CN203869111U - Intelligent unmanned gas safety monitor - Google Patents

Abstract

The utility model discloses an intelligent unmanned gas safety monitor, which comprises a central control module, a sensor and a solenoid valve as a gas valve; the electromagnetic valve is arranged on a gas pipeline of a gas source and gas equipment; the sensor is connected with the central control module, and the electromagnetic valve is controlled by the central control module; the sensor is a Doppler radar sensor and is used for sensing whether personnel activities exist on the site; the central control module is integrated with a timing control device; the trigger end of the timing control device is connected with the signal output end of the Doppler radar sensor; the output end of the timing control device is connected with the control end of the electromagnetic valve. The intelligent unmanned gas safety monitor can implement active delay gas shutoff, fire stopping and alarming, and has high safety.

Description

Intelligent unmanned gas safety monitor

technical field

The utility model relates to an intelligent unmanned gas safety monitor.

Background technique

At present, gas safety protection devices in the market mostly use the concentration of gas leakage as the monitoring object, such as "gas leakage alarm device (Patent No. CN1201210590264)", a gas stove monitoring and alarm system and its implementation method (Patent No. Cooker wireless monitoring system (patent number CN201110374359), this gas alarm device is a passive alarm, only when there is a gas leak, the alarm can be activated, and the alarm will be prompted when the gas density reaches (1500-2500PPM). At this time, the CO density is already available. The possibility of secondary combustion or explosion is a passive prevention with low safety.

The patented automatic gas monitor (the application number is CN200720010818), its core idea is to discharge the leaked gas through the range hood to achieve the safety purpose, which is basically similar to the aforementioned scheme, but also has the problem of low safety.

Regardless of the prevention and measures of the above products, they are all "lag and passive" prevention schemes, which cannot provide early warning and timely containment, and cannot fundamentally eliminate the hidden danger of fire caused by gas.

On the other hand, there are many empty-nest elderly in the city, most of whom have the characteristics of old age and memory loss. Whenever they enter the kitchen and turn on the gas stove, they often turn around and immediately forget about the "stove fire"; there are also those who are at home with children Young parents, bachelors and many middle-aged people often forget to turn off the fire because they are busy with other things, resulting in many tragedies of property damage and casualties. The core reason is not gas leakage, but human negligence, and such The number of fires caused by accidents is far greater than the number of accidents caused by gas leakage. Therefore, many of the aforementioned schemes for realizing gas monitoring based on the concentration of gas leakage cannot prevent the occurrence of such accidents at all.

Therefore, it is necessary to design a novel intelligent unmanned gas safety monitor.

Utility model content

The technical problem to be solved by the utility model is to provide an intelligent unmanned gas safety monitor. The intelligent unmanned gas safety monitor can implement an active delay to turn off the gas and stop the fire alarm, and has high safety.

The technical solution of the utility model is as follows:

An intelligent unmanned gas safety monitor includes a central control module, a sensor and a solenoid valve as a gas valve; the solenoid valve is installed on the gas source and the gas pipeline of the gas-consuming equipment; the sensor is connected to the central control module, The solenoid valve is controlled by the central control module;

The sensor is a Doppler radar sensor, which is used to sense whether there are personnel activities at the scene;

The central control module is integrated with a timing control device; the trigger terminal of the timing control device is connected to the Doppler

The signal output terminal of the radar sensor; the output terminal of the timing control device is connected to the control terminal of the solenoid valve.

The timing control device is a time-delay relay module; the output terminal of the time-delay relay module is connected with a charging circuit; the charging circuit is formed in series by a resistor R3, an electrolytic capacitor C1 and a normally open switch of the time-delay relay module; One end of the electrolytic capacitor C1 is connected to one terminal of the solenoid valve through the normally closed switch of the delay relay module; the other end of the electrolytic capacitor C1 is directly connected to the other terminal of the solenoid valve.

The output terminal of the Doppler radar sensor is connected with the delay relay module through a level conversion circuit; the level conversion circuit includes an NPN type triode and resistor R2; the output terminal of the Doppler radar sensor is connected to the B pole of the triode , the E pole of the triode is grounded; the C pole of the triode is connected to the positive pole of the DC power supply through the resistor R2; the C pole is also connected to the signal input terminal of the delay relay module.

