Primary and secondary channel airflow guiding device for detecting particulate matters of detection part of fire monitor fire extinguishing system
By designing the primary and secondary channel airflow guidance device in the aspirated pyrotechnic detection system, the problems of weakening suction force of the sampling tube and blockage of the filter are solved, and the smooth flow and high sensitivity detection of the air sample are realized, and timely monitoring and Alarm to prevent fire detection from failing.
Patent Information
- Application Number
- CN202411525650.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-30
- Publication Date
- 2024-12-31
AI Technical Summary
In the existing aspirated pyrotechnic detection system, all the air samples extracted from the sampling tube are suctioned and sent to the filter assembly and laser detection chamber, resulting in large air flow resistance, affecting the sampling accuracy, and the filter is prone to clogging, affecting the The system is running stably, and if the sampling tube is blocked or the fan is malfunctioning, the smoke particles cannot enter the detection device, resulting in fire detection failure.
Design a fire gun fire extinguishing system to detect part of the primary and secondary airflow guidance device for detection of particulate matter. By setting up a shunt plate in the shell to form a shunt channel, some air samples enter the detection chamber for filtering and testing, and most air samples are directly discharged to avoid The sampling suction force is weakened, and negative pressure is generated through the return pipe to ensure that the air sample enters the detection chamber at high speed. A speed measuring sensor is set to monitor whether the air flow is normal and promptly alarm to troubleshoot the fault.
It realizes smooth flow of air samples, avoids filter blockage and weakens the suction force of the sampling tube, improves the sensitivity and stable operation of the detection device, monitors and alarms in a timely manner, and prevents fire detection failure.
Smart Images
Figure CN119229587A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of firefighting, and in particular to a primary and secondary channel airflow guide device for detecting particulate matter in a fire cannon fire extinguishing system. Background Art
[0002] The aspirating smoke fire detector is a highly sensitive fire detection device that can actively collect air samples and analyze the smoke concentration in them to achieve early fire detection. The system is widely used in places such as data centers, museums, warehouses, etc. that have high requirements for early fire detection. The invention patent with application number CN2009102288597 discloses an aspirating dual-detection smoke fire detection system and its alarm method. The principle of the patent is: the suction fan simultaneously extracts air as a sample from different protected areas through a multi-channel sampling tube made of PVC or steel. The air sample flows into the filter assembly through the air duct joint and the fan box to filter out dust particles, and then is sent to the laser detection room to detect whether there are smoke particles in the sampled air, thereby determining the area where the fire occurs. The problems that exist in the use of this type of smoke fire detection system are: first, all the air samples drawn by the sampling tube are sucked into the filter assembly and the laser detection chamber. The filtration and detection will produce greater resistance to the air flow, which will then act on the sampling tube to weaken its sampling suction force, which is not conducive to ensuring sufficient suction sampling in the protection area and affects the detection accuracy. In addition, the concentrated filtration and dust removal of a large number of air samples can easily cause the filter assembly to be blocked in a short time, requiring frequent disassembly for inspection and maintenance, which is not conducive to the continuous and stable operation of the detection system; second, the sampling tube covers a large area of the protection area as a whole. If the sampling tube is blocked somewhere or the extraction fan fails, the smoke particles cannot enter the detection device, resulting in the failure of the detection device to detect fire hazards in advance. If the fault is not eliminated in time, there will be endless troubles. Summary of the invention
[0003] In order to solve the above problems, the present invention proposes a primary and secondary channel airflow guide device for detecting particulate matter in a fire cannon fire extinguishing system.
[0004] The technical solution of the present invention is: a primary and secondary channel airflow guide device for particle detection in the detection part of a fire cannon fire extinguishing system, comprising a shell, a particle detector and a filter. The shell is square as a whole, and a sealing cover is provided at the upper port of the shell. The sealing cover is fixedly connected to the shell by screws, and convex ribs are provided on the bottom surface of the sealing cover. A card slot is formed between the convex ribs, and the card slot is matched and clamped on the upper port of the shell to improve the sealing effect. A longitudinal partition is provided between the two end plates of the shell, and the longitudinal partition divides the interior of the shell into a detection chamber and an airflow chamber. The interior of the airflow chamber is divided into a main channel and a diversion channel in proportion by setting a diversion plate. An air inlet is provided at one end of the main channel, and an air outlet is provided at the other end. The exhaust hole and the air inlet are arranged relatively to each other. An air inlet is provided at the detection chamber at the inner end of the diversion channel, and the air inlet is an oblong hole arranged along the width direction of the longitudinal partition. An air outlet is provided at the other end of the detection chamber. A speed measuring port is provided on the end plate corresponding to the diversion channel, and an airflow sensor is installed in the middle of the speed measuring port through a bracket.
