Abstract: A local delivery truck 10 is provided with a thermal storage system for cooling the truck for a delivery run after the system has been charged during periods of off-peak power demand. This is done by chilling, with a refrigerant evaporator 32, a first high density fluid 24 such as methyl chloroform and circulating the chilled methyl chloroform from the lower part 22 of the storage container 20 to the surface of a second, lower density fluid 28. the latter is an anti-freeze solution such as water-methyl alcohol, and occupies the upper part 26 of the storage container. The chilling and circulating continues until the anti-freeze solution contains the desired amount of ice and slush which has formed at ever lowering temperatures.

Abstract: A hermetic compressor having an upper portion 12 and a lower portion 16 is provided with a motor 20 in its upper portion with a vertical crankshaft 22 extending down into the lower portion and driving a plurality of pistons 28, 30 in cylinders 24, 26 arranged radially around the crankshaft, each cylinder having a cylinder head 38 radially outwardly of the discharge valve 36, and at least the lowermost cylinder head 38 being provided with a spring-loaded drain valve 44 which opens upon the differential pressure between the inside of the cylinder head and the suction space in the compressor dropping below a given value during periods of non-operation of the compressor to drain an accumulation of liquids in the cylinder head.

Abstract: A transport refrigeration unit is provided with a control box 16 arrangement in which a hard-wired electrically passive assembly of receptacles 23, 24 and electrical terminal strips 25-27, and interconnecting wires 28-30 at the rear wall 18 of the box is arranged to be electrically connected to the interface module 33 through the plugs 39, 40 being received in the passive assembly receptacles, the interface module having both high voltage and low control voltage elements 41-48, the interface module also having a forwardly facing low voltage receptacle 49 which receives the front module 33 plugs 60 at the rear of the front module, the front module having only low control voltage elements 61-63 and a door 73 for the box provided with control switches 75 connected through wiring 76 and plug 78 to receptacle 79 so that all of the electrical elements of the front module and the door are of low control voltage.

Abstract: For a material processing operation having at least one stage requiring heating and at least one stage requiring cooling, heating is provided by a first heat pump 24 and cooling is provided by a second heat pump 26, with two storage tanks of different temperatures 60 and 62 being provided, the second tank 62 serving as a heat sink for the condensing section 42 of the second heat pump, and serving as a heat source for the evaporator section 38 of the first heat pump, the first tank 60 providing a cooler fluid for the condenser section 42 of the second heat pump, and receiving a cooled fluid from the evaporator section 38 of the first heat pump.

Abstract: A nuclear steam generator modularized wrapper assembly comprising at least two separate generally cylindrical wrapper modules with tube support plates therewithin are assembled in stacked relation and joined within the nuclear containment building, the assembled modules then being placed in the shell with the tube apertures in the tube support plates being aligned with the tube apertures in the tube sheet, and a plurality of adjustable spacer means fixed to the outer circumference of the wrapper assembly are provided and are adjusted to vary the width of the space in the annulus between the wrapper and shell at various locations to lock the assembly in place with axial alignment of all of the apertures in the tube support plates and tube sheets.

Abstract: In a flue damper control system, a thermistor 64 responsive to flue temperatures upstream of the damper 12 is incorporated in a trigger circuit for a triac 52 which controls energization and deenergization of the damper motor 17, the damper motor being fully energized only when the flue temperature is below a predetermined value and there is no demand for heat by the thermostat 36.

Abstract: A centrifugal gas compressor having a shrouded rotatable impeller 14 in an impeller chamber 40, and provided with capacity control vanes 30 and a diffuser passage 18 throttle plate 38, is provided with surge control means including a thermistor 50 which senses a temperature rise beyond a predetermined value in the impeller chamber and exterior of the gas flow path through the impeller, and through relay means such as 52, 58 electrically connected to the thermistor 50 operates to change the compressor operation to a nonsurging condition.

Abstract: A heat pump is provided with an outdoor heat exchanger 30 having a main section 30a and a subcooling section 30b, with a circuiting arrangement and distribution and control means including expansion device 48, check valve 54 and lines 52, 56, 58 and 60 connected so that in a cooling mode of operation of the unit the refrigerant flows through the main section and then the subcooling section in series, and in a heating mode of operation the refrigerant flows only through the main section with the subcooling section receiving refrigerant for storage.

Abstract: An outside coil unit for a heat pump is provided which includes a refrigerant coil 16 with a protective grille 26, 28, the vertical edges of the grille being held by posts 30 and 45 which are tilted outwardly at the bottom to accordingly tilt the grille outwardly at the bottom so that ice and frost buildup onthe coil is not impeded in falling off the coil during defrost cycles.

Abstract: A transport refrigeration unit for a transport container in which the refrigeration unit has side-by-side evaporator and condenser compartments 18 and 20 in the upper portion of the exterior frame, with a power compartment 24 extending across the entire width of the lower portion of the unit, the power compartment containing an internal combustion engine 26, a motor-alternator 28 and a refrigerant compressor 30 in in-line relationship, a radiator coil 62 condenser coil 64 being in inclined disposition in the condenser compartment and receiving air therethrough from condenser fan 66, the evaporator coil 72 being inclined in the evaporator compartment and in a disposition in which a portion of the coil projects out of the plane of the rear face of the frame, and a pair of double inlet centrifugal fans 74 are provided in the upper portion of the evaporator compartment to draw air from the upper part of the container and direct it downwardly through the coil 72 back into the container, and separate panels 36 and

Abstract: An impeller and shaft assembly includes an outwardly tapered socket 38 in the rear face of the impeller 12 and into which a frusto-conically shaped extremity 20 seats, the extremity circumferential wall having a plurality of axially extending grooves 42 alternating with intervening lands 44, the socket and extremity being dimensioned and configured so that in the finally seated relation of the parts the land plastically deforms the socket material which has a lower compressive yield strength than the extremity.

