KR0130735Y1 - Alarm device in using gas leakage - Google Patents

Abstract

The present invention relates to a gas leakage alarm device, in particular, it is easy to connect the external interlocking device by forming a variety of gas leakage alarm output, gas leakage alarm device made to be accurate driving to prevent malfunction by miscellaneous gas The gas leakage alarm output for detecting gas leakage is output at various levels to facilitate the connection of various external interlocking devices to the output stage, and the gas leakage detection concentration is detected at about 1/4 of the lower explosion limit concentration. Provides a gas leakage alarm device that can eliminate malfunction due to miscellaneous gas by outputting alarm with a third delay, and implements an adapter that can transmit gas leakage detection signal to a gas leakage alarm device. Adapter to facilitate centralized monitoring in disaster prevention systems In order to provide a gas leakage alarm device capable of detecting disconnection and power failure of an input line, a detection unit for detecting a gas leakage as a hot wire contact combustion sensing element, and a constant voltage unit including a constant voltage switching circuit for supplying power to the detection unit. Comparing the detection level and delays the output during the initial operation, the comparison unit and the initial delay unit and the external output unit, and outputs 12V, 6V normally when detecting the gas leakage as the initial delay unit output to the alarm device of the alarm unit And an output level setting section, an adapter to which circuit driving power is applied at this level of normality, and an external output section for transmitting an output to the monitoring device.

Description

Gas Leakage Alarm

1 is a block diagram of the present invention.

2 is a detailed circuit diagram as a specific embodiment of the present invention.

Figure 3 is a block diagram showing an example of the connection of the external output unit of the present invention.

* Explanation of symbols for main parts of the drawings

1: Alarm unit 2: Adapter

3: power supply unit 4: constant voltage unit

5: detection part 6: comparison part

7: Initial delay unit 8: Output level setting unit

9: alarm 9a: oscillator

9b: buzzer alarm comparator 9c: alarm circuit

21 input unit 22 delay unit

23: oscillation unit 24: external output unit

The present invention relates to a gas leakage alarm device, in particular, it is easy to connect the external interlocking device by forming a variety of gas leakage alarm output, gas leakage alarm device made to be accurate driving to prevent malfunction by miscellaneous gas It is about.

In general, gas is regarded as a relatively clean fuel compared to other fuels.

However, gas is one of the unstable fuels that must be handled with great care because it has a property of easily vaporizing and burning in a liquefied state.

These gases act as a major accident factor when leaking, and the cause of leakage is due to the aging of facilities and carelessness of users.

Therefore, various techniques have been proposed to cope with such leakage of gas.

That is, a method of detecting pressure during gas leakage, a method of detecting gas leakage by the generation of bubbles, and a method of detecting a gas concentration in the atmosphere by an electronic sensing device has been proposed.

There is a pressure detection method such as Patent Publication No. 83-1523 as a prior application technology in the technical field, but this technical configuration is that one side of the gas pressure on the one side and the atmospheric pressure on the other side is balanced by adjusting the supply amount of the gas used. As the gas pressure decreases (gas leakage), the atmospheric pressure on the other side comes into contact with the switch contact to give an alarm, and its mechanism is complicated and the pressure balance on both sides should be maintained. Due to the large number of variables such as gas pressure change, it is difficult to use and not accurate.

On the other hand, Practical Announcement No. 86-1294 has been issued, which is to supply power to the gas sensor intermittently to reduce the power consumption, but the intermittent power supply immediately after a certain period of time in the initial operation, the sensor unstable There is a problem that can result.

In addition, in the case of using the electronic sensing element, a gas alarm using a DC power source is used for home automation. However, in this case, the hot wire contact combustion sensing element used in this case has an input current of about 380 mA. However, the input current is limited to a maximum of about 200 mA by connecting various external devices to the home automation. Therefore, in this case, the situation is being used as an unsolvable measure in a state in which a normal gas leakage cannot be performed by dropping the voltage of the thermal wire combustion sensing element.

Dropping the input voltage of such a sensing element results in incomplete gas detection due to malfunction and external temperature and humidity, resulting in a problem that reliability is reduced as a sensing device. As a result, in order to use the sensing device normally, the current of the power supply must be supplied at 380 mA, resulting in a power loss or a large increase. This may be solved by configuring two types of power supply, but in this case, the economic efficiency is greatly reduced.