[0005] Preferably, a diversion inlet is provided between one end of the diverter plate and the end plate A of the shell, and the other end is vertically connected to the end plate B of the shell. The length of the diverter plate is greater than half of the length of the longitudinal partition, and a guide corner is provided on the end face of the diverter plate.
[0006] Preferably, a connecting pipe connected to the air inlet is provided on the outer side of the end plate armor of the shell, and the shell is connected to the sampling tube through the connecting pipe. A fan is installed at the air inlet, and a return pipe is connected to the air outlet. The suction fan is fixed to the inner side of the end plate armor by screws, and the outer end of the return pipe is connected to the middle part of the connecting pipe, and the return pipe is connected to the connecting pipe radially.
[0007] Preferably, the reflux pipe is an L-shaped pipe, the L-shaped pipe and the joint pipe are integrally formed, and reinforcing ribs are provided on the L-shaped pipe and the joint pipe to ensure the integral strength between the two.
[0008] Preferably, a docking plate is integrally provided between the inner ports of the connecting pipe and the return pipe, and the four corners of the docking plate are fixedly connected to the end plate armor by screws. The size of the docking plate is substantially the same as that of the end plate armor, and a large circular hole corresponding to the connecting pipe is provided in the middle of the connecting plate, and the large circular hole is coaxial with the connecting pipe, and a small circular hole corresponding to the return pipe is provided on one side of the docking plate.
[0009] Preferably, the filter is installed in the detection cavity and covers the air inlet, the particle detector is installed between the filter and the air outlet, the filter is close to the end plate B, and the particle detector is close to the end plate A.
[0010] Preferably, a transverse partition is provided on the upper portion of the detection chamber, a certain distance is provided between the transverse partition and the bottom plate of the shell, and the particle detector and the filter are fixed between the transverse partition.
[0011] The beneficial technical effects of the present invention are: (1) The device forms a diversion channel on one side of the main channel by arranging a diversion plate in the shell. Part of the drawn air sample will enter the detection chamber from the diversion channel for large-particle dust filtration and particulate matter detection, and most of it will be directly discharged from the exhaust hole. The air sample can be detected normally while ensuring its smooth flow, avoiding the phenomenon that the sampling suction force at the sampling tube is weakened and the protection area cannot be fully sampled. At the same time, it can also effectively reduce the air flow at the filter to avoid it being blocked for a short time, without frequent disassembly and maintenance, which is conducive to the continuous and stable operation of the detection device.
[0012] (2) The negative pressure generated by the fan suction at the joint pipe of the device can act on the detection chamber through the return pipe, so that negative pressure will also be generated in the detection chamber to produce suction force on the air sample being detected, so that the air sample can smoothly and quickly enter the detection chamber from the diversion channel for filtration and detection, which is beneficial to improve the sensitivity of the detection device and ensure the detection and monitoring effect.
[0013] (3) The device's diversion channel guides a portion of the air sample that enters to be discharged from the velocity measurement port. The internal velocity sensor detects whether there is airflow passing through. If a malfunction causes the air sample to fail to enter the detection device normally, the velocity sensor can detect it and send out an alarm signal, thereby eliminating the fault in a timely manner and avoiding fire hazards caused by fire detection failure. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is one of the three-dimensional structural schematic diagrams of the present invention; Figure 2 yes Figure 1 AA section structural diagram; Figure 3 yes Figure 2 BB-direction cross-sectional structural diagram; Figure 4 is a schematic diagram of the three-dimensional structure of the present invention after removing the sealing cover; Figure 5 This is the second schematic diagram of the three-dimensional structure of the present invention; Figure 6 It is a three-dimensional structural schematic diagram of the joint pipe; Figure 7 It is a schematic diagram of the three-dimensional structure of the present invention after removing the sealing cover and the joint pipe; Figure 8 and Fig. 9 It is a product diagram of the present invention.
