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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram of an embodiment of the
present invention. 1 ··························································· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· '' current limiting resistor, 4 ... Part, 6 ··· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · piezoelectric
element. ・ One-to-one '[-163-
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the intrinsically
safe explosion-proof IE electrical equipment applicable in accordance with the factory electrical
equipment explosion-proof guidelines (cass steam explosion-proof 1970). In the case of brat that
handles explosive gas, it is often necessary to display 111 items of electrical equipment installed
in a non-hazardous area at a risk.小 漬 小〕 フ フ フ フ-か)) 11-Ct)). However, the electrical
equipment of these pressure proof and explosion proof constructions are large for both internal
use and cedar-like markets, and their wiring and non-exposure proof constructions are not
comparable as compared with 1-. It took time. Recently intrinsically safe explosion-proof
electrical equipment appeared as a new explosion-proof construction, small in size, light weight,
safety is very advantageous in terms of installation and handling, such as wiring or general
electrical one. Therefore, although it is in a rapidly increasing situation, it has been difficult to
reduce the gravity of the bushers and bells so that the low consumption gravity has not been
achieved. In view of the above-described situation, the present invention is to provide an intrinsic
safety and explosion-proof groover 7 by using a piezoelectric sensor (trade name) with very low
power consumption. Since the piezoelectric cushion using the piezoelectric element as the
sounding body utilizes the resonance of the piezoelectric element itself, it is possible to obtain six
seconds as a busher although it consumes a small amount of power and is extremely small. That
is, when a DC voltage of 24 V is applied, the current is lQ mA or less, and at this time, the volume
is obtained at 80 m per 80 cm from the busher. It is an object of the present invention to try to
obtain an intrinsically safe explosion-proof busher with only low construction failure and using
fC, which utilizes the nature d that the consumption weight may be unreasonably small. This will
be described with reference to the drawings. In the drawing, the power supply box 3 is provided
with a transformer 31 with a collision prevention plate and a resistor 32 for current limitation,
and the primary side 311 of the transformer 31 with a collision prevention plate is connected in
series to the commercial power source 1 through the switch means 2 The secondary side 312 is
connected in series to the current limiting resistor 32 and is wired to the busher 4 installed at the
dangerous place. The busher 4 is composed of a rectifying and smoothing unit 5 comprising a tie
auto 51 and a conotenosa 52, and a Colpitts type oscillation unit 6 comprising a transformer 61,
resistors 62.63, contenosers 64 and 65, and a piezoelectric element 66. The piezoelectric
element 66 is formed into a disk shape so as to function as a sound generator or to function as
an electronic body along with the operation of the oscillation unit 6 as a mover, and the required
electrical conductivity 11 is processed.
The transformer 31 with anti-corrosion plate isolates the commercial market 1 and the electrical
path wired to the dangerous place so as not to lose all essential explosion-proof properties)-)-)
and performs the exchange of the market kaka The limiting resistor 32 is connected to the
dangerous place by wiring or short-circuiting so that the heavy seat flowing to it will be 71 'to
the ignition limit of the target explosive waste. It is to do. The switch means 2 is configured to
transmit the open / close state of the switch means 2 to the flange 4 installed at the dangerous
place as the contact point of the pressing hot water and the relay, and to notify the open / close
state of the switch means 2 at the dangerous place. . In the above configuration, when the switch
means 2 is closed, if voltage is applied to the primary side 311 of the transformer 31 with a
collision prevention plate and voltage 1 is induced on the secondary side 312, this AC voltage is
Through the resistor 32, it is printed on the flange 4 and is rectified and smoothed by the
rectifying and smoothing unit 5, and is applied to the -0 vibration unit 6 to ring the bushing. In
this case, the current flowing to the face 4 is less than tQ lQ mA. The current limit resistance 32
by this current is small, so the resistance value of the current limit resistance 32 is intrinsically
safety-proof Even if the value is increased to be a safe value, the operation of the fuser 4 is
disturbed and 7N. Therefore, it is possible to maintain the intrinsic safety and explosion
resistance sufficiently-)-), and to make the busher 4 perform an inherent operation. The present
invention is limited to the illustrated embodiment and various modifications can be made. For
example, a rectifying and smoothing unit 33 may be provided between the secondary side of the
transformer 3102 with a collision prevention plate and the current limiting resistor 32, and
power may be transmitted to the fuse 4 by direct current. In addition to the omission of the
power supply box 3 and the busher 4 Q) power transmission or direct current, there is the
advantage that a large amount of power can be sent compared to the case of alternating current
transmission. That is, in the case of power transmission, intrinsic safety explosion-proof
determines the resistance value of the current limiting resistor 32 in consideration of intrinsic
safety with respect to its maximum voltage / current end 1 (only one or the same peak value By
comparing the alternating current with the direct current, it is possible to make the effective
power value more direct to direct current or to increase the volume of the booster 4 accordingly.
In addition, it is well known that the appropriate I′′C part of Husa-4 can be used to interrupt
the sound generation of Husa-4 by, for example, straightening + sliding part 5 and 1′′7 ′ ′
seventy-one consecutive f41 + minutes at the door. Furthermore, it is obvious that the oscillation
unit 60 can use various known oscillation circuits other than the illustration Q) Colchinoso type.
As described above, according to the present invention, according to the present invention, the
power supply box 3 in which the current limiting resistor 32 is connected in series to the
secondary side of the transformer 31Z with a collision prevention plate and the piezoelectric
element 66 as a sound generator By connecting (4), an intrinsically safe explosion-proof bushing
is obtained.