CN113611086A - Safety detection system for gas boiler room - Google Patents
Safety detection system for gas boiler room Download PDFInfo
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- CN113611086A CN113611086A CN202110978914.5A CN202110978914A CN113611086A CN 113611086 A CN113611086 A CN 113611086A CN 202110978914 A CN202110978914 A CN 202110978914A CN 113611086 A CN113611086 A CN 113611086A
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/02—Alarms for ensuring the safety of persons
- G08B21/12—Alarms for ensuring the safety of persons responsive to undesired emission of substances, e.g. pollution alarms
- G08B21/16—Combustible gas alarms
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0062—General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method, e.g. intermittent, or the display, e.g. digital
- G01N33/0063—General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method, e.g. intermittent, or the display, e.g. digital using a threshold to release an alarm or displaying means
- G01N33/0065—General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method, e.g. intermittent, or the display, e.g. digital using a threshold to release an alarm or displaying means using more than one threshold
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0073—Control unit therefor
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
- G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
- G08B25/10—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using wireless transmission systems
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
- G08B29/18—Prevention or correction of operating errors
- G08B29/185—Signal analysis techniques for reducing or preventing false alarms or for enhancing the reliability of the system
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
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Abstract
The invention discloses a safety detection system for a gas boiler room, which effectively solves the problems that a fire alarm device in the prior art has more and longer laid buses and the rescue time of the gas boiler room is greatly wasted when a monitoring center judges and analyzes gas signals, and comprises a signal acquisition module, a signal judgment module, an emergency alarm module, a signal transmission module and a monitoring center, wherein the signal acquisition module acquires gas signals in the gas boiler room and transmits the gas signals to the signal judgment module for judgment, when the amplitude of the gas signals is higher than the threshold value of the signal judgment module, the signal judgment module starts the emergency alarm module, simultaneously wirelessly transmits the alarm signals to the monitoring center through the signal transmission module, and a signal processing circuit is arranged between the signal judgment module and the signal transmission module, thereby realizing the protection of the gas boiler room.
Description
Technical Field
The invention relates to the field of gas boiler room detection, in particular to a gas boiler room safety detection system.
Background
Boiler rooms are arranged in some industrial and civil buildings, wherein natural gas boiler rooms are used for a large number of buildings, the gas boiler rooms (the schematic diagram is shown in figure 1, and 1 is a movable natural gas boiler room) belong to dependent boiler rooms, so certain fire hazard exists in the places of the dependent boiler rooms, and a fire alarm device is arranged for the dependent boiler rooms according to the regulation of GB 50016-2014' fire protection code for building design.
Therefore, the fire alarm device is designed in the prior art, the fire alarm device is connected with a monitoring center bus in a park, but the fire alarm device is only suitable for being installed in places with short distance between a gas boiler room and the monitoring center and with small number of gas boiler rooms, otherwise, the problem that the laid bus is large and long occurs, resources are wasted, and in the prior art, the fire alarm device is arranged in the gas boiler room, but the fire alarm device is started by the monitoring center, if the signal acquisition module detects that the concentration of certain gas exceeds a threshold value, the monitoring center is required to start the fire alarm device on site to enable workers on site to rescue, and the rescue time of the gas boiler room is greatly wasted.
The present invention therefore provides a new solution to this problem.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a safety detection system for a gas boiler room, which effectively solves the problems that in the fire alarm device in the prior art, more and longer buses are laid, and the rescue time for the gas boiler room is greatly wasted when a monitoring center judges and analyzes gas signals.
The technical scheme of its solution is, a gas boiler room safety detection system, safety detection system includes signal acquisition module, signal judgment module, emergency alarm module, signal transmission module, surveillance center, the gas signal in the gas boiler room is gathered to signal acquisition module to judge gas signal transmission to signal judgment module, when gas signal's amplitude is higher than the threshold value of signal judgment module, signal judgment module starts emergency alarm module, passes through signal transmission module wireless transmission to surveillance center with alarm signal simultaneously.
