Bidirectional single-channel smoke detector for fire monitor fire extinguishing system

Abstract

A two-way single-channel smoke detector for a fire monitor fire extinguishing system is characterized in that joint pipes are arranged at two ends of a shell of the two-way single-channel smoke detector, and an annular boss directly facing the joint pipes is arranged in the shell; two side channels are formed between the two sides of the annular boss and the two side plates of the shell, and gaps are formed between the two ends of the annular boss and the two end plates of the shell. The particulate matter sensor is installed in the annular boss, filters are installed at the two ends of the annular boss, and air holes are formed in the middles of the two end faces of the annular boss; a fan is mounted at the inner end of one joint pipe; the detector has the advantages of improving the smoothness of an air sample filtering detection process, reducing the resistance of the air sample, avoiding the problem that a protection area cannot be fully sampled due to the weakening of the suction force at the sampling pipe, being capable of being used bidirectionally, realizing the switching of positive-pressure injection or negative-pressure suction sampling detection by adjusting the direction, and improving the detection efficiency. And detectors of two specifications do not need to be designed, so that the production efficiency is improved, the production cost is reduced, and the market competitiveness of products is improved.

Description

Technical Field

[0001] The invention relates to the field of fire protection, and in particular to a two-way single-channel smoke detector for a fire cannon fire extinguishing system. Background Art

[0002] The aspirating smoke detector is a highly sensitive fire detection device that can actively collect air samples and analyze the smoke concentration in it to achieve early fire detection. The system is widely used in data centers, museums, warehouses and other places with high requirements for early fire detection. The detector continuously collects air samples from the protected area through a sampling pipe network composed of PVC pipes or steel pipes and sends them into the detector body. After entering the detector body, the air sample first passes through the filter assembly to filter out large dust particles, and then enters the detection chamber. The particle sensor in the detection chamber detects whether there are smoke particles and generates an alarm signal.

[0003] The problem existing in the use of existing smoke fire detection systems is that all air samples drawn by the sampling tube are sucked together and sent to the filter assembly and the laser detection chamber. Filtration and detection will produce greater resistance to 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. In addition, air samples are sucked into and sent to the detection chamber inside the detector, usually by positive pressure blowing or negative pressure suction of an air pump or fan in the detector shell, which will be selected according to the location and detection range to be detected. Manufacturers have to design two specifications of detector main structures according to the different methods of sending samples, so two corresponding production lines need to be set up, resulting in high production costs. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes a bidirectional single-channel smoke detector for a fire cannon fire extinguishing system.

[0005] The technical solution of the present invention is: a bidirectional single-channel smoke detector for a fire cannon fire extinguishing system, comprising a square shell and a particle sensor and a fan installed in the shell, both ends of the shell are provided with joint pipes, the two joint pipes correspond to each other coaxially, and an annular boss facing the joint pipe is provided inside the shell; two side channels are formed between the two sides of the annular boss and the two side plates of the shell, an independent chamber is formed inside the annular boss, and gaps are provided between both ends and the two end plates of the shell; the particle sensor is installed inside the annular boss, the size of the annular boss is smaller than the size of the inner cavity of the shell, filters are installed at both ends of the annular boss, the filters are symmetrically arranged, and air holes are provided in the middle of the two end surfaces of the annular boss; a fan is installed at the inner end of one of the joint pipes.

[0006] Preferably, the annular boss is an elongated annular boss, the length direction of the elongated annular boss is consistent with the length direction of the shell, and the side channels formed on both sides are symmetrical to each other and have the same size.

[0007] Preferably, the filter is filter cotton, and the filter cotton fills the filter cavity at the end of the shell.

[0008] Preferably, a partition is provided at the end of the annular boss, and the partition forms a filter cavity at the end of the annular boss, and a particulate sensor accommodating cavity is formed between the two end plates. A baffle whose lower end is connected to the bottom plate of the shell is provided in the middle of the filter cavity, and the baffle and the partition are both connected to the bottom plate of the shell. The height of the baffle is less than the depth of the filter cavity. The baffle forms a U-shaped channel inside the filter cavity, and the filter cotton is matched and arranged in the U-shaped channel. An arc-shaped notch is provided at the lower part of the partition, and the arc-shaped notch is connected to the U-shaped channel.

