Gas particulate matter detection device for fire monitoring of fire monitor fire extinguishing system detection part

Abstract

A gas particulate matter detection device for a fire monitor fire extinguishing system detection part is characterized in that an end plate A at one end of a shell is provided with a gas inlet hole, a suction fan is mounted at the gas inlet hole, and an end plate B at the other end of the shell is provided with a gas outlet hole; a longitudinal partition plate is arranged in the shell, the particulate matter detector is installed in a detection cavity formed between the longitudinal partition plate and one side plate of the shell, an air outlet corresponding to the detection cavity in position is formed in the first end plate, an air inlet is formed in the longitudinal partition plate close to one end of the second end plate, and a splitter plate covering the air inlet is arranged on the second end plate on one side of the exhaust hole; part of an air sample extracted by the device enters the detection cavity from the shunting channel, and most of the air sample is discharged from the exhaust hole, so that smooth flow of the air sample can be ensured while the air sample is normally detected, the situation that a protection area cannot be fully sampled due to the fact that suction force at the sampling pipe is weakened is avoided, and air flow at the filter can be effectively reduced; short-time blockage is avoided, and continuous and stable operation of the detection device is facilitated.

Description

Technical Field

[0001] The invention relates to the field of fire protection, and in particular to a gas particle detection device used for fire monitoring in the detection part of 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 problem that exists in the use of this type of smoke fire detection system is that 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 a large 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. Summary of the invention

[0003] In order to solve the above problems, the present invention proposes a gas particle detection device for fire monitoring in the detection part of a fire cannon fire extinguishing system.

[0004] The technical solution of the present invention is: a gas particle detection device for fire monitoring 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 end 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 end 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.

[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 detection 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 detection 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 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional structural schematic diagram 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 It is a three-dimensional structural schematic diagram of the joint pipe; Figure 6 It is a schematic diagram of the three-dimensional structure of the present invention after removing the sealing cover and the joint pipe; 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. DETAILED DESCRIPTION

[0014] Embodiment 1, see attached Figure 1-6 A gas particle detection device for fire monitoring in the detection part of a fire cannon fire extinguishing system comprises a shell 1, a particle detector 4 and a filter 5. A longitudinal partition 14 is provided between the two end plates of the shell 1. The longitudinal partition divides the interior of the shell 1 into a detection chamber 17 and an airflow chamber. The interior of the airflow chamber is divided into a main channel 18 and a diversion channel 151 in proportion by setting a diversion plate 15. The diversion plate 15 and the longitudinal partition 14 are arranged parallel to each other. An air inlet 121 is provided at one end of the main channel 18. The air inlet is connected to a sampling tube. The air sample extracted by the sampling tube enters the main channel 18 through the air inlet. The air sample enters the shell, and most of the air sample is discharged from the main channel 18, and a small part enters the diverter channel 151. An air outlet is provided at the other end. An air inlet 141 is provided at the detection cavity 17 at the inner end of the diverter channel 151. The air sample enters the detection cavity 17 from the air inlet 141 of the diverter channel 151, and an air outlet 16 is provided at the other end of the detection cavity 17. A speed measuring port is provided on the end plate corresponding to the diverter channel 151, and an air flow 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, and the wire of the sensor is introduced from the wiring port to connect with the air flow sensor.

[0015] A diversion inlet is provided between one end of the diversion plate 15 and the end plate A 12 of the shell 1, and the other end is vertically connected to the end plate B 13 of the shell 1. The length of the diversion plate 15 is greater than half of the length of the longitudinal partition 14. There is a suitable distance between the inlet of the diversion channel 151 and the suction fan 3, ensuring that part of the air sample enters the diversion channel 151 smoothly in proportion.