Further, the gas signals collected by the signal collection module comprise CO gas signals and SO gas signals2Gas signal, H2S gas signal, CO2A gas signal.
Furthermore, a signal processing circuit is further arranged between the signal judgment module and the signal transmission module and comprises a signal receiving circuit and a signal output circuit, the signal receiving circuit receives the alarm signal output by the signal judgment module, the alarm signal is transmitted to the signal output circuit after passing through the receiver and the frequency selector, and the signal output circuit transmits the alarm signal to the signal transmission module after passing through the compensator and the frequency modulator.
Furthermore, the signal receiving circuit comprises a receiver and a frequency selector, the receiver receives the alarm signal, the frequency selector is used for selecting the frequency of the alarm signal, and the alarm signal after frequency selection is transmitted to the signal transmission circuit.
Further, the receiver includes a diode D2, the anode of the diode D2 is connected to one end of a resistor R1, one end of a bipolar TVS diode D1, and a signal determination module, the other end of the resistor R1 is connected to the upper end of an adjustable resistor R2, the lower end of the adjustable resistor R2 is connected to the other end of the bipolar TVS diode D1, the adjustable end of the adjustable resistor R2, and one end of a capacitor C1, the other end of the diode D2 is connected to one end of a resistor R4, one end of the resistor R5, and the base of a transistor Q2, the other end of the resistor R4 is connected to one end of the resistor R3 and the base of a transistor Q1, the collector of the transistor Q1 is connected to the other end of the resistor R3, the cathode of the diode D3, the emitter of the transistor Q1 is connected to the emitter of the transistor Q2 and one end of the capacitor C2, and the collector of the transistor Q2 is connected to one end of the resistor R5, The other end of the capacitor C1 and the positive electrode of the diode D4 are connected in parallel to ground, and the other end of the capacitor C2 is connected to the positive electrode of the diode D3 and the negative electrode of the diode D4, respectively.
Further, the frequency selector includes a resistor R7, one end of the resistor R7 is connected to the other end of a capacitor C2, the cathode of a diode D4, and the anode of a diode D3 in the receiver, the other end of the resistor R7 is connected to the non-inverting terminal of the operational amplifier U1B, one end of a resistor R11, one end of a resistor R10, and the source of the fet Q3, the inverting terminal of the operational amplifier U1 3 is connected to one end of the resistor R3, the output terminal of the operational amplifier U1 3 is connected to the other end of the resistor R3, one end of the resistor R3, and one end of the capacitor C3, the other end of the resistor R3 is connected to one end of the capacitor C3, the other end of the capacitor C3 is connected to the inverting terminal of the operational amplifier U2 3, one end of the resistor R3, the other end of the resistor R3, and one end of the resistor R3, and the other end of the amplifier R3 are connected to the inverting terminal of the capacitor C3, and the other end of the capacitor R3, respectively, The other end of the resistor R12, the other end of the resistor R10, the other end of the resistor R8 and the collector of the triode Q2 in the receiver are connected in parallel and grounded, the output end of the operational amplifier U2B is respectively connected with the other end of the resistor R9, one end of the resistor R6 and the grid of the field-effect transistor Q3, and the drain of the field-effect transistor Q3 is respectively connected with the other end of the resistor R6 and the cathode of the diode D3 in the receiver and is connected with the positive power supply VCC.
Furthermore, the signal output circuit comprises a compensator and a frequency modulator, the compensator receives the alarm signal output by the signal receiving circuit and compensates the alarm signal, the frequency modulator is used for modulating the frequency of the alarm signal, and the modulated alarm signal is output to the signal transmission module.
