CN110652673B - Automatic fire extinguishing system for single cabinet - Google Patents

Abstract

The invention provides a single cabinet automatic fire extinguishing system, which comprises: a controller, a temperature sensor, at least one smoke sensor and a fire suppression device. When the controller determines that the concentration monitored by any one smoke sensor is abnormal, sampling the monitoring information at sampling intervals which can be divided by the calculation intervals of the controller, and judging whether to perform fire extinguishing operation or not based on the sampling results. The invention can reduce false alarm and improve the fire extinguishing accuracy.

Description

Single cabinet automatic fire extinguishing system

technical field

The invention relates to a single-cabinet automatic fire extinguishing system, which is used for extinguishing fires in small-scale equipment in the fire-fighting work of a machine room.

Background technique

In the daily operation and maintenance process of the computer room, it is necessary to deal with small-scale equipment fires in the fire-fighting work of the computer room, such as a fire inside the cabinet. Relying on the fire alarm monitoring device in the computer room, this kind of small-scale fire that is detected by the fire alarm monitoring in the computer room and notified to the operation and maintenance personnel to use a portable carbon dioxide fire extinguisher to manually extinguish the fire will not only easily cause operational errors in panic, but also cumbersome operations will delay the fire. LOSS OF DATA AND EQUIPMENT.

Therefore, there is an urgent need to provide a fire extinguishing device that can respond sensitively under small fire conditions, avoid shutting down air conditioners and fresh air equipment, and can automatically spray fire extinguishing agents to extinguish fires at the fire point.

Contents of the invention

In view of the above technical problems, the embodiment of the present invention provides a single-cabinet automatic fire extinguishing system that responds sensitively in a small fire, avoids shutting down the air conditioner and fresh air equipment, and can automatically spray fire extinguishing agent at the fire point to extinguish the fire.

The technical scheme adopted in the present invention is:

An embodiment of the present invention provides an automatic fire extinguishing system for a single cabinet, including: a controller, a temperature sensor, at least one smoke sensor, and a fire extinguishing device. temperature, and send the monitored temperature information to the controller, the installation position of the temperature sensor is the constant temperature or the position of the basic constant temperature when the equipment in the cabinet is in normal operation; the smoke sensor is set in the smoke sensor in the cabinet The installation position of the smoke sensor is used to monitor the smoke concentration inside the cabinet and send the monitored concentration information to the controller. The smoke sensor installation position is a position where it is easy to monitor the smoke; the fire extinguishing device is arranged in the cabinet The top of the top, including a frame fixed on the top, a fire extinguisher and a pressing mechanism arranged on the frame, the pressing mechanism is used to press the fire extinguisher based on the spray control command sent by the controller, and the fire extinguisher in the fire extinguisher The agent is sprayed vertically downwards to the inside of the cabinet; the controller is used to receive monitoring information and process it according to a preset calculation interval, the monitoring information includes the temperature value sent by the temperature sensor and the temperature value sent by the smoke sensor Concentration value, if the processing result at a certain calculation moment indicates that there is an abnormality in the concentration value sent by any smoke sensor, it will enter the early warning control stage, wherein, in the early warning control stage, the controller performs a sampling interval according to the preset The monitoring information is sampled, and based on the sampling result, it is determined whether to send the spraying control instruction, and the preset calculation interval is an integer multiple of the preset sampling interval.

Optionally, the controller determines whether to send the spraying control instruction based on the following conditions:

The first case: if the monitoring information collected during the sampling period indicates that all the monitoring values are normal, the spraying control command will not be sent, and the early warning control stage will be exited;

The second situation: if the monitoring information collected at the first sampling moment represents all the monitoring values or more than 80% of the monitoring values are abnormal, and is higher than the value at the calculation time when it is determined to enter the early warning control stage, and at The monitoring information collected at the second sampling time indicates that all the monitoring values or more than 80% of the monitoring values are abnormal and higher than the value at the first sampling time, or the monitoring of any sensor cannot be collected at the second sampling time information, then send the spraying control command and give an alarm;

The third case: if no monitoring information can be collected at the first sampling time, the spraying control command is sent and an alarm is issued.

