Ignition safety monitoring device for printing and dyeing gas drying room

Abstract

The utility model discloses an ignition safety monitoring device for a printing and dyeing gas drying room, which is characterized in that a combustor is arranged in a circulating air flow channel of the gas drying room, an air pipe is arranged above the gas drying room, and an exhaust fan is arranged at the front end of the air pipe; the device is characterized in that a micro differential pressure switch is arranged on the air pipe, the micro differential pressure switch is connected to the control end of a safety relay, and the output end of the safety relay is connected with the control end of a timer; and the output end of the timer is connected with a burner power supply to supply power to the burner to work. According to the utility model, the micro differential pressure switch for detecting the pressure of the air duct is arranged on the air duct of the fuel gas drying room, the exhaust state of the fuel gas drying room before ignition is detected, and the micro differential pressure switch is linked with the power supply control part of the burner, so that abnormal burning of the burner when the exhaust fan fails or an exhaust path is blocked is prevented. The device is easy to control, low in cost and capable of effectively eliminating potential safety hazards.

Description

Technical Field

[0001] The utility model belongs to the technical field of printing and dyeing equipment, and particularly relates to a safety monitoring system for a gas-fired hot air drying chamber. Background Art

[0002] The burner of the gas-fired hot air drying chamber for printing and dyeing is arranged in the flow channel of the circulating air. Therefore, if there is accumulation of combustible gas, fabric short fibers or dust in the flow channel, the ignition action of the burner will cause deflagration of the mixed gas or explosion of the dust. Therefore, the exhaust fan needs to be pre-started for a certain period of time to purify the air in the drying chamber before ignition. However, if the exhaust fan fails or the exhaust path is blocked, even if the fan runs, the purpose may not be achieved, leaving a safety hazard. Summary of the Invention

[0003] The purpose of the utility model is to provide a safety monitoring system for a gas-fired hot air drying chamber, which can detect the exhaust state before ignition of the gas drying chamber, so as to ensure the safety control of ignition.

[0004] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0005] An ignition safety monitoring device for a printing and dyeing gas drying chamber, wherein a burner is arranged in the flow channel of the circulating air of the gas drying chamber, an air duct is arranged above the gas drying chamber, and an exhaust fan is arranged at the front end of the air duct; the characteristics are that: a differential pressure switch is arranged on the air duct, the differential pressure switch is connected to the control end of a safety relay, and the output end of the safety relay is connected to the control end of a timer; the output end of the timer is connected to the burner power supply to supply power to the burner for work. Before the burner works, the exhaust fan works. If the air flow velocity in the pipeline is normal, the reduced value of the air pressure will exceed the set value, and the differential pressure switch will close, and the safety relay will act. When the exhaust time exceeds the setting of the timer, the burner obtains power and starts to execute the ignition procedure. After the exhaust fan runs, if the exhaust is blocked due to duct blockage or fan failure and the duct pressure fails to drop to the set threshold value, the differential pressure switch will not close, which will cause the safety relay to be unable to output the timer start signal, and the burner will not be able to obtain power to work, thus realizing the safety control of ignition.

[0006] The further characteristics are that: a gas guide pipe is connected to the air duct, and the differential pressure switch is connected to the gas guide pipe. Connecting the differential pressure switch through the gas guide pipe can prevent damage caused by directly setting the differential pressure switch on the air duct.

[0007] Preferably, two differential pressure switches are respectively arranged at different positions on the air duct, and the two differential pressure switches are connected in series and then connected to the control terminal of the safety relay. Only when the two differential pressure switches are closed simultaneously, the safety relay will act, and finally the burner can be ignited. Through the redundant setting of the differential pressure switches, the safety hazards caused by the failure of the differential pressure switches are ensured, and the safe control of the burner ignition is ensured.

[0008] Preferably, a manual reset button is arranged on the safety relay. After the safety relay is disconnected, it must be reset by pressing the manual reset button, which further ensures the safe control of the burner ignition.

[0009] In the utility model, differential pressure switches for detecting the air duct pressure are arranged on the air duct of the gas drying room, the exhaust state before the ignition of the gas drying room is detected, and it is linked with the power control part of the burner, so as to prevent the abnormal combustion of the burner when the exhaust fan fails or the exhaust path is blocked. The control of the utility model is simple, the cost is low, and the safety hazards can be effectively eliminated. Brief Description of the Drawings

[0010] Figure 1 is a schematic structural diagram of the utility model. Detailed Embodiment

[0011] As Figure 1 shown, an ignition safety monitoring device for a printing and dyeing gas drying room, a burner is arranged in the flow channel of the circulating air of the gas drying room 1, an air duct 3 is arranged above the gas drying room 1, and an exhaust fan 2 is arranged at the front end of the air duct 3. Two differential pressure switches 6 are respectively connected to two different positions on the air duct 3 through two air guide pipes 4, the two differential pressure switches 6 are connected in series and then connected to the control terminal of the safety relay 8, and the output terminal of the safety relay 8 is connected to the control terminal of the timer 9. The output terminal of the timer 9 is connected to the burner power supply 10 to supply power to the burner for work. A manual reset button 5 is arranged on the safety relay 8.

[0012] Before the burner power supply is turned on for work, the exhaust fan 2 works. If the air flow velocity in the pipeline is normal, the reduced value of the air pressure will exceed the set value, and the two differential pressure switches 6 will be closed simultaneously, and the safety relay 8 will act. When the exhaust time exceeds the setting of the timer 9, the burner obtains power and starts to execute the ignition procedure. After the exhaust fan 2 operates, if the exhaust is not smooth due to air duct blockage or fan failure and the air duct pressure fails to drop to the set threshold value, the differential pressure switch 6 will not be closed, which will cause the safety relay 8 to be unable to output the start signal of the timer 9, and the burner will not be able to obtain power to work, thus realizing the safe control of ignition. Through the redundant setting of the two differential pressure switches 6, the safety hazards caused by the failure of the differential pressure switch 6 are ensured, and the safe control of the burner ignition is ensured.

[0013] After the safety relay 8 is disconnected, it must be reset by pressing the manual reset button 5, which further ensures the safe control of the burner ignition.

Claims

1. An ignition safety monitoring device for a printing and dyeing gas drying room, wherein a burner is arranged in the flow channel of the circulating air of the gas drying room, an air duct is arranged above the gas drying room, and an exhaust fan is arranged at the front end of the air duct; characterized in that: A differential pressure switch is provided on the air duct, and the differential pressure switch is connected to the control terminal of the safety relay. The output terminal of the safety relay is connected to the control terminal of the timer; the output terminal of the timer is connected to the burner power supply to supply power to the burner for operation.

2. The ignition safety monitoring device for a dyeing gas drying oven according to claim 1, wherein: An air duct is connected to the air duct, and the differential pressure switch is connected to the air duct.

3. The ignition safety monitoring device for a dyeing gas drying oven according to claim 1 or 2, characterized in that: Two differential pressure switches are respectively provided at different positions on the air duct, and the two differential pressure switches are connected in series and then connected to the control terminal of the safety relay.

4. The ignition safety monitoring device for a printing and dyeing gas drying room according to claim 3, wherein: An manual reset button is provided on the safety relay.

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