Fire monitoring and alarming device for cable trench of transformer substation

Abstract

The utility model relates to a fire monitoring and alarming device for a cable trench of a transformer substation, which is applied to the technical field of fire-fighting early warning of the transformer substation, realizes an air-breathing type smoke-sensing fire detector, opens a miniature suction fan through a controller to suck gaseous cracking substances into the detector through a sampling pipe, and when the gaseous cracking substances pass through a conical filter screen, the conical filter screen is closed. Dust particles in air can be filtered layer by layer, meanwhile, a vibrator is periodically started through a time controller to vibrate the shell, so that the shell slides up and down in a sliding groove through a sliding block, the shell can continuously float up and down through a compression spring in the sliding process, and an elastic ball in the shell bounces in the up-down sliding process; the surface of the conical filter screen is vibrated, dust particles adhered to the surface of the conical filter screen are shaken down and are discharged from the sewage draining exit along the surface of the conical filter screen, and when air is sucked into the detector through the sampling pipe, the dust particles in gaseous cracking substances can be filtered, so that the false alarm condition is avoided.

Description

Technical Field

[0001] The utility model relates to a substation cable trench fire monitoring and alarm device, in particular to a substation cable trench fire monitoring and alarm device applied in the technical field of substation fire early warning. Background Art

[0002] Cracking mass analysis-based fire hazard early warning technology is a fire early warning technology with important application value. At present, the transmission and distribution lines in and out of substations are generally laid through cables in cable trenches. In order to save land and construction costs, one or several cable trenches are generally shared. The cables are buried underground through the cable trenches. Once a fire occurs, it is difficult to detect. In particular, substations are generally unmanned. Once a fire occurs, it often takes a long time to be discovered through fire alarms or other means.

[0003] The specification of Chinese patent CN204965668U discloses an online monitoring device for cable trench fires in substations, consisting of a cable trench fire online monitoring substation, a communication network, and a master station. The monitoring substation comprises a temperature sensor, a smoke sensor, a microprocessor, a power module, a communication module, and the like. The signal acquisition module is responsible for receiving monitoring data signals transmitted back from various terminal sensors. The communication module is responsible for transmitting collected terminal signals and terminal fault signals to the master station. The master station quickly locates the fire or fault terminal by determining whether the amount of information sent back by each substation exceeds a preset alarm threshold, and initiates corresponding early warnings and auxiliary decision-making. This new device is suitable for online monitoring of cable trench fires in unmanned substations.

[0004] Aspirating smoke fire detectors are prone to false alarms in cable trench environments with a large amount of gaseous cracking substances, and dust particles may be mistaken for smoke particles. Utility Model Content

[0005] In view of the above-mentioned existing technologies, the technical problem to be solved by the present invention is that aspirated smoke fire detectors are prone to false alarms in cable trench environments with a large amount of gaseous cracking substances, and dust particles may be mistakenly identified as smoke particles.

[0006] In order to solve the above problems, the utility model provides a substation cable trench fire monitoring and alarm device, comprising a detector installed in the cable trench, a sampling tube fixedly connected to the top of the detector, a micro suction fan installed in the sampling tube, a hose threadedly connected to the end of the sampling tube away from the detector, and a filter mechanism detachably connected to the end of the hose away from the sampling tube;

[0007] The filtering mechanism includes a shell installed on the inner wall of the cable trench, the top of the shell is threadedly connected to the top cover, the top of the top cover is provided with an air inlet, and the air inlet is threadedly connected to the hose, the outer wall of the shell is annularly equidistantly connected with four mounting plates, the upper and lower ends of the mounting plates are fixedly connected with connecting blocks, and the filtering mechanism is fixed to the cable trench through screws and connecting blocks, three sewage outlets are equidistantly opened on the side wall of the shell, the lower sections of the sewage outlets are detachably connected with conical filter screens, multiple elastic balls are placed on the top of the conical filter screens, a vibrator is fixedly connected to the cable trench below the shell, and the power end of the vibrator is connected to the bottom end of the shell, a slide groove is opened on the mounting plate close to one end of the shell, the shell is slidably connected to the slide groove through a slider, and compression springs are provided in the gap between the slider and the slide groove.

[0008] In the above-mentioned fire monitoring and alarm device, when air is sucked into the detector through the sampling tube, dust particles contained in the gaseous cracking medium can be filtered to avoid false alarms.

[0009] As a further improvement of the present application, a controller for controlling the micro suction fan is installed on the cable trench, a time controller is fixedly connected to the side wall of the shell, and the time controller is electrically connected to the vibrator.

[0010] As a further improvement of the present application, the diameter of the elastic ball is greater than the height of the sewage outlet.

[0011] As a further improvement of the present application, the filtering sizes of the three conical filter screens decrease sequentially from bottom to top.