Furthermore, the compensator comprises a resistor R20, one end of the resistor R20 is respectively connected with the output end of an operational amplifier U1B in the signal receiving circuit, one end of a resistor R17 and one end of a capacitor C5, the other end of the resistor R20 is respectively connected with one end of a resistor R19 and the grid of a MOS transistor Q5, the drain of the MOS transistor Q5 is respectively connected with one end of a resistor R18 and the grid of a field effect transistor Q4, the drain of the field effect transistor Q4 is respectively connected with one end of the resistor R14, the source of the field effect transistor Q4 is respectively connected with the cathode of a voltage regulator D5 and one end of a resistor R15, the anode of the voltage regulator D5 is respectively connected with the source of the field effect transistor Q5 and the other end of the resistor R12 in the signal receiving circuit and connected in parallel to the ground, the other end of the resistor R19 is connected to the other end of the resistor R18, the other end of the resistor R15, the other end of the resistor R14, and the cathode of the diode D3 in the signal receiving circuit, respectively, and is connected to the positive power source VCC.
Further, the frequency modulator includes a capacitor C6, one end of the capacitor C6 is connected to the drain of the fet Q4 in the compensator, the other end of the capacitor C6 is connected to one end of a resistor R21, the anode of a diode D6, one end of a resistor R24, one end of a capacitor C7, and the gate of the fet Q6, the drain of the fet Q6 is connected to one end of a variable capacitor C10, one end of a resistor R23, one end of a variable inductor L2, the other end of a resistor R24, the cathode of a regulator D7, one end of a resistor R26, one end of a capacitor C8, and one end of an inductor L1, the source of the fet Q6 is connected to one end of a resistor R6, the other end of the variable capacitor C6 is connected to the other end of the resistor R6, the other end of the variable inductor L6, the other end of the resistor R6 is connected to the positive polarity power supply R6 in the compensator, the other end of the resistor R25 is connected with the other end of the capacitor C7, the cathode of the diode D6, the anode of the voltage regulator tube D7, the other end of the resistor R26, the other end of the capacitor C8, one end of the variable capacitor C9 and the source of the MOS tube Q5 in the compensator respectively, and the other end of the inductor L1 is connected with the other end of the variable capacitor C9 and the signal transmission module respectively.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages:
(1) the amplitude of the gas signal is compared with the set threshold value through the signal judgment module, the emergency alarm module is started through the signal judgment module, timely reminding of workers on site is achieved, the phenomenon of rescue time waste caused when a monitoring center is used for judging and analyzing the gas signal is avoided, the alarm signal is sent to the monitoring center through the signal transmission module in a wireless transmission mode, and the phenomenon that more and long buses are laid when the number of gas boiler rooms is large and the distance from the monitoring center is long and the phenomenon of resource waste is avoided;
(2) the signal processing circuit is arranged between the signal judgment module and the signal transmission module, the frequency selector and the frequency modulator are used for carrying out frequency selection and frequency modulation processing on the alarm signal, the compensator is used for carrying out frequency selection on the alarm signal, loss caused by frequency selection is compensated, the situation that when a gas boiler room is arranged in a civil building, other transmitted signals in the civil building are more, for example, signals wirelessly transmitted by mobile phones or computers held by residents, the electromagnetic environment of a place where the gas boiler room is located is complex, interference is caused on the alarm signal output by the signal judgment module, the influence on the accuracy of the alarm signal is avoided, and the accuracy of analyzing the signal by a monitoring center is also avoided.
Drawings
FIG. 1 is a schematic structural diagram of a gas boiler room.
Fig. 2 is a schematic circuit diagram of the present invention.
Detailed Description
The foregoing and other technical and functional aspects of the present invention will be apparent from the following detailed description of the embodiments, which proceeds with reference to the accompanying figures 1-2. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
A safety detection system of a gas boiler room is applied to the interior of the gas boiler room and comprises a signal acquisition module, a signal judgment module, an emergency alarm module, a signal transmission module and a monitoring center, wherein the signal acquisition module acquires gas signals in the gas boiler room and transmits the gas signals to the signal judgment module for judgment;
the gas signals collected by the signal collection module comprise CO gas signals and SO2Gas signal, H2S gas signal, CO2The gas signal and the like, a corresponding gas sensor is arranged aiming at the gas signals to collect the gas signals, a threshold value set by the signal judgment module is set aiming at each gas, when the amplitude of one gas signal exceeds the threshold value, the signal judgment module starts the emergency alarm module and simultaneously outputs an alarm signal to the signal transmission module, wherein the alarm signal is an analog alternating current signal;
the emergency alarm module is used for reminding field workers of carrying out emergency rescue work on the gas boiler room.
