Smoke detection system and fire source detection method thereof

Abstract

The invention discloses a smoke detection system which comprises an air inlet channel, a smoke detection cavity, a first flow guide device, a second flow guide device, a smoke collection unit, a timing unit and a control device. The invention further discloses a fire source detection method of the smoke detection alarm system. Smoke entering the smoke detection cavity is collected through the smoke collection unit, the working state of the first flow guide device and the working state of the second flow guide device are controlled, and the actual smoke collection time is obtained, namely the actual time from the time when smoke in the air inlet channel and the smoke detection cavity is emptied to the time when the smoke is detected again. And the actual time is compared with the theoretical time when each air inlet channel enters the smoke detection cavity, so that a fire source or a fire direction can be quickly determined, a plurality of to-be-detected areas can be monitored at the same time, early monitoring and alarming of the fire are realized, and more serious fire accidents are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of fire alarm, in particular to a smoke detection system and a fire source detection method thereof. Background Art

[0002] In some large places with limited space, such as warehouses, factories, exhibition halls, etc., due to the large number of combustibles in the space, once a fire occurs, the fire will spread very quickly, often causing immeasurable losses to the units to which it belongs. For some places with important equipment, such as data centers, telecommunications rooms and other core places of informatization, due to the dense distribution equipment such as wires and cables, once a fire occurs, the harm caused cannot be ignored. Therefore, it is particularly important to build a fire detection system for the above places.

[0003] Conventional fire detectors generally use the principle of molecular diffusion for passive detection. In the early stages of a fire, since the flame target is generally small, the smoke and CO concentration it produces are relatively low, making it difficult for the fire detector to detect and quickly locate the source of the fire. The present invention aims to invent a smoke detection alarm device and a fire source detection method thereof, which can quickly locate the source of a fire and monitor early-stage fires. Summary of the invention

[0004] The purpose of the present invention is to provide a smoke detection system and a fire source detection method thereof designed to solve the deficiencies of the above-mentioned technology.

[0005] The present invention designs a smoke detection system, comprising:

[0006] An air inlet channel, at least two of which are provided, each of which is connected to a corresponding area to be detected;

[0007] a smoke detection chamber, which is connected to the air inlet passages respectively;

[0008] A first flow guide device is used to draw the air in the area to be detected into the smoke detection chamber through the air inlet channel;

[0009] A second flow guide device is used to discharge the air in the air intake passage and the smoke detection cavity;

[0010] A smoke collection unit, used to detect the smoke concentration in the smoke detection chamber;

[0011] The timing unit is used to start timing after the smoke collection unit detects smoke for the first time and the smoke in the smoke detection chamber and the air inlet channel is exhausted, and then stop timing when the smoke collection unit detects smoke again, so as to obtain the actual time t of smoke collection;

[0012] A control device, which is respectively connected to the first flow guiding device, the second flow guiding device, the smoke collecting unit and the timing unit;

[0013] It is used to control the start of the first guide device until the smoke collection unit detects smoke concentration information for the first time, controls the first guide device to be closed, starts the second guide device for a preset time and then closes it, restarts the first guide device, and judges the source of the fire when the smoke collection unit detects smoke information again; it is also used to obtain the actual time t of smoke collection and the theoretical time t of smoke in the detection area entering the smoke detection chamber from each air inlet channel when judging the source of the fire. n , and compare the actual time t with the theoretical time t n The actual time t is compared with the theoretical time t n The detection area corresponding to the air intake channel with the smallest absolute value of the difference is the fire source; among them, the theoretical time t corresponding to each air intake channel n Each is different.

[0014] Preferably, it further comprises a gas detection system, which comprises a gas detection chamber connected to the smoke detection chamber, and a CO collection unit connected to the control device; the CO collection unit is used to collect the CO concentration in the gas detection chamber.

[0015] Preferably, a first air outlet pipe is provided between the smoke detection chamber and the gas detection chamber, and a first switch valve for controlling the opening and closing state of the first air outlet pipe is provided on the first air outlet pipe;

[0016] The gas detection system also includes a CO generating device for releasing a set amount of CO gas into the gas detection chamber when calibrating the CO collection unit under set conditions;

[0017] The control device is respectively connected to the detection resistor unit, the first switch valve, and the CO generating device of the CO collection unit; and is also used to ensure that the CO gas remaining in the gas detection chamber is discharged when the CO collection unit is calibrated, control the first switch valve to close, and control the CO generating device to start. When the current value collected by the CO collection unit is different from the current preset value, adjust the resistance value of the detection resistor unit so that the current value re-collected by the CO collection unit is equal to the current preset value;

[0018] The set amount of CO gas released is equal to the CO concentration corresponding to the preset value of the current.

[0019] Preferably, the CO collection unit is a semiconductor CO sensor, and the detection resistor unit includes a detection resistor connected in series and an adjustable resistor connected to the control device;

[0020] When the current collected by the CO collection unit is stable and the current value is less than the current preset value, the control device reduces the resistance value of the adjustable resistor until the current value re-collected by the CO collection unit is equal to the current preset value; when the current collected by the CO collection unit is stable and the current value is greater than the current preset value, the control device increases the resistance value of the adjustable resistor until the current value re-collected by the CO collection unit is equal to the current preset value.

[0021] Preferably, the gas detection system further comprises a third flow guiding device connected to the control device, which is used for dispersing the CO gas released in the gas detection chamber when calibrating the CO collection unit.

[0022] Preferably, the control device starts the third flow guiding device and controls the start-up time t of the third flow guiding device. 启 , dispersing the CO gas released in the gas detection chamber until the current value collected by the CO collection unit is stable;

[0023] Wherein, the volume of the gas detection chamber is V 腔 The wind speed caused by the activation of the third guide device is V 导 The cross-sectional area of ​​the air duct of the third air guide device is S, t 启 =2V 腔 ÷S÷V 导 .

