CN113611087A - Movable gas boiler room alarm system - Google Patents
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- CN113611087A CN113611087A CN202110978919.8A CN202110978919A CN113611087A CN 113611087 A CN113611087 A CN 113611087A CN 202110978919 A CN202110978919 A CN 202110978919A CN 113611087 A CN113611087 A CN 113611087A
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- 230000008054 signal transmission Effects 0.000 claims abstract description 29
- 239000003990 capacitor Substances 0.000 claims description 107
- 230000005669 field effect Effects 0.000 claims description 33
- 230000005540 biological transmission Effects 0.000 claims description 4
- 239000007789 gas Substances 0.000 description 52
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 16
- 230000000087 stabilizing effect Effects 0.000 description 10
- 239000003345 natural gas Substances 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 3
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- 241000273930 Brevoortia tyrannus Species 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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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 or the display, e.g. intermittent measurement or digital display
- G01N33/0063—General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method or the display, e.g. intermittent measurement or digital display 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 or the display, e.g. intermittent measurement or digital display 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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Abstract
The invention discloses a movable gas boiler room alarm system, which effectively solves the problem that the auxiliary work of the movable gas boiler room provided by the prior art during the assembly and disassembly is invisibly increased, and comprises a signal acquisition module, a signal judgment module, an emergency alarm module, a signal transmission module and a monitoring center, the signal acquisition module acquires gas signals in the movable gas boiler room and transmits the gas signals 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, meanwhile, the emergency alarm module generates an alarm signal, and the alarm signal is wirelessly transmitted to the monitoring center through the signal transmission module, so that the auxiliary work of building and disassembling the movable gas boiler room is greatly reduced.
Description
Technical Field
The invention relates to the field of raw coal bunkers, in particular to a movable gas boiler room alarm 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 belong to non-independent boiler rooms, so that certain fire hazard exists in the places of the non-independent boiler rooms, and a fire alarm device is arranged for the non-independent boiler rooms according to the regulation of GB50016-2014 'architectural design fire prevention specification'.
In the prior art, the gas boiler rooms are divided into a fixed type and a movable type, the movable type natural gas boiler room (a schematic diagram is shown in fig. 1, wherein 1 is the movable type natural gas boiler room) is generally used for temporarily constructed engineering or emergency situations, a plurality of movable type natural gas boiler rooms are required for general large-scale engineering, when the movable type natural gas boiler room is constructed, cables need to be laid for signal transmission and operation monitoring, different engineering terrains and construction modes of the movable type natural gas boiler room are different, the laying modes of the cables and the lengths of the required cables are different, the movable type natural gas boiler room is disassembled, a large number of cables need to be collected and transported for next use, and the auxiliary work of the movable type natural gas boiler room is invisibly increased.
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 movable gas boiler room alarm system, which effectively solves the problem that the auxiliary work of the movable gas boiler room in the prior art is invisibly increased during the assembly and disassembly.
The technical scheme of its solution is, a movable gas boiler room alarm system, alarm system includes signal acquisition module, signal judgment module, emergency alarm module, signal transmission module, surveillance center, the gas signal in the movable 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, and emergency alarm module produces alarm signal simultaneously, and alarm signal passes through signal transmission module wireless transmission to surveillance center.
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, the signal processing circuit comprises a signal receiving circuit and a signal output circuit, the signal receiving circuit receives the alarm signal output by the emergency alarm module, the alarm signal is transmitted to the signal output circuit after passing through the frequency selector and the buffer, and the signal output circuit transmits the alarm signal to the signal transmission module after passing through the compensator and the output device.
Furthermore, the signal receiving circuit comprises a frequency selector and a buffer, wherein the frequency selector receives and selects the frequency of the alarm signal output by the emergency alarm module, and transmits the alarm signal subjected to frequency selection to the signal output circuit after the buffer performs buffer processing on the alarm signal subjected to frequency selection.
