CN111930065A - Control circuit for active safety of household kitchen - Google Patents

Abstract

The invention discloses a control circuit for active safety in a home kitchen, comprising a programmable logic controller, an MCGS, and a sensor. The programmable logic controller, the MCGS, and the sensor are connected together through a Modbus bus, and the sensor will detect The data is sent to the man-machine interface, and the man-machine interface intuitively displays the concentration value of oil fume and natural gas in the kitchen. When the concentration value is higher than the safe value, the man-machine interface and the programmable logic controller make a judgment and send out Commands to control alarms, range hoods, doors and windows, and the action of disconnecting gas lines. The invention can automatically detect the oil and gas in the room, and deal with the three situations of normal natural gas content, exceeding the standard and serious exceeding the standard respectively, so as to ensure the safe use of the kitchen.

Description

A control circuit for active safety in home kitchen

technical field

The invention relates to a safety control circuit, in particular to a control circuit for active safety in a home kitchen.

Background technique

With the development of society, people pay more and more attention to the health and safety of the body. In the current kitchen use, for safety, some newly developed stoves have built-in automatic fire extinguishing function, and some range hoods are also designed with a fume alarm function. These designs reflect the care and concern for health and life, but these designs The initiative of safety is not enough. We think that there is a danger, such as the harmful gas in the kitchen reaching a certain concentration, but the alarm is far from enough, not to mention that the range hood does not alarm when it is not working. The ideal situation is that the safety system should be a part that can work independently, and can also mobilize other devices to actively eliminate hidden dangers when danger occurs.

SUMMARY OF THE INVENTION

Aiming at the problems existing in the prior art, the present invention provides a control circuit that can automatically detect the oil and gas in the room, and deal with three situations of normal natural gas content, exceeding the standard and seriously exceeding the standard, so as to ensure the safe use of the kitchen.

The object of the present invention is achieved through the following technical solutions.

A control circuit for active safety in a home kitchen, comprising a programmable logic controller, MCGS, and a sensor, the programmable logic controller, MCGS, and sensor are connected together through a Modbus bus, and the sensor transmits detected data to a In the man-machine interface, the man-machine interface intuitively displays the concentration value of oil fume and natural gas in the kitchen. When the concentration value is higher than the safe value, the man-machine interface and the programmable logic controller make judgments and issue instructions to control the alarm. appliances, range hoods, doors and windows, and the act of disconnecting gas pipes.

The programmable logic controller is connected in series with a 24V power supply and a power button through an intermediate relay, and an emergency stop button is also connected in series with the 24V power supply and the power button.

The programmable logic controller is connected with a motor through an intermediate relay, and the programmable logic controller is connected with a speaker, an indicator light, a solenoid valve switch and a range hood switch.

The control method of the programmable logic controller includes:

1) When the carbon dioxide concentration in the air is less than 0.1%, the green light of the range hood is on; otherwise, the speaker of the range hood sounds, the range hood is turned on, and the red light of the range hood is on;

2) When the methane concentration in the air is less than 1%, the natural gas green light is on;

3) When the methane concentration in the air is greater than or equal to 1% and less than or equal to 3%, the natural gas speaker will sound, the natural gas yellow light will be on, the range hood will be turned on, and the door will be opened to open the window;

4) When the methane concentration in the air is greater than 3%, the range hood is turned on, the door is opened, the window is opened, the gas inlet pipe valve is closed, the natural gas speaker sounds, and the natural gas red light is on.

Compared with the prior art, the present invention has the advantages that: when the concentration value is higher than the safe value, the human-machine interface and the PLC make judgments and send out instructions to control the alarm, the range hood, the doors and windows and the actions of disconnecting the gas pipeline, Thereby, effective monitoring, alarming and self-processing of kitchen safety are realized to ensure life safety. It can automatically detect the oil and gas in the room, and deal with the three situations of normal natural gas content, exceeding the standard and serious exceeding the standard, to ensure the safety of the kitchen. The circuit is scientifically designed, reliable in work, powerful in function, and meets the needs of work, and solves the problem of active safety in the use of the kitchen. The circuit structure is not complicated, easy to manufacture, easy to use, and can be mass-produced.

Description of drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is the control flow chart of the programmable logic controller.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Generally, the content of methane in the air is only a few tenths of a percent, and the explosion limit of methane is 5%. above. The concentration of carbon dioxide in the normal air is 0.03%. When the concentration of carbon dioxide in the air reaches 1%, people will feel dull, inattentive, and flustered. When the concentration of carbon dioxide in the air reaches 1.5%-2.0%, people will feel Asthma, headache, dizziness. When the carbon dioxide concentration is higher, the function of the human body is seriously disrupted. The designed carbon dioxide concentration working point of the present invention is 0.1%.

As shown in Figure 1, a control circuit for active safety in a home kitchen includes a programmable logic controller, MCGS, and a sensor. The programmable logic controller, MCGS, and sensors are connected together through a Modbus bus, and the sensor The detected data is sent to the man-machine interface, which intuitively displays the concentration value of oil fume and natural gas in the kitchen. When the concentration value is higher than the safe value, the man-machine interface and the programmable logic controller make a judgment. And send out instructions to control the action of alarm, range hood, doors and windows and disconnecting gas pipeline, so as to realize effective monitoring, alarm and self-treatment of kitchen safety and ensure life safety.