[0024] Preferably, it further comprises a gas processing system, wherein the gas processing system comprises a gas processing chamber, a CO sensing unit and a CO absorption device;

[0025] The gas processing chamber is provided with an exhaust pipe, the exhaust pipe is provided with a second switch valve, the gas processing chamber is connected with at least one of the gas detection chamber and the smoke detection chamber through the second exhaust pipe, and the second exhaust pipe is provided with a third switch valve;

[0026] The CO sensing unit is used to collect the CO concentration in the gas processing chamber, and the CO absorption device is used to absorb the CO gas entering the gas processing chamber;

[0027] The control device is connected to the CO sensor unit, the second switch valve, and the third switch valve respectively; it is used to control the third switch valve to close before the CO generating device is started, and is also used to control the second switch valve to open when the CO concentration value collected by the CO sensor unit is lower than the third set concentration.

[0028] Preferably, it also includes a temperature collection unit connected to the control device, which is used to collect the air temperature in the area to be detected or in the air intake passage.

[0029] Preferably, the setting condition includes any one of the following conditions:

[0030] After the source of the fire is determined;

[0031] After the CO collection unit detects that the CO gas concentration value exceeds the first set concentration;

[0032] After the temperature acquisition unit detects that the air temperature value exceeds the set temperature;

[0033] After the smoke collecting unit detects that the smoke concentration value exceeds a fourth set concentration.

[0034] Preferably, the first flow guiding device is installed in at least one of the air intake passage and the smoke detection chamber, and the second flow guiding device is installed in the air intake passage or the smoke detection chamber.

[0035] Preferably, each of the air intake passage and the smoke detection chamber is provided with a first guide device, and before the timing unit starts, the first guide device in the smoke detection chamber is started, and the first guide device in the air intake passage is closed; when the timing unit starts, the first guide device in the smoke detection chamber is closed, and the first guide device in the air intake passage is started;

[0036] The theoretical time t n Equal to the length L of each intake channel n Divided by the wind speed V generated in each air inlet channel due to the activation of the corresponding first guide device n .

[0037] The present invention also provides a fire source detection method of a smoke detection system, wherein the smoke detection system comprises an air intake channel, at least two of which are provided, each of which is connected to a corresponding area to be detected; a smoke detection chamber, which is connected to the air intake channel respectively; a first guide device, which is used to suck the air in the area to be detected into the smoke detection chamber through the air intake channel; a second guide device; a smoke collection unit, which is used to detect the smoke concentration in the smoke detection chamber; a timing unit; and a control device, which is respectively connected to the first guide device, the second guide device, the smoke collection unit and the timing unit;

[0038] The fire source detection method comprises the following steps:

[0039] The control device controls the first flow guiding device to start;

[0040] When the smoke collection unit detects smoke in the smoke detection chamber for the first time, the control device controls the first guide device to close and controls the second guide device to start for a preset time and then close, so that smoke is discharged from the smoke detection chamber and the air intake channel, and the control device controls the timing unit to start timing;

[0041] The control device controls the first guide device to start, so that the air in the area to be detected re-enters the smoke detection chamber through the corresponding air inlet channel;

[0042] When the smoke collection unit detects smoke in the smoke detection chamber again, the control device controls the timing unit to stop timing, and the control device obtains the actual time t of smoke collection;

[0043] The control device obtains the theoretical time t of smoke in the detection area entering the smoke detection chamber from each air inlet channel n , and compare the actual time t with each theoretical time t n Compare the actual time t and the theoretical time t n The area to be detected corresponding to the air intake channel with the smallest absolute value of the difference is the source of the fire, and a fire alarm is prompted.

[0044] Preferably, the control device controls the preset duration of activation of the second guide device to ensure that smoke is completely discharged from the smoke detection chamber and the air inlet passage after the smoke collection unit detects smoke in the smoke detection chamber for the first time;

[0045] Among them, the preset time t 吹 =2*Ln / V 吹 , the length of the air inlet passage is Ln, and the wind speed caused by the activation of the second flow guide device is V 吹 .

[0046] The technical effect of the present invention is to collect the smoke entering the smoke detection chamber through the smoke collection unit, and control the working status of the first guide device and the second guide device to obtain the actual time of smoke collection, that is, the actual time from the smoke in the smoke detection chamber to the smoke being detected again, and compare the actual time with the theoretical time of each air inlet channel entering the smoke detection chamber, so as to quickly determine the source of the fire or the direction of the fire, and can simultaneously monitor multiple areas to be detected, realize early monitoring and alarm of the fire, buy precious time for fire fighting, and avoid causing more serious fire accidents. Since the first guide device can realize air suction, smoke and gas can quickly enter the smoke detection chamber from the area to be detected, and the second guide device can realize air blowing, which can realize self-cleaning of the smoke detection chamber and the air inlet channel.

[0047] By adopting the integrated monitoring method of multiple collection units such as smoke collection unit, CO collection unit and temperature collection unit, temperature, smoke and CO gas detection can be performed on multiple detection areas at the same time, which can improve the accuracy and reliability of fire monitoring.

[0048] By setting an adjustable resistor in the detection resistor unit of the semiconductor CO sensor, and cooperating with the CO generating device and the third flow guide device, the detection resistor in the semiconductor CO sensor can be automatically calibrated when it deviates, thereby improving its service life and detection accuracy. The CO gas discharged from the gas detection chamber is processed by the gas processing chamber to ensure that it is discharged after meeting the emission standards, thereby protecting the environment.

[0049] The air intake channels can be set in different rooms to monitor multiple rooms at the same time. The smoke detection system can be installed on the top of warehouses, factories, exhibition halls and other areas to cover the entire space and quickly determine the location of the fire. It can also be installed around pipelines in data centers, telecommunications rooms, etc. to focus on protecting the pipelines and reduce the serious damage to important equipment caused by fire. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a structural schematic diagram of a smoke detection system provided by the present invention;

[0051] Figure 2 This is a circuit principle structure block diagram of a smoke detection system provided by the present invention;

[0052] Figure 3 It is a structural schematic diagram of a gas detection system and a gas processing system provided by the present invention;

[0053] Figure 4 is a circuit schematic diagram of a detection resistor unit provided by the present invention;

[0054] Figure 5 It is a schematic diagram of a fire source detection method of a smoke detection system provided by the present invention;

[0055] Figure 6 yes Figure 5 Schematic diagram of the process of smoke monitoring;

[0056] Figure 7 yes Figure 5 Schematic diagram of the CO acquisition unit calibration process.