Abstract: This invention provides a direct oil return system from the accumulator tank in the refrigerant circuit of a transport refrigeration system to the crankcase of the compressor for returning oil entrained in the refrigerant to the oil sump. A pressure relief valve in the lubricating oil circulating system positively opens under the influence of oil pressure from the positive displacement oil pump whenever the compressor is operating to bleed excess oil from the pump back to the sump. The oil return line from the accumulator tank of the refrigeration system is connected to the valve to enter through another inlet port which opens in response to the pressure relief valve being opened and flows therethrough to another outlet in the valve also in communication with the sump.

Abstract: In the main intended application of the arrangement according to the invention, that is, using a reversible motor compressor in a heat pump in a refrigerating or air conditioning system, it is desirable to insure a delay during reversal of the direction of compressor operation. A control arrangement is provided in which the control system controls the direction of motor operation or compressor capacity in accordance with temperature conditions, the system including control means for effecting operation in a low capacity direction or condition, or alternatively in a high capacity direction or condition in response to one set, and another set, respectively, of temperature conditions and with timer means delaying a restart of the compressor motor for at least a predetermined time in response to a condition of the control means operative to initiate a change in the operating direction or condition of the compressor when it restarts.

Abstract: An improved load balancing control circuit for at least three electric motor-driven centrifugal refrigerant compressors comprises a current transformer secondary 90', 91', 92' and a respective load resistor 93', 95', 97' in series to form the legs of a circuit in which the legs are connected in a delta, each leg having a shorting switch 110', 111', 112' connected across it, and a balancing resistance network including balancing resistors 94', 96', 98' are connected in a wye circuit with the delta circuit.

Abstract: In a device such as a refrigerant compressor provided with a reciprocating piston having a stroke length which can be changed from one value to another in accordance with the direction of rotation of the crankshaft driving a connecting rod, there is provided an arrangement in which the top deadcenter position of the piston can be maintained irrespective of the changes in stroke length by an eccentric ring which has limited rotation on the crankshaft crankpin, and a second eccentric ring encompassing the first eccentric ring and which has limited rotation relative to the encompassing strap end of the connecting rod. With this arrangement, both the throw of the crankpin means and the effective length of the connecting rod are generally concurrently changed inversely when the crankshaft rotates in one direction or alternatively in the other direction.

Abstract: A hermetic reciprocating compressor such as may be used in heat pump applications is provided for dual capacity operation by providing the crankpin of the crankshaft with an eccentric ring rotatably mounted thereon, and with the end of the connecting rod opposite the piston encompassing the outer circumference of the eccentric ring, with means limiting the rotation of the eccentric ring upon the crankpin between one end point and an opposite angularly displaced end point to provide different values of eccentricity depending upon which end point the eccentric ring is rotated to upon the crankpin, and a reversible motor in the hermetic shell of the compressor for rotating the crankshaft, the motor operating in one direction effecting the angular displacement of the eccentric ring relative to the crankpin to the one end point, and in the opposite direction effecting the angular displacement of the eccentric ring relative to the crankpin to the opposite end point, this arrangement automatically giving different s

Abstract: A compact gas power burner is provided which includes a cylindrical mixing tube into which combustion air is discharged tangentially from a centrifugal blower located adjacent the closed end of the mixing tube, and gaseous fuel is admitted into the discharge airstream of the blower upstream from the admission location of the airstream into the mixing tube so that the swirling component of the air in the mixing tube during its passage to the open end of the tube will promote the mixing of the air and gaseous fuel, the mixing tube being provided with a honeycomb ceramic disc at its end to which it is attached to a cylindrical heat exchanger, and ignition means and flame sensors are provided on the downstream side of the ceramic disc.

Abstract: The machine comprises a first assembly including a vertical post and a carriage track with a movable carriage thereon, the carriage track being pivotally secured to the upper end portion of the post so that the assembly can be collapsed to a size permitting entry into the channel head through a manway, with the assembly being sufficiently light in weight to permit its installation in the channel head by no more than two individuals, the machine further including a separate horizontal support beam and a separate curved track which are independently separably secured to the vertical post and to the outer end of the carriage track so that a generally quadrantally shaped frame is provided, the carriage track carrying an adjustable decontamination blaster means, and means are provided for moving the carriage along the carriage track and for swinging the carriage track both horizontally and vertically in the frame so that the decontamination means has the capability of sweeping past substantially all of the interio

Abstract: An improved heat shield and thermal insulating arrangement for a hub 12 of a high temperature centrifugal fan includes a cover overlying thermal insulation 38, the cover including a circumferential portion comprising segments 42, 44, an end ring 52, and fasteners 54, 58 holding the cover to the hub and a locking collar 28, with the cover basically shielding the root portion 20 of the hub, and being remote from and unattached to the wheel plate 16.

Abstract: A refrigerant system with a high speed centrifugal compressor has an arrangement for promoting the continuous return of oil to gear and bearing housing 12 including a coalescing type filter 62 from which separated oil is passed to a jet pump 74, a thermostatically controlled expansion valve 50 operating at a low superheat value, and inwardly pumping shaft seals 26.