The programmable logic controller is connected in series with a 24V power supply and a power button through an intermediate relay, and an emergency stop button is also connected in series with the 24V power supply and the power button.

The programmable logic controller is connected with a motor through an intermediate relay, and the programmable logic controller is connected with a speaker, an indicator light, a solenoid valve switch and a range hood switch.

As shown in Figure 2, the control method of the programmable logic controller includes:

1) When the carbon dioxide concentration in the air is less than 0.1%, the green light of the range hood is on; otherwise, the speaker of the range hood sounds, the range hood is turned on, and the red light of the range hood is on;

2) When the methane concentration in the air is less than 1%, the natural gas green light is on;

3) When the methane concentration in the air is greater than or equal to 1% and less than or equal to 3%, the natural gas speaker will sound, the natural gas yellow light will be on, the range hood will be turned on, and the door will be opened to open the window;

4) When the methane concentration in the air is greater than 3%, the range hood is turned on, the door is opened, the window is opened, the gas inlet pipe valve is closed, the natural gas speaker sounds, and the natural gas red light is on. When the user presses the stop button or the stop button in the HMI, the system stops working. When the user presses the emergency stop button, the system is powered off.

The main power supply of this circuit is 220V. It has three buttons: system start button, system stop button, emergency stop button, and an air switch to disconnect the electricity of the whole system. When the home is unoccupied for a long time, all switches are turned off. This switch can only be turned off when it is on.

The main components used in this circuit are Xinjie XD3-32T-PLC, MCGS, 24V brushed motor, methane sensor, carbon dioxide sensor, range hood, and solenoid valve. PLC and MCGS play the main control role. PLC connects components other than sensors to MCGS and sensors through Modbus Rtu protocol to monitor the concentration of oil fume and natural gas in the home kitchen. respond accordingly.

This circuit divides the natural gas in the household kitchen air into three cases: less than or equal to 1%, between 1% and 3%, and greater than 3%. When the concentration of natural gas in the air of the family kitchen is less than 1%, it is a normal situation, so the natural gas green light in the safety use control system of the family kitchen is always on. When the concentration of natural gas in the air is between 1% and 3%, it is moderately exceeding the standard, so the natural gas yellow light in the home kitchen safety use control system is on, the natural gas speaker sounds, and the range hood is turned on. When the concentration of natural gas in the air of the home kitchen is greater than 3%, it is a serious condition of exceeding the standard, so the natural gas red light in the home kitchen safety use control system is on, the natural gas speaker sounds, the range hood is turned on, the doors and windows of the home kitchen are automatically opened, and the natural gas inlet pipeline solenoid valve closure.

Precautions for the installation of this circuit:

The main requirements for the installation position in this circuit are the solenoid valve and the sensor. When the natural gas leakage is seriously exceeding the standard, the solenoid valve plays a role in gas-cutting relief, so the solenoid valve needs to be installed on the household pipeline, but it must be installed behind the gas meter in order not to affect the natural gas charge.

Claims (4)

1. A control circuit for active safety of a household kitchen comprises a programmable logic controller, an MCGS (micro control system), and a sensor, and is characterized in that the programmable logic controller, the MCGS, and the sensor are connected together through a Modbus, the sensor transmits detected data to a human-computer interface, the human-computer interface visually displays concentration values of oil smoke and natural gas in the kitchen, and when the concentration values are higher than a safety value, the human-computer interface and the programmable logic controller make judgment and send instructions to control actions of an alarm, a range hood, a door and a window and disconnect a gas pipeline.

2. A control circuit for active safety of home kitchen according to claim 1, characterized in that said programmable logic controller is connected in series with 24V power supply and power supply button through an intermediate relay, said 24V power supply and power supply button is also connected in series with emergency stop button.

3. A control circuit for active safety of a home kitchen according to claim 1, characterized in that the programmable logic controller is connected with a motor through an intermediate relay, and the programmable logic controller is connected with a speaker, an indicator light, a solenoid valve switch and a range hood switch.

4. A control circuit for active safety of home kitchen according to claim 1, characterized in that the control method of the programmable logic controller comprises:

1) when the concentration of carbon dioxide in the air is less than 0.1%, the oil smoke green light is on, otherwise, the loudspeaker of the range hood is sounded, the range hood is turned on, and the red light of the range hood is on;

2) when the concentration of methane in the air is less than 1%, the natural gas is lighted in green;

3) when the concentration of methane in the air is more than or equal to 1% and less than or equal to 3%, the natural gas loudspeaker is sounded, the natural gas yellow lamp is lighted, the range hood is opened, and the door is opened and the window is opened;

4) when the concentration of methane in the air is more than 3%, the range hood is opened, the door and the window are opened, the valve of the gas pipeline to the home is closed, the natural gas loudspeaker is sounded, and the natural gas red light is on.

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