The intelligent unmanned gas safety monitor also includes a power adapter; the power adapter is used to convert AC mains power into DC power to supply power to the central control module.

The intelligent unmanned gas safety monitor also includes a button for controlling the solenoid valve and a display device for displaying the timing time and timing countdown.

The intelligent unmanned gas safety monitor also includes a gas leakage alarm module, and the two signal output terminals of the gas leakage alarm module are connected in parallel with the two wiring terminals of the solenoid valve.

The set timing time of the timing control device is 5-30 minutes.

The set timing time of the described timing control device is 20 minutes.

Beneficial effect:

The core idea of the intelligent unmanned gas safety monitor of the utility model is to change the concept of thinking, and create an original alarm scheme based on the "time length" instead of the "limit concentration" of the gas, and detect and determine the human body in an active way. Behavioral dynamics, prevent in advance at the "ideal time", completely cut off the gas source from the "root cause", and completely "people-oriented", so as to achieve reliable, accurate and fast gas safety guarantee.

The utility model can automatically monitor the dynamic situation of leaving people in good time and effectively and regularly close the gas gate valve. This model is designed as an automatic unmanned safety protection device for human-computer interaction, intelligent dynamic monitoring, and timely shutdown of gas. The function mainly sets the monitoring target object as a person. When people are active in the set area, the intelligent master controller will stand by and obey orders at will. Once the person leaves, the main air valve will be automatically and regularly closed. The main purpose is to completely solve and prevent the serious waste of gas and the occurrence of fire accidents caused by the overflow of water in the pot, the leakage of flame-out gas or the dry burning without water caused by leaving the stove fire for a long time; When there is a sudden power failure in a building or home, it will also automatically shut down the gas and stop the fire for emergency protection. Realize the complete elimination or prevention of long time leaving the stove unattended, resulting in no water and dry cooking in the cooking pot. While effectively preventing the serious waste of gas, the key is to prevent the occurrence of fire accidents.

The utility model has the multifunctional advantages of no operation, self-detection, self-timer, countdown display, automatic shut-off (gas main gate valve), unmanned safe and intelligent on-duty, and the like. When the device is powered on (connected to the power supply), as long as people enter the monitoring (such as kitchen) area, the intelligent main controller will automatically enter the delay monitoring dynamic duty. Just manually (each time must) lift the electromagnetic gate valve "Little Red Riding Hood" of the gas pipeline to start fire. Because, the smart master controller temporarily presets 20 minutes of automatic protection. Therefore, if a person has 1 to n times of behavioral activities and leaves for a short time within the time limit, the intelligent main controller will automatically cancel the travel (countdown) time at any time, and the gas will not stop shutting down. If you leave beyond the set time limit, the intelligent main controller will automatically close the main gas valve at regular intervals (including power failures) to realize automatic gas shutdown and cease-fire protection.

The above, because it can effectively realize the "advanced" active prevention and control technology, and realize the automatic closing of the gas gate valve when leaving people, can completely avoid or reduce the gas leakage and fire hazards that have plagued us for a long time;

The utility model is designed as a combination of man and machine, that is, it has the function of "double insurance" of manual opening and automatic closing, and is safe and reliable.

The utility model can further monitor and alarm the basic gas concentration, so that the function is further expanded and perfected. The linkage control of this additional gas concentration monitoring and alarm is another guarantee to strengthen the safety and reliability of the scene.

At the same time, the utility model realizes that at any moment of fire use, if there is a sudden power failure in a building or a household, the gas valve can be automatically and quickly shut down for protection.

In addition, the Doppler radar sensor is the sensor finally selected after many tests. Compared with other sensors (such as infrared sensors, voice-activated sensors, photoelectric sensors, etc.), this Doppler radar sensor has good sensitivity and is resistant to Strong interference ability, especially suitable for applications in kitchens and other occasions.

