Fireproof early warning system for flue gas pipeline

Abstract

The utility model provides a smoke pipeline fireproof early warning system which solves the technical problems that if open fire is caused in an indoor pipeline or a draught fan due to friction or other reasons in an existing smoke treatment pipeline, the open fire can be rapidly burnt under the wind action of the draught fan, and the pipeline is sealed and almost cannot be rescued. The device can be widely applied to the field of fire-fighting early warning of ventilating ducts; the device specifically comprises a flue gas pipeline and an indoor ventilation pipeline communicated with the bottom of the flue gas pipeline, and is characterized in that a fireproof valve is arranged at an inlet of the indoor ventilation pipeline, a fan is arranged at the tail end of the indoor ventilation pipeline, a fire fighting pipeline is communicated with the upper portion of the flue gas pipeline, and a spraying device is arranged in the flue gas pipeline; the spraying device is controlled by a manual valve or an automatic spraying electromagnetic valve; a temperature sensor is also arranged in the flue gas pipeline and is used for monitoring the temperature change in the flue gas pipeline; the system further comprises a PLC, the PLC is electrically connected with the temperature sensor, and the PLC is electrically connected with the automatic spraying electromagnetic valve, the fireproof valve and the draught fan.

Description

Technical Field

[0001] The utility model belongs to the technical field of fire prevention warning of ventilation ducts, and particularly relates to a smoke duct fire prevention warning system. Background Art

[0002] The existing smoke treatment pipeline is normally sealed and no leakage is allowed. The smoke generated indoors is directly transported to the smoke treatment device on the top of the building. If an open fire is caused in the indoor pipeline or fan due to friction or other reasons, the open fire will burn quickly under the action of the fan wind, and the pipeline seal is almost impossible to rescue. Utility Model Content

[0003] The purpose of the utility model is to solve the deficiencies of the above-mentioned technology and provide a smoke duct fire prevention early warning system.

[0004] To this end, the utility model provides a smoke duct fire warning system, including a smoke duct, the bottom of the smoke duct is connected to an indoor ventilation duct, characterized in that a fire damper is arranged at the entrance of the indoor ventilation duct, a fan is arranged at the end of the indoor ventilation duct, a fire fighting duct is connected above the smoke duct, a sprinkler device is arranged in the smoke duct, and the sprinkler device is controlled by a manual valve or an automatic sprinkler solenoid valve;

[0005] A temperature sensor is also provided in the smoke duct to monitor the temperature changes in the smoke duct; the system also includes a PLC controller, which is electrically connected to the temperature sensor through an A / D converter, and two levels of temperature thresholds are set in the PLC controller; the PLC controller is electrically connected to the automatic sprinkler solenoid valve, fire damper and fan through relays.

[0006] Furthermore, the manual valve and the automatic spray solenoid valve are arranged in parallel to jointly control the switch of the spray device.

[0007] Furthermore, a drain valve is provided on the indoor ventilation duct between the fire damper and the fan to drain the accumulated water in the indoor ventilation duct after spraying.

[0008] Furthermore, the model of the automatic sprinkler solenoid valve is ADK11-20A-02E-DC24V.

[0009] Furthermore, the model of the PLC controller is 6ES731-2AH14.

[0010] The utility model provides a smoke duct fire prevention early warning system, which has the following beneficial effects:

[0011] The utility model can quickly judge the fire situation, make a quick response, spray water to cool down and extinguish the fire in time and accurately, and prevent the fire from spreading. In addition, it does not hinder the normal pipeline air supply at ordinary times, ensuring the normal operation of the smoke pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a circuit design schematic diagram of the utility model. DETAILED DESCRIPTION

[0013] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments to help understand the content of the present invention. The methods used in the present invention are all conventional methods unless otherwise specified; the raw materials and devices used are all conventional commercial products unless otherwise specified.

