Intrinsic safety audible and visual alarm

Abstract

The utility model relates to an intrinsic safety audible and visual alarm, which comprises a frequency control module, a step-down circuit, a safety barrier, a buzzer, an alarm lamp and a shell, and is characterized in that the frequency control module, the step-down circuit, the safety barrier, the buzzer and the alarm lamp are all arranged in the shell, and the frequency controller, the step-down circuit and the safety barrier are encapsulated in an encapsulation material; the input end of the safety barrier is connected with the connector, the connector is connected with power supply voltage, and the output end of the safety barrier is connected with the step-down circuit, the buzzer and the alarm lamp; the step-down circuit is used for reducing power supply voltage into working voltage of the frequency control module; and the frequency control module is connected with a buzzer and an alarm lamp. According to the utility model, double voltage stabilization measures are provided, the grade of intrinsic safety requirements is met, the non-intrinsic safety part and the safety barrier are all encapsulated, only the intrinsic safety part is exposed outside the encapsulating material, and the shell is used for protection, so that the whole machine is high in safety coefficient and good in durability.

Description

TECHNICAL FIELD

[0001] The utility model relates to dangerous place fire alarm equipment technical field especially, it is a kind of intrinsic safety sound and light alarm. BACKGROUND

[0002] With the sustained development of chemical technology in our country, the chemical industry in our country is thriving, all kinds of chemical enterprises are rapidly established like bamboo shoots after spring rain, and the development of storage, logistics and other industries related to chemical industry is also driven.

[0003] But while the rapid development of chemical industry, the safety problem of chemical industry is in front of the public. How to reduce, reduce the safety problem caused by chemical leakage, how to protect the safety problem of operating personnel on site, etc. More and more attention is paid, and safety production is becoming urgent.

[0004] The existing alarm equipment does not meet the explosion-proof requirements, cannot be applied to dangerous places, and is not suitable for on-site installation, therefore, an intrinsic safety sound and light alarm is needed to solve the above problems. SUMMARY

[0005] The utility model provides a kind of intrinsic safety sound and light alarm, can adapt to most market on-site dangerous gas detector, its interface can be assembled on the explosion-proof shell of on-site detector, using the alarm relay drive of on-site detector, high report time gives alarm intercommunication power supply can issue sound and light alarm, to solve the technical problem of prior art.

[0006] The technical scheme of the utility model is as follows: an intrinsic safety sound and light alarm, comprising: a frequency control module, a voltage reduction circuit, a safety barrier, a buzzer, an alarm lamp and a shell,

[0007] The frequency controller, voltage reduction circuit, safety barrier, buzzer and alarm lamp are all arranged in the shell, and the frequency controller, voltage reduction circuit and safety barrier are encapsulated in encapsulating material.

[0008] The main part of the buzzer is encapsulated in the encapsulating material, and the sound emitting part is arranged outside the encapsulating material.

[0009] The alarm lamp is arranged on the surface of the encapsulating material.

[0010] The input end of the safety barrier is connected to a connector, the connector is connected to a power supply voltage, and the output end of the safety barrier is connected to a voltage reduction circuit, a buzzer and an alarm lamp.

[0011] The voltage reduction circuit is used to reduce the power supply voltage to the working voltage of the frequency control module.

[0012] The frequency control module is connected with the buzzer and the alarm lamp, and is used for controlling the working frequency of the buzzer and the alarm lamp.

[0013] Further, the safety fence comprises a current limiting element and a voltage limiting element, the current limiting element comprises a fuse F1 and a first current limiting resistor R1, an input end of the fuse F1 is connected with the connector, and an output end of the fuse F1 is connected with one end of the first current limiting resistor R1.

[0014] The voltage limiting element comprises a fourth voltage stabilizing diode D4 and a fifth voltage stabilizing diode D5, the other end of the first current limiting resistor R1 is connected with the negative poles of the fourth voltage stabilizing diode D4 and the fifth voltage stabilizing diode D5 respectively, and the positive poles of the fourth voltage stabilizing diode D4 and the fifth voltage stabilizing diode D5 are connected with a signal ground.