Optionally, the pressing mechanism includes a motor, a lead screw, a travel switch and a pressure block, one end of the lead screw is connected to the motor shaft of the motor, and the other end is fixed on the top of the frame, and the pressure block is connected to the connected to the lead screw, the travel switch is used to limit the briquetting block, and the motor is used to drive the screw rod based on the spraying control command sent by the controller, thereby driving the briquetting block to move downward. , when the pressing block moves downward against the travel switch, the handle of the fire extinguisher is pressed.

Optionally, when the briquetting block is against the travel switch, the travel switch sends a pressure signal to the controller, and the controller controls the spraying time after the preset spraying time based on the received pressure signal. The motor is reversed.

Optionally, the preset spraying time is 5s.

Optionally, when the concentration value is greater than an alarm concentration threshold, it indicates that there is an abnormality, and the alarm concentration threshold is 0.65-15.5% FT.

Optionally, when the temperature value is greater than an alarm temperature threshold, it indicates that there is an abnormality, and the alarm temperature threshold is 55°C.

Optionally, the fire extinguisher is a conventional fire extinguisher weighing less than 20kg.

The single-cabinet automatic fire extinguishing system provided by the embodiment of the present invention can accurately monitor the fire situation in the cabinet in real time because a temperature sensor and at least one smoke sensor are installed inside the cabinet, and only any one of the smoke sensors When a fire situation is detected, it will enter the early warning control stage. In the early warning control stage, the controller will take samples at a sampling interval that can be divisible by the calculation interval, and determine whether to carry out fire extinguishing operations based on the sampling results, instead of immediately Fire extinguishing operations can avoid misjudgment and improve the accuracy of fire extinguishing.

Description of drawings

Fig. 1 is the structural representation of the single cabinet automatic fire extinguishing system that the embodiment of the present invention provides;

Fig. 2 is the structural representation of the fire extinguishing device that the embodiment of the present invention provides

Detailed ways

In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.

As shown in Figures 1 and 2, the embodiment of the present invention provides a single-cabinet automatic fire extinguishing system, which can be used to extinguish fires in a small range of high-value electronic equipment in the cabinet, including: a controller 1, a temperature sensor 2, at least one Smoke sensor 3 and fire extinguishing device 4. The temperature sensor 2 is installed at the temperature sensing installation position in the cabinet to monitor the temperature inside the cabinet and send the monitored temperature information to the controller 1. The temperature sensor installation position is when the equipment in the cabinet is in normal operation The position of constant temperature or basically constant temperature, that is, the position where the temperature does not change much, the basic constant temperature is the temperature obtained by performing multiple measurements on different positions under the normal operating state of the equipment, and then observing the measurement results. The smoke sensor 3 is arranged at the installation position of the smoke detector in the cabinet, and is used to monitor the smoke concentration inside the cabinet, and sends the monitored concentration information to the controller. The top inside the cabinet includes a frame 401 fixed on the top, a fire extinguisher 402 arranged on the frame 401 and a pressing mechanism, the pressing mechanism is used to press the fire extinguisher based on the spray control command sent by the controller, and spray the fire extinguishing agent in the fire extinguisher vertically downward To the inside of the cabinet; the controller 1 is used to receive monitoring information and process it according to a preset calculation interval, the monitoring information includes the temperature value sent by the temperature sensor 2 and the concentration value sent by the smoke sensor 3, if The processing result at a certain calculation moment indicates that there is an abnormality in the concentration value sent by any smoke sensor, and then enters the early warning control stage, wherein, in the early warning control stage, the controller samples the monitoring information according to the preset sampling interval, and The spraying control instruction is selectively sent based on the sampling result, and the preset calculation interval is an integer multiple of the preset sampling interval.