However, in the actual use process, it is found that when the gas boiler room is arranged in a civil building, other signals transmitted in the civil building are more, such as signals wirelessly transmitted by a mobile phone or a computer held by a resident, and a local electromagnetic environment where the gas boiler room is located is complicated, and interference is caused on the alarm signal output by the signal judgment module, so that the accuracy of the alarm signal is greatly influenced, and the accuracy of the analysis of the signal by the monitoring center is influenced;
therefore, a signal processing circuit is arranged between the signal judgment module and the signal transmission module and comprises a signal receiving circuit and a signal output circuit, the signal receiving circuit receives the alarm signal output by the signal judgment module, the alarm signal is transmitted to the signal output circuit after passing through a receiver and a frequency selector, and the signal output circuit transmits the alarm signal to the signal transmission module after passing through a compensator and a frequency modulator;
the receiver comprises a diode D2, the anode of the diode D2 is respectively connected with one end of a resistor R1, one end of a bipolar TVS diode D1 and a signal judgment module, the other end of the resistor R1 is connected with the upper end of an adjustable resistor R2, the lower end of the adjustable resistor R2 is respectively connected with the other end of the bipolar TVS diode D1, the adjustable end of the adjustable resistor R2 and one end of a capacitor C1, the other end of the diode D2 is respectively connected with one end of a resistor R4, one end of the resistor R5 and the base of a triode Q2, the other end of the resistor R4 is respectively connected with one end of a resistor R3 and the base of a triode Q1, the collector of the triode Q1 is respectively connected with the other end of a resistor R3 and the cathode of a diode D3 and is connected with a positive polarity power supply VCC, the emitter of the triode Q1 is respectively connected with the emitter of a triode Q2 and one end of a capacitor C2, the collector of a triode Q2 is respectively connected with one end of a resistor R5 and the other end of a capacitor C1, The anode of the diode D4 is connected in parallel with the ground, and the other end of the capacitor C2 is connected with the anode of the diode D3 and the cathode of the diode D4 respectively;
the frequency selector comprises a resistor R7, one end of the resistor R7 is connected with the other end of a capacitor C2, the cathode of a diode D4 and the anode of a diode D3 in the receiver, the other end of the resistor R7 is connected with the in-phase end of an operational amplifier U1B, one end of a resistor R11, one end of a resistor R10 and the source of a field effect transistor Q3, the inverting end of the operational amplifier U1 3 is connected with one end of the resistor R3, the output end of the operational amplifier U1 3 is connected with the other end of the resistor R3, one end of the resistor R3 and one end of the capacitor C3, the other end of the resistor R3 is connected with one end of the capacitor C3 and one end of the resistor R3, the other end of the capacitor C3 is connected with the inverting end of the operational amplifier U2 3, one end of the in-phase end of the operational amplifier U2 3, the other end of the resistor R3 and one end of the resistor R3, and the other end of the resistor R3 are connected with the other end of the capacitor R3 in the capacitor C3, and the capacitor R3 in the receiver, and the inverting end of the operational amplifier R3 are connected with the inverting end of the capacitor C3, The other end of the resistor R12, the other end of the resistor R10, the other end of the resistor R8 and the collector of a triode Q2 in the receiver are connected in parallel and grounded, the output end of the operational amplifier U2B is respectively connected with the other end of the resistor R9, one end of the resistor R6 and the grid of a field-effect tube Q3, the drain of the field-effect tube Q3 is respectively connected with the other end of the resistor R6 and the cathode of a diode D3 in the receiver and is connected with a positive power supply VCC;