[0016] The filter 5 is installed in the detection chamber 17 and covers the air inlet 141. The particle detector 4 is installed between the filter 5 and the air outlet 16. The filter 5 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 4. A transverse partition 19 is provided on the upper part of the detection chamber 17. The particle detector 4 and the filter 5 are fixed between the transverse partitions 19 to improve the assembly stability of the particle detector 4 and the filter 5 in the detection chamber 17.

[0017] The principle of the detection device of this embodiment is as follows: the suction force of the suction fan 3 acts on the sampling tube from the joint tube 2, and the sampling tube continuously extracts the air in the detection protection area, and sucks the air sample from the air inlet 121 into the main channel 18 of the shell 1. Most of the air samples will be discharged from the exhaust hole 131 at the end of the main channel 18. Under the action of the diverter plate 15, part of the air sample is proportionally diverted and introduced into the diverter channel 151, and enters the detection chamber 17 from the air inlet 141 at the end of the diverter channel 151. The filter 5 filters out large particles of dust in the air, and then enters the particle detector 4 to detect whether there are smoke particles in the air sample, so as to realize fire monitoring; the detection device can ensure the smooth flow of air samples while ensuring the normal detection of air samples, 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 5 to avoid its short-term blockage, and does not need to be frequently disassembled and maintained, which is conducive to the continuous and stable operation of the detection device.

[0018] Embodiment 2, see attached Figure 1-3 This embodiment is basically the same as the first embodiment, and the similarities are not repeated here. The difference is that the outer side surface of the end plate armor 12 of the shell 1 is provided with a joint pipe 2 connected to the air inlet hole 121, and the inner end of the joint pipe 2 is provided with a conical expansion section 23 to increase the suction area at the end of the joint pipe 2 and enhance the sampling suction force of the joint pipe 2 and the sampling tube. A suction fan 3 is installed at the air inlet hole 121, and a return pipe 21 is connected to the air outlet 16. The outer end of the return pipe 21 is connected to the middle part of the joint pipe 2, and the return pipe 21 is an L-shaped pipe, which is integrally formed with the joint pipe 2.

[0019] When the detection device of this embodiment is working, negative pressure will be generated at the joint pipe 2 due to the fan suction, and the negative pressure will act on the detection chamber 17 through the reflux pipe 21. The negative pressure generated in the detection chamber 17 will generate suction force on the air sample to be detected, so that the air sample can smoothly and quickly enter the detection chamber 17 from the diversion channel 151 for filtration and detection, which is beneficial to improve the sensitivity of the detection device and ensure the detection and monitoring effect.

[0020] A docking plate 22 is integrally provided between the inner ends of the connecting pipe 2 and the return pipe 21, and the connecting pipe is fixedly connected to the end plate A 12 through the docking plate. This integrated structure facilitates the disassembly, maintenance and assembly of the connecting pipe 2 and the return pipe 21. The docking plate 22 is fixedly connected to the end plate A 12, and a large circular hole 221 corresponding to the connecting pipe 2 is provided in the middle of the docking plate, and a small circular hole 222 corresponding to the return pipe 21 is provided on one side of the docking plate 22. 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 gas particle detection device for fire monitoring 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.

2. According to claim 1, a gas particle detection device for fire monitoring in the detection part of a fire monitor fire extinguishing system, characterized in that: 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. According to claim 1, the detection part of the fire monitor fire extinguishing system is used for the gas particle detection device for fire monitoring, characterized in that: 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 device for detecting particulate matter in gas used for fire monitoring in the detection part of a fire monitor fire extinguishing system according to claim 3 is characterized in that: The reflux pipe is an L-shaped pipe, and the L-shaped pipe and the joint pipe are integrally formed.

5. The device for detecting particulate matter in gas used for fire monitoring in the detection part of a fire monitor fire extinguishing system according to claim 4 is characterized in that: 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 device for detecting particulate matter in gas used for fire monitoring 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 device for detecting particulate matter in gas used for fire monitoring in the detection part of a fire monitor fire extinguishing system according to claim 1, characterized in that: 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.

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