceiling tile 11 via the mounting members 13 and 14 so that
the front of the speaker 9 slightly protrudes from the ceiling tile 11 It is done. The entire outer
periphery including the case 10 and the attachment members 13 and 14 attached to the
attachment holes 12 of the ceiling tile 11 in this manner is covered with a heat insulating
material 15 (Patent Document 2).
[0007]
Japanese Patent Publication No. 63-18219 US Publication No. US 2008/0087492 A1
[0008]
However, all of these conventional structures basically protect the speaker with a heat insulating
material, and it seems difficult to obtain sufficient heat insulation and heat resistance sufficient
for practical use.
[0009]
Also, although the present speaker can only withstand up to about 120 ° C. due to the
characteristics of the material being used, the temperature of the speaker body is at least at least
in the above-mentioned “280 ° C. for 30 minutes” fire resistance test environment If a
structure that can be maintained at 120 ° C. or less for 30 minutes can be realized, the speaker
will properly operate as an original speaker during that time.
[0010]
The present invention solves such a problem, and an object thereof is to realize a heat-resistant
speaker which can properly operate as a speaker at least during a predetermined fire resistance
test time.
[0011]
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In order to achieve such a subject, the invention according to claim 1 of the present invention is
characterized by comprising a flat type speaker main body and a water tank provided on the
back surface of the speaker main body. Heat resistant speaker.
[0012]
According to a second aspect of the present invention, in the heat-resistant speaker according to
the first aspect, the water tank is formed with a bottomed outer cylinder whose one end is open
and shorter than the outer cylinder and enclosed in the outer cylinder. The pressure chamber is
formed as a double cylindrical body with a bottomed inner cylinder fixed to the inner peripheral
wall surface in the vicinity of the opening of the outer cylinder, and a pressure valve is provided
to communicate with the space portion of these double cylindrical bodies. It is characterized in
that it is filled with water, and the back surface of the speaker body is fixed so as to close the
opening of the water tank.
[0013]
The invention according to claim 3 is the heat resistant speaker according to claim 1 or 2,
wherein the speaker body and the water tank are housed in the outer case so that the diaphragm
of the speaker body is exposed to the front. It is characterized by
[0014]
The invention according to claim 4 is characterized in that, in the heat-resistant speaker
according to claim 3, a space communicating with the atmosphere is provided between the water
tank and the outer case.
[0015]
The invention according to claim 5 is the heat-resistant speaker according to any one of claims 1
to 4, wherein the speaker body includes a diaphragm and an electric-force conversion unit for
driving the diaphragm via a stem. It is characterized by being connected.
[0016]
The invention according to claim 6 is the heat resistant speaker according to any one of claims 1
to 5, wherein a storage battery for driving the speaker main body is provided in a space portion
between the speaker main body and the inner cylinder. It is characterized by
[0017]
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According to the invention of claim 1 and claim 2, the speaker can operate properly for at least
30 minutes due to the increase of the water temperature and the vaporization of the heat from
the outside.
[0018]
According to the third aspect of the present invention, the speaker body and the water tank are
protected by the outer case against mechanical impact, dust and the like from the outside.
[0019]
According to the invention of claim 4, the space portion provided between the water tank and the
outer case and communicated with the atmosphere functions as a thermal insulating portion
which thermally insulates the water tank and the outer case, The temperature rise of the speaker
body and the water tank due to the amount of heat from the outside can be suppressed as
compared with the case without the outer case.
[0020]
According to the fifth aspect of the invention, by using the flame retardant member as the
diaphragm exposed on the surface, it is possible to construct a flat type speaker main body which
is excellent in heat resistance.
[0021]
According to the invention of claim 6, by providing the storage battery for driving the speaker
main body in the space portion between the speaker main body and the inner cylinder, the
speaker can be driven for a fixed time even if the supply of commercial power is shut off in an
emergency. it can.
[0022]
It is a schematic sectional drawing which shows the example of embodiment of this invention.
It is a schematic sectional drawing which shows an example of the heat-resistant speaker
currently proposed conventionally.
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It is a schematic sectional drawing which shows the other example of the heat-resistant speaker
proposed conventionally.
[0023]
FIG. 1 is a schematic cross-sectional view showing an embodiment of the present invention.
