GLOBAL COOLING, INC.
|GLOBAL COOLING, INC. Patent applications|
|Patent application number||Title||Published|
|20140034157||PASSIVE VACUUM RELIEF VALVE FOR ULTRA-LOW TEMPERATURE FREEZERS - A passive vacuum relief valve for an ultra-low temperature freezer. A thermally conductive tube extends through a freezer cabinet wall and opens into the interior cabinet space. The tube also extends outwardly from the cabinet wall in thermal exposure to ambient air so that it can receive heat from the ambient air. A valve enclosure has a chamber opening into the tube and is also positioned in the ambient air. A check valve, preferably a ball type, is formed in the valve enclosure and is polarized in a direction permitting ambient air to flow through the chamber and the tube into the freezer cabinet. The exposed tube is passively heated by the ambient air and provides a thermal conduction path to the valve and to the portion of the tube extending through the freezer cabinet wall to prevent moisture from freezing and locking the valve and/or obstructing the tube.||02-06-2014|
|20130255283||Energy Efficient Biological Freezer With Vial Management System - An automated, ultra-low temperature freezer having multiple structural features that reduce heat transfer into the freezer, protect its internal mechanical devices against low temperature mechanical binding of their movements, allow defrosting and autoclaving as a result of only minimal changes to the conventional CO||10-03-2013|
|20130088176||Method For Use In Controlling Free Piston Stirling Coolers And Heat Pumps Driven By A Linear Alternator - A method for use in controlling a free piston Stirling machine having a cold end and a warm end and driven by a linear motor having an armature winding to which a drive voltage is applied. The method comprises (a) sensing internal mechanical collisions; (b) repeatedly sensing the temperature of the cold end, the temperature of the warm end and the drive voltage; (c) storing, as associated data, a value representing drive voltage, the temperature of the cold end and the temperature of the warm end at the time of sensed collisions; and (d) limiting the drive voltage to less than the drive voltage that was sensed at a collision and is stored in association with stored warm end and cold end temperatures that are proximate currently sensed warm end and cold end temperatures.||04-11-2013|
|20130042607||Free-Piston Stirling Machine In An Opposed Piston Gamma Configuration Having Improved Stability, Efficiency And Control - An opposed piston gamma type Stirling machine has its displacer driven by a linear electromagnetic transducer that is drivingly linked to the displacer and is located on the opposite side of the power piston's axis of reciprocation from the displacer preferably in the bounce space. The linear transducer is controlled by an electronic control as a function of sensed inputs of Stirling machine operating parameters. In addition to allowing improvements in stability and efficiency, such a Stirling machine operated as a cooler/heat pump can also be controlled so that its displacer can be driven at (1) a phase angle that pumps heat in one direction through the machine or (2) at another phase angle that pumps heat in the opposite direction through the machine and allows selectively switching between the heat pumping directions.||02-21-2013|
|20110095542||LUBRICANT FREE, REDUCED MASS, FREE-PISTON, STIRLING MACHINE HAVING RECIPROCATING PISTON DRIVINGLY LINKED TO ROTARY ELECTROMAGNETIC TRANSDUCER MOVING IN ROTATIONAL OSCILLATION - A free-piston Stirling machine drivingly coupled to at least one rotary electromagnetic transducer. At least one pulley is oriented in a plane of a reciprocating piston connecting rod. At least one motion translating drive link connects the connecting rod to the pulley by at least two straps so that the pulley moves in rotationally oscillating motion. The two straps extend along an arcuate surface of the pulley into connection to the piston rod at two spaced locations. The pulley is linked to a rotary electromagnetic transducer so that both move in rotationally oscillating motion. Preferably a piston spring resonates the piston at an operating frequency of the Stirling machine and a torsion spring resonates the pulley in rotational oscillation at the operating frequency of the Stirling machine.||04-28-2011|
|20110056196||BEARING SUPPORT SYSTEM FOR FREE-PISTON STIRLING MACHINES - A bearing support system for a piston and its connecting rod in which the bearing system supports the combined piston and connecting rod by only two bearings, a gas bearing at the power piston (or displacer) and a radially acting spring bearing at its connecting rod. The spacing between them meets prescribed relationships and preferably exceeds a calculated value based upon chosen engineering parameters. A non-compliant connecting rod is fixed to an end of a piston which has a clearance seal length in the range of 0.3 times the diameter of the piston and 1.5 times the diameter of the piston. The distance from the gas bearing to the effective point of connection of the radially acting spring bearing to the connecting rod is greater than the seal length of the piston. The allowable off-center distance A for the radial displacement of the fixed connection of the radially acting spring bearing to the connecting rod is considerably greater than the diametrical clearance gap g which illustrates the reduction in the required precision for adjusting the position of the radially acting spring bearing. The piston and connecting rod unit is not supported by additional bearings that introduce additional alignment problems.||03-10-2011|
|20110005220||GAMMA TYPE FREE-PISTON STIRLING MACHINE CONFIGURATION - An improved free piston Stirling machine having a gamma configuration. The displacer and each piston is reciprocatable within a cylinder having an unobstructed opening at its inner end into a common volume of the workspace. The common volume is defined by the intersection of inward projections of the displacer cylinder and the piston cylinders. The displacer and the pistons each have a range of reciprocation that extends into the common volume. A displacer drive rod is reciprocatable in a drive rod cylinder and both are positioned outside the common volume and on the opposite side of the common volume from the displacer. The displacer is connected to the displacer drive rod by a displacer connecting rod. Importantly, the displacer and pistons have complementary interfacing surface contours formed on their inner ends which substantially reduces the dead volume of this gamma configured machine.||01-13-2011|
Patent applications by GLOBAL COOLING, INC.