A multi-channel measurement-type pyrolysis particle fire detector and detection method

Abstract

This invention discloses a multi-channel measurement-type pyrolysis particle fire detector and detection method. After detecting that the actual concentration of pyrolysis particles is greater than or equal to a set pyrolysis particle concentration, the fire detector detects that the actual temperature change trend, the actual concentration change trend of pyrolysis particles, and the actual concentration change trend of a specific gas within a set time period meet a first set condition. Furthermore, if at least one of the following occurs within the set time period: the maximum value of the actual gas temperature exceeds a temperature alarm threshold, the maximum value of the actual pyrolysis particle concentration exceeds a pyrolysis particle concentration alarm threshold, and the maximum value of the actual concentration of a specific gas exceeds a specific gas concentration alarm threshold, then a fire is determined to have occurred at the location of at least one sampling tube. This invention can simultaneously perform early fire detection in multiple different areas, locate and detect abnormal areas, and improve the high false alarm rate of existing fire detectors, thereby increasing the accuracy of fire detection.

Description

Technical Field

[0001] This invention relates to the field of fire detection technology, and in particular to a multi-channel measurement-type pyrolysis particle fire detector and detection method. Background Technology

[0002] Regardless of the cause, electrical fires initially manifest as objects heating up and releasing smoke particles and gases, producing an unpleasant odor. Existing fire detectors can detect this type of fire, but most of them use passive detection based on the molecular diffusion principle. These detectors suffer from problems such as long detection time, a single detection path, unsuitability for multi-compartment cabinets, flawed fire alarm logic, high false alarm rate, and low detection sensitivity. Summary of the Invention

[0003] This invention provides a multi-channel measurement-type pyrolysis particle fire detector and detection method, which can simultaneously perform early fire detection in multiple different areas, locate and detect abnormal areas, improve the problem of high false alarm rate of existing fire detectors, and improve the accuracy of fire detection.

[0004] According to one aspect of the present invention, a multi-channel measurement-type pyrolysis particle fire detector is provided, the fire detector comprising: multiple sampling tubes, multiple gas sampling components, a gas detection chamber, a control module, and a gas detection module disposed within the gas detection chamber;

[0005] The gas sampling component corresponds to the sampling tube and is detachably connected. The gas sampling component is used to collect the gas at the location of its corresponding sampling tube when it is turned on.

[0006] Each of the gas sampling components is connected to the gas detection chamber, which is used to contain the gas collected by each of the gas sampling components;

[0007] The gas detection module is used to detect the actual temperature of the gas, the actual concentration of pyrolysis particles, and the concentration of a specific gas in the gas detection chamber.

[0008] The control module is electrically connected to the gas detection module. The control module is used to determine that a fire has occurred at the location of at least one of the sampling tubes when, after detecting that the actual concentration of the pyrolysis particles is greater than or equal to a set pyrolysis particle concentration, the change trend of the actual temperature of the gas, the change trend of the actual concentration of the pyrolysis particles, and the change trend of the actual concentration of a specific gas within a set time period meet a first set condition, and when at least one of the following is detected within the set time period: the maximum value of the actual temperature of the gas is greater than a temperature alarm threshold, the maximum value of the actual concentration of the pyrolysis particles is greater than a pyrolysis particle concentration alarm threshold, and the maximum value of the actual concentration of the specific gas is greater than a specific gas concentration alarm threshold.

[0009] Optionally, the first setting condition is that, within the set time period, the actual temperature shows an increasing trend, the actual concentration of pyrolysis particles shows an increasing trend, and the actual concentration of the specific gas shows an increasing trend.

[0010] Optionally, the control module is further configured to determine that a fire has occurred at the location of at least one of the sampling tubes when the actual concentration of the pyrolysis particles is detected to be greater than or equal to the set pyrolysis particle concentration, and the actual temperature change trend, the actual concentration change trend of the pyrolysis particles, and the actual concentration change trend of the specific gas within the set time period do not meet the first set condition.

[0011] Optionally, the control module is further configured to determine that a fire has occurred at the location of at least one of the sampling tubes when the actual concentration of the pyrolysis particles is greater than or equal to a set pyrolysis particle concentration, the change trend of the actual temperature of the gas, the change trend of the actual concentration of the pyrolysis particles, and the change trend of the actual concentration of a specific gas during the set time period do not meet the first set condition, and the actual concentration of the pyrolysis particles is less than the pyrolysis particle concentration alarm threshold; when the first factor is greater than or equal to a pyrolysis particle warning factor, and the sum of the first factor, the second factor, and the third factor is greater than or equal to 1.

[0012] The first factor is determined according to the following formula:

[0013] δ1=F C1 / F C0 Where δ1 is the first factor, F C1 F represents the actual concentration of pyrolysis particles. C0 The pyrolysis particle concentration alarm threshold is defined as follows;

[0014] The second factor is determined according to the following formula:

[0015] δ2=(1-λ)F v1 / F v0 , λ=F C0 / F, where δ2 is the second factor, λ is the pyrolysis particle early warning factor, and F is the set detector alarm threshold. v1 For the actual concentration of a specific gas, F v0 For specific gas concentration alarm thresholds;

[0016] The third factor is determined according to the following formula:

[0017] δ3=(1-λ)(F T1 -F TA ) / (F T0-F TA ), where δ3 is the third factor, F T1 F represents the actual gas temperature. T0 F is the temperature alarm threshold. TA The actual gas temperature detected by the gas detection module at the initial stage of detection.