[0057] In the figure: 1. air inlet channel, 2. area to be detected, 3. smoke detection chamber, 4. first flow guide device, 5. second flow guide device, 6. smoke collection unit, 7. timing unit, 8. control device, 9. alarm unit, 10. gas detection chamber, 11. CO collection unit, 12. first switch valve, 13. CO generating device, 14. flow regulating valve, 15. third flow guide device, 16. gas processing chamber, 17. CO sensing unit, 18. CO absorption device, 19. second switch valve, 20. third switch valve, 21. temperature collection unit. DETAILED DESCRIPTION

[0058] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0059] In this embodiment, Figure 1-3 As shown, a smoke detection system disclosed in the present invention comprises: an air inlet channel 1, which is provided with at least two, each air inlet channel 1 has an air inlet and an air outlet, the air inlet is connected to the corresponding area to be detected 2, and is used to introduce air into the corresponding area to be detected 2. The locations of the areas to be detected 2 are different, and can be different rooms or different locations in a large area. A smoke detection cavity 3 has multiple air inlet ends, and the air inlet ends are connected to the air outlets of the air inlet channel 1 one by one.

[0060] The first guide device 4 is installed in each air inlet channel 1 and smoke detection chamber 3, and has an air suction end for sucking the air in the detection area 2 into the smoke detection chamber 3 through the air inlet channel 1. The second guide device 5 is installed in the smoke detection chamber 3, and is used to discharge the air in the air inlet channel 1 and the smoke detection chamber 3 to ensure the accuracy of subsequent smoke measurement, and play a self-cleaning role for the smoke detection chamber 3 and the air inlet channel 1. The smoke collection unit 6 is installed in the smoke detection chamber 3 and is used to detect the smoke concentration in the smoke detection chamber 3. The smoke collection unit 6 adopts a high-sensitivity smoke sensor. When the smoke concentration value exceeds the fourth set concentration, the alarm unit integrated in the smoke collection unit 6 will sound a smoke alarm, which can quickly detect the smoke generated in the early stage of the fire.

[0061] In this embodiment, the first flow guide device 4 in the air inlet channel 1 is arranged near the air inlet end of the smoke detection chamber 3, and is used to generate airflow in the air inlet channel 1 and the smoke detection chamber 3, respectively, which helps the air circulation in the air inlet channel 1 and the smoke detection chamber 3, and the smoke collection unit 6 collects smoke more efficiently. The first flow guide device 4 in the air inlet channel 1 is an air suction fan, and the first flow guide device 4 and the second flow guide device 5 in the smoke detection chamber 3 are integrated into one body, which is a dual-purpose fan for suction and blowing.

[0062] The timing unit 7 is used to start timing after the smoke collection unit 6 detects smoke for the first time and the smoke in the smoke detection chamber 3 and the air inlet channel 1 is exhausted, and then stop timing when the smoke collection unit 6 detects smoke again to obtain the actual time t of smoke collection. When the smoke collection unit 6 detects smoke for the first time, the smoke concentration value collected at this time is generally greater than the fourth set concentration, that is, the location determination of the fire source will begin only when the alarm threshold is reached.

[0063] The control device 8 is used to control and adjust the working state of each electronic component in the system to ensure the normal operation of the system. It is connected to the first guide device 4, the second guide device 5, the smoke collection unit 6 and the timing unit 7 respectively.

[0064] The control device 8 is used to control the first guide device 4 to start before the smoke collection unit 6 detects smoke for the first time, so that it can suck the air in the detection area 2 into the smoke detection chamber 3 through the air inlet channel 1. When the smoke collection unit 6 detects smoke concentration information for the first time, the first guide device 4 is controlled to be closed, and the second guide device 5 is started for a preset time to ensure that the smoke concentration in the smoke detection chamber 3 is lower than the detection accuracy of the smoke collection unit 6. It is more ideal to completely discharge the smoke from the smoke detection chamber 3 and the air inlet channel 1. Then the second guide device 5 is controlled to close and the first guide device 4 is restarted, so that the smoke in the detection area 2 is sucked into the smoke detection chamber 3 again through the air inlet channel 1, until the smoke collection unit 6 detects smoke information again to determine the source of the fire.

[0065] Theoretically, the shorter the interval between the time when the timing unit 7 starts timing and the time when the first guide device 4 in the air intake channel 1 starts, the better. The optimal situation is that the moment when the second guide device 5 in the smoke detection chamber 3 stops, the moment when the timing starts, and the moment when the first guide device 4 in the air intake channel 1 starts are all at the same time.

[0066] Before the smoke in the smoke detection chamber 3 and the air inlet passage 1 is completely exhausted, that is, before the timing unit 7 starts, the first flow guide device 4 in the smoke detection chamber 3 is started, and the first flow guide device 4 in the air inlet passage 1 is closed to reduce energy consumption and possible interference. After the smoke in the smoke detection chamber 3 and the air inlet passage 1 is completely exhausted, that is, when the timing unit 7 starts, the first flow guide device 4 in the smoke detection chamber 3 is closed, and the first flow guide device 4 in the air inlet passage 1 is started.

[0067] The control device 8 controls the second guide device 5 to start and set a sufficient preset time, which can theoretically ensure that after the smoke collection unit 6 detects smoke in the smoke detection chamber 3 for the first time, the smoke is completely discharged from the smoke detection chamber 3 and the air inlet channel 1, wherein the preset time is t 吹 , the length of the air inlet channel 1 is set to Ln, and the wind speed 3 caused by the activation of the second flow guide device 5 is V 吹 , t 吹 =2*Ln / Vblowing.