[0015] Further, the voltage reducing circuit comprises a second current limiting resistor R2 and a second voltage stabilizing diode D2, one end of the second current limiting resistor R2 is connected with the other end of the first current limiting resistor R1, the other end of the second current limiting resistor R2 is connected with the negative pole of the second voltage stabilizing diode D2, and the positive pole of the second voltage stabilizing diode D2 is connected with the signal ground.

[0016] Further, there is a rectifier diode D1 between the fuse F1 and the first current limiting resistor R1.

[0017] Further, the positive pole of the alarm lamp is connected with the negative pole of a third voltage stabilizing diode D3, and the negative pole of the alarm lamp is connected with the positive pole of the third voltage stabilizing diode D3.

[0018] Further, the frequency control module comprises a timer, a third resistor R3, a capacitor C1, a fifth resistor R5, a seventh voltage stabilizing diode D7, a sixth voltage stabilizing diode D6, a MOS tube Q1, an OUT pin of the timer is connected with one end of the third resistor R3, the other end of the third resistor R3 is connected with one end of the capacitor C1, the other end of the capacitor C1 is connected with a signal ground, a DISCH pin of the timer is connected with one end of the fifth resistor R5, the negative pole of the seventh voltage stabilizing diode D7, the negative pole of the sixth voltage stabilizing diode D6 and the gate of the MOS tube Q1, the other end of the fifth resistor R5, the positive pole of the seventh voltage stabilizing diode D7 and the positive pole of the sixth voltage stabilizing diode D6 are connected with the signal ground, the source of the MOS tube Q1 is connected with the signal ground, and the drain of the MOS tube Q1 is connected with one end of the buzzer.

[0019] The utility model discloses the beneficial effect as follows: the utility model shell material main part adopts stainless steel material, ensures that the detection shell has stronger impact resistance, the PC material of red transparent part, gives both sides to the impact resistance and the light transmittance, the sound production part of buzzer is protected by stainless steel metal net, since the sound production chamber of buzzer is sealed, so the waterproof performance of this product is good, and the protection level can reach IP67.

[0020] The alarm is simple in wiring and convenient to use, contains a control circuit, and can work at a fixed frequency as soon as the alarm is connected to a power supply, without the need of a complex circuit for control; therefore, the alarm relay of the detector can be used for control, so that synchronous sound and light alarm of the on-site instrument can be realized.

[0021] The power input end is connected with a one-time quick-break fuse, so that the intrinsic safety performance of the product can not be affected when the product is out of order.

[0022] The utility model provides double pressure stabilizing measures, meets the grade of intrinsic safety requirement, and the non-intrinsic safety part and the safety fence are all poured and sealed, only the intrinsic safety part is exposed outside the pouring material, and has the shell protection, therefore, the whole machine safety factor is high, and the durability is good. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the structure diagram of the utility model.

[0024] Figure 2 It is the circuit diagram of the utility model.

[0025] Figure 3 It is the appearance diagram of the utility model. DETAILED DESCRIPTION

[0026] In order to make the person skilled in the art better understand the utility model scheme, the technical scheme in the embodiment of the utility model will be described clearly and completely in the embodiment of the utility model below, and the described embodiment is only a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the utility model.

[0027] In the technical scheme of the utility model, Figure 1 It is the structure diagram provided according to the specific structure of the utility model a kind of intrinsic safety sound and light alarm, Figure 3 It is the appearance diagram of the utility model. As Figure 1As shown, the utility model of specific include: frequency control module 3, voltage reducing circuit 2, safety barrier 1, buzzer 4, alarm lamp 5 and shell. Frequency controller, voltage reducing circuit 2, safety barrier 1, buzzer 4, alarm lamp 5 all are arranged in the shell, frequency controller, voltage reducing circuit 2 and safety barrier 1 are poured in the pouring material, the main part of buzzer 4 is poured in the pouring material, the sound production part is located in the pouring material outside, alarm lamp 5 is located in the surface of pouring material. Alarm lamp 5 can adopt LED lamp.

