Abstract: Apparatus for encasing a heat exchange unit. A wrapper is disclosed having solid portions for structural support of the heat exchange unit and fastening means including closure means formed on each end of the wrapper and a fastener strip which co-acts with said closure means to secure the wrapper in its appropriate position. Louver portions and solid portions of the wrapper are additionally disclosed to provide a structurally sound wrapper having spaced louver openings to allow air flow therethrough.

Abstract: An engine-driven refrigeration unit includes a first heat exchanger functioning alternatively as a refrigerant condenser or as a refrigerant evaporator. When the heat exchanger is functioning as a refrigerant evaporator the heat transfer medium furnished thereto for providing a source of heat to vaporize the refrigerant is preheated by absorbing heat from a relatively warm fluid employed as the cooling medium for the engine driving the refrigeration unit.

Abstract: A trip mechanism for use with a rotatable shaft comprising a Belleville spring encircling the shaft, a pair of collars secured to the shaft for mounting the spring thereon and engaging the spring to transmit rotary motion from the shaft to the Belleville spring, and a plurality of weights connected to the spring. The spring includes a reinforcing band portion annularly extending therearound, and the Belleville spring and weights are so proportioned that the spring will snap overcenter when the rotational speed of the shaft exceeds a preset value and will snap back overcenter toward an unstressed position when the rotational speed of the shaft is reduced.

Abstract: Apparatus for mounting a door for pivotal movement in an air conditioning unit. This door has as a portion thereof a pivot assembly having a series of contact surfaces which engage a series of surfaces of a top support so that the door may be rotated relative to the top support. The entire mechanism is formed of two components which, when assembled, provide a rotational mechanism hidden from view. An over center pressure applying means to secure the door in the fully open position is additionally disclosed.

Abstract: Apparatus and method for defrosting a dual refrigeration circuit refrigeration system. During defrost one of the refrigeration circuits is operated to supply heat energy to the frosted heat exchanger of the other circuit and the fan circulating heat transfer media through a heat exchanger of each circuit is reversed such that heat transfer fluid is heated by one refrigeration circuit and then used to defrost a heat exchanger of the other circuit.

Abstract: An absorption refrigeration system having a generator that includes a first, or primary, heat exchanger operatively connected to a low temperature energy source and that includes a second, or auxiliary, heat exchanger operatively connected to a high temperature energy source. Control means are provided so that energy is supplied to the generator from the high temperature energy source only after energy is extracted from the low temperature energy source and additional energy is required by the system. Various embodiments are disclosed showing different ways of positioning and operating the primary and auxiliary heat exchangers. Another embodiment illustrates a condenser system that efficiently operates to condense refrigerant vapor regardless of the distribution of the energy contribution between the high and low energy sources.

Abstract: A bearing and lubrication system for a rotatable shaft comprising a journal bearing assembly for supporting the shaft, a thrust bearing assembly for limiting axial movement of the shaft, and a ring surrounding the shaft and having a portion of the inner surface thereof drivingly engaged by the shaft wherein rotation of the shaft causes rotation of the rings. A supply of lubricant is disposed beneath the ring in the path of travel thereof as the ring rotates under the influence of the shaft, wherein rotation of the ring causes lubricant to cling thereto and be elevated thereby. A first portion of the elevated lubricant is introduced to the journal bearing assembly to lubricate surfaces thereof, and a second portion of the elevated lubricant is radially thrown outward by the ring.

Abstract: An erosion probe for monitoring erosion of a component of a turbomachine by fluid flow therepast comprising a shell having a predetermined erosion rate proportional to the erosion rate of the component, and an electric inductance sensor encapsulated secured within the shell for generating an electric signal indicative of shell erosion.

Abstract: Apparatus for securing a front cover to an air conditioning unit is disclosed. This apparatus includes a front cover having pivoting means and including a fastening lip for securing the unit in the closed position and a flange for securing the unit in the service position. An air conditioning unit assembly is additionally provided having a pivot means for coacting with the cover and a control panel extension for securing the flange of the cover to maintain the cover in the service position. A support lip is also provided for coacting with the fastening lip of the cover to maintain same in the closed position.

