Light responsive activating apparatus for fire or explosion suppressing systems
阅读：735发布：2023-05-16
专利汇可以提供Light responsive activating apparatus for fire or explosion suppressing systems专利检索，专利查询，专利分析的服务。并且A deluge type fire and explosion suppressing system is provided employing improved light sensing means in the nature of a photomultiplier tube having internal amplification properties and improved control and actuating circuitry for the deluge material releasing mechanism which is substantially immune to the effects of electrical transients of either polarity.，下面是Light responsive activating apparatus for fire or explosion suppressing systems专利的具体信息内容。
1. In apparatus for suppressing fire or explosion within a predetermined space: electrically actuatable means disposed and adapted, when actuated, for quickly suppressing a fire or explosion commencing in said space; electrically controllable first and second electricAl switching means each having control means associated therewith for altering the functional state of the corresponding switching means between a circuit-interrupting condition and a circuitcompleting condition in response to electrical control voltages applied to said control means; electrical actuating circuit means coupled with said suppressing means and having said first and second switching means coupled therein for actuating said actuable means whenever both of said switching means are in their circuit-completing conditions; means for supplying electrical power from which said control voltages may be derived, said power sometimes including possible electrical transient components; standby condition maintaining means coupling said supplying means with said control means of each of said switching means for normally providing and applying to the latter control voltages for maintaining said first switching means in its circuit-interrupting condition and said second switching means in its circuit-completing condition; sensing means for sensing the commencement of a fire or explosion within said space substantially simultaneously with the initial occurrence thereof and for producing an immediate electrical output signal in response thereto; operating means for coupling said sensing means with said control means associated with said first switching means and operable in response to the production of said output signal by said sensing means to apply to said control means associated with said first switching means an alternate control voltage for altering the functional state of said first switching means to the circuit-completing condition thereof; and primary transient protective means coupled with said supplying means and said control means of said second switching means for sensing certain electrical transients in said power and for providing and applying to said control means of said second switching means in response thereto an alternate control voltage for altering the functional state of said second switching means to the circuit-interrupting condition thereof during the duration of occurrence in said power of said transients.
2. Apparatus as set forth in claim 1, wherein said primary protective means responds to electrical transients of that electrical polarity which effectively apply to said control means of said first switching means a voltage simulating said alternate control voltage applied thereto by said operating means when commencement of a fire or explosion is sensed by said sensing means.
3. Apparatus as set forth in claim 2, wherein is provided secondary protective means coupled with said supplying means and said standby condition maintaining means for shunting electrical transients of the opposite electrical polarity away from said control means of said second switching means.
4. Apparatus as set forth in claim 2, wherein is provided auxiliary protective means coupled with said supplying means and said standby condition maintaining means for shunting electrical transients of said opposite electrical polarity away from said control means of said first switching means.
5. Apparatus as set forth in claim 1, wherein said sensing means includes a photomultiplier tube.
6. Apparatus as set forth in claim 1, wherein said actuatable means includes a supply of suppressant material under pressure, conduit means leading from said supply to said space, a normally closed valve interposed in said conduit means, and an electrically actuatable detonator associated with said valve for opening the latter.
7. Apparatus as set forth in claim 1, wherein each of said switching means comprises a silicon controlled rectifier having a control element.
8. Apparatus as set forth in claim 1, wherein said operating means includes electrical circuitry coupled with and deriving power from said supplying means.
9. Apparatus as set forth in claim 1, wherein said sensing means comprises a photomultiplier tube which produces a negative sEnse output signal when light in said space is sensed; said first switching means comprises a silicon controlled rectifier having a control element; said maintaining means normally applies to said element a voltage which is insufficiently positive to switch said rectifier into its conductive state; and said operating means includes an active device having an input circuit coupled with said sensing means and said supplying means, and an output circuit coupled with said supplying means and said element, said device producing an amplified control voltage signal of positive polarity for application to said element of said rectifier to switch the latter to its conductive state when said output signal is applied to said device from said sensing means.
10. Apparatus as set forth in claim 9, wherein said second switching means comprises a second silicon controlled rectifier having a control element; said maintaining means includes voltage dividing means coupled with said supplying means and said last-mentioned element for normally applying a positive polarity bias to the latter for keeping said second rectifier switched into its conductive state; and said primary protective means includes capacitative impedance means coupled with supplying means and said last-mentioned element for applying to the latter a transient of negative polarity appearing in the power being supplied by said supplying means for offsetting said bias sufficiently to switch said second rectifier into its non-conductive state during the duration of said negative transient.
11. Apparatus as set forth in claim 10, wherein is provided means including said impedance means and a unidirectionally conductive device coupled across said supplying means for shunting positive transients appearing in the power being supplied by said supplying means away from the control element of said second rectifier.
12. Apparatus as set forth in claim 11, wherein is provided means including a second active device having an input circuit coupled across said supplying means and an output circuit coupled across the output circuit of said first-mentioned active device, said second active device normally being biased into a non-conductive state but being responsive to a transient of positive polarity appearing across its input circuit to switch said second active device into its conductive state for shunting said positive transient across the output circuit of said first-mentioned active device to prevent its imposition upon the control element of said first rectifier.
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