In FIG. 1, the heat-resistant speaker according to the present invention stores a speaker body 20,
a water tank 30 formed of a double cylindrical body fixed to the back of the speaker body 20,
and the speaker body 20 integrated with the water tank 30. And an outer case 40.
[0024]
The speaker main body 20 includes a diaphragm 21, a frame 22, an electric-force conversion
unit 23, and a stem 24.
[0025]
The diaphragm 21 is formed in a disk shape of metal, a flame retardant plastic member or the
like, and in the vicinity of the outer periphery, a thin portion for physically separating the
vibrating portion and the edge portion to increase the vibration of the vibrating portion.
Concentric concave portions 21a are provided.
[0026]
The frame 22 is a structure in which a metal, a flame retardant plastic member, or the like is
partially punched out so as to mechanically connect the parts constituting the speaker main body
20, and is formed in a truncated cone shape as a whole. ing.
The outer peripheral portion of the diaphragm 21 is fixed to the large diameter end of the frame
22, and the electric-force conversion unit 23 is fixed to the small diameter end.
[0027]
The electric-force conversion unit 23 drives the diaphragm 21 to mechanically vibrate the
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diaphragm 21 with the electric signal obtained by amplifying the audio signal to generate an
audible signal, and is configured of a magnet, a yoke, a voice coil, etc. But not shown.
[0028]
The stem 24 has one end fixed to the diaphragm 21 and the other end fixed to the movable
portion that outputs the force converted by the electric-force conversion unit 23, and is made of
metal, a flame retardant plastic member, etc. It is done.
[0029]
The water tank 30 is formed with a bottomed outer cylinder 31 open at one end and shorter than
the outer cylinder 31 and included in the outer cylinder 31, and the open end is fixed to the
inner peripheral wall surface near the opening of the outer cylinder 31 It is configured as a
double cylindrical body with the bottomed inner cylinder 32.
A pressure valve 33 is provided on the side wall of the outer cylinder 31 so as to communicate
with the space portion of the double cylindrical body, and the space portion of the double
cylindrical body is filled with water.
The pressure valve 33 is provided at the upper portion of the water tank 30 in the installed state
because the pressure valve 33 discharges water vapor.
[0030]
In the opening of the water tank 30 configured as described above, that is, the opening of the
outer cylinder 31, a part of the frame 22 constituting the back surface of the speaker main body
20 is fixed so as to close the opening of the water tank 30.
In addition, the double cylindrical body of the outer cylinder 31 and the inner cylinder 32 which
comprise the water tank 30 is also comprised with a metal, a flame-retardant plastic member, etc.
FIG.
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[0031]
The outer case 40 is made of, for example, aluminum having a high heat conductivity so as to
house the speaker body 20 and the water tank 30 with the diaphragm 21 of the speaker body 20
exposed to the front, but other members It may be
[0032]
In the present embodiment, a space is provided between the water tank 30 and the outer case
40, and the space communicates with the atmosphere through an air hole 41 provided on the
back of the outer case 40. doing.
[0033]
A space is formed between the back of the speaker main body 20 and the inner cylinder 32
constituting the water tank 30, and in this space, the amplifier 25 for driving the speaker main
body 20 and the emergency when the commercial power is shut off A storage battery 26 for
supplying power to the amplifier 25 is sometimes provided.
[0034]
The configuration of FIG. 1 will be described using specific numerical values.
In the following description, assuming that a cylindrical speaker system is used to simplify the
description and a speaker with a diameter of 10 cm, which is relatively easy to combine acoustic
performance, is used as the speaker main body 20, the approximate dimension is the diameter d
= 12 cm. (Radius r = 6 cm) and height H = 15 cm.
[0035]
The total surface area A in this case is A = 2 × πr <2> + π × d × HH791 (cm <2>).
[0036]
By providing the water tank 30 in this cylindrical speaker system, it is possible to obtain
practically sufficient heat insulation and heat resistance compared to the prior art, but in order to
obtain more effects, as shown in FIG. It is desirable to provide an outer case 40 that houses the
cylindrical speaker system via a layer (space).
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[0037]
When an air layer of thickness Δx = 0.5 cm is formed on the outer periphery of the cylindrical
speaker system and surrounded by the outer case 40, the heat quantity Q1 supplied to the
surface of the water tank via the air layer is Since the thermal conductivity を is 0.0241 W / m ·
K and the temperature difference ΔT is raised from 20 ° C. to 100 ° C. at 280 ° C., 280 ° C.20 ° C. = 260 ° C. and 280 ° C. Assuming an average of 220 ° C. and C-100 ° C. = 180 °
C., the following is obtained.
