732 results about "Fume hood" patented technology

A ventless fume hood is integrated with an oven to anticipate a conclusion of the cooking schedule executed by the oven and in this way to provide direct venting of the oven cavity before the oven door is opened. Proper venting of a multimode combination oven may be thereby performed and the door may be opened up immediately upon conclusion of the cooking schedule without the delay otherwise required to collect cooking fumes escaping through the partially open door.

A safety welding cart structure having a metal box for holding pressurized gas cylinders, a firewall separating the cylinders, individual clamping devices to secure the cylinders, and shelves extending from the back of the box forming a cart set upon a four-wheeled base, which includes two positive-locking swivel casters. The regulators are contained within a ventilated cabinet and the hoses are wound about a reel.

Method and apparatus for testing the operation of an alarm for a ventilated enclosure, such as a fume hood or bio-safety cabinet. Flow of gas being exhausted from the enclosure may be adjusted to a known value below or above a threshold value at which the alarm provides an indication that flow is unacceptably low or high. Adjustment of flow to the known value may be performed without requiring a manual measurement of flow, e.g., by performing a traverse in a duct leading from the enclosure.

An air flow monitoring and control system with reduced false alarms includes an alarm sensor for monitoring air flow in a fume hood or the like, set to provide a warning if air flow drops below a predetermined amount. A local controller monitors the alarm, and disables it when the hood is set to reduced air flow, whether by a local timer or by command of a central control system. Optionally, the controller itself can operate a variable speed drive to reduce air flow on a timed basis, and the controller can communicate with facility management through a dialer or the Internet, or can interface with a central control for the facility through a facility bus.

The invention discloses a novel energy-saving environment-friendly numerical-control fume hood of a laboratory. The novel energy-saving environment-friendly numerical-control fume hood comprises a cabinet, a sliding window, a deflector and a numerical control system. The deflector is provided with a plurality of guide holes; air outside the fume hood flows into an inner cavity of the cabinet after the sliding window is opened; and under guiding of the deflector, gas generated in a testing area is exhausted from the guide holes of the deflector. The numerical control system comprises an automatic sliding window controller, a non-contact sliding window controller, a face velocity controller and a system controller. The automatic sliding window controller is used for detecting whether operators work in an operation area in front of the fume hood or not so as to automatically increase or decrease openness of the sliding window. The non-contact sliding window controller is used for the operators to open the sliding window to a required position in a non-contact way. The face velocity controller is used for regulating exhaust rate of the fume hood automatically according to the openness of the sliding window, and sending the exhaust rate and running states of the fume hood to the system controller so as to regulate running frequencies of an exhaust fan and an air supplement fan.

The present invention relates generally to an integrated system and method for humidity control and vapor-phase decontamination of laboratory equipment with a multi-component vapor, one component of which is water vapor. The laboratory equipment can be a sealable enclosure such as an incubator, isolator, glove box, clean room, fume hood, safety cabinet, or centrifuge. The carrier gas flow is preferably in a multiple-pass, closed-loop recirculating mode. The humidity control and decontamination can be carried out automatically without user intervention for an indefinite period of time once the system has been installed, the required utilities connected and the desired settings including temperature and humidity level programmed.

The integrated humidity control and decontamination system can be retrofitted onto existing laboratory equipment.

A fume hood exhaust stack system (10) and method utilize a variable speed fan (24) and an exhaust stack (28) having an adjustable cross-sectional area. Toxic exhaust from one or more fume hoods (12) is conveyed through a header (16) to the fan. The fan forces the exhaust through the exhaust stack, and the exhaust is then discharged into the atmosphere at a sufficient velocity and momentum to ensure that the exhaust reaches an environmentally sound altitude. A variable speed drive (36), programmable controller (34), flow signals (26), and static pressure and total pressure signals (20) are utilized to modulate the speed of the fan and the area of the exhaust stack to maintain the desired fan inlet pressure and exhaust velocity.

The invention discloses a CIT ventilation cabinet with temperature-proof smoke-proof and fire-extinguishing functions. A temperature sensor and a smoke sensor are arranged at an air outlet part, are respectively used for detecting the real-time temperature value and the real-time smoke quantity inside a cabinet body and are respectively connected to a controller, the controller is used for controlling the rotating speed of a fan according to detection signals of the temperature sensor and the smoke sensor, a flame detector is arranged inside the cabinet body, is used for detecting flame light signals inside the cabinet body and is connected to the controller, a fire extinguishing device is arranged at the side part of the cabinet body and comprises a plurality of spraying mechanisms and a water supply mechanism, the spraying mechanisms are connected with the water supply mechanism through a pipeline, in addition, a control valve is arranged on the pipeline, and the controller is connected with the control valve and is used for controlling the work state of a warning device and the fire extinguishing device according to the detection results of the flame detector. According to the CIT ventilation cabinet, the temperature and the smoke in the ventilation cabinet can be precisely monitored and effectively controlled.