[0009] Preferably, the air holes are provided in a plurality, and the air holes are circular holes, and the plurality of air holes are arranged along the height direction of the annular boss, and the air holes at both ends are respectively close to the bottom plate and the sealing cover of the shell pair.

[0010] Preferably, one side plate of the shell is provided with arc-shaped slots and columnar clamps at both ends that can match each other, and the columnar clamp can be matched and clamped into the arc-shaped slot. The other side plate is also provided with an arc-shaped slot and a columnar clamp. The arc-shaped slots and columnar clamps between the two side plates are arranged alternately, and the arc-shaped slots and columnar clamps at the ends are arranged relatively.

[0011] Preferably, a cross support is provided on the bottom plate of the shell inside the annular boss, the bottom surface of the particle sensor is supported on the cross support, and both ends of the transverse plate of the cross support are respectively connected to the two side plates of the shell.

[0012] Preferably, the gap between the annular boss and one end plate of the shell is larger than the gap between the annular boss and the other end plate of the shell.

[0013] The beneficial technical effects of the present invention are: (1) After the air sample drawn by the detector enters the shell, part of it enters the inside of the long circular ring-shaped boss from the middle for filtration and smoke particle detection, and the rest flows out of the detector directly from the channels on both sides, thereby improving the smoothness of the air sample filtration detection process, reducing the resistance it encounters, and avoiding the problem that the suction force at the sampling tube is weakened, resulting in the protection area being unable to be fully sampled. At the same time, it can also effectively reduce the air flow at the filter, avoiding its short-term blockage, eliminating the need for frequent disassembly and maintenance, and facilitating the continuous and stable operation of the detection device.

[0014] (2) When the connector tube at the upper end of the detector is connected to the sampling tube, the fan draws the air sample from the upper part into the shell and sprays it at positive pressure to the inside of the long circular ring-shaped boss for filtration and detection. When the connector tube at the lower end is connected to the sampling tube, the fan generates negative pressure in the shell from the bottom, and the air sample is sucked into the inside of the long circular ring-shaped boss through negative pressure suction for filtration and detection. Therefore, the detector can be used in both directions. By adjusting the direction, the positive pressure spraying or negative pressure suction sampling detection can be switched. There is no need to design two specifications of detectors, which is conducive to improving production efficiency, reducing production costs, and improving the market competitiveness of products. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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 is a schematic diagram of the three-dimensional structure of the present invention after removing the sealing cover; Figure 4 This is a schematic diagram of the main structure of the present invention in a positive pressure spraying state; Figure 5 This is a schematic diagram of the main structure of the negative pressure suction state of the present invention; Figure 6 It is a schematic diagram of the three-dimensional structure of the present invention after removing the sealing cover, the particle sensor, the filter cotton and the fan; Figure 7 It is a schematic diagram of the three-dimensional structure after multiple detectors are docked in parallel.

[0016] In the figure, 1. shell, 11. joint pipe, 12. sealing cover, 14. side channel, 15. arc-shaped groove, 16. columnar clamp, 17. cross support, 2. long circular ring boss, 21. detection cavity, 22. filter cavity, 23. air hole, 24. partition, 241. arc-shaped notch, 25. baffle, 3. particle sensor, 4. fan, 5. filter cotton. DETAILED DESCRIPTION