Abstract: Apparatus and method are disclosed for providing a relatively constant temperature level flow of discharge air from a reverse cycle air conditioning system. Air temperature of the air being discharged from the indoor heat exchanger of the refrigeration circuit is measured and used to control indoor fan speed to maintain the supply air temperature to the enclosure at a relatively constant temperature level. A secondary zone may be provided for receiving conditioned air from the indoor heat exchanger. A damper regulated in response to the leaving air temperature from the indoor heat exchanger is used to control the volume flow rate to the secondary zone such that as the indoor fan speed is decreased the damper decreases the volume flow rate to the secondary zone while maintaining a constant volume flow rate to the primary zone. An outdoor thermostat is provided for operating the indoor fan at normal speeds when the ambient temperature is within a predetermined range.

Abstract: In a central air conditioning system where airflow is regulated by bellows inflation which is controlled by a bleed-type thermostat, a second bleed which is controlled by a regulator is provided to insure a minimum flow for ventilation independent of cooling demand.

Abstract: Apparatus and method for operating a series compression refrigeration system are disclosed. A by-pass for circuiting refrigerant around one compressor when the compressor is not operating is provided. Additionally, a quench conduit conducts liquid refrigerant from a common line to provide a liquid refrigerant quench of the gaseous refrigerant between compressors. A control device is provided for regulating the flow of liquid refrigerant through the quench conduit.

Abstract: A flow control apparatus for use with a heat exchanger having a plurality of heat exchange tubes. The flow control apparatus comprises a housing; and the housing is divided into a first compartment for communication with a first set of heat exchanger tubes, a second compartment for communication with a second set of heat exchange tubes, an inlet compartment for connection to an external fluid source, and an outlet compartment for discharging fluid from the housing. First, second, third, and fourth ports are provided for transmitting fluid between, respectively, the first and outlet compartments, the first and inlet compartments, the second and inlet compartments, and the second and outlet compartments. The flow control apparatus further comprises a flow control gate having a normal flow position directing fluid through the second and fourth ports, and a reverse flow position directing fluid through the first and third ports.

Abstract: A tube end expander and a method of operating the same. The tube end expander comprises a rotatable, tubular cage defining a plurality of generally axially extending slots, and a plurality of rollers located within the cage and extending through the slots. The expander further comprises a rotatable, tapered mandrel axially extending into the cage in frictional, driving contact with inner surfaces of the rollers, and an auxiliary roller drive for transmitting rotary motion from the mandrel to the cage and rollers.

Abstract: A refrigeration machine and a method of charging the same. The machine comprises a compressor, a condenser, an expansion device, and an evaporator connected together to form a closed loop, vapor compression refrigeration circuit. The condenser includes first and second parallel refrigerant condenser coils, and refrigerant is condensed with greater efficiency in the first condenser coil than in the second condenser coil. The refrigeration machine further comprises a first sight glass for disclosing the presence of refrigerant vapor in the refrigerant fluid discharged from the first condenser coil, and a second sight glass for disclosing the presence of refrigerant vapor in the refrigerant fluid discharged from the second condenser coil.

Abstract: A torque control for a fluid operated motor includes a first gear to be driven through operation of the motor and a second gear in driving engagement with said motor and maintained in a generally stationary position during normal operation thereof. The torque control further includes a drive mechanism connected to the first gear and to a load to be rotationally driven through operation of the motor. A valve is provided in the fluid supply to the motor to open and close the supply of fluid thereto. Disconnect means is operatively connected to the second gear and the valve to maintain said valve in an open position to permit supply of fluid to said motor when the second gear is stationary. The second gear rotates when the torque required from the motor to rotate the load exceeds a predetermined magnitude to move the disconnect means relative to the valve to close the valve to terminate the supply of fluid to the motor.

Abstract: A method and apparatus utilizing a hot gas defrost system wherein superheated gas from the system compressor is conducted into a heat exchanger mounted within an accumulator for supplying heat to vaporize liquid refrigerant received from the evaporator. After the gas passes through the heat exchanger it is conducted to the condenser where it is condensed to a liquid and then routed to the evaporator. In the evaporator or frost accumulating coil the liquid refrigerant is subcooled, supplying heat to melt the ice formed on the evaporator surfaces and the liquid is thereafter conducted to the accumulator where the heat supplied from the heat exchanger acts to vaporize the fluid. The vaporized refrigerant is then recycled to the compressor to complete the system.