Description of drawings

Fig. 1 is the working flow chart of intelligent unmanned gas safety monitor;

Figure 2 is a schematic diagram of an intelligent unmanned gas safety monitor.

Figure 3 is a block diagram of the overall structure of the intelligent unmanned gas safety monitor.

Description of labels: 1-power adapter; 2-intelligent main controller (central microprocessor); 3-Doppler radar microwave sensor; 4-gas leak detector; 5-time digital display; 6-emergency stop (test) Button; 7-power supply, signal, control cable; 8-electromagnetic gate valve; 9-gas pipeline; 10-gas hose, 11-gas stove.

Detailed ways

The utility model will be described in further detail below in conjunction with accompanying drawing and specific embodiment:

Example 1:

Example 1: A scheme for alarming based on a delay relay

An intelligent unmanned gas safety monitor includes a central control module, a sensor and a solenoid valve as a gas valve; the solenoid valve is installed on the gas source and the gas pipeline of the gas-consuming equipment; the sensor is connected to the central control module, The solenoid valve is controlled by the central control module;

The sensor is a Doppler radar sensor, which is used to sense whether there are personnel activities at the scene;

The central control module is integrated with a timing control device; the trigger terminal of the timing control device is connected to the Doppler

The signal output terminal of the radar sensor; the output terminal of the timing control device is connected to the control terminal of the solenoid valve.

The timing control device is a time-delay relay module; the output terminal of the time-delay relay module is connected with a charging circuit; the charging circuit is formed in series by a resistor R3, an electrolytic capacitor C1 and a normally open switch of the time-delay relay module; One end of the electrolytic capacitor C1 is connected to one terminal of the solenoid valve through the normally closed switch of the delay relay module; the other end of the electrolytic capacitor C1 is directly connected to the other terminal of the solenoid valve.

The output terminal of the Doppler radar sensor is connected with the delay relay module through a level conversion circuit; the level conversion circuit includes an NPN type triode and resistor R2; the output terminal of the Doppler radar sensor is connected to the B pole of the triode , the E pole of the triode is grounded; the C pole of the triode is connected to the positive pole of the DC power supply through the resistor R2; the C pole is also connected to the signal input terminal of the delay relay module.

The intelligent unmanned gas safety monitor also includes a power adapter; the power adapter is used to convert AC mains power into DC power so as to supply power to the central control module.

The intelligent unmanned gas safety monitor also includes a button for controlling the solenoid valve and a display device for displaying the timing and countdown [usually a digital display tube, or a liquid crystal display].

Description of working process:

After the power adapter is connected or plugged in, the intelligent main controller 2 (ie the delay relay module) and the Doppler radar detector 5 (ie the aforementioned Doppler radar sensor) are powered simultaneously. And the two-digit digital display 3 on the box cover of the intelligent main controller 2 immediately displays the time number of 20 minutes and is on standby. At the same time, the Doppler radar sensor 5 emits 1.25GHz ultrasonic waves in a "hemispherical" fan shape to the space. After receiving the human moving reflected wave, it generates the first dynamic pulse signal to trigger the delay of the random module inside the intelligent main controller. The start-up of the relay and the power-on work of the relay; the two-digit digital display 3 starts a 20-minute countdown digital display, and at the same time opens the capacitor charging for the pulse of the solenoid valve; After n pulses are received, reset and recalculation instructions will be issued repeatedly at random. Once the delay timer is completed clockwise to "zero", the relay will lose power, and the synchronous digital display will return to [20 minutes] and stop charging the capacitor. At the moment of closing the relay, the fully charged capacitor is switched to start the discharge of the electromagnetic gate valve 8, and finally realizes the execution of the gas "shutdown" command. The system then goes into standby mode.

The delay relay module is a mature control module, triggered by the Doppler radar detector, and the delay time is adjustable. If the delay relay module adopts JK12 type module, it is adjusted by 0-99 seconds/0-99 minutes potentiometer, and has LED digital tube display.

The sensor is only responsible for signal output, no self-locking. The length of the delay is in charge of the time base chip + memory in the delay relay module.