[0017] Embodiment 1, see attached Figure 1-5A bidirectional single-channel smoke detector for a fire cannon fire extinguishing system comprises a square shell 1 and a particle sensor 3 and a fan 4 installed in the shell. Both ends of the shell 1 are provided with joint pipes 11, and the two joint pipes have the same size. An annular boss facing the joint pipe 11 is provided inside the shell 1. The annular boss is fixedly connected to the bottom plate of the shell 1. The upper end surface of the annular boss contacts with a sealing cover 12, so that an independent detection and filtering chamber 22 is formed inside the annular boss; two side channels 14 are formed between the two sides of the annular boss and the two side plates of the shell 1, and gaps are provided between the two ends and the two end plates of the shell 1. The gaps at the two ends make The air samples entering the two connecting pipes 11 can both enter the inside of the annular boss; the particulate matter sensor 3 is installed inside the annular boss, filters are installed at both ends of the annular boss, and air holes 23 are provided in the middle of the two end surfaces of the annular boss; a fan 4 is installed at the inner end of one of the connecting pipes 11, and an airflow sensor is installed in the connecting pipe 11 at the other end through a bracket. The airflow sensor is used to detect whether there is airflow passing through. If a malfunction occurs and the air sample fails to enter the detector normally, the airflow sensor can monitor it and send out an alarm signal, so as to eliminate the malfunction in time and avoid the phenomenon that the fire hazard cannot be detected in time due to the failure of the detector.

[0018] The annular boss is an elongated annular boss 2, the length direction of the elongated annular boss is consistent with the length direction of the shell 1, and the arc structures at both ends of the elongated annular boss can play a guiding role. After the air sample enters the shell 1 and contacts the end face of the elongated annular boss 2, it can be quickly diverted to both sides, reducing the resistance it encounters and improving the smoothness of the flow of the air sample.

[0019] There are several pores 23 arranged along the height direction of the annular boss. The number of pores 23 and the spacing between pores can be arranged arbitrarily according to needs. These pores 23 ensure that a sufficient amount of air sample enters the filter cavity 22 to ensure detection accuracy.

[0020] A cross support 17 is provided on the bottom plate of the shell 1 inside the annular boss, and the bottom surface of the particle sensor 3 is supported on the cross support 17. The particle sensor 3 is raised to a certain height by the cross support, which is conducive to the smooth entry of the air sample into the particle sensor 3.

[0021] The gap between the annular boss and one end plate of the housing 1 is larger than the gap between the annular boss and the other end plate of the housing 1 . The larger gap corresponds to the fan 4 , providing an operating space for installing and removing the fan 4 .

[0022] The working process and principle of the detector are as follows: when the detector is installed forward and sampling and testing is performed by positive pressure blowing, the joint pipe 11 at the upper end of the shell 1 is connected to the sampling pipe, and the fan 4 at the upper end is started. The fan draws the air sample from the sampling pipe into the shell 1, and part of the air sample is blown into the long circular ring-shaped boss 2 from the middle positive pressure to be filtered and detect smoke particles. The remaining air sample enters the two side channels 14 under the guidance of the arc end face, and then flows out directly from the joint pipe 11 at the other end; the detector is installed in the reverse direction. When sampling and testing is performed by negative pressure suction, the joint pipe 11 at the lower end of the shell 1 is adjusted upward, and then the joint pipe 11 is connected to the sampling tube, and the fan 4 at the lower end is started. The suction force of the fan 4 generates negative pressure in the shell 1, and the air sample is sucked from the sampling tube into the shell 1 through the negative pressure. Part of the air sample is sucked from the middle into the inside of the long circular ring-shaped boss 2 for filtration and smoke particle detection. The remaining air sample is sucked into the two side channels 14 under the guidance of the arc end face, and then flows out directly from the joint pipe 11 at the lower end.

[0023] During the sampling and detection process of the detector, the air sample has high patency and encounters less resistance, which can avoid the problem of weakening the suction force at the sampling tube and causing the protection area to be unable to be fully sampled. At the same time, the detector can also be used in both directions, and the switching of positive pressure blowing or negative pressure suction sampling detection can be achieved by adjusting the direction. There is no need to design two specifications of detector structures, which is conducive to improving production efficiency, reducing production costs, and improving the market competitiveness of products.