[0012] As another improvement of the present application, a plurality of grooves are equidistantly excavated in an annular shape on the lower cross section of the sewage outlet, and a clamping plate is provided on the outer ring of the conical filter screen. A clamping block corresponding to the groove is fixedly connected to the bottom end of the clamping plate, and the clamping block is engaged with the groove.

[0013] As another improved supplement of the present application, corresponding screw holes are drilled in the side walls of the card slot and the card block, and the screw holes are threaded with bolts that can be manually screwed.

[0014] As another improved supplement of the present application, the inner wall of the air inlet is threadedly connected to a mesh plate with a screw block at the bottom end.

[0015] In summary, the aspirating smoke fire detector is installed in the cable trench. The micro suction fan is turned on by the controller to suck the gaseous cracking medium into the detector through the sampling tube. When the gaseous cracking medium passes through the conical filter, the dust particles in the gas can be filtered layer by layer. At the same time, the vibrator is turned on regularly by the time controller to vibrate the outer shell, so that the outer shell slides up and down in the slide groove through the slider, and can float up and down continuously through the compression spring during the sliding. When the outer shell slides up and down, the elastic ball inside the shell bounces, vibrating the surface of the conical filter, shaking off the dust particles stuck on it, and discharging them from the drain outlet along the surface of the conical filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a diagram showing the installation structure of an aspirating smoke fire detector in a cable trench according to the first embodiment of the present application;

[0017] Figure 2 This is an axonometric diagram of an aspirating smoke fire detector according to the first embodiment of the present application;

[0018] Figure 3 Explosion diagram of the aspirating smoke fire detector according to the first and second embodiments of the present application;

[0019] Figure 4 This is a side sectional view of an aspirating smoke fire detector according to the first embodiment of the present application;

[0020] Figure 5 This is a partial structural diagram of an aspirating smoke fire detector according to the first embodiment of the present application;

[0021] Figure 6 This is a diagram of the installation structure of the conical filter screen according to the second embodiment of the present application;

[0022] Figure 7 For this application Figure 6 Enlarged view of point A in the middle.

[0023] Description of the numbers in the figure:

[0024] 1. Cable trench; 2. Detector; 3. Sampling tube; 4. Housing; 5. Hose; 6. Air inlet; 7. Top cover; 8. Mounting plate; 9. Conical filter; 10. Mesh plate; 11. Connecting block; 12. Elastic ball; 13. Time controller; 14. Vibrator; 15. Slider; 16. Slide; 17. Compression spring; 18. Drain outlet; 19. Bolt; 20. Clamp plate; 21. Clamp block; 22. Clamp slot. DETAILED DESCRIPTION

[0025] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0026] The first implementation method:

[0027] Figure 1-5 The present invention shows a substation cable trench fire monitoring and alarm device, comprising a detector 2 installed in a cable trench 1. A sampling tube 3 is fixedly connected to the top of the detector 2. A micro suction fan is installed in the sampling tube 3. A hose 5 is threadedly connected to the end of the sampling tube 3 away from the detector 2. A filter mechanism is detachably connected to the end of the hose 5 away from the sampling tube 3.

[0028] The filtering mechanism includes a shell 4 installed on the inner wall of the cable trench 1, the top of the shell 4 is threadedly connected to the top cover 7, the top of the top cover 7 is provided with an air inlet 6, and the air inlet 6 is threadedly connected to the hose 5, the outer wall of the shell 4 is annularly equidistantly connected with four mounting plates 8, the upper and lower ends of the mounting plates 8 are fixedly connected with connecting blocks 11, and the filtering mechanism is fixed to the cable trench 1 by screws and the connecting blocks 11, three sewage outlets 18 are equidistantly opened on the side wall of the shell 4, the lower cross-section of the sewage outlet 18 can be detachably connected with a conical filter screen 9, a plurality of elastic balls 12 are placed on the top of the conical filter screen 9, a vibrator 14 is fixedly connected to the cable trench 1 below the shell 4, and the power end of the vibrator 14 is connected to the bottom end of the shell 4, a slide groove 16 is opened on the mounting plate 8 near the end of the shell 4, the shell 4 is slidably connected to the slide groove 16 through a slider 15, and compression springs 17 are provided in the gaps between the slider 15 and the slide groove 16.

[0029] A controller for the micro-suction blower is mounted on cable trench 1. A time controller 13 is fixedly connected to the sidewall of housing 4 and electrically connected to vibrator 14. The diameter of elastic ball 12 is greater than the height of drain outlet 18, and the filter sizes of the three conical filters 9 decrease from bottom to top.

[0030] Working principle: The aspirating smoke fire detector 2 is installed in the cable trench 1. The micro-suction fan is turned on by the controller to suck the gaseous cracking substance into the detector 2 through the sampling tube 3. When the gaseous cracking substance passes through the conical filter 9, the dust particles in the gas can be filtered layer by layer. At the same time, the vibrator 14 is regularly turned on by the time controller 13 to vibrate the shell 4, so that the shell 4 slides up and down in the slide groove 16 through the slider 15, and can float up and down continuously through the compression spring 17 during the sliding. When the shell 4 slides up and down, the elastic ball 12 inside the shell 4 bounces, vibrating the surface of the conical filter 9, shaking off the dust particles adhering to it, and discharging them from the drain outlet 18 along the surface of the conical filter 9;

[0031] When air is sucked into the detector 2 through the sampling tube 3, dust particles contained in the gaseous cracking medium can be filtered to avoid false alarms.

