Abstract: Apparatus for use in aeration of a fluid. The apparatus includes a power unit having a rotatable shaft. An impeller is coupled to the shaft. The impeller has a blade with a generally uniform outside diameter. A diffuser head is positioned proximate the impeller. The impeller may be a screw impeller. The diffuser head may be a stepped diffuser head.

Abstract: High capacity, low cost fractionation trays are formed from a number of adjacent triangular (v-shaped) downcomer modules. The trays are free of the horizontal perforated decking surface of conventional trays. The downcomer modules have perforations only in a bottom region for liquid passage and in an upper region for vapor passage, with the central portion of the two inclined downcomer sidewalls being imperforate. The difference in elevation between the bottom region and upper region is considerably larger than a ripple tray. A layer of packing material may be provided close to or adjacent the bottom surface of the tray.

Abstract: A limiter of the extent of adjustment of a fuel metering needle valve of a carburetor for an internal combustion engine. The limiter has a housing with a passage in which the head end of the needle valve is received and a cap received in the passage on the head end of the valve for rotation in unison with the valve. An arm carried by the body of the cap is engagable with a stop in the passage to limit to less than one complete revolution the extent to which the cap and needle valve can be rotated by an end user to adjust the needle valve. To provide a tamper-resistant limiter, the head of the cap is received in a bore of the housing passage with either only a slight clearance between them or an interference fit which also inhibits rotation of the valve by vibration of the operating engine on which the carburetor and limiter are utilized.

Abstract: A variable Venturi slide includes a beveled edge at an oblique angle to lower surface of the slide and air flow, and an auxiliary hole having an opening on the beveled edge communicating between the air flow and the interior of the variable Venturi slide. By being located on the beveled edge, the opening of the auxiliary hole is effectively kept out of the high velocity low air pressure air stream at lower air velocities during partial throttle conditions. The auxiliary hole bleeds vacuum from the interior of the variable Venturi slide, picked up by the other lift hole located on the bottom of the slide, and slows the slide lift rate. The slide stays down or rises very slowly under conditions in which a conventional prior art slide would be starting to rise at a linear rate. At higher air velocities, when the throttle plate is opened quickly or operated at near wide open conditions, the opening of the auxiliary hole adds vacuum to the interior of the slide, and increases the slide lift rate.

Abstract: A multiple downcomer tray assembly for vapor liquid contact towers. The downcomers are constructed with support baffles enabling the downcomer tray to be supported therefrom. The support baffles include a generally centralized aperture formed therethrough. An active bridge is disposed between adjacent, end to end downcomers for equalization of liquid flow upon the tray.

Abstract: A mixing head to be mounted on a utilization system is operable to mix media and to then supply the mixed media to the utilization system. The mixing head includes a housing having an inlet end and an outlet end. The outlet end has an annular flange to enable the housing to be mounted on the utilization system. A rotor is mounted within the housing for rotation about an axis. The rotor includes an upstream axial flow impeller and a downstream radial flow impeller. Each impeller includes plural rigid and fixed blades. At the outlet end of the housing is an outlet in the form of an annular gap to supply mixed media from the housing into the utilization system. A deflection hood is mounted at the outlet end of the housing. The annular gap is positioned radially outwardly of the hood. The hood has an outer surface that is directed away from the housing and that has a convex shape.

Abstract: A mist generating, self-contained room air humidifier ensures substantially complete evaporation of the mist introduced to an air flow drawn from a room environment prior to discharge back into the room by preferably providing a vertical column extending upwardly from the mist generator to the humidifier outlet and having sufficient height to allow complete evaporation.

Abstract: A crankcase fuel injection system includes a diaphragm type fuel pump, a crankcase fuel injector assembly, and a main air inlet assembly. Engine crankcase pulses generated by the up and down movements of the piston are utilized by the fuel pump to replenish the fuel mixture in a fuel mixture injector chamber of the fuel injector assembly. The air mass entering the crankcase upon the upstroke of the piston is controlled within the main air inlet assembly by a throttle valve and metered across a main air venturi. The venturi signal at the main air venturi is amplified by a booster venturi. The amplified venturi signal is applied to a middle chamber formed between the two diaphragms of the compound diaphragm assembly which serves as the injector pump mechanism. The force acting upon the diaphragm assembly due to the amplified venturi signal is further amplified due to the area relationships of the two diaphragms.