[0024] Embodiment 2, see attached Figure 2-3 6. This embodiment is basically the same as the first embodiment, and the similarities are not repeated here. The differences are as follows: the filter is a filter cotton 5, a partition 24 is provided at the end of the annular boss, and the partition forms a filter chamber 22 at the end of the annular boss, and a baffle 25 is provided in the middle of the filter chamber, the lower end of which is connected to the bottom plate of the housing 1, and the height of the baffle is less than the depth of the filter chamber 22. The baffle 25 forms a U-shaped channel inside the filter chamber 22, and the filter cotton 5 is matched and arranged in the U-shaped channel. The lower part of the partition 24 is provided with an arc-shaped notch 241. After the air sample enters the filter chamber 22, it will flow along the U-shaped channel, extending its flow distance in the filter cotton 5, increasing the filtering time of the air sample, and thereby improving the filtering effect of the filter cotton 5 on large particles of dust in the air sample.

[0025] Embodiment 3, see attached Figure 4 , 6-7, this embodiment is basically the same as the first embodiment, and the similarities are not repeated here. The difference is that: arc-shaped card slots 15 and columnar clamps 16 that can match each other are respectively provided at both ends of one side plate of the shell 1, and arc-shaped card slots and columnar clamps 16 are also provided on the other side plate, and the arc-shaped card slots 15 and columnar clamps 16 are arranged alternately between the two side plates. Multiple shells 1 can be connected side by side as a whole through the arc-shaped card slots and columnar clamps 16. The structure of the arc-shaped card slots 15 and columnar clamps arranged alternately is conducive to improving the connection stability between the shells 1. The connection structure can select the number of docking of the shells 1 according to the number of sampling tubes, so that the samples collected by multiple sampling tubes can be centrally managed and tested, which has the advantages of high flexibility and convenient operation.

Claims

1. A two-way single-channel smoke detector for a fire cannon extinguishing system, comprising a square housing and a particle sensor and a fan installed in the housing, characterized in that: Joint pipes are provided at both ends of the shell, and an annular boss facing the joint pipe is provided inside the shell; two side channels are formed between the two sides of the annular boss and the two side plates of the shell, and gaps are provided between both ends and the two end plates of the shell; the particle sensor is installed inside the annular boss, filters are installed at both ends of the annular boss, and air holes are provided in the middle of the two end surfaces of the annular boss; a fan is installed at the inner end of one of the joint pipes.

2. A two-way single-channel smoke detector for a fire cannon extinguishing system according to claim 1, characterized in that: The annular boss is an elongated annular boss, and the length direction of the elongated annular boss is consistent with the length direction of the shell.

3. A two-way single-channel smoke detector for a fire cannon extinguishing system according to claim 1, characterized in that: The filter is filter cotton.

4. A two-way single-channel smoke detector for a fire cannon fire extinguishing system according to claim 3, characterized in that: A partition is provided at the end of the annular boss, and the partition forms a filter cavity at the end of the annular boss. A baffle is provided in the middle of the filter cavity, and the lower end of the baffle is connected to the bottom plate of the shell. The height of the baffle is less than the depth of the filter cavity. The baffle forms a U-shaped channel inside the filter cavity. The filter cotton is matched and arranged in the U-shaped channel, and an arc-shaped notch is provided at the lower part of the partition.

5. A two-way single-channel smoke detector for a fire cannon fire extinguishing system according to claim 1, characterized in that: The air holes are provided in a plurality, and the plurality of air holes are arranged along the height direction of the annular boss.

6. A two-way single-channel smoke detector for a fire cannon fire extinguishing system according to claim 1, characterized in that: The two ends of one side plate of the shell are respectively provided with arc grooves and columnar clamping heads that can match each other, and the other side plate is also provided with arc grooves and columnar clamping heads. The arc grooves and columnar clamping heads between the two side plates are arranged alternately.

7. A two-way single-channel smoke detector for a fire cannon fire extinguishing system according to claim 1, characterized in that: A cross support is arranged on the shell bottom plate inside the annular boss, and the bottom surface of the particle sensor is supported on the cross support.

8. The two-way single-channel smoke detector for a fire monitor fire extinguishing system according to claim 1 is characterized in that: The gap between the annular boss and one end plate of the shell is larger than the gap between the annular boss and the other end plate of the shell.

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