[0068] The control device 8 is also used to adjust the length L of each intake channel 1 n and the wind speed V generated by the first flow guide device 4 in each air inlet channel 1 when it is activated n , length L n Divide by wind speed V n, calculate the theoretical time t of smoke in the detection area 2 entering the smoke detection chamber 3 from each air inlet channel 1 n .

[0069] When determining the source of the fire, the control device 8 obtains the actual time t and the theoretical time t of smoke collection. n , and compare the actual time t with the theoretical time t n The actual time t is compared with the theoretical time t n The detection area 2 corresponding to the air intake channel 1 with the smallest absolute value of the difference is the fire source, and a fire alarm signal is generated. Among them, the theoretical time t corresponding to each air intake channel 1 n It also includes an alarm unit 9 connected to the control device 8, which is used for performing a fire alarm according to the fire alarm signal.

[0070] In this embodiment, three air inlet channels 1 are provided, which are respectively connected to three different detection areas 2 and are used to introduce the air in the detection area 2 into the smoke detection chamber 3. The number of air inlet channels 1 can be set according to needs.

[0071] To ensure the theoretical time t corresponding to each intake channel 1 n For example, the wind speed V generated by the first guide device 4 in each air inlet channel 1 is different from n The fan power in the three air inlet channels 1 is from large to small, so that the wind speeds generated by each air inlet channel 1 are V1, V2, and V3 respectively. The wind speed V generated by the activation of the first guide device 4 in the smoke detection chamber 3 is set to 1.5V1, wherein V1>V2>V3. The length of each air inlet channel 1 is set according to the actual situation, so that each air inlet channel 1 obtains a different theoretical time t n , t1>t2>t3. The lengths of the air inlet channels 1 may be the same or similar, or completely different.

[0072] In another embodiment, only the first guide device 4 is arranged in the smoke detection chamber 3, the lengths Ln of the air inlet channels 1 are different, and the theoretical time tn of the smoke in the detection area 2 entering the smoke detection chamber 3 from the air inlet channels 1 is n , which is the length Ln of each air inlet channel 1 divided by the wind speed Vn generated in the smoke detection chamber 3 due to the activation of the first guide device 4.

[0073] In some embodiments, the second air guide device 5 is installed in at least one air intake channel 1 .

[0074] In addition to smoke, incomplete combustion will also produce CO gas in a confined space. Therefore, an increase in CO gas concentration is also one of the signs of a fire. Figure 3-4As shown, it also includes a gas detection system, which includes a gas detection chamber 10 connected to the gas outlet end of the smoke detection chamber 3 through a first gas outlet pipe, and the first gas outlet pipe is used to transport the gas in the smoke detection chamber 3 to the gas detection chamber 10. It also includes a CO collection unit 11 arranged in the gas detection chamber 10 and connected to the control device 8. The CO collection unit 11 is used to collect the CO concentration in the gas detection chamber 10 and issue a CO alarm when the collected CO concentration value exceeds the first set concentration.

[0075] The first air outlet pipe is provided with a first switch valve 12 connected to the control device 8 for controlling the opening and closing state of the first air outlet pipe. Figure 4 As shown, the CO acquisition unit 11 is a tin dioxide semiconductor CO sensor. The detection resistor unit of the semiconductor CO sensor includes a detection resistor Rco connected in series and an adjustable resistor R1 connected to the control device 8. An alarm unit is connected in series between the adjustable resistor R1 and the voltage terminal V-, and the detection resistor Rco is electrically connected to the voltage terminal V+.

[0076] The gas detection system also includes a CO generating device 13 for releasing a set amount of CO gas into the gas detection chamber 10 when calibrating the CO acquisition unit 11 under set conditions. The CO generating device 13 is arranged in the gas detection chamber 10 and connected to the control device 8. The CO generating device 13 has a first exhaust port connected to the gas detection chamber 10. The first exhaust port is provided with a flow regulating valve 14 connected to the control device 8 for controlling the flow rate of released CO. The set conditions include any one of the following conditions: after the source of the fire is determined; after the CO acquisition unit 11 detects that the CO gas concentration value exceeds the first set concentration; after the temperature acquisition unit 21 detects that the air temperature value exceeds the set temperature; after the smoke acquisition unit 6 detects that the smoke concentration value exceeds the fourth set concentration, that is, after each system alarm ends, the calibration cycle can also be set as needed.

[0077] The control device 8 is also used to ensure that the residual CO gas in the gas detection chamber 10 is discharged when the CO collection unit 11 is calibrated, control the first switch valve 12 to close to ensure that the gas detection chamber 10 is in a sealed state, control the CO generation device 13 to start, and release a set amount of CO gas into the gas detection chamber 10 by controlling the opening time of the flow control valve 14. When the current value I collected by the CO collection unit 11 is different from the current preset value, adjust the resistance value of the detection resistor unit so that the current value re-collected by the CO collection unit 11 is equal to the current preset value, and the set amount of CO gas released is equal to the CO concentration corresponding to the current preset value, that is, the gas detection chamber 10 reaches the set concentration corresponding to the current preset value.

[0078] In this embodiment, when the current collected by the CO collection unit 11 is stable and the current value I is less than the current preset value, the control device 8 reduces the resistance value of the adjustable resistor until the re-collected current value is equal to the current preset value; when the current collected by the CO collection unit 11 is stable and the current value I is greater than the current preset value, the control device 8 increases the resistance value of the adjustable resistor until the re-collected current value is equal to the current preset value.

[0079] During calibration, since there may be residual CO gas in the gas detection chamber 10, in order to avoid affecting the calibration accuracy, if the CO collection unit 11 detects residual CO gas in the gas detection chamber 10, the CO gas in the gas detection chamber 10 can be exhausted by suctioning the gas detection chamber 10 through the second flow guide device 5 or blowing the gas detection chamber 10 through the first flow guide device 4.

