Abstract: A method and apparatus for slitting ribbon stock for use in making fins for a heat exchanger. A pair of slitter wheels are mounted to co-act on separate shafts. One of the shafts is driven by a motor and the other shaft is driven therefrom. Notched pulleys mounted on each shaft and a double sided belt connects the pulleys to maintain the slitter teeth and respective wheels in registration during rotation. A phase shifting device is further provided to allow for initial alignment of the slitter teeth relative to the pulleys.

Abstract: This invention relates to a method and apparatus for shutting down a combustion system when a pressure greater than atmospheric pressure is present in the flue pipe of the system. The apparatus comprises a connector means for connecting the flue pipe of the system with the surrounding atmosphere and a thermal switch which is in thermal contact with and responds to the gases within the connector means. The apparatus is especially useful as a safety device for shutting down an induced draft combustion system when the flue pipe of the system is blocked. Also, the apparatus can be used with a combustion system having a flue outlet vent which is also used as the outlet vent for another combustion system.

Abstract: The load on the starting steam turbine or motor which drives the power recovery string of an FCC process is reduced on the order of 15% by increasing the specific volume of the air compressed by a fixed volume compressor in the string. The specific volume of the ambient air is increased by returning a portion of the compressed and thereby heated air to the inlet of the compressor in amounts sufficient to raise the temperature of the inlet air about 75.degree. F., or more.

Abstract: A motor-compressor unit comprising a compressor including a rotatable crankshaft, a motor, a shell enclosing the compressor and the motor, a supply of lubricant, and a lubrication system for circulating lubricant through the compressor. The lubrication system includes a first stage axial passage, a second stage axial passage extending upward from an upper portion of the first stage axial passage, a first stage radial passage extending outward from the first stage axial passage, and a second stage radial passage extending outward from the second stage axial passage. The lubrication system further comprises an interstage collection chamber for receiving lubricant directed through the first stage radial passage, and an interstage conduit for conducting lubricant from the interstage collection chamber into the second stage axial passage.

Abstract: A rotor assembly and methods for securing rotor blades within and removing rotor blades from rotor assemblies. The rotor assembly comprises a rotor disc defining a plurality of blade grooves, and including a plurality of tenons disposed between the blade grooves and defining a plurality of pin sockets radially extending inward from outside surfaces of the tenons; and a plurality of rotor blades, each blade including a root disposed within a blade groove to secure the blade against radial movement, and a blade platform overlaying a tenon and defining a radially extending pin aperture. The rotor assembly further comprises a plurality of locking pins radially extending through the pin apertures and into the pin sockets to secure the rotor blades against axial movement, each pin including a head and a base to limit radial movement of the pin.

Abstract: A suspension system for a motor compressor unit mounted within a hermetically sealed shell. The shell defines at least one chamber filled with refrigerant suction gas and a second chamber filled with refrigerant discharge gas. The compressor's cylinder block includes a wall member extending into contact with the interior surface of the shell to support the unit in a vertical plane taken through the shell.

Abstract: A control system for operating a vapor compression refrigeration system to prevent oil pump cavitation during startup of the refrigeration system is disclosed. The control system includes a differential pressure switch which is connected on one side to a reservoir which is in fluidic communication with the refrigeration system evaporator or compressor suction line. The pressure switch is connected on its other side directly to the evaporator or compressor suction line. In operation, the reservoir fills with vaporous refrigerant from the refrigeration system when the refrigeration system is shut down and the vaporous refrigerant flows through a restrictor valve back to the refrigeration system at startup of the refrigeration system. The size of the reservoir and restrictor valve are selected so that the differential pressure switch is activated and a control is generated when too rapid a decrease in evaporator or compressor suction line pressure is detected.

Abstract: A method and apparatus for proving a demand for air conditioning or heating upon startup of an air conditioning unit before the unit is allowed to effect heat transfer. A separate thermal sensing unit is provided in the return air to prove a demand for cooling prior to the conventional thermostat of the unit being energized to operate the unit in the normal manner. This method and apparatus prevents energy waste and unnecessary cycling at startup and low load conditions.

Abstract: A vent cap having a quick release fastener for connecting the vent cap to a flue pipe of a furnace or other such combustion system is disclosed. The fastener is designed for attachment to a tubular stub connector of the vent cap and has a clip portion for engaging a slot in the flue pipe to lock the vent cap and flue pipe tigether between the clip portion and a shoulder portion of the fastener. The vent cap is easily disconnected from the flue pipe by rotating the vent cap about the longitudinal axis of the flue pipe to remove the clip portion of the fastener from the slot in the flue pipe and then, pulling the vent cap apart from the flue pipe.

Abstract: An oil slinger is held in place on a shaft by an O-ring which serves as a detent when the shaft is at rest and as a static seal when the shaft is rotating. Because the slinger is held only by a detent action in the rest position, the slinger can be moved aside during assembly and disassembly of the companion bearing and seal structure and thereby provide greater access.