[0018] Optionally, the fire detector provided in this embodiment also includes a display module;

[0019] The control module is electrically connected to the display module. The control module is used to control the display module to display the actual temperature of the gas in the gas detection chamber, the actual concentration of pyrolysis particles, and the actual concentration of a specific gas. It is also used to control the display module to display a fire alarm signal when a fire is determined to occur at the location of at least one of the sampling tubes.

[0020] Optionally, the fire detector provided in this embodiment also includes a wind cavity, a fan, and an anemometer located in the wind cavity;

[0021] Each of the gas sampling components is connected to the air cavity, the air cavity is connected to the blower, and the blower is connected to the gas detection chamber;

[0022] The fan is used to carry the gas collected by the gas collection component into the gas detection chamber;

[0023] The anemometer is used to detect the actual wind speed inside the air cavity;

[0024] The control module is electrically connected to the anemometer, and the control module is used to determine that the fire detector is faulty when the actual wind speed is less than the set wind speed.

[0025] Optionally, the fire detector also includes a housing;

[0026] The gas sampling assembly includes an air inlet port, an air inlet pipe, and a control valve;

[0027] The air inlet port of each gas sampling component is located on the housing, and the air inlet pipe and control valve of each gas sampling component are located inside the housing;

[0028] The first end of the air inlet port is detachably connected to the sampling tube, and the second end of the air inlet port is connected to the first end of the air inlet pipe;

[0029] The second end of the air intake pipe is connected to the control valve;

[0030] The control valve of each gas sampling component is connected to the air cavity, and the control valve is used to control the flow rate of gas in the air inlet pipe into the air cavity.

[0031] Optionally, the control valve includes a valve body, a motor, a valve core, a first sealing ring, and a second sealing ring;

[0032] The valve body includes a receiving cavity and an air inlet cavity; the receiving cavity and the air inlet cavity are interconnected.

[0033] The valve core is disposed within the receiving cavity; the valve core has a through hole at its center.

[0034] Both the first sealing ring and the second sealing ring are placed on the outer surface of the valve core, and the first sealing ring and the second sealing ring are used to fill the gap between the valve core and the accommodating cavity;

[0035] The upper end of the valve core is provided with a rotating hole, which is connected to the rotating shaft of the motor located on the upper surface of the valve body.

[0036] The motor is used to rotate after being powered on, thereby driving the corresponding valve core to rotate.

[0037] Optionally, a filter is provided at the inner cross-section of the air intake pipe;

[0038] The filter is used to filter out interfering substances from the gas entering the intake pipe.

[0039] According to another aspect of the present invention, a multi-channel measurement-type pyrolysis particle fire detection method is provided, which is applied to the multi-channel measurement-type pyrolysis particle fire detector provided in any embodiment of the present invention;

[0040] The fire detection method includes:

[0041] The actual temperature of the gas, the actual concentration of pyrolysis particles, and the concentration of a specific gas are detected within the gas detection chamber.

[0042] Detect whether the actual concentration of the pyrolysis particles is greater than or equal to the set concentration of pyrolysis particles;

[0043] If so, then check whether the actual temperature change trend of the gas, the actual concentration change trend of pyrolysis particles, and the actual concentration change trend of a specific gas within the set time period meet the first set condition.

[0044] If so, determine whether at least one of the following is detected within the set time period: the maximum value of the actual temperature of the gas is greater than the temperature alarm threshold, the maximum value of the actual concentration of pyrolysis particles is greater than the pyrolysis particle concentration alarm threshold, and the maximum value of the actual concentration of the specific gas is greater than the specific gas concentration alarm threshold.

[0045] If so, then it is determined that a fire occurred at least at the location of the sampling tube.

[0046] This embodiment provides a multi-channel measurement-type pyrolysis particle fire detector. The detector includes multiple sampling tubes and corresponding gas sampling components, as well as gas detection chambers connected to each sampling component. It also includes a gas detection module located within the gas detection chamber and a control module connected to the gas detection module. The multiple sampling tubes can be placed at different locations to sample gas from multiple different locations, thereby detecting fire conditions in multiple different areas. The gas collected by the sampling tubes can be transmitted to the gas detection chamber through the gas sampling components. Positioning the gas detection module within the gas detection chamber allows for accurate detection of the actual temperature of the gas, the actual concentration of specific gases, and the actual concentration of pyrolysis particles within the chamber. After detecting that the actual concentration of pyrolysis particles is greater than or equal to a set pyrolysis particle concentration, the control module does not directly determine that a fire has occurred at the location of the sampling tube. Instead, it continues to monitor the trends of actual temperature change, actual concentration change, and actual concentration change of a specific gas within a set time period to see if they meet a first set condition. If the first set condition is met, and at least one of the following occurs within the set time period: the maximum actual temperature of the gas exceeds a temperature alarm threshold, the maximum actual concentration of pyrolysis particles exceeds a pyrolysis particle concentration alarm threshold, or the maximum actual concentration of a specific gas exceeds a specific gas concentration alarm threshold, then a fire is determined to have occurred at the location of at least one sampling tube. In summary, the multi-channel measurement-type pyrolysis particle fire detector provided in this embodiment can simultaneously perform early fire detection in multiple different areas, locate and detect abnormal areas, and improve the high false alarm rate of existing fire detectors, thus increasing the accuracy of fire detection.