In the embodiment of the present invention, the controller 1 can be a controller with data receiving and processing capabilities, can be set in the control room, and communicate with the temperature sensor 2, the smoke sensor 3 and the motor 403 respectively. The controller 1 internally stores an alarm concentration threshold and an alarm temperature threshold. In one example, the alarm concentration threshold may be 0.65-15.5%FT, and the alarm temperature threshold may be 55°C. In one example, the controller 1 can process the received information at a calculation interval of 6s, that is, the controller reads the smoke concentration and temperature values from the smoke sensor and the temperature sensor every 6s, and reads The concentration value and temperature value are compared with the alarm concentration threshold and the alarm temperature threshold respectively, and based on the comparison results, it is judged whether there is any abnormality in the value. normal. In the case where the calculation interval is 6s, in a preferred example, the sampling interval may be 2s. Further, if the controller 1 cannot read the values of the temperature sensor and the smoke sensor at a certain calculation time, an alarm signal will be sent. If at a certain calculation moment, the controller 1 determines that the concentration value monitored by any one of the plurality of smoke sensors is abnormal, it enters the early warning control stage. At this stage, controller 1 will determine whether to send a spraying control command based on the sampling results, which can be determined according to the following four situations:

The first case: if the monitoring information collected during the sampling period indicates that all the monitoring values are normal, the spraying control command will not be sent, and the early warning control stage will be exited, and the normal calculation time will be resumed. In the case where the calculation interval is 6s and the sampling interval is 2s, if the sampling is performed 2 seconds after the calculation time when entering the early warning control stage, if the sampled value returns to normal, that is, all the monitoring values are normal, then after 2 seconds Sampling again, if the sampled value is still normal, then sample again after 2 seconds, if the sampled value is still normal, then it means that the previous calculation time is a false alarm, cancel the early warning control, and restore the normal calculation time, that is, the situation is No alarm or spray control commands are sent.

The second situation: if the monitoring information collected at the first sampling moment represents all the monitoring values or more than 80% of the monitoring values are abnormal, and is higher than the value at the calculation time corresponding to the early warning control stage, and at The monitoring information collected at the second sampling time indicates that all the monitoring values or more than 80% of the monitoring values are abnormal and higher than the value at the first sampling time, or the monitoring of any sensor cannot be collected at the second sampling time information, then send the spraying control command and give an alarm. In the case where the calculation interval is 6s and the sampling interval is 2s, if the sampling is performed 2 seconds after the calculation time when entering the early warning control stage, if all the values sampled or at least 80% of the values exceed the threshold, and the value is higher than the calculated If the values at all times are high, then sample again after 2 seconds. If all the values sampled or at least 80% of the values exceed the threshold and are higher than the previous sampled value, or any sensor cannot sample data, then it means If the warning is true, then send a spraying control instruction, that is, spray after 4 seconds.

Furthermore, the field test results in the real environment show that in some cases, under the effective sampling interval, due to the relatively closed environment in the cabinet, the difference between the two sampling values of the smoke sensor will be small, that is, the second The numerical change between the subsample and the first sample is less discriminative. Therefore, in a preferred embodiment, in the second case, it is determined that the condition for sending the spraying control command "the monitoring information collected at the second sampling moment represents all the monitoring values or more than 80% of the monitoring values are abnormal, and the ratio The value at the first sampling time is high" can be replaced with "The monitoring information collected at the second sampling time indicates that all the monitoring values or more than 80% of the monitoring values are abnormal, and only the monitoring values sampled by the temperature sensor are higher than the first The value of sampling time is high". That is to say, in the second case, if the monitoring information collected at the first sampling moment indicates that all the monitoring values or more than 80% of the monitoring values are abnormal, and the calculation time corresponding to entering the early warning control stage is determined to be The value is high, and the monitoring information collected at the second sampling time indicates that all the monitoring values or more than 80% of the monitoring values are abnormal, and all the values collected at the second sampling time or the collected temperature sensor values are higher than the first If the value at the first sampling moment is high, or the monitoring information of any sensor cannot be collected at the second sampling moment, then the spraying control command is sent and an alarm is given.

The third case: if no monitoring information can be collected at the first sampling time, the spraying control command is sent and an alarm is issued. In the case where the calculation interval is 6s and the sampling interval is 2s, if sampling is performed 2 seconds after the calculation time when entering the early warning control stage, if any sensor cannot sample data, it means that the on-site environment has affected the sensor , then immediately send the spray control command, that is, spray after 2 seconds.

The fourth situation: if other situations other than the second and third situations occur during the sampling period, an alarm will be issued, but no spraying control command will be sent.