Further, the frequency selector includes an inductor L1, one end of the inductor L1 is connected to the emergency alarm module, the other end of the inductor L1 is connected to the anode of the varactor diode D1, one end of the capacitor C1, and one end of the resistor R1, the other end of the resistor R1 is connected to the inverting terminal of the operational amplifier U1B, one end of the resistor R3, one end of the resistor R8, and the source of the fet Q1, the inverting terminal of the operational amplifier U1B is connected to one end of the resistor R2, the output terminal of the operational amplifier U2B is connected to the other end of the resistor R3, one end of the resistor R5, and one end of the capacitor C5, the other end of the resistor R5 is connected to one end of the resistor R5, one end of the operational amplifier U2 is connected to one end of the capacitor C5 and one end of the resistor R5, the other end of the resistor R5 is connected to the other end of the capacitor C5, one end of the operational amplifier U2, and the inverting terminal of the operational amplifier U5, One end of a resistor R6, the output end of an operational amplifier U2B are respectively connected with one end of a resistor R7, the other end of the operational amplifier R6 and the grid electrode of a field effect transistor Q1, the drain electrode of the field effect transistor Q1 is connected with the other end of a resistor R7 and is connected with a positive power supply VCC, the other end of the resistor R9 is respectively connected with the other end of the resistor R8, the other end of a resistor R4, the other end of a capacitor C2, the other end of a resistor R2, the other end of the capacitor C1 and the negative electrode of a varactor D1 and are connected with the ground in parallel.
Further, the buffer includes a voltage regulator D1, a cathode of the voltage regulator D1 is connected to an upper end of the adjustable resistor R11, an anode of the diode D3, and an output end of the operational amplifier U1B in the frequency selector, an anode of the voltage regulator D2 is connected to one end of the resistor R12, a lower end of the adjustable resistor R11, an adjustable end of the adjustable resistor R11, and one end of the capacitor C5, a cathode of the diode D3 is connected to one end of the resistor R14, one end of the resistor R13, and a base of the transistor Q3, another end of the resistor R13 is connected to one end of the resistor R16 and a base of the transistor Q2, a collector of the transistor Q2 is connected to another end of the resistor R16, a drain of the frequency selector Q1 is connected to the positive power source VCC, an emitter of the transistor Q2 is connected to one end of the capacitor C6, an emitter of the transistor Q3, a collector of the transistor Q3, and another end of the resistor R14, and another end of the resistor R12 are connected to one end of the field effect transistor Q6, The other end of the capacitor C5 and the other end of the capacitor C1 in the frequency selector are connected in parallel to the ground.
Furthermore, the signal output circuit receives the alarm signal output by the signal receiving circuit, the compensator compensates the alarm signal, and the output device frequency-modulates the alarm signal and outputs the modulated alarm signal to the signal transmission module.
Further, the compensator includes an operational amplifier U3B, a non-inverting terminal of the operational amplifier U3B is connected to the other terminal of a capacitor C6 in the signal receiving circuit, an inverting terminal of the operational amplifier U3B is connected to one terminal of a resistor R15 and one terminal of a resistor R17, an output terminal of the operational amplifier U3B is connected to the other terminal of a resistor R17 and one terminal of a capacitor C8, the other terminal of a capacitor C8 is connected to the other terminal of the resistor R18, one terminal of a capacitor C7 and a gate of a triode Q4, a drain of a field effect transistor Q4 is connected to the other terminal of the resistor R18, the other terminal of the capacitor C7 and the non-inverting terminal of an operational amplifier U1B in the signal receiving circuit, and a source of the field effect transistor Q4 is connected to the other terminal of the resistor R15 and a collector of a triode Q3 in the signal receiving circuit and connected to the ground.
Further, the output device includes a resistor R19, one end of the resistor R19 is connected to one end of a capacitor C13 and an output end of an operational amplifier U3B in the compensator, the other end of the capacitor C13 is connected to an anode of a diode D4, one end of a resistor R22, one end of a capacitor C12 and a gate of a field effect transistor Q5, a drain of the field effect transistor Q5 is connected to one end of a variable capacitor C9, one end of a resistor R24, the other end of a resistor R22, one end of a resistor R21 and one end of a variable inductor L3, the other end of the variable inductor L3 is connected to one end of a resistor R21, the other end of the variable capacitor C9, the other end of a resistor R19 and one end of a resistor R20, the other end of the resistor R20 is connected to a positive electrode of a triode Q2 in the signal receiving circuit and to a power supply VCC, the other end of the resistor R24 is connected to one end of a variable capacitor C10, one end of the inductor L2 and the negative electrode of a voltage regulator D5, and the other end of the inductor L2 are connected to the signal transmission module, One end of a capacitor C11, the other end of a capacitor C11 are respectively connected with the anode of a voltage regulator tube D5, one end of a resistor R23, the other end of a capacitor C12, the cathode of a diode D4 and the source of a field effect tube Q4 in the compensator and are connected with the ground in parallel, and the other end of a resistor R23 is connected with the source of the field effect tube Q5.