[0047] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0049] Figure 1 This is a schematic diagram of the structure of a multi-channel measurement-type pyrolysis particle fire detector according to an embodiment of the present invention;

[0050] Figure 2 This is a schematic diagram of the structure of another multi-channel measurement-type pyrolysis particle fire detector provided according to an embodiment of the present invention;

[0051] Figure 3 This is a schematic diagram of the structure of another multi-channel measurement-type pyrolysis particle fire detector provided according to an embodiment of the present invention;

[0052] Figure 4 This is a schematic diagram of the structure of another multi-channel measurement-type pyrolysis particle fire detector provided according to an embodiment of the present invention;

[0053] Figure 5 This is a schematic diagram of the housing structure of a multi-channel measurement-type pyrolysis particle fire detector according to an embodiment of the present invention;

[0054] Figure 6 This is an exploded structural diagram of a control valve according to an embodiment of the present invention;

[0055] Figure 7 This is a flowchart illustrating a multi-channel measurement-based pyrolysis particle fire detection method according to an embodiment of the present invention.

[0056] Figure 8 This is a flowchart illustrating another multi-channel measurement-based pyrolysis particle fire detection method provided by an embodiment of the present invention. Detailed Implementation

[0057] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0058] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0059] Figure 1 This is a schematic diagram of a multi-channel measurement-type pyrolysis particle fire detector according to an embodiment of the present invention. (Refer to...) Figure 1The fire detector provided in this embodiment includes: multiple sampling tubes 110, multiple gas sampling components 120, a gas detection chamber 130, a control module 140, and a gas detection module 150 disposed within the gas detection chamber 130; each gas sampling component 120 corresponds to and is detachably connected to a sampling tube 110, and the gas sampling component 120 is used to collect the gas at the location of its corresponding sampling tube 110 when it is connected; each gas sampling component 120 is connected to the gas detection chamber 130, and the gas detection chamber 130 is used to contain the gas collected by each gas sampling component 120; the gas detection module 150 is used to detect the actual temperature of the gas in the gas detection chamber 130, the actual concentration of pyrolysis particles, and the concentration of a specific gas. The control module 140 is electrically connected to the gas detection module 150. The control module 140 is used to determine that a fire has occurred at the location of at least one sampling tube 110 when the actual concentration of pyrolysis particles is detected to be greater than or equal to the set pyrolysis particle concentration, and the actual temperature change trend, the actual concentration change trend of the gas, and the actual concentration change trend of a specific gas meet the first set condition within a set time period, and when at least one of the following is detected within the set time period: the maximum value of the actual temperature of the gas is greater than the temperature alarm threshold, the maximum value of the actual concentration of pyrolysis particles is greater than the pyrolysis particle concentration alarm threshold, and the maximum value of the actual concentration of a specific gas is greater than the specific gas concentration alarm threshold.

[0060] Specifically, multiple sampling tubes 110 can be placed in multiple different locations to collect gas from multiple different locations, allowing the fire detector to simultaneously detect whether a fire has occurred in multiple different locations. Therefore, the fire detector provided in this embodiment is applicable to the early detection of fires in the interior and exterior of modular cabinets and multi-compartment cabinets. In this embodiment, the sampling tubes 110 are detachably connected to the gas sampling assembly 120, allowing the sampling tubes 110 to be unloaded from the gas sampling assembly 120 when the fire detector is not in use, thus facilitating the storage of the fire detector. The length of the sampling tubes 110 can be set according to actual needs.

[0061] When the gas sampling assembly 120 is on, the gas entering the sampling tube 110 can pass through the gas sampling assembly 120 into the gas detection chamber 130, and all the gas passing through the gas sampling assemblies 120 enters the same gas detection chamber 130. When the gas sampling assembly 120 is off, the gas entering the sampling tube 110 cannot pass through the gas sampling assembly 120 into the gas detection chamber 130. The control module 140 can be connected to each gas sampling assembly 120, and the control module 140 can control each gas sampling assembly 120 to be on or off. When not all gas sampling assemblies 120 of the fire detector are used, the control module 140 can control some gas sampling assemblies 120 to be on and others to be off. For example, the fire detector has five sampling tubes 110 and five gas sampling assemblies 120. In actual application, only three sampling tubes 110 need to be placed in different positions. At this time, three gas sampling assemblies 120 can be controlled to be on and the other two gas sampling assemblies 120 can be controlled to be off.

[0062] The gas detection module 150 may include a temperature detection unit, a specific gas detection unit, and a pyrolysis particle detection unit. The temperature detection unit may include a temperature sensor to detect the actual temperature of the gas within the gas detection chamber 130. The specific gas detection unit may include an electrochemical sensor to detect the actual concentration of a specific gas within the gas detection chamber 130. This specific gas may be a gas harmful to humans and the environment, generated during a fire. The pyrolysis particle detection unit includes a laser particle sensor to detect the actual concentration of pyrolysis particles within the gas detection chamber 130, thereby detecting the release of pyrolysis particles in the monitored area. The laser particle sensor provided in this embodiment can detect particles with a diameter less than 1 μm. Particles with a diameter less than 1 μm are released in the very early stages of a fire; therefore, the laser particle sensor provided in this embodiment can achieve very early fire detection. The control module 140 is electrically connected to the temperature sensor, the electrochemical sensor, and the laser particle sensor. The control module 140 can acquire the actual temperature detected by the temperature sensor, the actual concentration of the specific gas detected by the electrochemical sensor, and the actual concentration of pyrolysis particles detected by the laser particle sensor.