[0080] like Figure 4 As shown, as the CO concentration in the gas detection chamber 10 gradually increases, the number of negatively charged oxygen ions decreases, causing the detection resistance Rco of the tin dioxide semiconductor sensor to decrease, and the current in the circuit to increase; when the CO concentration in the gas detection chamber 10 stabilizes at a certain concentration level, the current value in the circuit will stabilize at a certain value. Therefore, if there is a deviation in the CO acquisition unit 11, when the CO concentration in the gas detection chamber 10 stabilizes at a set concentration, there will be a deviation between the detected current value and the correct current preset value of the set concentration; by adjusting the resistance value of the adjustable resistor so that the current value at the set concentration is equal to the current preset value, the calibration of the CO acquisition unit 11 can be completed.

[0081] And the calibration setting of the CO acquisition unit 11 is to maintain the detection accuracy of the CO acquisition unit 11 after each system alarm ends, so as to make the system alarm more accurate and reduce the false alarm rate.

[0082] When locating the fire source, when the second guide device 5 is working, the first switch valve 12 is closed to ensure that CO gas and smoke are discharged from the air inlet channel 1, and to prevent CO gas and smoke from entering the gas detection chamber 10 and returning to the smoke detection chamber 3, which will cause inaccurate smoke detection; when the first guide device 4 in the air inlet channel 1 is working, the first switch valve 12 is opened. At this time, the smoke collection unit 6 and the CO collection unit 11 are required to detect the smoke and CO gas entering the cavity respectively.

[0083] In this embodiment, there is one control device 8, which is installed in the smoke detection chamber 3. The control device 8 is connected to each electronic component in an electrical manner, but wireless connection is not excluded.

[0084] In another embodiment, at least two control devices 8 are provided, which are installed in the smoke detection chamber 3 and the gas detection chamber 10 respectively. In order to improve the information interconnection of the system, multiple control devices 8 are communicatively connected.

[0085] In order to make the set amount of CO gas in the gas detection chamber 10 evenly distributed, the CO concentration at each location in the gas detection chamber 10 is equal to the set concentration corresponding to the preset current value, so as to improve the calibration precision and accuracy. The gas detection system includes a third flow guide device 15 arranged in the gas detection chamber 10 and connected to the control device 8, which is used to disperse the CO gas released in the gas detection chamber 10 when calibrating the CO collection unit 11, so that the released CO gas is evenly distributed in the gas detection chamber 10.

[0086] In this embodiment, the third flow guide device 15 is a stirrer or a fan, so that when the CO generating device 13 releases CO gas into the gas detection chamber 10, the third flow guide device 15 generates airflow or stirring. At this time, the CO collection unit 11 will detect the CO gas concentration in the gas detection chamber 10. If the collected current value is equal to the preset current value, it means that the CO collection unit 11 is in normal working condition and no calibration is required. When calibration is required, calibration can ensure that the CO collection unit 11 can accurately detect the CO concentration, and its accuracy can be repaired by adjusting the variable resistor when necessary. In theory, as long as the CO sensor that measures the CO concentration by utilizing the principle that semiconductor resistance changes with CO concentration can use the method of calibrating the CO collection unit 11 in this application.

[0087] Among them, by setting the opening time of the flow regulating valve 14, the valve opening of the flow regulating valve is set to obtain the set flow rate. Since the gas detection chamber 10 is in a sealed state during calibration, the opening time of the flow regulating valve 14 is adjusted to release a set amount of CO gas in the gas detection chamber 10. By controlling the start-up time of the third flow guide device 15, the CO gas is evenly distributed in the gas detection chamber 10, and the CO gas concentration in the gas detection chamber 10 is stabilized to the second set concentration, that is, the set concentration corresponding to the current preset value. Among them, the product of the set flow rate and the set time is equal to the mass of the CO gas, and the mass of the CO gas is divided by the volume of the gas detection chamber 10 to obtain the second set concentration, and the second set concentration is less than the first set concentration. In this embodiment, the second set concentration is 18.2-31.5μL / L, and the volume of the gas detection chamber 10 is set according to actual needs. The correspondence between the second set concentration of CO gas and the current preset value belongs to the prior art known in the art, and the size of the second set concentration can be artificially set as needed.

[0088] In order to ensure that the released CO gas is evenly distributed in the gas detection chamber 10, as one implementation method, the third flow guide device 15 is a fan, and the control device 8 starts the fan and controls the start-up time t of the fan. 启 , the CO gas released in the gas detection chamber 10 is dispersed until the current collected by the CO collection unit 11 is stable. Since the CO concentration value corresponds to the collected current value, when the current value is stable, it means that the CO concentration has also been stable. The volume of the gas detection chamber 10 is V 腔 , the wind speed caused by the fan starting is V 导 , the cross-sectional area of ​​the fan duct is s, where t 启 =2V 腔 ÷S÷V 导 .

[0089] Preferably, it also includes a gas processing system, which includes a gas processing chamber 16 connected to the gas detection chamber 10 through a second gas outlet pipe, a CO sensor unit 17 for collecting CO concentration, and a CO absorption device 18 for absorbing CO gas entering the gas processing chamber 16, an exhaust pipe on the gas outlet end of the gas processing chamber 16, a second switch valve 19 is provided on the exhaust pipe, and a third switch valve 20 is provided on the second gas outlet pipe. The CO sensor unit 17, the second switch valve 19, and the third switch valve 20 are respectively connected to the control device 8. The control device 8 is also used to control the third switch valve 20 to close before controlling the CO generating device 13 to start, and is also used to control the second switch valve 19 to open when the CO concentration value in the gas processing chamber 16 collected by the CO sensor unit 17 is lower than the third set concentration, wherein the third set concentration is lower than the first set concentration. During calibration, the first switch valve 12 and the third switch valve 20 are controlled to be closed to ensure that the gas detection chamber 10 is in a sealed state, and the calibration is carried out normally, and the second switch valve 19 is in a normally closed state.

[0090] In this embodiment, the CO absorption device 18 is a filling tower provided with a gas adsorption medium, and the gas adsorption medium is activated carbon. The high surface area and pore structure of the activated carbon are used to adsorb CO, thereby purifying the gas. The CO entering the gas treatment chamber 16 during calibration or fire can be absorbed and processed by the CO absorption device 18.