Abstract: A heat and/or mass exchange structure which includes a shell having an outer vertical wall with an interior surface, a plurality of first corrugated packing sheets having an outer edge that is spaced away from the interior surface of the shell, and a plurality of second corrugated packing sheets positioned within the shell and sandwiched between a pair of the first corrugated packing sheets.

Abstract: Described is an air freshener unit comprising a container, a disc-shaped cartridge of air freshening material rotatably mounted about a horizontal axis within the container, and a discharge outlet in the wall of the container to allow the air freshening vapor to be dispensed. The container has baffle means adapted to allow a faster rate of evaporation of the air freshening material in one part of the cartridge relative to the remainder of the cartridge. The quicker rate of evaporation of the offset part causes the center of gravity to self-rotate within the container. The disc-shaped cartridge comprises a holder having a hub portion for rotatably mounting the cartridge in the container and holding means for supporting air freshening material in block form uniformly around the hub portion. The hub portion has oppositely directed stub shafts for location in apertures in opposed walls of the container, the apertures allowing the cartridge to rotate.

Abstract: A carburetor fuel adjusting device that facilitates control of the quantity of fuel that flows from the fuel chamber to an air intake port of a carburetor by making it possible for the user to adjust an adjustment valve within the limits defined by emission control regulations. The carburetor fuel adjusting device has a cap having two appendages to limit its turning in the lean mixture direction and in the rich mixture direction, and an engagement area to engage a valve extension of the fuel adjustment valves of a carburetor. The valve extensions are inserted through insertion holes of a retainer attached to the carburetor body. When the cap is retained by the retainer in a disengaged position, wherein the engagement area is not attached to the valve extensions of the fuel adjustment valves, the adjustment valves can be adjusted separately from the cap. The cap, however, can be moved forward to an engaged position wherein the engagement area of the cap becomes attached to the valve extensions.

Abstract: A portable working tool such as a motor chainsaw has a housing and an internal combustion engine with a carburetor contained in the housing. A throttle valve is connected to the carburetor. A choke flap is connected to the carburetor upstream of the throttle valve in the flow direction of the combustion air into the carburetor. An operating member is connected to the choke flap. A choke flange is connected to the carburetor at a side of the carburetor at which the choke flap is arranged. A suction member for the combustion air is connected to the choke flange. The choke flange has a receiving element for the operating member. A lever is fixedly connected to the choke flange. The operating member has a first end extending through the housing to the exterior and a second end engaging the lever. An actuating button is connected to the first end.

Abstract: An adjustable fuel metering adapter for a carburetor includes a rectangular plate having an inlet surface and an opposite outlet surface. A needle valve chamber with a needle valve seat is formed within the plate and communicates with a threaded needle valve bore formed through a top edge surface of the plate. A pair of inlet ports are bored into the inlet surface of the plate, and a pair of outlet ports are bored into the outlet surface of the plate. A pair of inlet passages communicate respectively between the inlet ports and the needle valve chamber. A pair of outlet passages communicate between the needle valve chamber and the respective outlet ports. The inlet ports receive fuel from the fuel bowl of the carburetor, and the outlet ports are positioned to align with fuel supply passages of the carburetor. Rotation of a needle valve member received in the needle valve bore simultaneously controls the volume rate of fuel flow from the fuel bowl to the respective fuel outlet ports.

Abstract: A humidifier reduces the noise generated by the dropping of water droplets and can also vent bacteria-destroyed mist. An auxiliary water tank is installed under a water supply tank for receiving the water supplied from the water supply tank. An ultrasonic humidifying vessel is connected to the auxiliary water tank. A heating-type humidifying apparatus is provided at the upper portion of the ultrasonic humidifying vessel. A heating coil is wound around a driving pulley of the heating-type humidifying apparatus. First and second idle pulleys are immersed in the water contained in the ultrasonic humidifying vessel. A humidifying endless belt trains around the driving, the first idle, and the second idle pulleys.

