CN104464166A - Air-breathing fire detecting system and method based on open-loop air channel - Google Patents
Air-breathing fire detecting system and method based on open-loop air channel Download PDFInfo
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- CN104464166A CN104464166A CN201410782265.1A CN201410782265A CN104464166A CN 104464166 A CN104464166 A CN 104464166A CN 201410782265 A CN201410782265 A CN 201410782265A CN 104464166 A CN104464166 A CN 104464166A
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
- G08B17/117—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means by using a detection device for specific gases, e.g. combustion products, produced by the fire
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Abstract
The invention provides an air-breathing fire detecting system and method based on an open-loop air channel. The system comprises an airflow component, an air breathing pipeline, detection components and a control panel. Sampling holes are formed in fixed intervals on the air breathing pipeline, and the detection components are arranged on the fixed intervals respectively. The method comprises the steps that a drive air pump sucks air in detection environment through the air breathing pipeline until the air flow rate in the air breathing pipeline reaches the set airflow flow rate in the air breathing pipeline, and when the smoke particle concentration is not smaller than a smoke particle concentration alarm threshold value, air currently existing in the air breathing pipeline is removed; the time interval that the smoke particle concentration is smaller than the smoke particle concentration alarm threshold valve two times is calculated; the position of a sampling point is determined. The distance between an alarm point on the air breathing pipeline and the detection components is calculated through the independent air breathing combination mode, the time interval, the set airflow flow rate in the air breathing pipeline and recoil time, and the problems that the detection distance is short, and an alarm area cannot be located are solved.
Description
Technical field
The invention belongs to technical field of fire detection, be specifically related to a kind of air suction type fire detecting system based on open loop gas circuit and method.
Background technology
Fire is smouldered to be converted to and is sent out that flame is on fire and what produce high heat is very crucial during this period of time by producing burning things which may cause a fire disaster.During this period of time have the situation that two kinds possible: one is that situation is continuous worsening, and then it is on fire to send out flame; Or take action, find out burning things which may cause a fire disaster, prevent the generation of fire, and then the danger avoiding fire to bring, loss and destruction.
The development of fire is divided into four-stage: ferment (before burning), visible smog, produces flame and Gao Re stage.The incubation period of smouldering at fire provides the more time and chance is detected and controls the development of fire.Air suction type fire disaster detector is mainly used in the commitment of detection of fires, and by using relative photo electronic technology to realize the detection of highly sensitive smoke particle, each sampled point of air suction type fire disaster detector should be regarded as a point type detectors.The longest sampled air transmission time from the sampled point of farthest to detector can not more than 120 seconds.The working method of the air suction type fire disaster detector that present market mainly adopts and formation are all that a main frame (main frame inner band getter assembly and detection components) connects different sample lines realization detections; The present invention's innovation proposes independently airflow management assembly, Distributed probing assembly, the high sensitivity detection of combined with intelligent Detection location algorithm realization and location.
Air sampling formula (air suction type) smoke detector, pole early detection for fire has obviously effect, and provide effective solution to the place that some conventional fire alarm detector cannot be suitable for, be therefore used in the place such as clean room, warehouse (especially high rack warehouse), telecommunications room, IDC machine room, switchboard widely.
Summary of the invention
The object of the present invention is to provide a kind of air suction type fire detecting system based on open loop gas circuit and method.
Technical scheme of the present invention is:
Based on an air suction type fire detecting system for open loop gas circuit, comprising: for sucking the air-flow assembly of gas in acquisition environment, suction line, some detection components and control panel;
Described suction line is arranged in detection environment;
Described suction line has some thieff hatchs in fixed intervals, and each fixed intervals place is configured with a detection components;
Described air-flow assembly comprises air pump, air-flow velocity detection components and pure air recoiling device;
Described air pump is connected to one end of suction line, arranges gas flow rate detection components between air pump and one end of suction line, and pure air recoiling device is connected to suction line;
The input end of described control panel connects the output terminal of detection components, the output terminal of air-flow velocity detection components respectively, and the output terminal of control panel connects the input end of pure air recoiling device, the input end of air pump.
The output terminal of described control panel is connected with the display screen for showing fire detecting and alarm region.
Described detection components is high sensitivity smoke detector.
