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Circuit for ventilating and filtering the medium contained in a confinement enclosure
| Details |
Inventors: Picard, Claude; Saint Martin, Bernard;
Assignee: La Calhene (Bezons, FR)
Primary Examiner: Nozick; Bernard
Assistant Examiner:
Attorney, Agent or Firm: Kerkam, Stowell, Kondracki & Clarke
The invention relates to a circuit for ventilating and filtering the medium contained in a confinement enclosure (10) and also a method for sterilizing such an enclosure and its supply and discharge filters. An emergency or standby circuit is associated with the circuit ensuring ventilation and filtration under normal operating conditions and which comprises a supply pipe (20) and a discharge pipe (12), equipped with a suction fan (14). The said emergency circuit comprises the same pipes used in the opposite direction under the action of a suction fan (28) located in supply pipe (20), whereby said fan (28) can be automatically controlled by a pressostat (30). Sterilization is performed chemically, using a sterilizer which is connected to the supply duct between a valve and the supply filters disposed downstream of the valve. The sterilizer delivers a sterilizing agent which passes successively through the supply filters, the enclosure and the discharge filters. Once sterilization has been performed, the ventilating circuit is started up, so as to sweep away the sterilizing agent. Application to biological or nuclear experimentation enclosures. |
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DETAILED DESCRIPTION We claim: 1.
A process for establishing and maintaining a vacuum within a ventilated and filtered air tight enclosure, said process comprising: introducing a filtered medium into the enclosure through a supply pipe having a first filtering means in the supply pipe; establishing a vacuum in the enclosure by employing an enclosure discharge pipe which discharges the medium from the enclosure in a normal flow direction and which is connected to a means for establishing the vacuum, the discharge pipe having a second filtering means, and by regulating the flow rate in the supply pipe; and maintaining the vacuum in the enclosure in the event of a failure by sensing the pressure within the enclosure and actuating a means for maintaining the vacuum upon a predetermined rise in pressure within the enclosure; the means for maintaining the vacuum being connected to the supply pipe upstream of the first filtering means and operable to reverse the flow of the medium in the supply pipe.
2.
A process in accordance with claim 1, which further comprises sterilizing the enclosure by the steps of: providing a valve means in the supply pipe upstream of the first filtering means; connecting a chemical sterilizer to the supply pipe between the valve means and the first filtering means; closing the valve means; operating the means for establishing the vacuum within the enclosure; operating the sterilizer for supplying saturating vapors of a sterilizing chemical agent successively to the supply pipe, including the first filtering means to the air tight enclosure and to the discharge pipe, including the second filtering means; stopping the sterilizer after a given period of time; opening the valve means; and pursuing operation of the means for establishing the vacuum within the enclosure to sweep the saturating vapors of the sterilizing chemical agent.
3.
A process in accordance with claim 2, wherein the step of closing the valve means follows the following steps: dismounting the first and second filtering means; washing inner surfaces of the walls of said enclosure and said filtering means with a solution comprising said sterilizing chemical agent and a wetting agent; rinsing said inner surfaces and said filtering means; drying said inner surfaces and said filtering means; and assembling the first and second filtering means
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Molecular Biology 