Abstract: Apparatus and a method for inserting tube supports into a loose coil bundle are disclosed. A tube support insertion machine is disclosed wherein a series of spaced support arms are located within a cylindrical coil bundle. A drive is provided for forcing the support arms outwardly, each support arm having a tube support mounted thereto such that the tube supports are forced through the coil bundle securing each of the loops of the bundle in the appropriate location. A tube support for securing the coil bundle prior to the tube sheet insertion and a drive for co-ordinately driving the various support arms with equal force are further disclosed.

Abstract: A motor compressor unit comprising a compressor, a motor, a shell enclosing the compressor and the motor, a motor cap located within the shell, covering a portion of the motor, and defining an attenuation tube opening, and an attenuation tube connected to the motor cap and extending through the attenuation tube opening. The attenuation tube includes a body; first and second lower lips extending outward from the body, below and in pressure contact with an outside surface of the motor cap, first and second alignment flange portions projecting above the first and second lower lips, adjacent opposed surfaces of the motor cap defining the attenuation tube opening; said first and second upper lips extending outward from the body, above and in pressure contact with an inside surface of the motor cap.

Abstract: A hermetically sealed reciprocating motor compressor unit including a sealed shell. Discharge gas from the compressor is passed through the motor via suitable flow passages. The top of the motor and the interior surface of the shell define a chamber therebetween. The rotor functions as a centrifuge for separating the high pressure refrigerant gas from oil entrained therein. A substantially oil free vortex is formed encompassing a sector of the chamber defined by sides bearing 45.degree. relative to the vertical center line of the rotor. A refrigerant gas discharge tube connected to the top of the shell is located at any position which falls within the sector defining the vortex.

Abstract: A heat pump system comprising a compressor, two heat exchangers, and an expansion device. The expansion device defines two, spaced apart flow passages. A first piston is located in a first flow passage for metering refrigerant flow therethrough at a first flow rate, and a second piston is located in the second flow passage for metering refrigerant flow therethrough at a second flow rate less than the first flow rate. The expansion device includes a valve having a first position, closing the second flow passage to direct refrigerant through the first flow passage, and a second position, closing the first flow passage to direct refrigerant through the second flow passage.

Abstract: An electrical connector comprising a plug, a socket, and a switching mechanism. The plug includes a plurality of outwardly extending blades defining parallel blade axes, and the socket defines a plurality of receptacles for receiving the blades. The socket has two longitudinally spaced positions for forming two different electrically conductive circuits with the plug. The switching mechanism is provided for moving the socket along the blades axes away from the first socket position, then along the longitudinal axis of the plug, and then back along the blade axes toward and into the second socket position.

Abstract: A heat exchange unit for use with an air conditioning system having an enclosure defining an opening, a heat exchanger within the enclosure and a grille adapted mounted to the enclosure at the opening, the grille having segments extending between a solid center portion of the grille and an edge portion such that slots are created between adjacent segments. A fan motor is suspended from the center of the grille and a special louver segment is created extending from the fan motor to the edge portion. This louver segment includes inclined segments which coact with a wire guide for forming a wire securing cavity extending from the fan motor to the control section of the unit. This combination louver configuration and wire guide acts to secure the wire in a preselected position.

Abstract: A permanent magnet rotor comprising a housing defining a central rotor axis, an inner ring secured within the housing and annularly extending around the rotor axis, a plurality of permanent magnets supported within the housing and annularly spaced around the inner ring, and an outer ring secured within the housing, annularly extending around the permanent magnets, and including a plurality of outer ring segments. The rotor further comprises filler material filling spaces between adjacent permanent magnets and adjacent outer ring segments; and a plurality of damper plates located radially outside the filler material, engaging the housing, and engaging and extending between adjacent outer ring segments.

Abstract: In a fluid catalytic cracking process in the case of a catalyst load dump the catalyst-laden gas is prevented from passing through the power recover expander. This is achieved by establishing a tangential, low pressure bypass flow path in the supply line to the expander which causes the catalyst to be bypassed. An optical sensor senses the catalyst load dump and causes the actuation of the valve necessary to establish the low pressure bypass flow path.

Abstract: A turbomachine lubricating oil system comprising a casing having a relatively large diameter member rotatably mounted therein with a chamber defined thereby. A support for said casing includes a generally hollow structural member defining a quiescent plenum. Lubricating oil flows from said casing chamber to the quiescent plenum. Oil flows from the quiescent plenum to a lubricating oil reservoir.

Abstract: A wire guide assembly for use in an air conditioning system having a heat exchange unit. A wire guide assembly acts to provide a secure cavity through which wires emanating from the control area and flowing to a separately located electrical component may pass. The wire guide assembly serves to protect the wires from engagement with either a rotating fan or a heat exchanger. The wire guide assembly includes a control area member having a T-shaped opening, a retainer and a cover slidably engaged to the retainer.