the signal receiving circuit comprises a receiver and a frequency selector, the receiver detects the amplitude of the alarm signal output by the signal judging module by using a bipolar TVS diode D1 to avoid the surge phenomenon of the signal processing circuit caused by the overlarge amplitude of the alarm signal, when the amplitude of the alarm signal is overlarge, the bipolar TVS diode D1 is discharged to the ground through a resistor R1, an adjustable resistor R2 and a capacitor C2, then the alarm signal is transmitted to a triode Q1 and a triode Q2 through a diode D2 to be processed, the cross distortion of the alarm signal is avoided, the response capability of the signal processing circuit is improved, the triode Q1 and a triode Q2 transmit the alarm signal to the frequency selector through a capacitor C2, the diode D3 and the diode D4 are used for limiting the amplitude of the alarm signal within 0V-5V, the control of the amplitude of the alarm signal is realized, and in order to avoid other signals transmitted in civil buildings from being mixed with the alarm signal, the alarm signal accuracy is affected, the alarm signal is subjected to frequency selection by using an operational amplifier U1B, a capacitor C5, a resistor R16, a capacitor C3, a resistor R13, a resistor R17, a capacitor C5, an operational amplifier U2B, a resistor R11 and a field effect transistor Q3, in order to avoid poor frequency selection effect caused by too low Q value when the alarm signal is subjected to frequency selection, the capacitor C5, the resistor R16, the capacitor C3, the resistor R13, the resistor R17, the capacitor C5, the operational amplifier U2B, the resistor R11 and the field effect transistor Q3 are used as a feedback network of the operational amplifier U1B, the frequency of the alarm signal is selected, the alarm signal is followed by using the field effect transistor Q3, and the operational amplifier U1B is used as a load, so that the Q value of the frequency selector is further improved, and the open-loop gain of the operational amplifier U1B is also improved, and the alarm signal is transmitted to the signal output circuit.
The compensator comprises a resistor R20, one end of a resistor R20 is connected with the output end of an operational amplifier U1B, one end of a resistor R17 and one end of a capacitor C5 in the signal receiving circuit respectively, the other end of the resistor R20 is connected with one end of a resistor R19 and the grid of an MOS tube Q5 respectively, the drain of the MOS tube Q5 is connected with one end of a resistor R18 and the grid of a field effect tube Q4 respectively, the drain of the field effect tube Q4 is connected with one end of a resistor R14 respectively, the source of the field effect tube Q4 is connected with the negative electrode of a voltage regulator D5 and one end of a resistor R15 respectively, the positive electrode of the voltage regulator D5 is connected with the source of the field effect tube Q5 and the other end of a resistor R12 in the signal receiving circuit in parallel connection with the ground, the other end of the resistor R19 is connected with the other end of a resistor R18, the other end of a resistor R15, the other end of the resistor R14 and the negative electrode of a diode D3 in the signal receiving circuit and connected with a positive power supply VCC;
the frequency modulator comprises a capacitor C6, one end of the capacitor C6 is connected with a drain of a field effect transistor Q4 in the compensator, the other end of the capacitor C6 is respectively connected with one end of a resistor R21, an anode of a diode D6, one end of a resistor R24, one end of a capacitor C7 and a gate of a field effect transistor Q6, a drain of the field effect transistor Q6 is respectively connected with one end of a variable capacitor C10, one end of a resistor R23, one end of a variable inductor L2, the other end of the resistor R2, a cathode of a voltage regulator D2, one end of the resistor R2, one end of the capacitor C2 and one end of the inductor L2, a source of the field effect transistor Q2 is connected with one end of the resistor R2, the other end of the variable capacitor C2 is respectively connected with the other end of the resistor R2 and a positive polarity power supply VCC in the compensator, one end of the resistor R2 is respectively connected with the other end of the resistor R2, and the other end of the resistor R2 is connected with the positive polarity power supply VCC in the compensator, The negative electrode of the diode D6, the positive electrode of the voltage regulator tube D7, the other end of the resistor R26, the other end of the capacitor C8, one end of the variable capacitor C9 and the source electrode of the MOS tube Q5 in the compensator are connected and grounded, and the other end of the inductor L1 is connected with the other end of the variable capacitor C9 and the signal transmission module respectively;