[0038]
Q1 = κ × (ΔT / Δx) × A = 0.0241 × (220 / 0.005) × 0.0791 883.9 (W) However, the
temperature is 280 at a stretch also in JIS A1304 and the actual situation. Since the temperature
does not rise to ° C. but gradually rises, it can be estimated that the amount of heat Q 2 until
finally reaching 280 ° C. is about 80%.
[0039]
Q2 = 83.9 × 0.8 ≒ 67.1 (W) The amount of heat required for the water in the water tank 30 to
vaporize will be described.
[0040]
In the cylindrical speaker system of the above dimensions, even if the amplifier 25 and the
storage battery 26 are provided in the space portion formed between the back surface of the
speaker main body 20 and the inner cylinder 32 constituting the water tank 30, Since 6 cm can
be secured as the depth h of the water tank formed between the bottom surface and the bottom
surface of the inner cylinder 32, the volume V of this portion is: V = h × πr <2> ≒ 113 (cm <3>)
From this, 113 g of water can be secured.
[0041]
This 113 g of water rises from normal temperature (20 ° C.) and evaporates, and the total heat
amount Q3 required until it is released from the pressure valve 33 is determined. Heat amount
Q4 from 20 ° C. to 100 ° C. boiling. Since Q4 = 113 × 80 × 4.2 ≒ 38 × 10 <3> (J), and the
heat of vaporization of water is 2257 J / g, the heat amount Q5 required to vaporize 113 g of
water is Since Q5 = 113 × 2257 ≒ 255 × 10 <3> (J), Q3 = Q4 + Q5 = 293 × 10 <3> (J).
[0042]
From these, all the water filled in the water tank 30 is vaporized by heating, and the time T until
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it is discharged from the pressure valve 33 becomes T = Q3 / Q2 4 4367 (seconds) → equivalent
to 72 minutes .
[0043]
Therefore, the temperature of the space formed between the rear surface of the speaker main
body 20 and the inner cylinder 32 constituting the water tank 30 can be maintained at 100 ° C.
or less for one hour or more, and the aforementioned “280 ° C., The speaker can be properly
operated during a predetermined fire resistance test time defined as “30 minutes”.
[0044]
As apparent from the above description, by providing a small water tank in the flat speaker
system, the water filled in the water tank intervenes between the speaker main body and the
outside, and the heat from the outside is Since the heat from the outside is taken away by the
temperature rise of the water filled in the water tank and the heat of vaporization of the water
without directly heating the speaker body, an excessive temperature rise of the speaker body can
be suppressed, and at least the water tank is filled It works properly as a speaker until the water
runs out.
[0045]
Then, by providing the air layer by enclosing the outer peripheral portion of the water tank with
the outer case, the heat insulation to the inside of the speaker system can be further enhanced,
and proper operation as a speaker for a longer time becomes possible.
As described above, the outer case 40 is not an essential component of the present invention.
[0046]
By forming the water tank with aluminum or the like having a high thermal conductivity, heat
can be spread throughout the water tank and can be efficiently dispersed.
[0047]
The shape of the water tank is preferably cylindrical as in the above embodiment because of
space efficiency, but it is not limited thereto, and may be cubic, rectangular solid, hemispherical
or the like.
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[0048]
By providing the storage battery inside the speaker system, as described above, even if the
commercial power is shut off in an emergency, the speaker can be driven for a certain period of
time.
[0049]
As the high temperature speaker system provided with the water cooling function in the speaker
unit, Japanese Utility Model Application Laid-open Nos. 04-36396 and 04-36397 have been
disclosed, however, these are all noises of the exhaust gas fan provided in the duct. Is used as a
speaker for reducing noise by adding a negative phase sound to the duct through a speaker and
detecting the noise with a microphone, and the heat-resistant speaker of the present invention
used for emergency broadcasting equipment at the time of fire occurrence etc. Are completely
different in purpose, composition and effect.
[0050]
20: Speaker body 21: Diaphragm 22: Frame 23: Electro-force converter 24: Stem 30: Water tank
31: Outer cylinder 32: Outer cylinder 33: Pressure cylinder 40: Outer case 41: Air hole
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