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 alarm signal is sent to the monitoring center through the signal transmission module in a wireless transmission mode, the problem that auxiliary work of the movable gas boiler room is increased due to laying and processing of cables when the movable gas boiler room is built and disassembled is avoided, auxiliary work of the movable gas boiler room is greatly reduced, and working efficiency is improved;
(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 compensating loss caused by frequency selection of the alarm signal by the frequency selector, and noise carried in the buffer is detected, so that the problem that when the movable gas boiler room is arranged in a civil building, more other signals are transmitted in the civil building, the electromagnetic environment of the place where the movable gas boiler room is located is complex, interference is caused on the alarm signal output by the emergency alarm module, the accuracy of the alarm signal is guaranteed to the maximum extent, 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 movable 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 movable gas boiler room alarm system is applied to a movable 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 movable 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 a 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 an emergency alarm module, and the emergency alarm module outputs an alarm signal to a 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 movable gas boiler room.
However, in the actual use process, it is found that when the movable 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 movable gas boiler room is located is complex, so that interference is caused on the alarm signal output by the signal judgment module, and 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 an alarm signal output by the emergency alarm module, the alarm signal is transmitted to the signal output circuit after passing through the frequency selector and the buffer, and the signal output circuit transmits the alarm signal to the signal transmission module after passing through the compensator and the output device;
the frequency selector comprises an inductor L1, one end of the inductor L1 is connected with the emergency alarm module, the other end of the inductor L1 is respectively connected with the anode of a variable-capacitance diode D1, one end of a capacitor C1 and one end of a resistor R1, the other end of a resistor R1 is respectively connected with the inverting end of an operational amplifier U1B, one end of a resistor R3, one end of a resistor R8 and the source electrode of a field-effect tube Q1, the inverting end of the operational amplifier U1B is connected with one end of a resistor R2, the output end of the operational amplifier U2 2 is respectively connected with the other end of the resistor R2, one end of the resistor R2 and one end of the capacitor C2, the other end of the resistor R2 is respectively connected with the other end of the capacitor C2, one end of the resistor R2, one end of the operational amplifier U2U 2 and one end of the inverting end of the resistor R2, the output end of the operational amplifier U2B is connected with one end of a resistor R7, the other end of the operational amplifier R6 and the grid of a field effect transistor Q1 respectively, the drain of the field effect transistor Q1 is connected with the other end of a resistor R7 and is connected with a positive power supply VCC, the other end of a resistor R9 is connected with the other end of a resistor R8, the other end of the resistor R4, the other end of a capacitor C2, the other end of the resistor R2, the other end of a capacitor C1 and the negative electrode of a varactor D1 in parallel connection and connected with the ground;
the buffer comprises a voltage regulator tube D1, the cathode of the voltage regulator tube D1 is respectively connected with the upper end of an adjustable resistor R11, the anode of a diode D3 and the output end of an operational amplifier U1B in the frequency selector, the anode of the voltage regulator tube D2 is respectively connected with one end of a resistor R12, the lower end of an adjustable resistor R11, the adjustable end of an adjustable resistor R11 and one end of a capacitor C5, the cathode of a diode D3 is respectively connected with one end of a resistor R14, one end of a resistor R13 and the base of a triode Q3, the other end of the resistor R13 is respectively connected with one end of a resistor R16 and the base of a triode Q2, the collector of the triode Q2 is respectively connected with the other end of a resistor R16, the drain of a field effect tube Q1 in the frequency selector is connected with a positive power supply VCC, the emitter of the triode Q2 is respectively connected with one end of a capacitor C6, the emitter of a triode Q3 and the collector of a triode Q3 are respectively connected with one end of a resistor R14, the other end of a resistor R12 and the other end of a capacitor 5, The other end of the capacitor C1 in the frequency selector is connected with the ground in parallel;