[0028] Specifically, the shell is made of stainless steel material, the buzzer 4 is poured in the stainless steel shell, wherein the sound hole is exposed to the surface of the pouring compound, the sound is emitted outside through the metal mesh hole, the LED is exposed to the surface of the pouring compound and located in the transparent lamp shade inside the shell, and the transparent lamp shade is connected with the stainless steel shell by thread and sealing glue. The pouring material can be epoxy resin pouring agent.

[0029] The input end of the safety barrier 1 is connected with the connector P1, the connector P1 is connected with the power voltage, and the output end of the safety barrier 1 is connected with the voltage reducing circuit 2, the buzzer 4 and the alarm lamp 5.

[0030] The voltage reducing circuit 2 is used for reducing the power voltage to the working voltage of the frequency control module 3.

[0031] The frequency control module 3 is connected with the buzzer 4 and the alarm lamp 5, and the frequency control module 3 is used for controlling the working frequency of the buzzer 4 and the alarm lamp 5.

[0032] Specifically, the power voltage is connected with the on-site dangerous gas detector by the connector P1, after the on-site dangerous gas detector detects the dangerous gas, the alarm relay of the on-site detector is used to send 24V direct current to the alarm to drive the alarm to work. The voltage reducing circuit 2 is used for reducing 24V to 5V to drive the frequency control module 3 to work.

[0033] In one embodiment of the utility model, as shown in Figure 2 The safety barrier 1 includes a current limiting element and a voltage limiting element, the current limiting element includes a fuse F1 and a first current limiting resistor R1, the input end of the fuse F1 is connected with the connector P1, and the output end of the fuse F1 is connected with one end of the first current limiting resistor R1.

[0034] The voltage limiting element includes a fourth zener diode D4 and a fifth zener diode D5, the other end of the first current limiting resistor R1 is connected with the negative pole of the fourth zener diode D4 and the fifth zener diode D5 respectively, and the positive poles of the fourth zener diode D4 and the fifth zener diode D5 are connected with the signal ground.

[0035] The rated current of the alarm is In fuse current rating is not less than 1.7 x I n The current-limiting resistor R1 prevents the fourth voltage stabilizing diode D4 and the fifth voltage stabilizing diode D5 from being burnt out.

[0036] The intrinsic safety short-circuit current I short = V D4Z x 1.05 ÷ (R1 x 0.95) and is less than the short-circuit current under the maximum working voltage U m of the alarm stipulated by the intrinsic safety.

[0037] The voltage limiting element adopts double voltage stabilizing measures, including the fourth voltage stabilizing diode D4 and the fifth voltage stabilizing diode D5, which provide voltage limitation for the intrinsic safety circuit, and the voltage stabilizing voltage of the fourth voltage stabilizing diode D4 and the fifth voltage stabilizing diode D5 should be less than or equal to the maximum working voltage value of the intrinsic safety circuit.

[0038] In an embodiment of the utility model, as shown in Figure 2 The voltage reducing circuit 2 includes the second current-limiting resistor R2 and the second voltage stabilizing diode D2, one end of the second current-limiting resistor R2 is connected to the other end of the first current-limiting resistor R1, the other end of the second current-limiting resistor R2 is connected to the negative pole of the second voltage stabilizing diode D2, and the positive pole of the second voltage stabilizing diode D2 is connected to the signal ground. There is the rectifier diode D1 between the fuse F1 and the first current-limiting resistor R1.

[0039] The input voltage of the connector P1 is 24V, the rectifier diode D1 connected in series on the input power line plays the anti-reverse connection role, the 5V voltage is output by the 24V through the second current-limiting resistor R2 and the second voltage stabilizing diode D2, and the second voltage stabilizing diode D2 is the 5V voltage stabilizing diode.