the signal output circuit comprises a compensator and a frequency modulator, wherein the compensator transmits an alarm signal to an MOS tube Q5 and a field effect tube Q4 by using a resistor R20 to amplify by 1-2 times, realizes compensation after frequency selection of the alarm signal by using a frequency selector in a signal receiving circuit, avoids loss caused by the alarm signal during frequency selection and influences transmission of the alarm signal, realizes control of amplitude of the alarm signal during amplification by using the MOS tube Q5 and the field effect tube Q4 by using a voltage stabilizing tube D5, transmits the alarm signal output by the MOS tube Q5 and the field effect tube Q4 to the frequency modulator, and utilizes a capacitor C6 to couple the alarm signal to the field effect tube Q6, the field effect tube Q6, the capacitor C7, a variable inductor L2, a variable capacitor C10, a resistor R23, a resistor R26 and a resistor R25 to modulate the frequency of the alarm signal so as to increase anti-interference capability of the alarm signal and avoid influence of other alarm signals transmitted in civil buildings on the alarm signal, the alarm signal is subjected to impedance matching through the capacitor C8, the variable capacitor C9 and the inductor L1, so that the phenomenon that the alarm signal generates reflection interference due to impedance mismatching of the signal processing circuit and the signal transmission module, the accuracy of the alarm signal is influenced, and the analysis of the alarm signal by a monitoring center is also influenced is avoided.
When the gas boiler is used specifically, the signal acquisition module acquires a gas signal in a gas boiler room and transmits the gas signal to the signal judgment module for judgment, when the amplitude of the gas signal is higher than the threshold value of the signal judgment module, the signal judgment module starts the emergency alarm module, and simultaneously, the alarm signal is wirelessly transmitted to a monitoring center through the signal transmission module, a signal processing circuit is arranged between the signal judgment module and the signal transmission module, the signal processing circuit comprises a signal receiving circuit and a signal output circuit, the signal receiving circuit comprises a receiver and a frequency selector, the receiver detects the amplitude of the alarm signal output by the signal judgment module by using a bipolar TVS diode D1, a resistor R1, an adjustable resistor R2 and a capacitor C2 to avoid the amplitude of the alarm signal from being too large, and then the alarm signal is transmitted to a triode Q1 and a triode Q2 through the diode D2 to be processed, the response capability of the signal processing circuit is improved, the amplitude of the alarm signal is limited within 0V-5V by using a diode D3 and a diode D4, the control of the amplitude of the alarm signal is realized, the frequency selector selects the frequency of the alarm signal by using an operational amplifier U1B, a capacitor C5, a resistor R16, a capacitor C3, a resistor R13, a resistor R17, a capacitor C5, an operational amplifier U2B, a resistor R11 and a field effect tube Q3, the frequency of the alarm signal is selected, other signals transmitted in a civil building are prevented from being mixed on the alarm signal and influencing the accuracy of the alarm signal, the alarm signal is transmitted to a signal output circuit at the moment, the signal output circuit comprises a compensator and a frequency modulator, the compensator amplifies the alarm signal by using a MOS tube Q5 and a field effect tube Q4, the alarm signal output by the MOS tube Q5 and the field effect tube Q4 is transmitted to the frequency modulator, and is coupled to the field effect tube Q6 by using a capacitor C6, the field-effect transistor Q6, the capacitor C7, the variable inductor L2, the variable capacitor C10, the resistor R23, the resistor R26 and the resistor R25 are used for carrying out frequency modulation on the alarm signal, so that the anti-jamming capability of the alarm signal is improved, the influence of other signals transmitted in the civil building on the alarm signal is avoided, the impedance matching of the alarm signal is carried out through the capacitor C8, the variable capacitor C9 and the inductor L1, the impedance mismatching of a signal processing circuit and a signal transmission module is avoided, the reflection interference of the alarm signal is caused, the accuracy of the alarm signal is influenced, and the analysis of the alarm signal by a monitoring center is also influenced.