[0063] When the control module 140 detects that the actual concentration of pyrolysis particles is greater than the set pyrolysis particle concentration, it indicates that there is a fire hazard at the location of at least one sampling tube 110. To avoid false alarms from the fire detector, the control module 140 continues to monitor the changing trends of the actual temperature of the gas in the gas detection chamber 130, the actual concentration of pyrolysis particles, and the actual concentration of a specific gas within a set time period. When the changing trends of the three parameters meet the first set condition, and the maximum value of the detected gas temperature within the set time period is greater than the temperature alarm threshold, the maximum value of the actual concentration of pyrolysis particles is greater than the pyrolysis particle concentration alarm threshold, and the maximum value of the actual concentration of the specific gas is greater than the specific gas concentration alarm threshold, it can be determined that a fire has occurred at the location of at least one sampling tube 110. Therefore, the fire detector provided in this embodiment increases the conditions for determining the occurrence of a fire and improves the accuracy of fire detection. The changing trends of the three parameters meeting the first set condition can be defined as all three parameters showing an upward trend. The duration of the set time period, the temperature alarm threshold, the pyrolysis particle concentration alarm threshold, and the specific gas concentration alarm threshold can all be set by the user according to actual conditions. The pyrolysis particle concentration is related to the actual number of sampling tubes 110 used. For example, the pyrolysis particle concentration is set to be equal to F / N, where F can refer to the alarm threshold of the detector, which can be set by the user, and N represents the actual number of sampling tubes 110 used.

[0064] The fire detector provided in this embodiment may also include an alarm module. The control module 140 is connected to the alarm module. When the control module 140 determines that a fire has occurred at the location of at least one sampling tube 110, it can control the alarm module to issue a first alarm prompt to remind staff to extinguish the fire in time.

[0065] This embodiment provides a multi-channel measurement-type pyrolysis particle fire detector. The detector includes multiple sampling tubes and corresponding gas sampling components, as well as gas detection chambers connected to each sampling component. It also includes a gas detection module located within the gas detection chamber and a control module connected to the gas detection module. The multiple sampling tubes can be placed at different locations to sample gas from multiple different locations, thereby detecting fire conditions in multiple different areas. The gas collected by the sampling tubes can be transmitted to the gas detection chamber through the gas sampling components. Positioning the gas detection module within the gas detection chamber allows for accurate detection of the actual temperature of the gas, the actual concentration of specific gases, and the actual concentration of pyrolysis particles within the chamber. After detecting that the actual concentration of pyrolysis particles is greater than or equal to a set pyrolysis particle concentration, the control module does not directly determine that a fire has occurred at the location of the sampling tube. Instead, it continues to monitor the trends of actual temperature change, actual concentration change, and actual concentration change of a specific gas within a set time period to see if they meet a first set condition. If the first set condition is met, and at least one of the following occurs within the set time period: the maximum actual temperature of the gas exceeds a temperature alarm threshold, the maximum actual concentration of pyrolysis particles exceeds a pyrolysis particle concentration alarm threshold, or the maximum actual concentration of a specific gas exceeds a specific gas concentration alarm threshold, then a fire is determined to have occurred at the location of at least one sampling tube. In summary, the multi-channel measurement-type pyrolysis particle fire detector provided in this embodiment can simultaneously perform early fire detection in multiple different areas, locate and detect abnormal areas, and improve the high false alarm rate of existing fire detectors, thus increasing the accuracy of fire detection.

[0066] Optionally, the first setting condition is that, within a set time period, the actual temperature shows an increasing trend, the actual concentration of pyrolysis particles shows an increasing trend, and the actual concentration of a specific gas shows an increasing trend.

[0067] Specifically, when a fire occurs at the location of the sampling tube, the temperature at the fire scene will rise, and the amount of pyrolysis particles and specific gases released at the fire scene will increase. This will increase the actual temperature of the gas entering the sampling tube, as well as the concentration of pyrolysis particles and specific gases entering the sampling tube. The first set condition set in this embodiment matches the phenomena observed when a fire occurs. Therefore, using the control module's detection of the changing trends of the actual gas temperature, actual pyrolysis particle concentration, and actual gas concentration within a set time period, satisfying the first set condition, as one of the criteria for determining that a fire has occurred at the location of the sampling tube, can improve the accuracy of determining the occurrence of a fire.

[0068] Optionally, the control module is also used to determine that a fire has occurred at the location of at least one sampling tube when the actual concentration of pyrolysis particles is detected to be greater than or equal to the set pyrolysis particle concentration, and the trends of the actual temperature change, the actual concentration change, and the actual concentration change of the gas within the set time period do not meet the first set condition.

[0069] Specifically, the fact that the actual temperature change trend of the gas, the actual concentration change trend of pyrolysis particles, and the actual concentration change trend of a specific gas do not meet the first set condition means that at least one of the following does not show an increasing trend: the actual temperature change trend of the gas in the gas detection chamber, the actual concentration change trend of pyrolysis particles, and the actual concentration change trend of a specific gas within the set time period.

[0070] When the control module detects that the actual concentration of pyrolysis particles is greater than or equal to the set pyrolysis particle concentration, and that the actual temperature change trend, the actual concentration change trend of pyrolysis particles, and the actual concentration change trend of a specific gas within a set time period do not meet the first set condition, it is still impossible to directly determine whether a fire has occurred at the location of the sampling tube. At this time, in order to further improve the accuracy of fire detection and reduce the occurrence of fire false alarms, the control module continues to detect whether the actual concentration of pyrolysis particles is greater than or equal to the pyrolysis particle concentration alarm threshold. If the actual concentration of pyrolysis particles is detected to be greater than or equal to the pyrolysis particle concentration alarm threshold, it can be determined that a fire has occurred at the location of at least one sampling tube. It can be seen that this embodiment can determine whether a fire has occurred at the location of the sampling tube based on multiple situations at the location of the sampling tube, which can improve the problem of multiple false alarms in existing fire detectors.