[0032] The second implementation method:

[0033] Figure 3 and Figure 6-7 It is shown that a plurality of grooves 22 are equidistantly cut in an annular shape on the lower cross section of the sewage outlet 18, and a card plate 20 is provided on the outer ring of the conical filter screen 9. A card block 21 corresponding to the card slot 22 is fixedly connected to the bottom end of the card plate 20, and the card block 21 is engaged with the card slot 22. Corresponding screw holes are cut on the side walls of the card slot 22 and the card block 21, and the screw holes are threadedly connected to bolts 19 that can be screwed manually. The inner wall of the air inlet 6 is threadedly connected to a mesh plate 10 with a screw block at the bottom.

[0034] Working principle: When the conical filter screen 9 is damaged after long-term use, the bolt 19 can be manually tightened to remove it from the screw hole, and then the block 21 can be pulled out from the slot 22 to remove the conical filter screen 9 for replacement. When replacing the mesh plate 10, the top cover 7 can be removed from the outer shell 4, and the mesh plate 10 can be removed from the air inlet 6 by holding the screw block for quick replacement. The mesh plate 10 is installed in the air inlet 6 to prevent the elastic ball 12 from entering the hose 5 during the bounce.

[0035] The conical filter screen 9 and the screen plate 10 are designed to be detachable, so that they can be quickly replaced.

[0036] In view of current actual needs, the protection scope of the above-mentioned implementation mode adopted in this application is not limited to this. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the protection scope of this utility model.

Claims

1. A substation cable trench fire monitoring and alarm device, comprising a detector (2) installed in a cable trench (1), characterized in that: The top of the detector (2) is fixedly connected to a sampling tube (3), a micro suction fan is installed in the sampling tube (3), an end of the sampling tube (3) away from the detector (2) is threadedly connected to a hose (5), and an end of the hose (5) away from the sampling tube (3) is detachably connected to a filter mechanism; The filtering mechanism comprises a shell (4) mounted on the inner wall of the cable trench (1), the top of the shell (4) is threadedly connected to the top cover (7), the top of the top cover (7) is provided with an air inlet (6), and the air inlet (6) is threadedly connected to the hose (5), the outer wall of the shell (4) is annularly equidistantly connected to four mounting plates (8), the upper and lower ends of the mounting plates (8) are fixedly connected to the connecting blocks (11), and the filtering mechanism is fixed to the cable trench (1) through screws and the connecting blocks (11), the side wall of the shell (4) is equidistantly provided with three sewage outlets (18), the sewage outlets (18) The lower cross section of the opening (18) is detachably connected to a conical filter (9), and a plurality of elastic balls (12) are placed on the top of the conical filter (9). A vibrator (14) is fixedly connected to the cable trench (1) below the housing (4), and the power end of the vibrator (14) is connected to the bottom end of the housing (4). A chute (16) is cut at one end of the mounting plate (8) close to the housing (4), and the housing (4) is slidably connected to the chute (16) through a slider (15), and a compression spring (17) is provided at the gap between the slider (15) and the chute (16).

2. A substation cable trench fire monitoring and alarm device according to claim 1, characterized in that: A controller for controlling the micro suction fan is installed on the cable trench (1), a time controller (13) is fixedly connected to the side wall of the housing (4), and the time controller (13) is electrically connected to the vibrator (14).

3. The substation cable trench fire monitoring and alarm device according to claim 1, characterized in that: The diameter of the elastic ball (12) is greater than the height of the sewage outlet (18).

4. The substation cable trench fire monitoring and alarm device according to claim 1, characterized in that: The filtering sizes of the three conical filter screens (9) decrease in sequence from bottom to top.

5. The substation cable trench fire monitoring and alarm device according to claim 1, characterized in that: The lower cross section of the sewage outlet (18) is provided with a plurality of slots (22) equidistantly cut in an annular shape. The outer ring of the conical filter screen (9) is provided with a card plate (20). The bottom end of the card plate (20) is fixedly connected with a card block (21) corresponding to the slot (22), and the card block (21) is engaged with the slot (22).

6. The substation cable trench fire monitoring and alarm device according to claim 5, characterized in that: The side walls of the clamping slot (22) and the clamping block (21) are bored with corresponding screw holes, and the inner threads of the screw holes are connected with bolts (19) that can be screwed manually.

7. The substation cable trench fire monitoring and alarm device according to claim 1, characterized in that: The inner wall of the air inlet (6) is threadedly connected to a mesh plate (10) with a screw block at the bottom end.

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