[0015] In the figure, 1. shell, 11. sealing cover, 12. end plate A, 121. air inlet, 13. end plate B, 131. exhaust hole, 14. longitudinal partition, 141. air inlet, 15. diverter plate, 151. diverter channel, 16. air outlet, 17. detection chamber, 18. main channel, 19. transverse partition, 2. joint pipe, 21. return pipe, 22. docking plate, 221. large circular hole, 222. small circular hole, 23 conical expansion section, 3. suction fan, 4. particle detector, 5. filter, 6. speed measuring port, 61. air flow sensor, 62. wire, 63. bracket. DETAILED DESCRIPTION
[0016] Embodiment 1, see attached Figure 1-5 7. A primary and secondary channel airflow guide device for particle detection in the detection part of a fire cannon fire extinguishing system, comprising a shell, a particle detector and a filter. A longitudinal partition is provided between the two end plates of the shell, and the longitudinal partition divides the interior of the shell into a detection chamber and an airflow chamber. The interior of the airflow chamber is divided into a main channel and a diversion channel in proportion by arranging a diversion plate. The diversion plate and the longitudinal partition are arranged parallel to each other. An air inlet is provided at one end of the main channel, and the air inlet is connected to a suction pipe. The air sample extracted by the suction pipe enters the shell from the air inlet. Most of the air sample is discharged from the main channel, and a small part enters the diversion channel. An air outlet is provided at the other end. An air inlet is provided at the detection chamber at the inner end of the diversion channel. The air sample enters the detection chamber from the air inlet of the diversion channel. An air outlet is provided at the other end of the detection chamber. A speed measuring port is provided on the end plate corresponding to the diversion channel. An airflow sensor is installed in the middle of the speed measuring port through a bracket. A wiring port is provided at the upper end of the speed measuring port. The wire of the sensor is introduced from the wiring port and connected to the airflow sensor.
[0017] A diversion inlet is provided between one end of the diversion plate and the end plate A of the shell, and the other end is vertically connected to the end plate B of the shell. The length of the diversion plate is greater than half of the length of the longitudinal partition. There is a suitable distance between the inlet of the diversion channel and the suction fan to ensure that part of the air sample enters the diversion channel smoothly in proportion.
[0018] The filter is installed in the detection cavity and covers the air inlet. The particle detector is installed between the filter and the air outlet. The filter is used to filter out large particles of dust in the air sample to prevent large particles of dust from affecting the detection accuracy of the particle detector. A transverse partition is provided on the upper part of the detection cavity. The particle detector and the filter are fixed between the transverse partitions to improve the assembly stability of the particle detector and the filter in the detection cavity.
[0019] The principle of the detection device of this embodiment is: the suction force of the suction fan acts on the sampling tube from the joint pipe, the sampling tube continuously extracts the air in the detection protection area, and sucks the air sample from the air inlet into the main channel of the shell, and most of the air samples will be discharged from the exhaust hole at the end of the main channel. Under the action of the diverter plate, part of the air sample is proportionally diverted and introduced into the diverter channel, and enters the detection chamber from the air inlet at the end of the diverter channel. The filter filters out large particles of dust in the air, and then enters the particle detector to detect whether there are smoke particles in the air sample, so as to realize fire monitoring. In this process, part of the air sample guided into the diverter channel is discharged from the speed measuring port, and the internal speed measuring sensor detects whether there is air flow passing through. If a fault occurs and causes the air sample to fail to enter the detection device normally, the speed measuring sensor can monitor it and send an alarm signal to eliminate the fault in time; the device ensures the normal detection of the air sample while ensuring its smooth flow, avoiding the phenomenon that the sampling suction force at the sampling tube is weakened and the protection area cannot be fully sampled, and can effectively avoid the filter from being blocked for a short time, which is conducive to the continuous and stable operation of the detection device, and can also avoid the phenomenon of fire hazards due to fire detection failure.