[0091] As one implementation method, during calibration, the first switch valve 12 and the third switch valve 20 are opened first to ensure that the CO in the gas detection chamber 10 is exhausted and then the first switch valve 12 and the third switch valve 20 are closed, so as to increase the exhaust efficiency.

[0092] As another embodiment, during calibration, the first switch valve 12 is closed and the third switch valve 20 is opened to discharge all the CO in the gas detection chamber 10 into the gas processing chamber 16. After the CO is fully adsorbed, when the CO sensor unit 17 detects that the CO concentration value in the gas processing chamber 16 is lower than the third set concentration, the second switch valve 19 is opened to ensure environmental protection and pollution-free.

[0093] In other embodiments, the gas processing chamber 16 is connected to the smoke detection chamber 3 via a second gas outlet pipe, and a third switch valve 20 is provided on the second gas outlet pipe.

[0094] Since the smoke generated by the fire will increase the indoor temperature, in order to facilitate monitoring, a temperature collection unit 21 installed in the air intake channel 1 is also included. The temperature collection unit 21 is connected to the control device 8 and is used to collect the air temperature in the air intake channel 1 and issue a high temperature alarm when the collected air temperature exceeds the set temperature. The temperature collection unit 21 is set close to the air inlet of the air intake channel 1, and is used to detect the air temperature of each air intake channel 1 before entering the smoke detection chamber 3. It can also monitor the ambient temperature in the detection area 2, which is helpful for fire monitoring and alarm triggering.

[0095] In another embodiment, the temperature collection unit 21 may be installed in the area to be detected 2 to collect the air temperature in the area to be detected 2.

[0096] Although the actual time t and the theoretical time t n The setting condition that the absolute value of the difference is the smallest can only determine one fire point. However, with the assistance of temperature detection, the air in the intake passage 1 with abnormally high temperature can be monitored to further determine the locations of multiple fire sources, and the detection failure caused by the failure of a single collection unit can be avoided, so as to expand its scope of application and improve the detection accuracy.

[0097] The smoke collection unit 6, the CO collection unit 11 and the temperature collection unit 21 are respectively integrated with alarm units. The system alarms include high temperature alarm, smoke alarm, CO alarm, fire alarm and other alarm signals. The alarms can be prompted by sound prompts, light prompts, SMS reminders and other prompts. Among them, the alarm signals such as CO alarm, smoke alarm, high temperature alarm will not affect the location of the fire source.

[0098] Each acquisition unit can be disposed in its entirety in the corresponding cavity, or the sensing portion of the sensing unit can be disposed in the corresponding cavity, and the electrical connection portion thereof can be disposed outside the corresponding cavity.

[0099] like Figure 5-7 As shown, the present invention also provides a fire source detection method of a smoke detection system, which is applied to the above-mentioned smoke detection system and includes the following steps:

[0100] When the system is turned on, the control device 8 controls the first guide device 4 to start, so that the air in different detection areas 2 enters the smoke detection chamber 3 through the corresponding air inlet channels 1.

[0101] When the smoke collection unit 6 detects smoke in the smoke detection chamber 3 for the first time, the control device 8 controls the first guide device 4 to close and controls the second guide device 5 to start for a preset time and then stop, so that the smoke is completely discharged from the smoke detection chamber 3 and the air intake channel 1 and then the second guide device 5 is closed. The control device 8 simultaneously controls the timing unit 7 to start timing.

[0102] The control device 8 controls the preset duration of the activation of the second guide device 5 to ensure that the smoke is completely discharged from the smoke detection chamber 3 and the air inlet passage 1 after the smoke collection unit 6 detects smoke in the smoke detection chamber 3 for the first time; wherein the preset duration is t 吹 =2*Ln / V 吹 , the length of the air inlet channel 1 is Ln, and the wind speed caused by the activation of the second flow guide device 5 is V 吹 .

[0103] The control device 8 controls the first flow guiding device 4 to start, so that the air in different to-be-detected areas 2 re-enters the smoke detection chamber 3 through the corresponding air inlet passages 1 .

[0104] When the smoke collecting unit 6 detects smoke in the smoke detecting chamber 3 again, the control device 8 controls the timing unit 7 to stop timing, and the control device 8 obtains the actual time t of smoke collection.

[0105] The control device 8 obtains the theoretical time t of smoke in the detection area 2 entering the smoke detection chamber 3 from each air inlet channel 1 n , and compare the actual time t with each theoretical time t n Compare the actual time t and the theoretical time t n The detection area 2 corresponding to the air inlet channel 1 with the smallest absolute value of the difference is the source of the fire, and a fire alarm is prompted. Among them, the theoretical time t n Equal to the length L of each intake channel 1 n divided by the wind speed V generated in each air inlet channel 1 due to the activation of the corresponding first flow guide device 4 n .

[0106] The CO concentration in the gas detection chamber 10 is collected by the CO collection unit 11. When the CO concentration value collected by the CO collection unit 11 exceeds the first set concentration, a CO alarm is prompted. The air temperature in the detection area 2 or the air inlet channel 1 is collected by the temperature collection unit 21. When the air temperature exceeds the set temperature, a high temperature alarm is prompted. When the smoke concentration value collected by the smoke collection unit 6 exceeds the fourth set concentration, a smoke alarm is prompted. Among them, the fire alarm, CO alarm, high temperature alarm and smoke alarm are all system alarm signals.

[0107] like Figure 1-3 As shown, in order to prevent the CO collection unit 11 from affecting its detection accuracy due to the increase in CO concentration, the CO collection unit 11 needs to be calibrated. The specific steps are as follows:

[0108] When the set conditions are met, it is ensured that the residual CO gas in the gas detection chamber 10 is discharged, and the set conditions are after each system alarm ends.