If there is another personnel activity within the T time, the system will be reset and the countdown of the T time will be restarted.

The alarm has the function of automatically shutting off the gas source when the power is off. When the power is off, the contacts of the relay return to the normal state. At this time, the capacitor C charges the solenoid valve, and the solenoid valve acts to cut off the gas circuit.

Example 2: Alarm based on delay relay and integrated with gas leakage alarm scheme

As shown in Figure 1-3, on the basis of Embodiment 1, the intelligent unmanned gas safety monitor also includes a gas leakage alarm module, two signal output terminals of the gas leakage alarm module and two connection terminals of the solenoid valve in parallel. In this way, any one of the output ports of the gas leakage alarm module and the microprocessor can control the action of the electromagnetic valve.

In addition, as a supplement, the intelligent unmanned gas safety monitor also has an emergency stop/test button (corresponding to the TK button in Figure 2); emergency stop and test are the same button, but the application purposes are different. Emergency stop is an operation in an emergency situation during operation, and the test is a detection of the control response during operation. It is based on the closure of J1 after the front-end relay of the solenoid valve is de-energized, so that the electrolytic capacitor connected in parallel (stored electricity) can discharge the pulse of the solenoid valve coil to realize the shutdown control. The working principle of the emergency stop/test button is the same as that of the aforementioned power-off protection, and the emergency stop/test button is to cut off the power supply.

Note: The 20-minute time limit setting of the above preferred value is determined based on the following facts: "For a kitchen of 7 square meters, if there are 20 cubic meters. When the pipeline pressure is 0.35Mpa and the gas is fully opened, the concentration of CO in the air is as follows: Reaching 12.5-74%, it only takes 30 minutes for the leakage to reach the explosive concentration.”

Claims (8)

1. An intelligent unmanned gas safety monitor is characterized in that it includes a central control module, a sensor and a solenoid valve as a gas valve; the solenoid valve is installed on the gas pipeline of the gas source and gas-consuming equipment; the sensor Connected with the central control module, the solenoid valve is controlled by the central control module; The sensor is a Doppler radar sensor, which is used to sense whether there are personnel activities at the scene; The central control module is integrated with a timing control device; the trigger terminal of the timing control device is connected to the signal output terminal of the Doppler radar sensor; the output terminal of the timing control device is connected to the control terminal of the solenoid valve. 2. The intelligent unmanned gas safety monitor according to claim 1, wherein said timing control device is a delay relay module; the output terminal of the delay relay module is connected with a charging circuit; said The charging circuit is composed of resistor R3, electrolytic capacitor C1 and the normally open switch of the delay relay module in series; one end of the electrolytic capacitor C1 is connected to a terminal of the solenoid valve through the normally closed switch of the delay relay module; the other end of the electrolytic capacitor C1 Connect directly to the other terminal of the solenoid valve. 3. The intelligent unmanned gas safety monitor according to claim 2 is characterized in that, the output terminal of the Doppler radar sensor is connected with the time-delay relay module through a level conversion circuit; described level conversion circuit Including NPN type triode and resistor R2; the output terminal of the Doppler radar sensor is connected to the B pole of the triode, and the E pole of the triode is grounded; the C pole of the triode is connected to the positive pole of the DC power supply through the resistor R2; the C pole is also connected to the delay Signal input of the relay module. 4. The intelligent unmanned gas safety monitor according to claim 1, further comprising a power adapter; the power adapter is used to convert AC mains power into DC power to supply power for the central control module. 5. The intelligent unmanned gas safety monitor according to claim 4, further comprising a button for controlling the solenoid valve and a display device for displaying the timing time and timing countdown. 6. The intelligent unmanned gas safety monitor according to claim 1, further comprising a gas leakage alarm module, the two signal output terminals of the gas leakage alarm module are connected in parallel with the two terminals of the solenoid valve. 7. The intelligent unmanned gas safety monitor according to any one of claims 1-6, characterized in that, the set timing time of the timing control device is 5-30 minutes. 8. The intelligent unmanned gas safety monitor according to claim 7, wherein the set timing time of the timing control device is 20 minutes.