Described pure air recoiling device comprises high pressure pure air gas cylinder and normally closed Unidirectional solenoid valve; High pressure pure air gas cylinder is connected to suction line, and in the connecting line of high pressure pure air gas cylinder and suction line, arrange normally closed Unidirectional solenoid valve, opening or closing of normally closed Unidirectional solenoid valve is controlled by control panel.
Described control panel comprises main control unit, relay drive circuit, fault-signal relay, alarm relay, pilot relay; The input end of main control unit connects the output terminal of detection components, the output terminal of air-flow velocity detection components respectively, the output terminal of main control unit connects input end, the input end of pure air recoiling device, the input end of air pump of relay drive circuit respectively, the output terminal of relay drive circuit connects fault-signal relay, alarm relay, pilot relay respectively, and pilot relay connects pure air recoiling device.
The air suction type fire detecting system based on open loop gas circuit described in employing carries out fire detecting method, comprises the following steps:
Step 1: the air-flow velocity C in setting suction line, the smoke particle concentration alarm threshold value in suction line, recoil time T0;
Step 2: control panel drives air pump by suction line to gas air-breathing in acquisition environment, in breathing process, air-flow velocity detection components detects the gas flow rate in suction line in real time, until the gas flow rate in suction line reaches the air-flow velocity in the suction line of setting, perform step 3;
Step 3: the smoke particle concentration in each thieff hatch effluent air of each detection components real-time detection, and transfer to control panel;
Step 4: judge whether current smoke particle concentration is less than smoke particle concentration alarm threshold value: be then return step 3, otherwise perform step 5;
Step 5: the normally closed Unidirectional solenoid valve that control panel controls pure air recoiling device is opened, and pours in suction line, empties the gas in current suction line, until reach the recoil time by the gas in high pressure pure air gas cylinder;
Step 6: repeat step 2 ~ step 4 and again detect, if current smoke particle concentration is less than smoke particle concentration alarm threshold value, then return step 3, otherwise, calculate the time interval T detecting smoke particle concentration for twice and be less than smoke particle concentration alarm threshold value;
Step 7: according to the air-flow velocity C in the suction line of time interval T, setting and recoil time T0, distance S=C × (T-T0) × K, the K in calculating suction line between alarm set point and detection components is correction factor;
Step 8: according to the length of distance S and suction line, determine sampling point position, the acquisition environment region that this sampled point is corresponding is fire alarm region, shows fire alarm region simultaneously.
Beneficial effect:
By adopt independent air-breathing array mode, according to the air-flow velocity in the suction line of the time interval, setting and recoil time, calculate the distance between alarm set point and detection components in suction line, solving traditional air breathing type detection cannot the technical matters in locating alarming region apart from short and detection.
Accompanying drawing explanation
Fig. 1 is a kind of air suction type fire detecting system structural representation based on open loop gas circuit of the specific embodiment of the invention, wherein, and 1-suction line, 2-thieff hatch;
Fig. 2 is the air-flow assembly structural representation of the specific embodiment of the invention, wherein, and the normally closed Unidirectional solenoid valve of 3-;
Fig. 3 is a kind of air suction type fire detecting system structured flowchart based on open loop gas circuit of the specific embodiment of the invention;
Fig. 4 is the air suction type fire detecting method process flow diagram based on open loop gas circuit of the specific embodiment of the invention;
Fig. 5 is main control unit and the LCD display catenation principle figure of the specific embodiment of the invention;
Fig. 6 is the fault-signal relay of the specific embodiment of the invention, alarm relay and control relay circuit schematic diagram, wherein, and 4-fault-signal relay, 5-alarm relay, 6-pilot relay;
Fig. 7 is the communication interface unit circuit theory diagrams of the specific embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated.
Based on an air suction type fire detecting system for open loop gas circuit, as shown in Figure 1, comprising: for sucking the air-flow assembly of gas in acquisition environment, suction line, some detection components and control panel;
Suction line 1 is arranged in detection environment; Suction line adopts PPR material, as long as can ensure that air-flow is unobstructed, the length from suction line end to air-flow assembly is no more than 200 meters.
Suction line 1 has in fixed intervals 200 meters and is no more than N=40 thieff hatch, each fixed intervals place is configured with a detection components;
As shown in Figure 2, air-flow assembly comprises air pump, air-flow velocity detection components and pure air recoiling device; Air pump adopts model to be PQ191GA10 low-noise air pump, and air-flow detection components adopts SICK FLOWSIC600 ultrasonic gas current meter; High pressure pure air gas cylinder model is WMA267-50-80-15, normally closed Unidirectional solenoid valve adopts 2V250-25, display screen to adopt LCD display.