[0014] like Figure 1 As shown, the utility model provides a smoke duct fire warning system, including a smoke duct, the bottom of the smoke duct is connected to an indoor ventilation duct, a fire damper is arranged at the entrance of the indoor ventilation duct, and a fan is arranged at the end of the indoor ventilation duct, and the fan is used to increase the air circulation speed of the indoor ventilation duct and accelerate the exhaust of smoke in the indoor ventilation duct. The top of the smoke duct is connected to a fire extinguishing duct, and a sprinkler device is arranged in the smoke duct. The sprinkler device is controlled by a manual valve or an automatic sprinkler solenoid valve, and the manual valve and the automatic sprinkler solenoid valve are arranged in parallel.

[0015] The model of the automatic sprinkler solenoid valve is ADK11-20A-02E-DC24V.

[0016] A temperature sensor is also provided in the smoke duct to monitor the temperature change in the smoke duct. The system also includes a PLC controller, which is electrically connected to the temperature sensor through an A / D converter, and two-level temperature thresholds are set in the PLC controller, which is electrically connected to the automatic sprinkler solenoid valve, fire damper and fan through relays.

[0017] In one implementation, the primary temperature threshold is 60 degrees Celsius, and the secondary temperature threshold is 80 degrees Celsius. The model of the PLC controller is 6ES731-2AH14.

[0018] Under normal conditions, the fire damper and fan are opened, the manual valve and automatic sprinkler solenoid valve are closed, and the indoor smoke enters the smoke duct through the indoor ventilation duct and is then discharged.

[0019] When the flue gas temperature in the flue gas duct is high, the temperature sensor detects that the temperature in the flue gas duct exceeds the first-level temperature threshold, and the PLC controller sends a high temperature warning signal to remind the on-duty personnel that the temperature in the flue gas duct is high. The on-duty personnel can manually open the manual valve and start the spraying device to spray and cool down the flue gas duct.

[0020] When an open flame occurs in the smoke in the smoke duct, the temperature sensor detects that the temperature in the smoke duct exceeds the secondary temperature threshold. The PLC controller sends out an over-temperature alarm signal, controls the fire damper and fan to close, opens the automatic sprinkler solenoid valve, and starts the sprinkler device to spray and cool down the smoke duct.

[0021] A drain valve is also provided on the indoor ventilation duct between the fire damper and the fan to drain the accumulated water in the indoor ventilation duct after spraying to prevent affecting the normal use of the fan.

[0022] In the description of the present invention, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inside", "outside", "back", "middle", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0023] However, what is described above is only a specific embodiment of the present invention and should not be used to limit the scope of implementation of the present invention. Therefore, the replacement of equivalent components, or equivalent changes and modifications made according to the scope of protection of the patent of the present invention should still fall within the scope covered by the claims of the present invention.

Claims

1. A smoke duct fire warning system, comprising a smoke duct, the bottom of which is connected to an indoor ventilation duct, characterized in that: A fire damper is installed at the entrance of the indoor ventilation duct, a fan is installed at the end of the indoor ventilation duct, a fire protection duct is connected above the smoke duct, and a sprinkler device is installed in the smoke duct. The sprinkler device is controlled by a manual valve or an automatic sprinkler solenoid valve; A temperature sensor is also provided in the smoke duct to monitor the temperature changes in the smoke duct; the system also includes a PLC controller, which is electrically connected to the temperature sensor through an A / D converter, and two levels of temperature thresholds are set in the PLC controller; the PLC controller is electrically connected to the automatic sprinkler solenoid valve, fire damper and fan through relays.

2. A smoke duct fire warning system according to claim 1, characterized in that: The manual valve and the automatic sprinkler solenoid valve are arranged in parallel to jointly control the sprinkler device switch.

3. A smoke duct fire warning system according to claim 1 or 2, characterized in that: A drain valve is also provided on the indoor ventilation duct between the fire damper and the fan to drain the accumulated water in the indoor ventilation duct after spraying.

4. A smoke duct fire warning system according to claim 3, characterized in that: The model of the automatic sprinkler solenoid valve is ADK11-20A-02E-DC24V.

5. A smoke duct fire warning system according to claim 3, characterized in that: The model of the PLC controller is 6ES731-2AH14.

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