[0071] Optionally, the control module is also used to determine that a fire has occurred at the location of at least one sampling tube when the actual concentration of pyrolysis particles is greater than or equal to the set pyrolysis particle concentration, the change trend of the actual temperature of the gas, the change trend of the actual concentration of pyrolysis particles, and the change trend of the actual concentration of a specific gas within the set time period do not meet the first set condition, and the actual concentration of pyrolysis particles is less than the pyrolysis particle concentration alarm threshold.

[0072] The first factor is determined according to the following formula:

[0073] δ1=F C1 / F C0 Where δ1 is the first factor, F C1 F represents the actual concentration of pyrolysis particles. C0 This is the alarm threshold for pyrolysis particle concentration.

[0074] The second factor is determined according to the following formula:

[0075] δ2=(1-λ)F v1 / F v0 , λ=F C0 / F, where δ2 is the second factor, λ is the pyrolysis particle early warning factor, and F is the set detector alarm threshold. v1 For the actual concentration of a specific gas, F v0 This refers to the alarm threshold for a specific gas concentration.

[0076] The third factor is determined according to the following formula:

[0077] δ3=(1-λ)(F T1 -F TA ) / (F T0 -F TA ), where δ3 is the third factor, F T1 F represents the actual gas temperature. T0 F is the temperature alarm threshold. TA This refers to the actual gas temperature detected by the gas detection module at the initial stage of detection.

[0078] Specifically, the value of λ ranges from 0.6 to 1.0. Initial detection refers to the actual gas temperature detected by the gas detection module after the sampling tube is placed in the sampling area and all gas sampling components corresponding to the actual sampling tube are turned on.

[0079] When the control module detects that the actual concentration of pyrolysis particles is greater than or equal to the set pyrolysis particle concentration, and that the trends of the actual temperature change, the actual concentration change, and the actual concentration change of the specific gas within the set time period do not meet the first set condition, and that the actual concentration of pyrolysis particles is less than the pyrolysis particle concentration alarm threshold, it is still impossible to directly determine whether a fire has occurred at the location of the sampling tube. At this time, in order to further improve the accuracy of fire detection and reduce the occurrence of fire false alarms, the control module continues to detect whether δ1 is greater than λ and whether the sum of δ1+δ2+δ3 is greater than or equal to 1. If it detects that δ1>λ and δ1+δ2+δ3≥1, it is determined that a fire has occurred at the location of at least one sampling tube. It can be seen that this embodiment can determine whether a fire has occurred at the location of the sampling tube based on multiple situations at the location of the sampling tube, which can further improve the problem of multiple false alarms in existing fire detectors.

[0080] Optional, Figure 2 This is a schematic diagram of the structure of another multi-channel measurement-type pyrolysis particle fire detector according to an embodiment of the present invention, with reference to... Figure 2The fire detector provided in this embodiment also includes a display module 160; the control module 140 is electrically connected to the display module 160. The control module 140 is used to control the display module 160 to display the actual temperature of the gas in the gas detection chamber 130, the actual concentration of pyrolysis particles and the actual concentration of a specific gas. It is also used to control the display module 160 to display a fire alarm signal when a fire is determined to occur at the location of at least one sampling tube 110.

[0081] Specifically, the display module 160 may include a display panel and LED lights. The gas detection module 150 can detect the actual temperature of the gas in the gas detection chamber 130, the actual concentration of pyrolysis particles, and the actual concentration of a specific gas at set intervals. The control module 140 can control the display module 160 to display the actual temperature of the gas detected by the gas detection module 150, the actual concentration of pyrolysis particles, and the actual concentration of the specific gas, so that users can understand the location of the sampling tube 110 based on the information displayed on the display module 160. The display module 160 can display a fire alarm signal by flashing light from the LED lights in the display module 160. When personnel see the flashing light from the LED lights in the display module 160, they can confirm that a fire has occurred at the location of the sampling tube 110.

[0082] Optional, Figure 3 This is a schematic diagram of the structure of another multi-channel measurement-type pyrolysis particle fire detector provided according to an embodiment of the present invention. Figure 4 This is a schematic diagram of the structure of another multi-channel measurement-type pyrolysis particle fire detector according to an embodiment of the present invention, with reference to... Figure 3 and Figure 4 The fire detector provided in this embodiment also includes a wind cavity 170, a fan 171, and an anemometer 172 located in the wind cavity 170; each gas sampling component 120 is connected to the wind cavity 170, the wind cavity 170 is connected to the fan 171, and the fan 171 is connected to the gas detection chamber 130; the fan 171 is used to bring the gas collected by the gas sampling component 120 into the gas detection chamber 130; the anemometer 172 is used to detect the actual wind speed in the wind cavity 170; the control module 140 is electrically connected to the anemometer 172, and the control module 140 is used to determine that the fire detector is faulty when the actual wind speed is less than the set wind speed.

[0083] Specifically, the control module 140 can be electrically connected to the fan 171, and the control module 140 can control the working state of the fan 171. At the beginning of the detection, the control module 140 controls all the gas sampling components 120 corresponding to the sampling tube 110 to be turned on, and controls the fan 171 to start. After the fan 171 starts, the gas at the location of the sampling tube 110 can quickly enter the sampling tube 110, and enter the air cavity 170 through the gas sampling components 120, and then enter the gas detection chamber 130 through the air cavity 170 and the fan 171. The fire detector provided in this embodiment also includes an exhaust end 131, from which the gas in the gas detection chamber 130 can be discharged.

[0084] In this embodiment, a fan 171 is installed in the fire detector, which enables the fire detector to have an active air intake function. This allows the gas to quickly enter the gas detection chamber 130, thereby enabling the gas detection module 150 to quickly detect the actual temperature of the gas, the actual concentration of pyrolysis ions, and the actual concentration of specific gases. This shortens the fire detection time and improves the fire detection sensitivity.

