Patent Application
20110308825
a) Field of the Invention The present invention relates to automatic fire extinguishing equipment of a fume hood, and more particularly to automatic fire extinguishing equipment of a fume hood that can prevent fire from spreading and expanding, thereby enabling the fume hood to actually achieve a fire-proof effect.
b) Description of the Prior Art
Not all existing fume hoods used in chemical experiments are provided with automatic fire extinguishing equipment. Referring to
The primary object of the present invention is to provide automatic fire extinguishing equipment of a fume hood, to prevent the fume hood from starting fire accidentally in experiments, and to avoid the fire from spreading and expanding, thereby enabling the fume hood to actually achieve a fire-proof effect.
The aforementioned automatic fire extinguishing equipment of a fume hood is composed of a cabinet which is provided with a workbench. A vent pipe is located above the cabinet, and ventilation equipment is installed at a place close to a pipe opening of the vent pipe. A movable window panel is located in a front side of the cabinet, and a top rim of the workbench is provided with a first and a second detecting element, as well as automatic fire extinguishing equipment mechanisms. A front end or a rear end of the ventilation equipment is provided with a fire damper which is driven by a drive mechanism, such that when the fire occurs accidentally at the workbench, a fire signal can be first detected by the first detection element to issue alarming sound or alerting flash in real time, thereby notifying personnel to pay attention to and prepare against the fire. On the other hand, the ventilation equipment will be automatically stopped by the drive mechanism and the fire damper will be closed to close the vent pipe. When a thick smoke or high temperature signal is detected by the second detection element, the window panel will be closed through the drive mechanism, and the automatic fire extinguishing equipment mechanisms will be activated to terminate the flame, so as to prevent the thick smoke or flame from channeling into the vent pipe to spread and expand the fire, which will result in burning other connected fume hoods or processing equipment; therefore, the fume hood can actually achieve a fire-proof effect.
The aforementioned first detection element of the automatic fire extinguishing equipment of the fume hood can be a flame detector or other detector that can sense the flame, in order to detect the flame signal momentarily.
The aforementioned second detection element of the automatic fire extinguishing equipment of the fume hood can be a smoke or temperature detector, in order to detect the thick smoke or high temperature signal.
The aforementioned first detection element, second detection element, a manual activation device and a shutdown device of the automatic fire extinguishing equipment mechanisms, as well as the drive mechanism of the fire damper and the window panel, are connected respectively to a control host which is used to interpret the detected signal to control shutdown of the ventilation equipment, closure of the fire damper and the window panel, issuing of an alarming signal, as well as an operation of the automatic fire extinguishing equipment.
To enable a further understanding of said objectives and the technological methods of the invention herein, brief description of the drawings is provided below followed by detailed description of the preferred embodiments.
Referring to
The first detection element 25, the second detection element 26, the automatic fire extinguishing equipment mechanisms 27, and the drive mechanism 281, are connected respectively to a control host 29 which interprets a detected signal to control closure of the ventilation equipment 23, the fire damper 28, and the movable window panel 24, as well as a spraying operation of the automatic fire extinguishing equipment mechanisms 27. The control host 29 is connected with a buzzer 30, a flashlight 31, and an alarm 32.
By assembling the aforementioned components, when fire occurs accidentally at the workbench 21 from chemical experiments, the fire signal can be first detected by the first detection element 25, and then is interpreted by the control host 29, followed by issuing alarming sound or alerting flash from the buzzer 30 or the flashlight 31. Next, the drive mechanism 281 will drive the ventilation equipment 23 to stop operation, and close the fire damper 28 to close the vent pipe 22, so as to prevent thick smoke and flame from channeling into the vent pipe 22, which results in burning other connected fume hoods or processing equipment to cause a severe disaster. When the thick smoke or high temperature signal is detected by the second detection element 26, the signal will be interpreted by the control host 29, followed by issuing the alarming sound from the alarm 32. Next, the drive mechanism 241 will drive the movable window panel 24 to close, and activate the automatic fire extinguishing equipment mechanisms 27 to spray out halon for terminating the flame, so as to prevent the thick smoke and flame from channeling into the vent pipe 22, which results in burning other connected fume hoods or processing equipment to cause a severe disaster; therefore, the fume hood will actually achieve a fire-proof effect. The aforementioned control host 29 is provided with an activation device for manually opening the fire damper 28 and the ventilation equipment 23, such that after the fire is extinguished, the fire damper 28 and the ventilation equipment 23 can be opened to expel hazardous gases. In addition, the control host 29 is provided with an emergency activation device and an emergency shutdown device that can manually activate or stop spraying the halon from the fire extinguishing equipment in an urgent condition, so as to allow an operator to manually operate the spraying of the halon when he or she is on-site, or to manually stop spraying the halon according to determination of an on-site personnel that the fire has been extinguished.
Referring to
Referring to
Accordingly, the present invention employs the double-loop detection elements, in association with the movable fire damper and the window panel, to allow the fume hood to achieve the purpose of preventing from starting a cascade of fire, thereby further enabling the automatic fire extinguishing equipment of the fume hood to actually achieve the fire-proof effect.
It is of course to be understood that the embodiments described herein is merely illustrative of the principles of the invention and that a wide variety of modifications thereto may be effected by persons skilled in the art without departing from the spirit and scope of the invention as set forth in the following claims.