Air pump is connected to one end of suction line, arranges gas flow rate detection components between air pump and one end of suction line, and pure air recoiling device is connected to suction line;
Pure air recoiling device comprises high pressure pure air gas cylinder and normally closed Unidirectional solenoid valve 3; High pressure pure air gas cylinder is connected to suction line, and in the connecting line of high pressure pure air gas cylinder and suction line, arrange normally closed Unidirectional solenoid valve 3, opening or closing of normally closed Unidirectional solenoid valve 3 is controlled by the pilot relay of control panel.
As shown in Figure 3, the input end of control panel connects the output terminal of the output terminal of detection components, air-flow velocity detection components respectively, and the output terminal of control panel connects the input end of pure air recoiling device, the input end of air pump.
Detection components is high sensitivity smoke detector SYBJW01.
Control panel comprises main control unit, relay drive circuit, fault-signal relay, alarm relay, pilot relay; Main control unit adopts model to be the single-chip microcomputer of C8051F340/1/4/5, and as shown in Figure 5, the main control unit output terminal of control panel is connected with the LCD display for showing fire detecting and alarm region.
The input end of main control unit connects the output terminal of detection components, the output terminal of air-flow velocity detection components respectively, the output terminal of main control unit connects input end, the input end of pure air recoiling device, the input end of air pump of relay drive circuit respectively, the output terminal of relay drive circuit connects fault-signal relay, alarm relay, pilot relay respectively, pilot relay connects pure air recoiling device, and fault-signal relay, alarm relay export as shown in Figure 6 as signal.
The output terminal of main control unit also connects communication interface unit as shown in Figure 7, for carrying out data communication with external device.
Adopt the air suction type fire detecting system based on open loop gas circuit to carry out fire detecting method, as shown in Figure 4, comprise the following steps:
Step 1: the air-flow velocity C=10 m/s in setting suction line, the smoke particle concentration alarm threshold value in suction line, recoil time T0=20s;
Step 2: control panel drives air pump by suction line to gas air-breathing in acquisition environment, in breathing process, air-flow velocity detection components detects the gas flow rate in suction line in real time, until the gas flow rate in suction line reaches the air-flow velocity in the suction line of setting, perform step 3;
Step 3: the smoke particle concentration in each thieff hatch effluent air of each detection components real-time detection, and transfer to control panel;
Step 4: judge whether current smoke particle concentration is less than smoke particle concentration alarm threshold value: be then return step 3, otherwise perform step 5;
Step 5: the normally closed Unidirectional solenoid valve that control panel controls pure air recoiling device is opened, and pours in suction line, empties the gas in current suction line, until reach the recoil time by the gas in high pressure pure air gas cylinder;
Step 6: repeat step 2 ~ step 4 and again detect, if current smoke particle concentration is less than smoke particle concentration alarm threshold value, then return step 3, otherwise, calculate the time interval T=40s detecting smoke particle concentration for twice and be less than smoke particle concentration alarm threshold value;
Step 7: according to the air-flow velocity C in the suction line of time interval T, setting and recoil time T0, calculate distance S=C × (the T-T0) × K=160m between alarm set point and detection components in suction line, wherein, K=0.8 is correction factor;
Step 8: according to the length of distance S and suction line, determine sampling point position, the acquisition environment region that this sampled point is corresponding is fire alarm region, shows fire alarm region simultaneously.
Claims (6)
1. based on an air suction type fire detecting system for open loop gas circuit, it is characterized in that, comprising: for sucking the air-flow assembly of gas in acquisition environment, suction line, some detection components and control panel;
Described suction line is arranged in detection environment;
Described suction line has some thieff hatchs in fixed intervals, and each fixed intervals place is configured with a detection components;
Described air-flow assembly comprises air pump, air-flow velocity detection components and pure air recoiling device;
Described air pump is connected to one end of suction line, arranges gas flow rate detection components between air pump and one end of suction line, and pure air recoiling device is connected to suction line;
The input end of described control panel connects the output terminal of detection components, the output terminal of air-flow velocity detection components respectively, and the output terminal of control panel connects the input end of pure air recoiling device, the input end of air pump.