(1) The amplitude of the gas signal is compared with the set threshold value through the signal judgment module, the emergency alarm module is started through the signal judgment module, timely reminding of workers on site is achieved, the phenomenon of rescue time waste caused when a monitoring center is used for judging and analyzing the gas signal is avoided, the alarm signal is sent to the monitoring center through the signal transmission module in a wireless transmission mode, and the phenomenon that more and long buses are laid when the number of gas boiler rooms is large and the distance from the monitoring center is long and the phenomenon of resource waste is avoided;
(2) the signal processing circuit is arranged between the signal judgment module and the signal transmission module, the frequency selector and the frequency modulator are used for carrying out frequency selection and frequency modulation processing on the alarm signal, the compensator is used for carrying out frequency selection on the alarm signal, loss caused by frequency selection is compensated, the situation that when a gas boiler room is arranged in a civil building, other transmitted signals in the civil building are more, for example, signals wirelessly transmitted by mobile phones or computers held by residents, the electromagnetic environment of a place where the gas boiler room is located is complex, interference is caused on the alarm signal output by the signal judgment module, the influence on the accuracy of the alarm signal is avoided, and the accuracy of analyzing the signal by a monitoring center is also avoided.
Claims (9)
1. The utility model provides a gas boiler room safety detection system, its characterized in that, safety detection system includes signal acquisition module, signal judgment module, emergency alarm module, signal transmission module, surveillance center, the gas signal in the gas boiler room is gathered to signal acquisition module to judge gas signal transmission to signal judgment module, when gas signal's amplitude is higher than the threshold value of signal judgment module, signal judgment module starts emergency alarm module, passes through signal transmission module wireless transmission to surveillance center with alarm signal simultaneously.
2. The gas-fired boiler room safety detection system as recited in claim 1, wherein the gas signal collected by the signal collection module comprises a CO gas signal and a SO gas signal2Gas signal, H2S gas signal, CO2A gas signal.
3. The gas-fired boiler room safety detection system of claim 1, wherein a signal processing circuit is further disposed between the signal judgment module and the signal transmission module, the signal processing circuit includes a signal receiving circuit and a signal output circuit, the signal receiving circuit receives the alarm signal output by the signal judgment module, the alarm signal is transmitted to the signal output circuit after passing through the receiver and the frequency selector, and the signal output circuit transmits the alarm signal to the signal transmission module after passing through the compensator and the frequency modulator.
4. The gas-fired boiler room safety detection system of claim 3, wherein the signal receiving circuit comprises a receiver and a frequency selector, the receiver receives the alarm signal, the frequency selector is used for selecting the frequency of the alarm signal, and the alarm signal after frequency selection is transmitted to the signal transmission circuit.
5. The system as claimed in claim 4, wherein the receiver includes a diode D2, the anode of the diode D2 is connected to one end of a resistor R1, one end of a bipolar TVS diode D1 and the signal determination module, the other end of the resistor R1 is connected to the upper end of an adjustable resistor R2, the lower end of the adjustable resistor R2 is connected to the other end of the bipolar TVS diode D1, the adjustable end of the adjustable resistor R2 and one end of a capacitor C1, the other end of the diode D2 is connected to one end of a resistor R4, one end of a resistor R5 and the base of a transistor Q2, the other end of a resistor R4 is connected to one end of a resistor R3 and the base of a transistor Q1, the collector of the transistor Q1 is connected to the other end of a resistor R3 and the cathode of a diode D3 and the positive polarity power source VCC, the emitter of the transistor Q1 is connected to the emitter of a transistor Q2 and the emitter of the transistor Q493Q 3, One end of a capacitor C2, a collector of a triode Q2 are respectively connected with one end of a resistor R5, the other end of the capacitor C1 and the anode of a diode D4 and are connected with the ground, and the other end of a capacitor C2 is respectively connected with the anode of a diode D3 and the cathode of a diode D4.