the signal receiving circuit comprises a frequency selector and a buffer, the frequency selector receives an alarm signal generated by an emergency alarm module, the inductor L1, the varactor diode D1 and the capacitor C1 are used for filtering the alarm signal, the filtered alarm signal is amplified in phase by the operational amplifier U1B, in order to avoid the influence on the accuracy of the alarm signal caused by mixing of other signals transmitted in civil buildings, such as signals transmitted by mobile phones, computers and the like, the signals are transmitted to the capacitor C3, the resistor R5, the resistor R4, the capacitor C2, the capacitor C4, the resistor R10 and the operational amplifier U2B for frequency selection of the alarm signal, the frequency-selected signals are output to the operational amplifier U1B by the field effect transistor Q1, the capacitor C3, the resistor R5, the resistor R4, the capacitor C2, the capacitor C4, the resistor R10 and the operational amplifier U2B are used as feedback amplifiers of the operational amplifier U1B, and the capacitors C9, R5 and R B are used for improving the feedback network of the capacitors C9 and R599 and the operational amplifier U2B to improve the frequency of the operational amplifier U1 and the amplifier The alarm signal amplitude stabilizing circuit comprises a resistor R4, a capacitor C2, a capacitor C4, a resistor R10 and an operational amplifier U2B, wherein the Q value of the alarm signal during frequency selection is avoided from being influenced by the fact that the Q value is too low, the precision of the alarm signal during frequency selection is avoided, meanwhile, the open loop gain of the operational amplifier U1B is improved, then the alarm signal is transmitted to a buffer, a voltage stabilizing tube D2 is used for stabilizing voltage, the amplitude of the alarm signal exceeding the voltage stabilizing range of the voltage stabilizing tube D2 is released through the resistor R12, an adjustable resistor R11 and the capacitor C1, and therefore the amplitude of the alarm signal is stabilized within a certain range, the diode D3 transmits the alarm signal to a triode Q3 and a triode Q2 for follow processing, the response capability of the alarm signal is improved, and the capacitor C6 couples the alarm signal to a signal output circuit.
The compensator comprises an operational amplifier U3B, wherein the non-inverting terminal of the operational amplifier U3B is connected with the other end of a capacitor C6 in the signal receiving circuit, the inverting terminal of the operational amplifier U3B is respectively connected with one end of a resistor R15 and one end of a resistor R17, the output terminal of the operational amplifier U3B is respectively connected with the other end of a resistor R17 and one end of a capacitor C8, the other end of a capacitor C8 is respectively connected with the other end of the resistor R18, one end of a capacitor C7 and the gate of a triode Q4, the drain of a field effect transistor Q4 is respectively connected with the other end of the resistor R18, the other end of the capacitor C7 and the non-inverting terminal of an operational amplifier U1B in the signal receiving circuit, and the source of the field effect transistor Q4 is respectively connected with the other end of the resistor R15 and the collector of a triode Q3 in the signal receiving circuit and grounded;
the output device comprises a resistor R19, one end of a resistor R19 is respectively connected with one end of a capacitor C13 and the output end of an operational amplifier U3B in the compensator, the other end of a capacitor C13 is respectively connected with the anode of a diode D4, one end of a resistor R22, one end of a capacitor C12 and the grid of a field effect transistor Q5, the drain of the field effect transistor Q5 is respectively connected with one end of a variable capacitor C9, one end of a resistor R24, the other end of a resistor R22, one end of a resistor R21 and one end of a variable inductor L3, the other end of the variable inductor L3 is respectively connected with one end of a resistor R21, the other end of a variable capacitor C9, the other end of a resistor R19 and one end of a resistor R20, the other end of the resistor R20 is connected with the collector of a triode Q2 in the signal receiving circuit, the collector of the resistor R24 is respectively connected with one end of a variable capacitor C10, one end of an inductor L2 and the cathode of an inductor D5, and the other end of the inductor L2 is respectively connected with the signal transmission module, One end of a capacitor C11, the other end of the capacitor C11 is connected with the anode of a voltage regulator tube D5, one end of a resistor R23, the other end of the capacitor C12, the cathode of a diode D4 and the source of a field effect tube Q4 in the compensator respectively and are connected in parallel with the ground, and the other end of the resistor R23 is connected with the source of the field effect tube Q5;