[0020] Embodiment 2, see attached Figure 1-3 6. This embodiment is basically the same as the first embodiment, and the similarities are not repeated here. The difference is that a joint pipe connected to the air inlet is provided on the outer side surface of the end plate armor of the shell, and a conical expansion section is provided at the inner end of the joint pipe to increase the suction area at the end of the joint pipe and enhance the sampling suction force of the joint pipe and the sampling tube. A suction fan is installed at the air inlet, and a return pipe is connected to the air outlet. The outer end of the return pipe is connected to the middle part of the joint pipe, and the return pipe is an L-shaped pipe, which is integrally formed with the joint pipe.
[0021] When the detection device of this embodiment is working, negative pressure will be generated at the joint pipe due to the fan suction, and the negative pressure will act on the detection chamber through the reflux pipe. The negative pressure in the detection chamber will generate suction force on the air sample to be detected, so that the air sample can smoothly and quickly enter the detection chamber from the diversion channel for filtration and detection, which is beneficial to improve the sensitivity of the detection device and ensure the detection and monitoring effect.
[0022] A docking plate is integrally provided between the inner ports of the joint pipe and the return pipe, and the joint pipe is fixedly connected to the end plate A through the docking plate. This integrated structure facilitates the disassembly, maintenance and assembly of the joint pipe and the return pipe. The docking plate is fixedly connected to the end plate A, and a large circular hole corresponding to the joint pipe is provided in the middle of the docking plate, and a small circular hole corresponding to the return pipe is provided on one side of the docking plate. Sealing gaskets are provided at both the large circular hole and the small circular hole to ensure the airtightness of the device.
Claims
1. A primary and secondary channel airflow guide device for particle detection in the detection part of a fire monitor fire extinguishing system, comprising a housing, a particle detector and a filter, characterized in that: A longitudinal partition is provided between the two end plates of the shell, which divides the interior of the shell into a detection chamber and an airflow chamber. The interior of the airflow chamber is divided into a main channel and a diversion channel in proportion by setting a diversion plate. An air inlet is provided at one end of the main channel, and an air outlet is provided at the other end. An air inlet is provided at the detection chamber at the inner end of the diversion channel, and an air outlet is provided at the other end of the detection chamber. A speed measuring port is provided on the end plate corresponding to the diversion channel, and an airflow sensor is installed in the middle of the speed measuring port through a bracket.
2. According to claim 1, the primary and secondary channel airflow guide device for particle detection in the detection part of the fire cannon fire extinguishing system is characterized by: A diversion inlet is provided between one end of the diverter plate and the end plate A of the shell, and the other end is vertically connected to the end plate B of the shell. The length of the diverter plate is greater than half of the length of the longitudinal partition plate.
3. The primary and secondary channel airflow guide device for particle detection in the detection part of a fire monitor fire extinguishing system according to claim 1 is characterized by: The outer side of the end plate armor of the shell is provided with a joint pipe connected to the air inlet, a suction fan is installed at the air inlet, a return pipe is connected to the air outlet, and the outer end of the return pipe is connected to the middle of the joint pipe.
4. The primary and secondary channel airflow guide device for particle detection in the detection part of a fire monitor fire extinguishing system according to claim 3 is characterized by: The reflux pipe is an L-shaped pipe, and the L-shaped pipe and the joint pipe are integrally formed.
5. The primary and secondary channel airflow guide device for particle detection in the detection part of a fire monitor fire extinguishing system according to claim 4 is characterized by: A docking plate is integrally provided between the inner ports of the joint pipe and the return pipe, the docking plate is fixedly connected to the end plate A, a large circular hole corresponding to the joint pipe is provided in the middle of the docking plate, and a small circular hole corresponding to the return pipe is provided on one side of the docking plate.
6. The primary and secondary channel airflow guide device for particle detection in the detection part of a fire monitor fire extinguishing system according to claim 1, characterized in that: The filter is installed in the detection cavity and covers the air inlet, and the particle detector is installed between the filter and the air outlet.
7. The primary and secondary channel airflow guide device for particle detection in the detection part of a fire monitor fire extinguishing system according to claim 1 is characterized by: A transverse partition is arranged on the upper part of the detection chamber, and the particle detector and the filter are fixed between the transverse partitions.