In the embodiment of the present invention, the controller 1 can issue a sound 2 alarm through its own alarm. In the embodiment of the present invention, the number of temperature sensors 2 and smoke sensors 3 can be set as required, and the present invention is not particularly limited, as long as the fire can be monitored comprehensively and accurately. In one example, different numbers of smoke sensors can be set according to the degree of heat generation of the electronic equipment in the cabinet. Fewer smoke sensors, for example one, may be arranged around electronic equipment with less heat generation.

In the embodiment of the present invention, the frame 401 of the fire extinguishing device 4 can be fixed on the top of the cabinet by bolts to form a base for placing the fire extinguisher 402, and the frame 401 can be made of aluminum alloy. The fire extinguisher 402 is fixed on the base of the frame 401, and can be a commercially available conventional fire extinguisher below 20kg, using common fire extinguishers such as carbon dioxide and dry powder as fire extinguishing agent consumables. The pressing mechanism can be installed on the side of the frame 401, and can include a motor 403, a travel switch 404, a lead screw 405 and a pressure block 406 arranged on the frame, and the motor 403 can be fixed on the side of the frame 401 through a connecting seat. One end of the lead screw 405 is connected with the motor shaft of the motor 403, and the other end is fixed on the top of the frame 401. One end of the pressure block 406 is connected with the nut of the lead screw 404, and the other end is connected with the slider through the connecting rod, and the slider can slide It is arranged on the slide rail between the top of the frame and the connecting seat. The limit switch 404 is arranged on the connecting seat, which is basically flush with the position of the lower handle of the fire extinguisher, and is used to limit the pressure block 406. The motor 403 is used to The spraying control command sent by the controller drives the screw rod, and then drives the briquetting block to move downwards, and when the briquetting block 406 moves downwards against the travel switch, the handle of the fire extinguisher is pressed. Specifically, the briquetting block 406 moves downwards driven by the lead screw 405, and then presses down the upper handle of the fire extinguisher until the upper handle and the lower handle of the fire extinguisher are in contact, and the handle is pressed. At this time, due to the formation of the switch 405 and the lower handle, The position of the handle is substantially flush, and the pressure block 406 will resist the travel switch 405 and cannot continue to move downward, thereby pressing the handle of the fire extinguisher all the time. At the same time, when the briquetting block 406 is against the travel switch 405, the travel switch 404 sends the pressing signal to the controller 1, and the controller 1 will control the click 403 to reverse after the preset spraying time based on the received pressing signal. Specifically, when receiving the pressing signal, the controller will control the motor 403 to continue to drive, and control the motor 403 to reverse after the pressing block 406 continues to press the handle of the fire extinguisher for a preset spraying time, driving the pressing block 406 to move upwards and return to complete the fire extinguisher. spray action. In one example, the preset spraying time can be 5s, that is, the controller 1 controls the reverse rotation of the motor after a delay of 5s after the pressing block 406 completely presses the handle of the fire extinguisher, so that all the fire extinguishing agent in the fire extinguisher can be sprayed inside the cabinet , so as to be able to comprehensively extinguish the fire and prevent the resurgence of the ashes. In the embodiment of the present invention, the motor 403 can be a DC motor, and the driving force generated can make the pressing force of the pressing block 406 greater than the cracking pressure of the fire extinguisher, so that all the fire extinguishing agent of the fire extinguisher can be sprayed inside the cabinet within the spraying time.

To sum up, the single-cabinet automatic fire extinguishing system provided by the embodiment of the present invention can accurately monitor the fire situation in the cabinet in real time because the temperature sensor and at least one smoke sensor are installed inside the cabinet, and as long as the smoke sensor Any one of the detected fire situations will enter the early warning control stage. In the early warning control stage, the controller will sample at a sampling interval that can be divisible by the calculation interval, and determine whether to carry out fire extinguishing operations based on the sampling results, rather than once determined The fire extinguishing operation is carried out immediately after the early warning, which can avoid misjudgment and improve the accuracy of fire extinguishing. Moreover, the fire extinguisher used is a common fire extinguisher under 20kg, which can be placed on the top of the cabinet. The fire extinguisher uses common fire extinguishers such as carbon dioxide and dry powder as fire extinguishing consumables, which are low in cost and easy to replace.