the signal output circuit comprises a compensator and an output device, the compensator amplifies the alarm signal by using an operational amplifier U3B to compensate the loss caused by the frequency selection of the alarm signal in the signal receiving circuit, the frequency of the alarm signal is detected by using a capacitor C8, a capacitor C7, a resistor R18 and a field effect transistor Q4 to avoid noise which does not accord with the alarm signal, namely noise mixing carried by a triode Q2 and a triode Q3 in the signal receiving circuit when working, if the noise which does not accord with the alarm signal is detected, the alarm signal is fed back to the frequency selector in the signal receiving circuit to carry out frequency selection again, the alarm signal is transmitted to the field effect transistor Q5, the capacitor C12, a variable capacitor C9, a resistor R21 and a variable inductor L3 through the capacitor C13 to carry out frequency modulation on the alarm signal, thereby increasing the anti-interference capability of the alarm signal and avoiding other signals transmitted in civil buildings from mixing in the alarm signal, therefore, the accuracy of the alarm signal is influenced, the analysis of the alarm signal by the monitoring center is also influenced, meanwhile, the resistor R24 and the voltage regulator tube D5 are used for stabilizing the voltage of the alarm signal, and in order to avoid the problem that impedance between the signal processing circuit and the signal transmission module is not matched and further cause the formation of reflection interference, the inductor L2, the variable capacitor C10 and the capacitor C11 are used for impedance matching so as to avoid the formation of reflection interference and influence on the accuracy of the alarm signal.
When the invention is used specifically, the alarm system 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 a gas signal in a movable 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, the emergency alarm module generates an alarm signal, the alarm signal is wirelessly transmitted to the monitoring center through the signal transmission module, the signal receiving circuit comprises a frequency selector and a buffer, the frequency selector receives the alarm signal generated by the emergency alarm module, the inductor L1, the varactor D1 and the capacitor C1 are utilized to filter the alarm signal, and the filtered alarm signal is amplified in phase by the operational amplifier U1B, the signal is transmitted to a capacitor C3, a resistor R5, a resistor R4, a capacitor C2, a capacitor C4, a resistor R10 and an operational amplifier U2B to carry out frequency selection on the alarm signal, the frequency-selected signal is output to an operational amplifier U1B by using a field effect tube Q1, the capacitor C3, a resistor R5, a resistor R4, a capacitor C2, a capacitor C4, a resistor R10 and an operational amplifier U2B are used as a feedback network of the operational amplifier U1B, the precision problem caused by the fact that the Q value is too low to carry out frequency selection on the alarm signal is avoided, then the alarm signal is stabilized by using a voltage stabilizing tube D2, the amplitude of the alarm signal exceeding the stabilizing range of the voltage stabilizing tube D2 is released by using a resistor R12, an adjustable resistor R11 and a capacitor C1, the diode D1 transmits the alarm signal to a triode Q1 to carry out follow processing, the alarm signal is coupled to an output circuit, and the output signal compensation circuit comprises a compensation circuit, the compensator amplifies an alarm signal by using an operational amplifier U3B, detects the frequency of the alarm signal by using a capacitor C8, a capacitor C7, a resistor R18 and a field effect tube Q4, avoids noise which does not accord with the alarm signal, namely noise carried by a triode Q2 and a triode Q3 in a signal receiving circuit from mixing when working, feeds the alarm signal back to a frequency selector for frequency selection if the noise does not accord with the alarm signal, transmits the alarm signal to the field effect tube Q5, the capacitor C12, the variable capacitor C9, the resistor R21 and the variable inductor L3 for frequency modulation of the alarm signal, and simultaneously stabilizes the alarm signal by using a resistor R24 and a voltage stabilizing tube D5, and performs impedance matching by using the inductor L2, the variable capacitor C10 and the capacitor C11 to avoid the formation of reflection interference and influence the accuracy of the alarm signal.