On the other hand, in the case of using a semiconductor sensing element, the reliability is also degraded due to a malfunction that generates a sensing output for other miscellaneous gases in addition to the sensing target gas.

Therefore, the applicant of the present invention has devised a gas leakage alarm device to Utility Model Application No. 93-2799 to solve all the problems of the prior art as described above, according to the applicant's prior application technology In consideration of the input current of the contact combustion sensing element, the DC input power is increased to a DC-DC converter so that the output is supplied to the sensing element so that a stable sensing output can be obtained even at a low input current. There was no malfunction by constructing an initial delay circuit to cut off the sensing output for a certain period of time, thereby creating a gas leakage alarm device that can generate a stable alarm output and an external output.

The present invention has been devised to complement the above-developed design, includes the purpose of the pre-applied design, and by outputting the gas leakage alarm output for detecting gas leakage at various levels, To facilitate the connection.

The present invention is to provide a gas leakage warning device made to detect the gas leakage detection concentration at about 1/4 of the lower explosion limit concentration, but to eliminate the malfunction caused by the miscellaneous gas by alarm output by the third delay.

The present invention is intended to facilitate the centralized monitoring in a separate centralized monitoring system (disaster prevention system) by implementing an adapter that can transmit the gas leakage detection signal to the gas leakage alarm device.

The present invention is to provide a gas leakage alarm device that can detect the disconnection, power failure of the adapter input line.

The present invention to achieve the above object is the first operation by comparing the detection level with the constant voltage unit consisting of a detection unit for detecting a gas leakage, a constant voltage switching circuit for supplying the detection element power to the detection unit as a hot wire contact combustion detection device A comparison unit for delaying the time output, an initial delay unit and an external output unit, an output level setting unit for outputting 12 V and 6 V during normal gas leakage detection to the alarm device comprising an alarm unit; It consists of an adapter which receives a circuit drive power supply, and an external output part which forms an output to this monitoring apparatus.

Hereinafter, the technical idea of the present invention will be described in detail with reference to the accompanying drawings.

In a gas leakage alarm device comprising an external output as a control output of an external device by detecting gas leakage by detecting an unbalance of a bridge including a hot wire-fired gas detection element, and an alarm circuit for driving an alarm buzzer. And an oscillator 9a for controlling the oscillation neck of the buzzer with the gas leakage detection output, and a comparator for determining an alarm drive of the buzzer with the gas leakage detection output, and a buzzer alarm comparator configured to temporarily delay the alarm driving. An alarm unit 9c comprising an alarm circuit 9c including a buzzer 9b and a buzzer which is switched to an output of the comparator 9b and oscillates and driven to an output of the oscillator 9a, and according to the gas leakage detection output. The output level setting unit 8 is configured to switch the output level to 12V or 6V to constitute the alarm device unit 1, and the output level And from the setting unit received a driving power, by temporarily delaying the gas leakage detection output is formed by the adapter (2) formed to transmit the gas leakage to be output to the external output.

Looking at the configuration as a specific embodiment of the present invention in more detail with reference to FIG. 2 as follows.

The power supply unit 3 is made to provide the required DC power from commercial AC.

A constant voltage unit 4 including a constant voltage switching element U ₂ which is a DC-DC converter from the DC power supply 12V, and a resistance bridge circuit including gas sensing elements S ₁ and S _{2 at an} output end of the constant voltage unit. A detector 5, a comparator 6 made of a comparator U ₁₈ to compare the detector output as a gas leak signal, and a capacitor C ₆ that delays the output of the first sensing element, and outputs the comparator. An initial delay unit 7 including an inverted output NAND gate (U ₃ D) (U ₃ C) and a light emitting diode (LED ₂ ) flashing by the oscillator output, and comparing and outputting the initial delay unit output Comparator (U ₁ A) and a transistor (Q ₅ ) to be driven to the output of the comparator, including a capacitor (C ₇ ) for delaying the comparison input of the comparator (U ₁ A) consisting of an indeterminate alarm comparator ( 9b) and closed by the negative alarm comparison unit and the oscillator output. The alarm circuit 9c including the transistors Q ₂ and Q ₁ and the buzzer BZ and the transistor Q ₃ biased through the base resistor R ₁₈ to the NAND gate U ₃ D output terminal of the initial delay unit. ) And an output terminal OUT ₁ including a transistor Q ₄ driven by a zener diode ZD ₃ and ZD ₂ in a reverse series with the bias voltage level, and the bias voltage level of the transistor Q ₄ . Connect the collector of the transistor (Q ₃ ) between the Zener diodes (ZD ₃ , ZD ₂ ) to form an output level setting section 8 to configure the alarm device (1), the output stage (OUT ₁ ) An input portion 21 comprising a transistor Q ₆ , a resistor R ₂₃ ˜ ₂₆ , a diode D ₅ , and a capacitor C ₈ connected to a zener diode ZD ₄ , the bias voltage of which is limited by the zener diode ZD ₄ ; Inverted NAND gates (U ₄ C, U ₄ C) with a capacitor (C ₉ ) that delays the input output ), An external output unit 24 capable of transmitting a gas leakage signal by connecting an external monitoring device to a delay unit 22, a transistor Q ₇ biased to the delay unit output, and an output terminal OUT of the transistor. ) And an oscillator (2) comprising NAND gates (U ₄ A, U ₄ B) oscillating at the delayed output and an oscillator (23) including a light emitting diode (LED ₃ ) connected in a forward direction to an input power source. .