[0109] The control device 8 controls the first switch valve 12 and the third switch valve 20 to close, ensuring that the gas detection chamber 10 remains sealed. The control device 8 controls the CO generation device 13 to start, controls the start-up time of the flow control valve 14, and releases a set amount of CO gas into the gas detection chamber 10. The control device 8 disperses the CO gas released in the gas detection chamber 10 by starting the third flow guide device 15 and controlling the start-up time of the third flow guide device 15 until the released CO gas is evenly distributed in the gas detection chamber 10, that is, the current value collected by the CO collection unit 11 is stable. When the current value collected by the CO collection unit 11 is different from the current preset value, the control device 8 adjusts the resistance value of the detection resistor unit so that the current value re-collected by the CO collection unit 11 is equal to the current preset value, and the set amount of CO gas released is equal to the CO concentration corresponding to the current preset value, that is, the gas detection chamber 10 reaches the set concentration corresponding to the current preset value.

[0110] Among them, by setting the opening time of the flow regulating valve 14, the valve opening of the flow regulating valve is set to obtain the set flow rate. Since the gas detection chamber 10 is in a sealed state during calibration, the CO gas is evenly distributed in the gas detection chamber 10 by adjusting the start-up time of the third flow guide device 15, so that the CO gas concentration in the gas detection chamber 10 is stabilized to the second set concentration, that is, the set concentration corresponding to the current preset value. Among them, the product of the set flow rate and the set time is equal to the mass of the CO gas, and the mass of the CO gas is divided by the volume of the gas detection chamber 10 to obtain the second set concentration, and the second set concentration is less than the first set concentration. In this embodiment, the second set concentration is 18.2-31.5μL / L, and the volume of the gas detection chamber 10 is set according to actual needs. The correspondence between the second set concentration of CO gas and the current preset value belongs to the prior art known in the art, and the size of the second set concentration can be artificially set as needed.

[0111] like Figure 4 As shown, when the current collected by the CO collection unit 11 is stable and the current value I is less than the current preset value, it means that the detection resistance Rco unit of the CO collection unit 11 is too large, and the control device 8 reduces the resistance value of the adjustable resistor R1 by adjusting the resistance value until the re-collected current value is equal to the current preset value; when the current collected by the CO collection unit 11 is stable and the current value I is greater than the current preset value, it means that the detection resistance Rco unit of the CO collection unit 11 is too small, and the control device 8 increases the resistance value of the adjustable resistor R1 by adjusting the resistance value of the adjustable resistor R1 until the re-collected current value is equal to the current preset value.

[0112] Wherein, the volume of the gas detection chamber 10 is V 腔 , the wind speed caused by the activation of the third guide device 15 is V 导 The cross-sectional area of ​​the air duct of the third flow guide device 15 is s, t 启 =2V 腔 ÷S÷V 导 .

[0113] When it is necessary to discharge the CO gas in the gas detection chamber 10, the control device 8 controls the closing of the second switch valve 19, and waits for the CO absorption device 18 to fully absorb the CO gas entering the gas processing chamber 16, until the CO concentration value in the gas detection chamber 10 collected by the CO sensor unit 17 is lower than the third set concentration, the control device 8 controls the second switch valve 19 to open.

[0114] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present invention.

Claims

1. A smoke detection system, characterized in that: include: An air inlet channel (1), at least two of which are provided, each of which is connected to a corresponding area to be detected (2); a smoke detection chamber (3), which is in communication with the air inlet passage (1) respectively; A first flow guide device (4) is used to draw air in the area to be detected (2) into the smoke detection chamber (3) through the air inlet channel (1); A second flow guide device (5) is used to discharge the air in the air inlet passage (1) and the smoke detection chamber (3); A smoke collection unit (6) for detecting the smoke concentration in the smoke detection chamber (3); A timing unit (7) is used to start timing when the smoke collection unit (6) detects smoke for the first time and smoke in the smoke detection chamber (3) and the air inlet passage (1) is exhausted, and then stop timing when the smoke collection unit (6) detects smoke again, so as to obtain an actual time t of smoke collection; A control device (8) is connected to the first flow guiding device (4), the second flow guiding device (5), the smoke collecting unit (6) and the timing unit (7) respectively; it is used to control the first flow guiding device (4) to start, until the smoke collecting unit (6) detects smoke concentration information for the first time, then controls the first flow guiding device (4) to shut down, starts the second flow guiding device (5) for a preset time and then shuts down, restarts the first flow guiding device (4), and determines the source of the fire when the smoke collecting unit (6) detects smoke information again; it is also used to obtain the actual time t of smoke collection and the theoretical time t of smoke in the detection area (2) entering the smoke detection chamber (3) from each air inlet channel (1) when determining the source of the fire. n , and compare the actual time t with the theoretical time t n The actual time t is compared with the theoretical time t n The detection area (2) corresponding to the air intake channel (1) with the smallest absolute value of the difference is the source of the fire; wherein the theoretical time t corresponding to each air intake channel (1) n Each is different.

2. The smoke detection system according to claim 1, characterized in that: It also comprises a gas detection system, the gas detection system comprising a gas detection chamber (10) connected to the smoke detection chamber (3), and a CO collection unit (11) connected to the control device (8); the CO collection unit (11) is used to collect the CO concentration in the gas detection chamber (10).

3. The smoke detection system according to claim 2, characterized in that: A first air outlet pipe is provided between the smoke detection chamber (3) and the gas detection chamber (10), and a first switch valve (12) for controlling the opening and closing state of the first air outlet pipe is provided on the first air outlet pipe; The gas detection system further comprises a CO generating device (13) for releasing a set amount of CO gas into the gas detection chamber (10) when calibrating the CO collection unit (11) under set conditions; The control device (8) is respectively connected to the detection resistor unit, the first switch valve (12), and the CO generating device (13) of the CO collecting unit (11); and is also used to ensure that the CO gas remaining in the gas detection chamber (10) is discharged when the CO collecting unit (11) is calibrated, control the first switch valve (12) to close, and control the CO generating device (13) to start; when the current value collected by the CO collecting unit (11) is different from the current preset value, adjust the resistance value of the detection resistor unit so that the current value re-collected by the CO collecting unit (11) is equal to the current preset value; The set amount of CO gas released is equal to the CO concentration corresponding to the preset value of the current.