(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 alarm signal is sent to the monitoring center through the signal transmission module in a wireless transmission mode, the problem that auxiliary work of the movable gas boiler room is increased due to laying and processing of cables when the movable gas boiler room is built and disassembled is avoided, auxiliary work of the movable gas boiler room is greatly reduced, and working efficiency is improved;
(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 compensating loss caused by frequency selection of the alarm signal by the frequency selector, and noise carried in the buffer is detected, so that the problem that when the movable gas boiler room is arranged in a civil building, more other signals are transmitted in the civil building, the electromagnetic environment of the place where the movable gas boiler room is located is complex, interference is caused on the alarm signal output by the emergency alarm module, the accuracy of the alarm signal is guaranteed to the maximum extent, 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 movable gas boiler room alarm system, a serial communication port, alarm system includes signal acquisition module, signal judgment module, emergency alarm module, signal transmission module, surveillance center, the gas signal in the movable 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, and emergency alarm module produces alarm signal simultaneously, and alarm signal passes through signal transmission module wireless transmission to surveillance center.
2. The movable gas boiler room alarm system as claimed in claim 1, wherein the gas signal collected by the signal collecting module comprises a CO gas signal and a SO gas signal2Gas signal, H2S gas signal, CO2A gas signal.
3. The movable gas boiler room alarm system as claimed in 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 emergency alarm module, the alarm signal is transmitted to the signal output circuit after passing through the frequency selector and the buffer, and the signal output circuit transmits the alarm signal to the signal transmission module after passing through the compensator and the output device.
4. The movable gas-fired boiler room alarm system as claimed in claim 3, wherein the signal receiving circuit comprises a frequency selector and a buffer, the frequency selector receives and selects the alarm signal output by the emergency alarm module, and transmits the alarm signal after frequency selection to the signal output circuit after the buffer performs buffer processing.
5. The movable gas boiler room alarm system as claimed in claim 4, wherein the frequency selector comprises an inductor L1, one end of an inductor L1 is connected with the emergency alarm module, the other end of an inductor L1 is connected with the anode of a varactor diode D1, one end of a capacitor C1 and one end of a resistor R1 respectively, the other end of a resistor R1 is connected with the non-inverting terminal of an operational amplifier U1B, one end of a resistor R3, one end of a resistor R8 and the source of a field effect transistor Q1 respectively, the inverting terminal of an operational amplifier U1B is connected with one end of a resistor R2, the output terminal of an operational amplifier U2B is connected with the other end of a resistor R3, one end of a resistor R5 and one end of a capacitor C3, the other end of a resistor R5 is connected with one end of a resistor R10 and one end of a capacitor C2 respectively, the other end of a capacitor C3 is connected with one end of a capacitor C4 and one end of a resistor R4 and the other end of a capacitor C4 respectively, One end of a resistor R9, the in-phase end of an operational amplifier U2B, the inverting end of an operational amplifier U2B and one end of a resistor R6, wherein the output end of the operational amplifier U2B is respectively connected with one end of a resistor R7, the other end of an operational amplifier R6 and the grid of a field effect transistor Q1, the drain of the field effect transistor Q1 is connected with the other end of a resistor R7 and is connected with a positive power supply VCC, the other end of the resistor R9 is respectively connected with the other end of a resistor R8, the other end of the resistor R4, the other end of a capacitor C2, the other end of a resistor R2, the other end of a capacitor C1 and the negative electrode of a varactor D1, and are connected with the ground in parallel.
6. A movable gas boiler room alarm system as claimed in claim 4, characterized in that said buffer comprises a voltage regulator tube D1, the negative pole of the voltage regulator tube D1 is connected with the upper end of the adjustable resistor R11, the positive pole of the diode D3 and the output end of the operational amplifier U1B in the frequency selector respectively, the positive pole of the voltage regulator tube D2 is connected with one end of the resistor R12, the lower end of the adjustable resistor R11, the adjustable end of the adjustable resistor R11 and one end of the capacitor C5 respectively, the negative pole of the diode D3 is connected with one end of the resistor R14, one end of the resistor R13 and the base of the triode Q3 respectively, the other end of the resistor R13 is connected with one end of the resistor R16 and the base of the triode Q2, the collector of the triode Q2 is connected with the other end of the resistor R16 and the drain of the field effect transistor Q1 in the frequency selector respectively, the emitter of the triode Q2 is connected with one end of the capacitor C6 and the emitter of the transistor Q3 and the emitter of the power supply VCC respectively, The collector of the triode Q3 is connected with one end of the resistor R14, the other end of the resistor R12, the other end of the capacitor C5 and the other end of the capacitor C1 in the frequency selector respectively and is connected with the ground in parallel.