As the reference numerals, the output terminal OUT ₂ is used as an output terminal of an external device that can be driven at a high low level, and LED ₁ shows a light emitting diode for power display.

Looking at the effect of the present invention as described above in more detail as follows.

First, the gas leakage detection process according to the present invention will be described.

When the commercial AC power is applied, the power supply unit 3 outputs a stable DC power.

Sensing elements S ₁ and S ₂ are driven by the DC power supply, and the sensing elements are supplied with necessary power as a constant voltage switching element U ₂ , which is a DC-DC converter.

Until the first sensing element reaches a stable state, even if there is a comparator (U ₁₈ ) output by a condenser (C ₆ ) which limits the gas leakage detection output or an output due to a malfunction, the NAND gate (U ₃ D) of the initial delay unit (7). The output will be delayed.

On the other hand, the transistor gas leakage is a NAND gate (U ₃ D) in normal, not the detection is presented H output, the transistor (Q ₃₎ of the output level setting portion 8 is turned on by a Zener diode (ZD ₃₎ The ( Since Q ₄ ) is turned on, its output level is about 6V.

The usual output level of 6V is always provided as a power supply to the gas leakage signal transmission adapter 2 to be described later, so that the device connected to the output terminal OUT ₁ can be driven without a separate power supply. will be.

However, when the leakage of the gas is detected, the output of the comparator U ₁₈ is input to the NAND gate U ₃ D and the inverted L output causes the transistor Q ₃ to be turned on. Thus, the zener diodes ZD ₃ and ZD _The bias level is changed by ₂ ) so that the transistor Q ₄ generates an output of about 12V higher than normal. The output terminal OUT ₁ is connected to the input terminal 21 of the adapter 2, and the transistor Q ₆ is biased and turned on based on the zener diode ZD ₄ of the input terminal 21, so that the output corresponding to the gas leakage is turned on. This causes a temporary delay based on the condenser C ₉ of the delay unit 22 to eliminate malfunctions and continuously detects the external output 24 through the NAND gates U ₄ C and U ₄ D when detected continuously. The transistor Q ₇ is turned on to be output.

The output of this transistor Q ₇ allows a conventional sensing device to obtain a remote monitoring output.

At the same time, the light emitting diode LED ₃ which is turned on at 6 V normally displays the gas leakage while being flickered by the oscillation unit 23 oscillating as gas leakage is detected.

On the other hand, when the gas leakage is detected, the NAND gate (U ₃ C) generates an inverted H output, thereby delaying the resistor (R ₃₀ ) at the gas condenser (C ₇ ) temporarily to eliminate the malfunction, to be detected continuously When the comparator U ₁ A is compared and input, when the comparator output is generated, the transistor Q ₅ is turned on and at the same time, the NAND gates U ₄ A and U ₄ B of the oscillator 9a start oscillation. As a result, the light emitting diodes LED ₂ and the transistors Q ₂ are turned on and off in an oscillation cycle, and thus the buzzer BZ also alerts to an intermittent sound.