6. The safety detection system for the gas-fired boiler room as claimed in claim 4, wherein the frequency selector comprises a resistor R7, one end of the resistor R7 is connected with the other end of a capacitor C2, the negative electrode of a diode D4 and the positive electrode of a diode D3 in the receiver, the other end of the resistor R7 is connected with the in-phase end of an operational amplifier U1B, one end of a resistor R11, one end of a resistor R10 and the source of a field effect transistor Q3, the inverting end of the operational amplifier U1B is connected with one end of a resistor R8, the output end of the operational amplifier U1B is connected with the other end of a resistor R11, one end of a resistor R2 and one end of a capacitor C8269556, the other end of a resistor R17 is connected with one end of a capacitor C4 and one end of a resistor R13, the other end of a capacitor C367 is connected with one end of a capacitor C3, one end of a resistor R16, the other end of a capacitor C16 is connected with the inverting end of an operational amplifier U2U 16 and the other end of a resistor R16, One end of a resistor R12, one end of a resistor R9, the other end of a resistor R16 is respectively connected with the other end of a capacitor C4, the other end of a resistor R12, the other end of a resistor R10, the other end of a resistor R8 and a collector of a triode Q2 in the receiver and connected with the ground in parallel, the output end of an operational amplifier U2B is respectively connected with the other end of a resistor R9, one end of the resistor R6 and a gate of a field-effect tube Q3, and a drain of the field-effect tube Q3 is respectively connected with the other end of a resistor R6 and a cathode of a diode D3 in the receiver and connected with a positive power supply VCC.
7. The gas-fired boiler room safety detection system of claim 3, wherein the signal output circuit comprises a compensator and a frequency modulator, the compensator receives the alarm signal output by the signal receiving circuit and compensates the alarm signal, the frequency modulator is used for modulating the frequency of the alarm signal, and the modulated alarm signal is output to the signal transmission module.
8. The safety detection system for the gas-fired boiler room as claimed in claim 7, wherein said compensator comprises a resistor R20, one end of a resistor R20 is connected to the output end of an operational amplifier U1B, one end of a resistor R17 and one end of a capacitor C5 in the signal receiving circuit, the other end of a resistor R20 is connected to one end of a resistor R19 and the gate of a MOS transistor Q5, the drain of the MOS transistor Q5 is connected to one end of a resistor R18 and the gate of a field effect transistor Q4, the drain of the field effect transistor Q4 is connected to one end of the resistor R14, the source of the field effect transistor Q4 is connected to the negative electrode of a regulator D5 and one end of a resistor R15, the positive electrode of the regulator D5 is connected to the source of the field effect transistor Q5 and the other end of a resistor R12 in the signal receiving circuit are grounded, the other end of a resistor R19 is connected to the other end of the resistor R18, the other end of the resistor R15 and the resistor R14 in parallel connection, The cathode of the diode D3 in the signal receiving circuit is connected to a positive polarity power supply VCC.
9. The safety detection system for a gas-fired boiler room as claimed in claim 7, wherein the frequency modulator includes a capacitor C6, one end of the capacitor C6 is connected to a drain of a FET Q4 in the compensator, the other end of the capacitor C6 is connected to one end of a resistor R21, an anode of a diode D6, one end of a resistor R24, one end of a capacitor C7, and a gate of a FET Q6, a drain of a FET Q6 is connected to one end of a variable capacitor C10, one end of a resistor R23, one end of a variable inductor L2, the other end of a resistor R24, a cathode of a regulator D7, one end of a resistor R26, one end of a capacitor C8, and one end of an inductor L1, a source of a FET Q6 is connected to one end of a resistor R6, the other end of a variable capacitor C6 is connected to the other end of the resistor R6, the other end of the variable inductor R6, the other end of the resistor R6 is connected to a positive polarity of a power supply of the compensator R6, the other end of the resistor R25 is connected with the other end of the capacitor C7, the cathode of the diode D6, the anode of the voltage regulator tube D7, the other end of the resistor R26, the other end of the capacitor C8, one end of the variable capacitor C9 and the source of the MOS tube Q5 in the compensator respectively, and the other end of the inductor L1 is connected with the other end of the variable capacitor C9 and the signal transmission module respectively.
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