[0085] The control module 140 can obtain the actual wind speed from the anemometer 172 and compare the actual wind speed with the set wind speed. When the fan 171 starts, if the control module 140 detects that the actual wind speed is less than the set wind speed, it indicates that at least part of the passage from the sampling tube 110 to the air cavity 170 is blocked. At this time, the control module 140 can determine that the fire detector is faulty. After detecting the fire detector fault, the control module 140 can control the alarm module to issue a second alarm prompt to remind the staff to check the faulty fire detector in time.

[0086] Continue to refer to Figure 3 The fire detector provided in this embodiment also includes a power supply terminal 141 and an I / O terminal 142. The power supply terminal 141 is electrically connected to the control module 140. After the power supply terminal 141 is electrically connected to the power module, the power module can supply power to the control module 140. The I / O terminal 142 is electrically connected to the control module 140. The control module 140 can send information to the host computer through the I / O terminal 142, and can also receive information sent by the host computer through the I / O terminal 142.

[0087] Optional, continue to refer to Figure 3 and Figure 4The fire detector also includes a housing 180; the gas sampling assembly 120 includes an air inlet port 121, an air inlet pipe 122, and a control valve 123; the air inlet port 121 of each gas sampling assembly 120 is disposed on the housing 180, and the air inlet pipe 122 and control valve 123 of each gas sampling assembly 120 are located inside the housing 180; the first end of the air inlet port 121 is detachably connected to the sampling pipe 110, and the second end of the air inlet port 121 is connected to the first end of the air inlet pipe 122; the second end of the air inlet pipe 122 is connected to the control valve 123; the control valve 123 of each gas sampling assembly 120 is connected to the air cavity 170, and the control valve 123 is used to control the flow rate of gas in the air inlet pipe 122 into the air cavity 170.

[0088] Specifically, the gas entering the sampling tube 110 enters the air inlet pipe 122 through the air inlet port 121. The control valve 123 can control whether the gas in the air inlet pipe 122 flows into or does not flow into the air chamber 170. The control valve 123 can also control the amount of gas in the air inlet pipe 122 flowing into the air chamber 170.

[0089] The control module 140 is connected to the control valves 123 of each gas sampling component 120, and the control module 140 can control the opening degree of each control valve 123.

[0090] Figure 5 This is a schematic diagram of the housing of a multi-channel measurement-type pyrolysis particle fire detector according to an embodiment of the present invention. (Refer to...) Figure 5 The housing 180 includes an operation indicator light 181, a fault indicator light 182, a fire alarm light 183, a setting module 190, and multiple air inlet ports. When the fire detector is operating normally and no fire is detected at the location of at least one sampling tube, the operation indicator light 181 on the housing 180 will illuminate. When the fire detector malfunctions, the fault indicator light 182 on the housing 180 will illuminate. When the fire detector detects a fire at the location of at least one sampling tube, the fire alarm light 183 on the housing 180 will illuminate. The setting module 190 can be a button or a display screen. The setting module 190 can receive user input information, which can include the duration of a set time period, a temperature alarm threshold, a pyrolysis particle concentration alarm threshold, and a specific gas concentration alarm threshold.

[0091] Optional, Figure 6 This is an exploded view of a control valve according to an embodiment of the present invention, with reference to... Figure 6The control valve 123 provided in this embodiment includes a valve body 10, a motor 20, a valve core 30, a first sealing ring 40, and a second sealing ring 50. The valve body 10 includes a receiving cavity 11 and an air inlet cavity 12. The receiving cavity 11 and the air inlet cavity 12 are interconnected. The valve core 30 is disposed in the receiving cavity 11. A through hole 31 is provided at the center of the valve core 30. The first sealing ring 40 and the second sealing ring 50 are both placed on the outer surface of the valve core 30. The first sealing ring 40 and the second sealing ring 50 are used to fill the gap between the valve core 30 and the receiving cavity 11. A rotating hole is provided at the upper end of the valve core 30. The rotating hole is connected to the rotating shaft of the motor 20 located on the upper surface of the valve body 10. The motor 20 is used to rotate after being energized and drive the corresponding valve core 30 to rotate.

[0092] Specifically, the first sealing ring 40 is located on the upper side of the outer surface of the valve core 30, and the second sealing ring 50 is located on the lower side of the outer surface of the valve core 30. The motor 20 of each control valve 123 can be electrically connected to the control module. The control module can control the rotation of the motor 20. When the motor 20 rotates, it drives the valve core 30 to rotate. During the rotation of the valve core 30, the through hole 31 of the valve core 30 will connect with the air inlet cavity 12, thus forming an air inlet passage. This air inlet passage allows gas from the sampling tube to enter the gas detection chamber through the control valve. During the rotation of the valve core 30, the through hole 31 of the valve core 30 will also not connect with the air inlet cavity 12. At this time, gas from the sampling tube cannot enter the gas detection chamber through the control valve 123. The control valve 123 provided in this embodiment has a simple structure and can control the gas flow rate entering the gas detection chamber.

[0093] Optionally, a filter is provided at the inner cross-section of the intake pipe; the filter is used to filter interfering substances in the gas entering the intake pipe.

[0094] Specifically, interfering substances can be dust, water vapor, etc. By installing a filter at the cross-section of the air intake pipe, the purity of the gas entering the gas detection chamber through the air intake pipe can be increased, which can improve the accuracy of the gas detection module, thereby improving the sensitivity and accuracy of fire detection. It can also prevent the air cavity and gas detection chamber from being blocked by too many interfering substances.