A process for removal of ethylene oxide (EO) from ambient air laden with EO is passed through a zeolite-based removal media, which preferrably consists of the acid form of zeolite ZSM-5, herein referred to as “H-ZSM-5.” The process described herein may be applied to many forms, configurations and uses, such as, for example, gas masks, fume hood ventilation filters, cartridge filters, etc. Preferably, the H-ZSM-5 is configured within an apparatus in such a manner that the stream containing EO is brought into sufficient contact with the zeolite to remove the EO from the airstream.

The invention belongs to the technical field of separating operation and heating engineering, and in particular relates to a converter coal gas dry-method bag-type dust collecting and waste heat recovery method which is characterized in that: dusty high-temperature converter coal gas from a converter passes through a movable fume hood and an evaporation cooling duct to enter in a rough de-dustingfacility, and then the coal gas carries out dust removal and temperature reduction by a heat pipe exchanger and a dry-method bag-type dust collecting device, the coal gas which carry out dust removaland temperature reduction is treated differently according to different constituents of the converter coal gas after temperature reduction is carried out by a spraying device and constituent analysisis carried out. The invention can carry out effective recovery utilization to the converter coal gas, and the waste gas of the converter coal gas is fully utilized, thereby achieving energy-saving andenvironmental-protection purposes under the condition of low investment and high efficiency (dust content of the purified dust is less than 5mg/Nm<3>).

Automatic fire extinguishing equipment of a fume hood includes a cabinet having a workbench, a vent pipe, and ventilation equipment. In front of the cabinet is a window panel. Top rim of the workbench has first and second detection elements, and automatic fire extinguishing equipment mechanisms. The ventilation equipment contains a fire damper. When fire occurs at the workbench from experiments, the first detection element detects a fire signal first to issue alarming sound (or alerting flash) promptly, the ventilation equipment shutdowns, with the fire damper closed for closing the vent pipe. When the second detection element detects a smoke or high temperature signal, the window panel is closed, with the automatic fire extinguishing equipment mechanisms activated automatically to terminate flame, thereby preventing thick smoke or flame from channeling into the vent pipe to spread the fire, and preventing the fume hood from starting a cascade of fire.

A low-cost drug compounding system that can practically fit inside of a fume hood or the like is provided. The system can use a single pump operable in forward and reverse directions (or multiple pumps) to compound complex mixtures particularly including those requiring the creation of solutions from dry or powdered ingredients. A wireless link allows operation of the system remotely. In one embodiment, the system uses a disposable mixing tube set that can be discarded after mixing while still attached to the base ingredient containers used for the compounding thereby minimize the chance of personnel exposure.

The present invention relates to a laboratory fume hood, especially a safety cabinet, comprising a working space which is enclosed by a housing and which is closable by an especially movable front window. It comprises a projection apparatus in order to project an image into the working space.

A ductless fumehood system comprising: at least one ductless fumehood comprising a housing; a workspace formed within the housing; a door for selectively closing off the workspace; an air inlet for introducing air into the workspace; a master module for receiving air from the workspace, purging unwanted substances from that air, and then exhausting that filtered air to the ambient room atmosphere; and a slave module for receiving air from the workspace, purging unwanted substances from that air, and then exhausting that filtered air to the ambient room atmosphere; wherein the slave module is in communication with the master module such that the master module central processing unit is capable of (i) controlling the operation of the active elements of the slave module, (ii) detecting a function failure of the slave module, and (iii) activating the master module alarm in the event of a failure within that slave module.

The invention provides a control method of a draught fan for dry dust removal of converter gas, which comprises the following steps: in a phase other than converter oxygen blowing, transmitting a rotation speed percentage set value to a draught fan frequency changer in a fume flow control mode; in a converter oxygen blowing phase, setting an oxygen blowing start time; and when the oxygen blowing time exceeds the oxygen blowing start time, using a pressure PID (proportional-integral-derivative) controller and a fume flow PID controller in a cascade control mode combining fume flow control and converter mouth fume hood micro-differential pressure control, wherein the output quantity of the pressure PID controller is used for compensating for the set value of the fume flow PID controller, and the output value of the fume flow PID controller is used for controlling the rotation speed of the draught fan frequency changer. The method enables the draught fan to be in a good working state, ensures the recovery quantity of converter gas and ensures that the draught fan for dry dust removal of converter gas has high dynamic response, high tracking accuracy and favorable stability.

The invention provides a ventilation cabinet. The ventilation cabinet can comprise a cabinet body 100 with an opening 101 formed in the front side, and can further comprise an air exhausting port 201, an air supplementing channel 301 and a flow guiding plate 400, wherein the air exhausting port 201 is installed on the side, close to the rear, of the top of the cabinet body 100; the air supplementing channel 301 can comprise an air supplementing port 302; the air supplementing port 302 is installed on the lower edge of the opening 101 of the cabinet body; and the flow guiding plate 400 is erected on the rear side of an inner cavity of the cabinet body 100, and is provided with a plurality of through holes 401. Besides, the side wall of the cabinet body 100 is of a hollow structure, and the air supplementing channel 301 is communicated with an air supplementing inlet 303 and the air supplementing port 302 along the side wall. The ventilation cabinet can eliminate potential safety hazards, harmful gas in the cabinet is prevented from overflowing, and meanwhile the ventilation cabinet further has the beneficial effects of being simple in structure and low in manufacturing cost.