Hitachi Industrial Equipment Systems Co., Ltd.

Hitachi, Ltd.

Keiichi Ono

Hirotoshi Sato

Makoto Yokoyama

Fumiyuki Tamura

Tomoyuki Suzuki

Tomotaka Kodama

Provided is a safety cabinet that prevents oversights in airtightness tests and HEPA filter penetration ratio tests even if a pathogen or the like leaks from a workspace wall surface in the interior of the safety cabinet. The safety cabinet includes: a work surface at the bottom of a workspace; a front panel at the front of the workspace; a work opening section below the front panel; and a first air purification means that filters exhaust air that is air discharged from within the workspace. The safety cabinet is characterized in that the non-workspace sides of a side wall surface and a back wall surface of the workspace are formed by an outer wall of a device with prescribed airtightness performance.

Safety cabinet

An isolation device for supplying a workspace with clean air resulting from dust filtration by an air cleaning means accurately manages the number of fine particles in a workspace and prevents fine particles from mixing with an experimental material. The isolation device includes a measurement probe; a particle counter for measuring the fine-particle counts for a plurality of particle sizes in the workspace air and outputting the measurements; a storage unit for storing, for each of the plurality of particle sizes and for work times and non-work times, management fine-particle counts at which the number of fine particles per unit volume is determined to be large; a cleanliness determination unit that compares the fine particle counts and the management fine-particle counts; and an output unit for outputting an alarm when the work-time/non-work time fine particle count for a particle size in the workspace exceeds the corresponding management fine-particle count.

Isolation device with built-in particle counter

With respect to a clean air device, in order to provide a device structure and an air cleaning unit inspecting method capable of supplying clean air through a filter and also capable of measuring the amount of dust in a workroom space in which blown air forms a laminar flow such that an increase in the amount of dust can be accurately detected, the clean air device comprises an air cleaning unit, a rectifying unit arranged downstream of the air cleaning unit configured to rectify air blown from the air cleaning unit and form a laminar flow, and a workroom arranged downstream of the rectifying unit, wherein at least one suction port is provided on a wall surface in a space formed between the air cleaning unit and the rectifying unit, configured to draw out the air in the space to an exterior.

Clean air device and air cleaning unit inspecting method

The workability of operation to be performed, while preventing chemical or biological contamination, using a biosafety cabinet and gloves attached to the cabinet is improved. A biosafety cabinet includes a workspace formed in a main body cabinet thereof. Air in the workspace is discharged to outside via filters. A vertically movable front shutter is disposed on a front of the workspace. A front opening is formed below the front shutter to be at a front of the workspace. The front shutter includes plural laterally movable small windows which are overlapped like layered sliding doors. One of the plural small windows is provided, on the workspace side thereof, with a pair of glove ports to which a pair of gloves for use in operation in the workspace can be air-tightly attached.

Biosafety cabinetry

A safety cabinet adaptable for a variation in body height of a worker using the safety cabinet, that is, a safety cabinet which prevents various bacteria from proceeding from the outside of the safety cabinet into a working space of the safety cabinet and prevents bacteria or virus from proceeding from the working space to the outside of the safety cabinet irrespective of a change in opening area of a front opening, is provided. A flow velocity of a clean air supplied into the working space and a flow velocity of the air flowing through the front opening are set at respective velocities predetermined to keep a physical isolation for preventing the contamination in accordance with a size of the front opening. Further, in the safety cabinet, the size of the front opening communicating with the working space under the front surface shutter is adjustable between 200 mm and 300 m.

A safety cabinet can adapt to variations in body height of a worker or user. The safety cabinet prevents various bacteria from proceeding from the outside of the safety cabinet into a working space of the safety cabinet and prevents bacteria or viruses from proceeding from the working space to the outside of the safety cabinet irrespective of a change in opening area of a front opening. A flow velocity of clean air supplied into the working space and a flow velocity of the air flowing through the front opening are set in accordance with a size of the front opening to maintain physical isolation and prevent contamination. The size of the front opening of the safety cabinet is adjustable.

A safety cabinet which can prevent contaminated air from leaking from a working space through the periphery of a front shutter, and which can prevent outside air from entering the working space has a peripheral structure part surrounding the working space formed with air suction ports in a part opposed to the inner surface of the front shutter connected to a negative pressure passage formed outside of the working space. The negative pressure passage guides air sucked through the air suction ports from the inside and the outside of the working space, toward a filter for purification of the air.

Safety cabinet for antibiohazard

Information from fan filter units and differential pressure gauges provided in a ceiling of a clean room is used to control directions and volumes of air flows blown from respective fan filter units. In order to improve a wind velocity distribution in the clean room, pressure in a ceiling chamber is made uniform and control of the FFU revolution speeds of fan filter units is made easy. In order to control directions of air flows in the clean room, damper adjusting mechanisms are provided under a grating floor of the clean room. Such arrangement enables optimizing an operating condition of the clean room and achieving energy saving.

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Tainai, Japan

Keiichi Ono