[0095] This embodiment also provides a multi-channel measurement-type pyrolysis particle fire detection method, which can be applied to the multi-channel measurement-type pyrolysis particle fire detector provided in any embodiment of the present invention.

[0096] Figure 7 This is a flowchart illustrating a multi-channel measurement-based pyrolysis particle fire detection method according to an embodiment of the present invention. (Refer to...) Figure 7 The fire detection method includes the following steps:

[0097] S110, detects the actual temperature of the gas in the gas detection chamber, the actual concentration of pyrolysis particles, and the concentration of a specific gas.

[0098] S120. Detect whether the actual concentration of pyrolysis particles is greater than or equal to the set concentration of pyrolysis particles.

[0099] If yes, then execute S130. If no, then execute S160.

[0100] S130. Detect whether the actual temperature change trend of the gas, the actual concentration change trend of pyrolysis particles, and the actual concentration change trend of a specific gas within a set time period meet the first set condition.

[0101] If yes, then execute S140. If no, then execute S160.

[0102] S140. Determine whether, within a set time period, at least one of the following is detected: the maximum value of the actual gas temperature is greater than the temperature alarm threshold, the maximum value of the actual pyrolysis particle concentration is greater than the pyrolysis particle concentration alarm threshold, and the maximum value of the actual concentration of a specific gas is greater than the specific gas concentration alarm threshold.

[0103] If yes, then execute S150. If no, then execute S160.

[0104] S150. Determine that a fire has occurred at the location of at least one sampling tube.

[0105] S160. The fire detector continues to detect whether a fire has occurred at the location of at least one sampling tube.

[0106] To further understand the multi-channel measurement-based pyrolysis particle fire detection method provided in this embodiment, this embodiment provides a more detailed description of the fire detection method. Figure 8 This is yet another multi-channel measurement-based pyrolysis particle fire detection method provided by an embodiment of the present invention, referenced. Figure 8 ,

[0107] The fire detection method includes the following steps:

[0108] S210, Set the alarm threshold F for the detector.

[0109] Specifically, users can set the detector alarm threshold F according to their actual needs.

[0110] S220, Control the gas sampling component corresponding to the sampling tube used to be turned on, and obtain the actual concentration F of pyrolysis particles. C1 .

[0111] S230, Detection F C1 Is it less than F / N?

[0112] Specifically, F / N represents the set pyrolysis particle concentration.

[0113] If not, proceed to step S240; if yes, proceed to step S320.

[0114] S240, Set temperature alarm threshold F T0 Specific gas concentration alarm threshold F v0 Pyrolysis particle concentration alarm threshold F C0 And the pyrolysis particle early warning factor λ.

[0115] S250, Obtain the actual gas temperature F T1 , Actual concentration of a specific gas F v1 Actual concentration F of pyrolysis particles C1 And the actual gas temperature F detected in the initial stage of the test. TA .

[0116] S260, Detect F within the set time period T1 Trend of change, F v1 The changing trend and F C1 Does the trend of change show an increasing trend?

[0117] If yes, proceed to step S270. If no, proceed to step S280.

[0118] S270. Determine whether F exists within the set time period. T1 ≥F T0 F v1 ≥F v0 and F C1 ≥F C0 At least one of these three.

[0119] If yes, proceed to step S310. If no, proceed to step S320.

[0120] S280, Determine F C1 Is it greater than or equal to F? C0 .

[0121] If yes, proceed to step S310. If no, proceed to step S290.

[0122] S290. Determine whether δ1 is greater than or equal to λ.

[0123] If yes, proceed to step S300. If no, proceed to step S320.

[0124] S300, Determine whether δ1+δ2+δ3 is greater than or equal to 1.

[0125] If yes, proceed to step S310. If no, proceed to step S320.

[0126] S310. Determine that a fire has occurred at the location of at least one sampling tube.

[0127] S320. The fire detector continues to detect whether a fire has occurred at the location of at least one sampling tube.

[0128] The multi-channel measurement-type pyrolysis particle fire detection method provided in this embodiment has the same beneficial effects as the multi-channel measurement-type pyrolysis particle fire detector provided in any embodiment of the present invention. For technical details not detailed in this embodiment, please refer to the multi-channel measurement-type pyrolysis particle fire detector provided in any embodiment of the present invention.

[0129] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0130] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A multi-channel measurement-type pyrolysis particle fire detector, characterized in that, include: Multiple sampling tubes, multiple gas sampling components, a gas detection chamber, a control module, and a gas detection module disposed within the gas detection chamber; The gas sampling component corresponds to the sampling tube and is detachably connected. The gas sampling component is used to collect the gas at the location of its corresponding sampling tube when it is turned on. Each of the gas sampling components is connected to the gas detection chamber, which is used to contain the gas collected by each of the gas sampling components; The gas detection module is used to detect the actual temperature of the gas, the actual concentration of pyrolysis particles, and the concentration of a specific gas in the gas detection chamber. The control module is electrically connected to the gas detection module. The control module is used to detect, after detecting that the actual concentration of the pyrolysis particles is greater than or equal to the set pyrolysis particle concentration, the change trend of the actual temperature of the gas, the change trend of the actual concentration of the pyrolysis particles, and the change trend of the actual concentration of a specific gas within a set time period meet the first set condition, and when the maximum value of the actual temperature of the gas detected within the set time period is greater than the temperature alarm threshold, the maximum value of the actual concentration of the pyrolysis particles is greater than the pyrolysis particle concentration alarm threshold, and the maximum value of the actual concentration of the specific gas is greater than the specific gas concentration alarm threshold, determine that a fire has occurred at the location of at least one of the sampling tubes. The control module is further configured to determine that a fire has occurred at the location of at least one sampling tube when the following conditions are met: the actual concentration of the pyrolysis particles is greater than or equal to the set pyrolysis particle concentration; the change trend of the actual temperature of the gas, the change trend of the actual concentration of the pyrolysis particles, and the change trend of the actual concentration of a specific gas during the set time period do not meet the first set condition; and the actual concentration of the pyrolysis particles is less than the pyrolysis particle concentration alarm threshold. The first factor is determined according to the following formula: δ1=F C1 / F C0 Where δ1 is the first factor, F C1 F represents the actual concentration of pyrolysis particles. C0 The pyrolysis particle concentration alarm threshold is defined as follows; The second factor is determined according to the following formula: δ2=(1-λ)F v1 / F v0 , λ=F C0 / F, where δ2 is the second factor, λ is the pyrolysis particle early warning factor, and F is the set detector alarm threshold. v1 For the actual concentration of a specific gas, F v0 For specific gas concentration alarm thresholds; The third factor is determined according to the following formula: δ3=(1-λ)(F T1 -F TA ) / (F T0 -F TA ), where δ3 is the third factor, F T1 F represents the actual gas temperature. T0 F is the temperature alarm threshold. TA The actual gas temperature detected by the gas detection module at the initial stage of detection.