[0040] In an embodiment of the utility model, as shown in Figure 2 The positive pole of the alarm lamp 5 is connected to the negative pole of the third voltage stabilizing diode D3, and the negative pole of the alarm lamp 5 is connected to the positive pole of the third voltage stabilizing diode D3.

[0041] The third voltage stabilizing diode D3 is reversely connected to the alarm lamp 5 and provides working voltage for the alarm lamp 5, and the voltage stabilizing value is not greater than the highest working voltage of the alarm lamp 5 and is not less than the lowest working voltage of the alarm lamp 5; the voltage resistance value of the buzzer 4 is greater than V D4Z -V LED , and the working current is less than I LED +I D3 .

[0042] In an embodiment of the utility model, as shown in Figure 2As shown, the frequency control module 3 includes a timer, a third resistor R3, a capacitor C1, a fifth resistor R5, a seventh voltage stabilizing diode D7, a sixth voltage stabilizing diode D6, and a MOS tube Q1, one end of the third resistor R3 is connected to the OUT pin of the timer, the other end of the third resistor R3 is connected to one end of the capacitor C1, the other end of the capacitor C1 is connected to a signal ground, the DISCH pin of the timer is connected to one end of the fifth resistor R5, the negative electrode of the seventh voltage stabilizing diode D7, the negative electrode of the sixth voltage stabilizing diode D6, and the gate of the MOS tube Q1, the other end of the fifth resistor R5, the positive electrode of the seventh voltage stabilizing diode D7, and the positive electrode of the sixth voltage stabilizing diode D6 are connected to the signal ground, the source of the MOS tube Q1 is connected to the signal ground, and one end of the buzzer 4 is connected to the drain of the MOS tube Q1.

[0043] The seventh voltage stabilizing diode D7 and the sixth voltage stabilizing diode D6 provide a limit for the working voltage of the MOS tube Q1.

[0044] The timer can be a 555 timer chip, and the third resistor R3 and the capacitor C1 connected to the U1 555 timer determine the period of the control signal output by the 555 timer chip, and the working period T=2*tau=2*R3*C1=1S, which is the working period of the alarm lamp 5 and the buzzer 4 F1; the principle is that the OUT pin of the 555 timer charges the capacitor C1 through the third resistor R3, and when the capacitor voltage reaches 2 / 3VCC, the 555 timer internally controls the DISCH pin to discharge the OUT, and the DISCH pin presents a low impedance channel to the GND, that is, the DISCH outputs a low level, at this time the MOS tube Q1 is turned off, the buzzer 4 and the alarm lamp 5 do not work, and the OUT pin outputs a low level; the capacitor C1 is discharged through the third resistor R3, and when the capacitor voltage is lower than 1 / 3VCC, the DISCH pin is open-drain output, the working voltage of the MOS tube Q1 is equal to the voltage across the fifth resistor R5, the MOS tube Q1 is turned on, the buzzer 4 is sounded, and the alarm lamp 5 is turned on, that is, the flashing frequency and the sounding frequency of 1Hz can be realized.

[0045] The shell material main body part is made of stainless steel material, so that the detection shell has strong impact resistance; the light-emitting part is made of red transparent PC material, so that the impact resistance and light transmission are considered; the sounding part of the buzzer 4 is protected by the stainless steel mesh, and since the sounding chamber of the buzzer 4 is sealed, the product has good waterproof performance, and the protection level can reach IP67.

[0046] The alarm has simple wiring and is convenient to use, contains a control circuit, and can work at a fixed frequency as soon as the alarm is connected to the power supply, without the need for a complex circuit for control; therefore, the alarm relay of the detector can be used for control, so that synchronous sound and light alarm of the on-site instrument can be realized.

[0047] The power input end is connected with a one-time quick-break fuse, so that the product will not affect its intrinsic safety performance when it is invalid;

[0048] The utility model provides double steady voltage measure, the grade of meeting intrinsic safety requirement, the whole is poured and is sealed in non-intrinsic safety part and safety barrier 1, only intrinsic safety part is exposed to the outside of pouring and sealing material, and there is shell protection, therefore the whole machine safety factor is high, and the durable performance is good.