Meanwhile, when the external output unit 24 is connected to a central monitoring system, which is a general monitoring device, a plurality of alarm device outputs that can be formed in the same area are connected in parallel to each other in a group to be connected to one line of transmission line. As shown in Fig. 3, multiple output terminals (OUT) can be formed in parallel to other adapters so that the wiring of the remote monitoring network can be simplified by group without 1: 1, and gas leakage in the group Confirmation of the detection can be confirmed with the light emitting diode (LED ₃ ). This light emitting diode LED ₃ also has the effect of displaying a disconnection between the neck portion 1 and the adapter 2.

According to the present invention as described in detail above, a multi-stage delay circuit for detecting gas leakage and accuracy of the detection signal is formed to reliably prevent malfunction due to miscellaneous gas, thereby increasing reliability and outputting a gas leakage alarm. It can accommodate various external devices at its output stage and connect the adapter for the output transmission in case of mantissa leakage alarm so that the output can be sent to the centralized monitoring system for easy monitoring and at the same time the normal output level is connected. It is a very practical design with several effects such as power supply and disconnection check.

Claims (4)

In a gas leakage alarm device comprising an external output as a control output of an external device by detecting gas leakage by detecting an unbalance of a bridge including a hot wire-fired gas detection element, and an alarm circuit for driving an alarm buzzer. And an oscillator 9a for controlling the oscillation alarm of the buzzer with the gas leakage detection output, and a comparator for determining an alarm drive of the buzzer with the gas leakage detection output, and a buzzer alarm comparator configured to temporarily delay the alarm operation. An alarm unit 9c comprising an alarm circuit 9c including a buzzer 9b and a buzzer which is switched to an output of the comparator 9b and oscillates and driven to an output of the oscillator 9a, and according to the gas leakage detection output. It is characterized in that the alarm device unit 1 is provided, including an output level setting unit 8 in which the output level is switched to 12V or 6V. Gas leak alarm device with. The method of claim 1, wherein the adapter 2 is configured to obtain driving power from the output level setting unit 8, and to delay the gas leakage detection output to be externally output to transmit the gas leakage output. Gas leakage alarm, characterized in that. The method of claim 1, wherein the alarm device (1) with a constant voltage portion (4) including the constant-voltage switching device (U ₂₎ DC-DC converters from the DC power supply 12V, gas detection to the constant-voltage unit output element (S Detecting unit 5 of the resistance bridge circuit including a ₁ , S ₂ , and the comparison unit 6 of the comparator (U ₁₈ ) and the first sensing element output to delay the output of the detection unit as a gas leakage signal An initial delay unit 7 including a capacitor (C ₆ ) and a NAND gate (U ₃ D) (U ₃ C) for inverting the output of the comparator, and a light emitting diode (LED ₂ ) flashing to the oscillator output. And a comparator (U ₁ A) for comparing and outputting the initial delay unit output, and a transistor (Q ₅ ) configured to be driven by the comparator output, wherein the condenser delays the comparison input of the comparator (U ₁ A). (C ₇₎ formed with a buzzer alarm comparison section (9b), including the buzzer alarm And an alarm circuit (9c) containing the transistors (Q _2, Q ₁₎ and a buzzer (BZ) which is closed by the grant and the oscillating output, the initial delay base resistor (R ₁₈₎ a NAND gate (U ₃ D) output terminal portion a Zener diode of a transistor (Q ₃₎ and a reverse series is biased through (ZD _3, ZD ₂₎ by being made to the output terminal (OUT ₁₎ including a transistor (Q ₄₎ which is set a bias voltage level driver, said transistor ( And an output level setting unit (8) by connecting the collector of the transistor (Q ₃ ) between the Zener diodes (ZD ₃ , ZD ₂ ) to vary the bias voltage level of Q ₄ ). The transistor Q ₆ and the resistor R ₂₃ to ₂₆ , wherein the adapter 2 is connected to the output terminal OUT ₁ and the bias voltage is limited by the zener diode ZD ₄ . ), An input unit 21 composed of a diode D ₅ and a capacitor C ₈ , and a delay composed of an inverted NAND gate U ₄ C, U ₄ D including a capacitor C ₉ for delaying the output of the input unit. An external output unit 24 capable of transmitting a gas leakage signal by connecting a unit 22, a transistor Q ₇ biased to the delay unit output, and an external monitoring device to the output terminal OUT of the transistor; Gas leakage characterized in that it consists of an adapter (2) consisting of the oscillation unit 23 including the NAND gate (U ₄ A, U ₄ B) oscillating with the delay output and the light emitting diode (LED ₃ ) connected in the forward direction to the input power source Alarm device.