The above-described embodiments are only specific implementations of the present invention, used to illustrate the technical solutions of the present invention, but not to limit them, and the protection scope of the present invention is not limited thereto, although the present invention has been described with reference to the foregoing embodiments Detailed description, those of ordinary skill in the art should understand that any person familiar with the technical field within the technical scope disclosed in the present invention can still modify the technical solutions described in the foregoing embodiments or can easily think of changes. Or perform equivalent replacements for some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (3)

1. A single cabinet automatic fire suppression system comprising: a controller, a temperature sensor, at least one smoke sensor and a fire extinguishing device,

the temperature sensor is arranged at a temperature sensing installation position in the cabinet and is used for monitoring the temperature in the cabinet and sending the monitored temperature information to the controller, and the temperature sensing installation position is a constant temperature or a basically constant temperature position of equipment in the cabinet in a normal running state;

the smoke sensor is arranged at a smoke sensing installation position in the cabinet and is used for monitoring the smoke concentration in the cabinet and sending the monitored concentration information to the controller, and the smoke sensing installation position is a position where the smoke is easy to monitor;

the fire extinguishing device is arranged at the top in the cabinet and comprises a frame fixed at the top, a fire extinguisher arranged on the frame and a pressing mechanism, wherein the pressing mechanism is used for pressing the fire extinguisher based on a spraying control instruction sent by the controller to spray the fire extinguishing agent in the fire extinguisher vertically downwards into the cabinet;

the controller is configured to receive monitoring information and process the monitoring information according to a preset calculation interval, where the monitoring information includes a temperature value sent by the temperature sensor and a concentration value sent by the smoke sensor, and if a processing result at a certain calculation time indicates that an abnormality exists in the concentration value sent by any one smoke sensor, the controller enters an early warning control stage, and in the early warning control stage, the controller samples the monitoring information according to a preset sampling interval, and determines whether to send the spraying control instruction based on the sampling result, where the preset calculation interval is an integer multiple of the preset sampling interval;

the controller determines whether to send the spray control instruction based on:

first case: if the collected monitoring information during sampling represents that all monitoring values are normal, not sending the spraying control instruction, and exiting the early warning control stage;

second case: if the monitoring information collected at the first sampling moment represents that all monitoring values or more than 80% of monitoring values are abnormal and the monitoring information is higher than the value of the calculation moment when the early warning control stage is confirmed, and the monitoring information collected at the second sampling moment represents that all monitoring values or more than 80% of monitoring values are abnormal and the monitoring value sampled by the temperature sensor is higher than the value of the first sampling moment only or the monitoring information of any one sensor cannot be collected at the second sampling moment, the spraying control instruction is sent and an alarm is given;

third case: if any monitoring information cannot be acquired at the first sampling moment, sending the spraying control instruction and giving an alarm;

the pressing mechanism comprises a motor, a screw rod, a travel switch and a pressing block, one end of the screw rod is connected with a motor shaft of the motor, the other end of the screw rod is fixed at the top of the frame, the pressing block is connected with the screw rod, the travel switch is used for limiting the pressing block, the motor is used for driving the screw rod based on a spraying control instruction sent by the controller, and then the pressing block is driven to move downwards, and when the pressing block moves downwards to prop against the travel switch, a handle of the fire extinguisher is pressed;

when the pressing block abuts against the travel switch, the travel switch sends a pressing signal to the controller, and the controller controls the motor to rotate reversely after the spraying time is preset based on the received pressing signal; the preset spraying time is 5s;

the fire extinguisher is a conventional fire extinguisher below 20 kg;

when the concentration value is larger than the alarm concentration threshold value, an abnormality is indicated;

and when the temperature value is larger than the alarm temperature threshold value, indicating that an abnormality exists.

2. The single cabinet automatic fire suppression system according to claim 1, wherein the alarm concentration threshold is 0.65-15.5% ft.

3. The single cabinet automatic fire suppression system according to claim 1, wherein the alarm temperature threshold is 55 ℃.