[0049] Finally, it should be explained that the above specific embodiments are only used to illustrate the technical solutions of the utility model and are not limited. Although the utility model has been described in detail with reference to examples, those skilled in the art should understand that the technical solutions of the utility model can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the utility model, and they should be covered in the scope of the claims of the utility model.

Claims

1. An intrinsically safe sound and light alarm (5) characterized in that, The frequency control module (3), the voltage reduction circuit (2), the safety barrier (1), the buzzer (4), the alarm lamp and the shell are arranged in the shell, and the frequency control module (3), the voltage reduction circuit (2) and the safety barrier (1) are poured into the pouring material. The input end of the safety barrier (1) is connected with the connector P1, the connector P1 is connected with the power supply voltage, and the output end of the safety barrier (1) is connected with the voltage reduction circuit (2), the buzzer (4) and the alarm lamp. The voltage reduction circuit (2) is used for reducing the power supply voltage to the working voltage of the frequency control module (3). The frequency control module (3) is connected with the buzzer (4) and the alarm lamp, and is used for controlling the working frequency of the buzzer (4) and the alarm lamp. The safety barrier (1) comprises a current limiting element and a voltage limiting element, the current limiting element comprises a fuse F1 and a first current limiting resistor R1, the input end of the fuse F1 is connected with the connector P1, and the output end of the fuse F1 is connected with one end of the first current limiting resistor R1. The voltage limiting element comprises a fourth voltage stabilizing diode D4 and a fifth voltage stabilizing diode D5, the other end of the first current limiting resistor R1 is connected with the negative poles of the fourth voltage stabilizing diode D4 and the fifth voltage stabilizing diode D5 respectively, and the positive poles of the fourth voltage stabilizing diode D4 and the fifth voltage stabilizing diode D5 are connected with the signal ground.

2. The intrinsically safe acousto-optic alarm (5) according to claim 1, characterized in that The voltage reduction circuit (2) comprises a second current limiting resistor R2 and a second voltage stabilizing diode D2, one end of the second current limiting resistor R2 is connected with the other end of the first current limiting resistor R1, the other end of the second current limiting resistor R2 is connected with the negative pole of the second voltage stabilizing diode D2, and the positive pole of the second voltage stabilizing diode D2 is connected with the signal ground. There is a rectifier diode D1 between the fuse F1 and the first current limiting resistor R1.

3. The intrinsically safe acousto-optic alarm (5) according to claim 2, characterized in that The positive pole of the alarm lamp is connected with the negative pole of a third voltage stabilizing diode D3, and the negative pole of the alarm lamp is connected with the positive pole of the third voltage stabilizing diode D3.

4. The intrinsically safe acousto-optic alarm (5) according to claim 2, characterized in that The frequency control module (3) comprises a timer, a third resistor R3, a capacitor C1, a fifth resistor R5, a seventh voltage stabilizing diode D7, a sixth voltage stabilizing diode D6, a MOS tube Q1, the OUT pin of the timer is connected with one end of the third resistor R3, the other end of the third resistor R3 is connected with one end of the capacitor C1, the other end of the capacitor C1 is connected with the signal ground, the DISCH pin of the timer is connected with one end of the fifth resistor R5, the negative pole of the seventh voltage stabilizing diode D7, the negative pole of the sixth voltage stabilizing diode D6 and the gate of the MOS tube Q1, the other end of the fifth resistor R5, the positive pole of the seventh voltage stabilizing diode D7 and the positive pole of the sixth voltage stabilizing diode D6 are connected with the signal ground, the source of the MOS tube Q1 is connected with the signal ground, and the drain of the MOS tube Q1 is connected with one end of the buzzer (4).

5. The intrinsically safe acousto-optic alarm (5) according to claim 1, characterized in that The shell is made of stainless steel material.

6. The intrinsically safe acousto-optic alarm (5) according to claim 1, characterized in that ​ 7. The intrinsically safe acousto-optic alarm (5) according to claim 1, characterized in that ​

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