2. the air suction type fire detecting system based on open loop gas circuit according to claim 1, is characterized in that, the output terminal of described control panel is connected with the display screen for showing fire detecting and alarm region.
3. the air suction type fire detecting system based on open loop gas circuit according to claim 1, is characterized in that, described detection components is high sensitivity smoke detector.
4. the air suction type fire detecting system based on open loop gas circuit according to claim 1, is characterized in that, described pure air recoiling device comprises high pressure pure air gas cylinder and normally closed Unidirectional solenoid valve; High pressure pure air gas cylinder is connected to suction line, and in the connecting line of high pressure pure air gas cylinder and suction line, arrange normally closed Unidirectional solenoid valve, opening or closing of normally closed Unidirectional solenoid valve is controlled by control panel.
5. the air suction type fire detecting system based on open loop gas circuit according to claim 1, is characterized in that, described control panel comprises main control unit, relay drive circuit, fault-signal relay, alarm relay, pilot relay; The input end of main control unit connects the output terminal of detection components, the output terminal of air-flow velocity detection components respectively, the output terminal of main control unit connects input end, the input end of pure air recoiling device, the input end of air pump of relay drive circuit respectively, the output terminal of relay drive circuit connects fault-signal relay, alarm relay, pilot relay respectively, and pilot relay connects pure air recoiling device.
6. adopt the air suction type fire detecting system based on open loop gas circuit according to claim 1 to carry out fire detecting method, it is characterized in that, comprise the following steps:
Step 1: the air-flow velocity C in setting suction line, the smoke particle concentration alarm threshold value in suction line, recoil time T0;
Step 2: control panel drives air pump by suction line to gas air-breathing in acquisition environment, in breathing process, air-flow velocity detection components detects the gas flow rate in suction line in real time, until the gas flow rate in suction line reaches the air-flow velocity in the suction line of setting, perform step 3;
Step 3: the smoke particle concentration in each thieff hatch effluent air of each detection components real-time detection, and transfer to control panel;
Step 4: judge whether current smoke particle concentration is less than smoke particle concentration alarm threshold value: be then return step 3, otherwise perform step 5;
Step 5: the normally closed Unidirectional solenoid valve that control panel controls pure air recoiling device is opened, and pours in suction line, empties the gas in current suction line, until reach the recoil time by the gas in high pressure pure air gas cylinder;
Step 6: repeat step 2 ~ step 4 and again detect, if current smoke particle concentration is less than smoke particle concentration alarm threshold value, then return step 3, otherwise, calculate the time interval T detecting smoke particle concentration for twice and be less than smoke particle concentration alarm threshold value;
Step 7: according to the air-flow velocity C in the suction line of time interval T, setting and recoil time T0, distance S=C × (T-T0) × K, the K in calculating suction line between alarm set point and detection components is correction factor;
Step 8: according to the length of distance S and suction line, determine sampling point position, the acquisition environment region that this sampled point is corresponding is fire alarm region, shows fire alarm region simultaneously.
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| CN111402540A (en) * | 2020-02-25 | 2020-07-10 | 王勇强 | Air-breathing smoke-sensing fire detection device, method and equipment |
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| DE10348565B4 (en) * | 2003-10-20 | 2007-01-04 | Wagner Alarm- Und Sicherungssysteme Gmbh | Method and device for detecting and locating a fire |
| CN101727727B (en) * | 2009-11-30 | 2011-06-15 | 西安博康电子有限公司 | Suction-type double detection smoke-sensing fire detection system and alarm method thereof |
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| CN102568140B (en) * | 2012-01-16 | 2014-01-01 | 南京消防器材股份有限公司 | Detection device and detection method for fire alarm and linkage control system |
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| CN111724562B (en) * | 2020-06-05 | 2021-11-16 | 珠海格力电器股份有限公司 | Smoke alarm and correction method thereof |
| CN112525626A (en) * | 2020-12-01 | 2021-03-19 | 蓝菠万(山东)科技有限公司 | Accurate positioning system and method for pipeline air suction type air sampling abnormal position |
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Address after: 110034 No. 218-20, Wen Da Road, Huanggu District, Shenyang, Liaoning. Patentee after: Shenyang Institute of Fire Protection, Ministry of Emergency Management Address before: 110034 No. 218-20, Wen Da Road, Huanggu District, Shenyang, Liaoning. Patentee before: Shenyang Fire-Extiquishing Inst., Public Security Ministry |