4. The smoke detection system according to claim 3, characterized in that: The CO collection unit (11) is a semiconductor CO sensor, and the detection resistor unit comprises a detection resistor connected in series and an adjustable resistor connected to the control device (8); When the current collected by the CO collection unit (11) is stable and the current value is less than the current preset value, the control device (8) reduces the resistance value of the adjustable resistor until the current value collected again by the CO collection unit (11) is equal to the current preset value; when the current collected by the CO collection unit (11) is stable and the current value is greater than the current preset value, the control device (8) increases the resistance value of the adjustable resistor until the current value collected again by the CO collection unit (11) is equal to the current preset value.

5. The smoke detection system according to claim 3, characterized in that: The gas detection system further comprises a third flow guide device (15) connected to the control device (8), which is used to disperse the CO gas released in the gas detection chamber (10) when calibrating the CO collection unit (11); The control device (8) starts the third flow guiding device (15) and controls the start-up time t of the third flow guiding device (15). 启 , dispersing the CO gas released in the gas detection chamber (10) until the current value collected by the CO collection unit (11) is stable; Wherein, the volume of the gas detection chamber (10) is V 腔 The wind speed caused by the activation of the third flow guiding device (15) is V 导 The cross-sectional area of ​​the air duct of the third flow guide device (15) is S, t 启 =2V 腔 ÷S÷V 导 .

6. The smoke detection system according to claim 2, characterized in that: It also includes a gas processing system, which includes a gas processing chamber (16), a CO sensor unit (17) and a CO absorption device (18); The gas processing chamber (16) is provided with an exhaust pipe, and the exhaust pipe is provided with a second switch valve (19); the gas processing chamber (16) is connected with at least one of the gas detection chamber (10) and the smoke detection chamber (3) through the second exhaust pipe, and the second exhaust pipe is provided with a third switch valve (20); The CO sensing unit (17) is used to collect the CO concentration in the gas processing chamber (16), and the CO absorption device (18) is used to absorb the CO gas entering the gas processing chamber (16); The control device (8) is respectively connected to the CO sensor unit (17), the second switch valve (19), and the third switch valve (20); and is used to control the third switch valve (20) to close before the CO generating device (13) is started, and is also used to control the second switch valve (19) to open when the CO concentration value collected by the CO sensor unit (17) is lower than a third set concentration.

7. The smoke detection system according to any one of claims 3 to 6, characterized in that: It also comprises a temperature collection unit (21) connected to the control device (8) and used for collecting the air temperature in the area to be detected (2) or in the air intake passage (1).

8. The smoke detection system according to claim 7, characterized in that: The setting conditions include any one of the following conditions: After the source of the fire is determined; After the CO collection unit (11) detects that the CO gas concentration value exceeds a first set concentration; After the temperature acquisition unit (21) detects that the air temperature value exceeds the set temperature; After the smoke collecting unit (6) detects that the smoke concentration value exceeds a fourth set concentration.

9. The smoke detection system according to any one of claims 1 to 6, characterized in that: The first flow guide device (4) is installed in at least one of the air intake channel (1) and the smoke detection chamber (3), and the second flow guide device (5) is installed in the air intake channel (1) or the smoke detection chamber (3); each of the air intake channel (1) and the smoke detection chamber (3) is provided with a first flow guide device (4), and before the timing unit (7) starts timing, the first flow guide device (4) in the smoke detection chamber (3) is started, and the first flow guide device (4) in the air intake channel (1) is closed; when the timing unit (7) starts timing, the first flow guide device (4) in the smoke detection chamber (3) is closed, and the first flow guide device (4) in the air intake channel (1) is started; The theoretical time t n Equal to the length L of each intake channel (1) n divided by the wind speed V generated in each air inlet channel (1) due to the activation of the corresponding first flow guide device (4) n .

10. A method for detecting a fire source of a smoke detection system, characterized in that: The smoke detection system comprises an air intake channel (1), at least two of which are provided, each of which is connected to a corresponding area to be detected (2); a smoke detection chamber (3), which is connected to the air intake channel (1) respectively; a first flow guide device (4), which is used to suck the air in the area to be detected (2) into the smoke detection chamber (3) through the air intake channel (1); a second flow guide device (5); a smoke collection unit (6), which is used to detect the smoke concentration in the smoke detection chamber (3); a timing unit (7); and a control device (8), which is respectively connected to the first flow guide device (4), the second flow guide device (5), the smoke collection unit (6) and the timing unit (7); The fire source detection method comprises the following steps: The control device (8) controls the first flow guiding device (4) to start; When the smoke collection unit (6) detects smoke in the smoke detection chamber (3) for the first time, the control device (8) controls the first flow guide device (4) to close and controls the second flow guide device (5) to start for a preset time and then close, so that smoke is discharged from the smoke detection chamber (3) and the air intake passage (1), and the control device (8) controls the timing unit (7) to start timing; The control device (8) controls the first flow guide device (4) to start, so that the air in the detection area (2) re-enters the smoke detection chamber (3) through the corresponding air inlet channel (1); When the smoke collection unit (6) detects smoke in the smoke detection chamber (3) again, the control device (8) controls the timing unit (7) to stop timing, and the control device (8) obtains the actual time t of smoke collection; The control device (8) obtains the theoretical time t for smoke in the detection area (2) to enter the smoke detection chamber (3) from each air inlet channel (1). n , and compare the actual time t with each theoretical time t n Compare the actual time t and the theoretical time t n The detection area (2) corresponding to the air intake channel (1) with the smallest absolute value of the difference is the source of the fire, and a fire alarm is prompted.

11. The method for detecting the source of fire of a smoke detection system according to claim 10, characterized in that: The control device (8) controls the preset duration of activation of the second flow guiding device (5) to ensure that after the smoke collecting unit (6) detects smoke in the smoke detection chamber (3) for the first time, the smoke is completely discharged from the smoke detection chamber (3) and the air inlet passage (1); Among them, the preset time t 吹 =2*Ln / V 吹 The length of the air inlet channel 1 is Ln, and the wind speed caused by the activation of the second flow guide device (5) is V 吹 .

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