7. The movable gas boiler room alarm system as claimed in claim 3, wherein the signal output circuit receives the alarm signal output by the signal receiving circuit, compensates the alarm signal by the compensator, and outputs the alarm signal to the signal transmission module after the frequency modulation by the output device.
8. The movable gas-fired boiler room alarm system as claimed in claim 7, wherein the compensator comprises an operational amplifier U3B, the non-inverting terminal of the operational amplifier U3B is connected with the other terminal of a capacitor C6 in the signal receiving circuit, the inverting terminal of the operational amplifier U3B is connected with one terminal of a resistor R15 and one terminal of a resistor R17 respectively, the output terminal of the operational amplifier U3B is connected with the other terminal of a resistor R17 and one terminal of a capacitor C8 respectively, the other terminal of a capacitor C8 is connected with the other terminal of a resistor R18, one terminal of a capacitor C7 and the gate of a triode Q4 respectively, the drain of a field effect transistor Q4 is connected with the other terminal of a resistor R18, the other terminal of a capacitor C7 and the non-inverting terminal of an operational amplifier U1B in the signal receiving circuit, and the source of a field effect transistor Q4 is connected with the other terminal of a resistor R15 and the collector of a transistor Q3 in the signal receiving circuit and connected in parallel to the ground.
9. The movable gas boiler room alarm system as claimed in claim 7, wherein the output device comprises a resistor R19, one end of the resistor R19 is connected to one end of a capacitor C13 and the output end of an operational amplifier U3B in the compensator, the other end of the capacitor C13 is connected to the anode of a diode D4, one end of a resistor R22, one end of a capacitor C12 and the gate of a fet Q5, the drain of the fet Q5 is connected to one end of a variable capacitor C9, one end of a resistor R24, the other end of a resistor R22, one end of a resistor R21 and one end of a variable inductor L3, the other end of the variable inductor L3 is connected to one end of a resistor R21, the other end of a variable capacitor C9, the other end of a resistor R19 and one end of a resistor R20, the other end of the resistor R20 is connected to the collector of a triode Q2 in the signal receiving circuit and to the positive power supply, and the other end of the resistor R24 is connected to the VCC of the variable capacitor C10, One end of an inductor L2, the negative electrode of a voltage regulator tube D5, the other end of an inductor L2 are respectively connected with the signal transmission module and one end of a capacitor C11, the other end of the capacitor C11 is respectively connected with the positive electrode of a voltage regulator tube D5, one end of a resistor R23, the other end of a capacitor C12, the negative electrode of a diode D4 and the source electrode of a field effect tube Q4 in the compensator are connected in parallel and grounded, and the other end of the resistor R23 is connected with the source electrode of the field effect tube Q5.
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| CN210183322U (en) * | 2019-09-27 | 2020-03-24 | 黄河科技学院 | Portable wireless communication signal interference device |
| CN213903747U (en) * | 2020-12-30 | 2021-08-06 | 国网河南省电力公司信息通信公司 | Degradation detection circuit of storage battery |
| CN113266815A (en) * | 2021-05-21 | 2021-08-17 | 宋占友 | Skid-mounted movable boiler room |
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| CN109313838A (en) * | 2016-02-26 | 2019-02-05 | 霍尼韦尔国际公司 | For detecting the detector of multiple gases |
| CN210183322U (en) * | 2019-09-27 | 2020-03-24 | 黄河科技学院 | Portable wireless communication signal interference device |
| CN213903747U (en) * | 2020-12-30 | 2021-08-06 | 国网河南省电力公司信息通信公司 | Degradation detection circuit of storage battery |
| CN113266815A (en) * | 2021-05-21 | 2021-08-17 | 宋占友 | Skid-mounted movable boiler room |
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