2. The multi-channel measurement-type pyrolysis particle fire detector according to claim 1, characterized in that, The first set condition is that, within the set time period, the actual temperature shows an increasing trend, the actual concentration of pyrolysis particles shows an increasing trend, and the actual concentration of the specific gas shows an increasing trend.

3. The multi-channel measurement-type pyrolysis particle fire detector according to claim 1, characterized in that, The control module is further configured to determine that a fire has occurred at the location of at least one of the sampling tubes when it detects that the actual concentration of the pyrolysis particles is greater than or equal to the set pyrolysis particle concentration, and the actual temperature change trend, the actual concentration change trend of the pyrolysis particles, and the actual concentration change trend of the specific gas within the set time period do not meet the first set condition.

4. The multi-channel measurement-type pyrolysis particle fire detector according to claim 1, characterized in that, It also includes a display module; The control module is electrically connected to the display module. The control module is used to control the display module to display the actual temperature of the gas in the gas detection chamber, the actual concentration of pyrolysis particles, and the actual concentration of a specific gas. It is also used to control the display module to display a fire alarm signal when a fire is determined to occur at the location of at least one of the sampling tubes.

5. The multi-channel measurement-type pyrolysis particle fire detector according to any one of claims 1-4, characterized in that, It also includes a wind cavity, a fan, and an anemometer located within the wind cavity; Each of the gas sampling components is connected to the air cavity, the air cavity is connected to the blower, and the blower is connected to the gas detection chamber; The fan is used to carry the gas collected by the gas collection component into the gas detection chamber; The anemometer is used to detect the actual wind speed inside the air cavity; The control module is electrically connected to the anemometer, and the control module is used to determine that the fire detector is faulty when the actual wind speed is less than the set wind speed.

6. The multi-channel measurement-type pyrolysis particle fire detector according to claim 5, characterized in that, The fire detector also includes a housing; The gas sampling assembly includes an air inlet port, an air inlet pipe, and a control valve; The air inlet port of each gas sampling component is located on the housing, and the air inlet pipe and control valve of each gas sampling component are located inside the housing; The first end of the air inlet port is detachably connected to the sampling tube, and the second end of the air inlet port is connected to the first end of the air inlet pipe; The second end of the air intake pipe is connected to the control valve; The control valve of each gas sampling component is connected to the air cavity, and the control valve is used to control the flow rate of gas in the air inlet pipe into the air cavity.

7. The multi-channel measurement-type pyrolysis particle fire detector according to claim 6, characterized in that, The control valve includes a valve body, a motor, a valve core, a first sealing ring, and a second sealing ring. The valve body includes a receiving cavity and an air inlet cavity; the receiving cavity and the air inlet cavity are interconnected. The valve core is disposed within the receiving cavity; the valve core has a through hole at its center. Both the first sealing ring and the second sealing ring are placed on the outer surface of the valve core, and the first sealing ring and the second sealing ring are used to fill the gap between the valve core and the accommodating cavity; The upper end of the valve core is provided with a rotating hole, which is connected to the rotating shaft of the motor located on the upper surface of the valve body. The motor is used to rotate after being powered on, thereby driving the corresponding valve core to rotate.

8. The multi-channel measurement-type pyrolysis particle fire detector according to claim 6, characterized in that, A filter is provided at the inner cross-section of the air intake pipe; The filter is used to filter out interfering substances from the gas entering the intake pipe.

9. A multi-channel measurement-based method for detecting pyrolysis particle fires, characterized in that, Applied to the multi-channel measurement-type pyrolysis particle fire detector according to any one of claims 1-8; The fire detection method includes: The actual temperature of the gas, the actual concentration of pyrolysis particles, and the concentration of a specific gas are detected within the gas detection chamber. Detect whether the actual concentration of the pyrolysis particles is greater than or equal to the set concentration of pyrolysis particles; If so, then check whether the actual temperature change trend of the gas, the actual concentration change trend of pyrolysis particles, and the actual concentration change trend of a specific gas within the set time period meet the first set condition. If so, determine whether at least one of the following is detected within the set time period: the maximum value of the actual temperature of the gas is greater than the temperature alarm threshold, the maximum value of the actual concentration of pyrolysis particles is greater than the pyrolysis particle concentration alarm threshold, and the maximum value of the actual concentration of the specific gas is greater than the specific gas concentration alarm threshold. If so, then it is determined that a fire occurred at least at the location of the sampling tube.

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