Abstract: A water aerator is provided that has a rigid support plate that in the operating position is disposed essentially horizontally. The support plate has a practically planar upper surface and at least one aperture for air. An elastic plate of elastomeric material is disposed on the upper surface of the support plate. The elastic plate is provided with a plurality of fine slits that can be widened by air that is introduced between the support plate and the elastic plate. The elastic plate has a rim that sealingly surrounds the downwardly directed rim of the support plate to be secured thereto in a hook-type manner.

Abstract: This invention provides a means of achieving the close control of iodine flow rate, temperature of the resulting combined gaseous mixture of iodine in diluent gas, as well as the rapid start and stop response time needed for full-scale laser operation. It comprises an iodine charge stored as a solid and is heated to converted the iodine to a liquid, a means to heat the iodine under pressure to extend the liquid temperature range of iodine, an atomizer for complete vaporization of the iodine, a helium iodine mixer to provide heat for iodine vaporization purporting iodine to helium proportion mass ratio and provides for complete mixing and a flow control system which controls the low iodine flow rates accurately.

Abstract: An aeration system for a wastewater treatment plant includes an air supply pipe for receiving compressed air. The air supply pipe has a plurality of outlets. A flexible air supply conduit extends from each outlet to an elongate aerator having ends. An end fitting is connected to the aerator at each end thereof, with walls in each end fitting defining an attachment location. A guide member is provided for each end fitting, each guide member having lower and upper ends, and the guide member being loosely interfitted with the attachment location of the end fitting to permit relative movement between the aerator and guide member. The lower end of the guide member is fixed with respect to the bottom of the wastewater treatment basin. The upper end of the guide member is attached to a stop member.

Abstract: A distributor for supplying a mixed phase flow of gas-liquid feed uniformly on the surface of a trickle-bed of solid particles, including a tray horizontally arranged above the surface of the trickle-bed. The tray is equipped with a plurality of open-ended tubular distributor downcomers of a predetermined tube diameter and extend vertically for a certain height above and below the tray. The downcomers are adapted to provide passage for liquid flow through horizontal aperture in the tube wall of the downcomers and to provide passage for gas flow through the open ends of the downcomers. The apertures are disposed in the tube walls at various elevations above the tray with a predetermined minimum elevation for maintaining a liquid level on the tray.

Abstract: An evaporative humidifier includes a base having a portion defining a reservoir for holding a quantity of water. A housing is mounted on the base over the reservoir, the housing having an air inlet and an air outlet. A cylindrically shaped wick filter is seated in the reservoir and extends up into the housing, the cylindrically shaped wick filter having an open top end and a sidewall. A fan is mounted inside the housing for drawing air into the housing through the air inlet, then into the center of the cylindrically shaped wick filter through the open top end, then out through the sidewall of the cylindrically shaped wick filter and then out of the housing through the air outlet. A heater is also mounted inside the housing for heating the air drawn into the housing prior to passage through the cylindrically shaped wick filter.

Abstract: A temperature compensated carburetor including a composite valve member comprising a bi-metal strip and a gate valve needle for varying the effective flow cross-sectional area of the main and/or idle fuel supply duct to modulate the flow rate of fuel to the carburetor venturi mixing passage. The bi-metal strip generates substantially all of temperature-change-induced movement of the valve needle. The needle may be made of brass or aluminum, or alternatively of plastic material having a much greater coefficient of expansion than the aluminum carburetor body in which it is adjustable mounted such that differential linear expansion and contraction of the valve needle itself, as well as that of the bi-metal, relative to the carburetor body in response to ambient temperature changes varies the flow-controlling cross-sectional area of the fuel duct inversely relative to ambient temperature changes. A needle cylindrical mounting portion at one end is threadably secured in the strip movable free end.