Abstract: A cooling and refrigeration apparatus cools one or more surfaces of one or more food handling devices, such as meat cutting machines, scales, and food preparation areas, so as to inhibit bacterial and other microbial growth thereon. The apparatus includes one or more coolers to lower the temperature of the food contact surfaces to a predetermined temperature which inhibits bacteria and other microbial growth thereon, by providing one or more surfaces at the predetermined temperature adjacent to or at the one or more food handling surfaces. The cooler includes a distributor system of conduit passageways and other distribution devices to distribute one or more cooling media to conductive surfaces of the one or more food handling devices.
Abstract: An apparatus for preventing thermal deformation of a machine tool has a feed unit which heats a heat transfer fluid and pumps it out to a heat exchanging portion. The heat exchanging portion has at least one heat exchanging unit capable of being expanded and shrunk in accordance with the heat transfer fluid therein. The heat exchanging unit is arranged in a prescribed portion of a machine tool. The portion of the machine tool is heated by the heat exchanging unit arranged therein, whereby thermal distribution of the machine tool is equalized and heat deformation thereof is suppressed. The heat transfer fluid passed through the heat exchanging unit is recovered by a discharging portion and fed back to the feed unit. The heat exchanging unit is maintained in an expanded state by controlling the flow rate of the fluid passing therethrough by a flow control valve, so that heat exchanging operation can be carried out effectively.
Abstract: A control system for effecting ultra-precision temperature control for a controlled system having large load fluctuations or including a dead time component. A control unit (5) instructs a high-precision PID temperature controller (10) to renew and correct a control target value T.sub.0,NEW for the supply fluid temperature T.sub.0 only by a temperature difference .DELTA.T=T.sub.C -T.sub.2 between a set value T.sub.C for the return fluid temperature T.sub.2 of a heat transfer fluid and the actually controlled return fluid temperature T.sub.2. In response to the instruction, the high-precision PID temperature controller (10) controls the heating power of a heater (17) for heating control through a constant-power thyristor phase controller (16). The heater (17) heats the heat transfer fluid and sends it to a machining apparatus (1) through a closed damping tank (21). The heat transfer fluid exchanges heat with the machining apparatus (1) and is then returned to a precooling means.
Abstract: A temperature control apparatus for a machine tool includes four temperature sensors for detecting a reference temperature, outlet temperature of heat transfer fluid at an outlet of a heat exchanger, and temperatures of the heat transfer fluid at both inlet and an outlet of a machine tool element having a heat generating source. The four temperature sensors are arranged to constitute a differential temperature detecting means that activates control means to control temperature of the heat transfer fluid from the heat exchanger so as to minimize both deviations of heat transfer fluid temperature and steady-state deviations of machine tool body temperature.
Abstract: To reduce the heat present in hot hydraulic oil, the oil is passed through a heat exchanger in heat exchange relation with water. The temperature of the water entering the exchanger is at least 28.degree. C. and the quantity of water circulated through the exchanger is such that the difference between the ingoing and outgoing temperatures of the oil at the heat exchanger is not more than 10.degree. C.
Abstract: A method of and apparatus for controlling the heat deformation of machine tools having a plurality of frames is disclosed in which the temperatures at symmetrical or opposite portions of the frames are measured, analyzed and then utilized to maintain the temperatures of the frames at the same temperature, or to maintain a constant temperature difference between the frame portions. The frame portions may either be heated or cooled to obtain the desired temperature.
Abstract: The invention relates to a mechanical press and in particular to a means for achieving thermal stability, particularly shutheight stability, by utilizing the waste heat from lubricant circulated through the drive assembly to heat the uprights. The oil is circulated through the crankshaft and connection arm assembly in the crown and then caused to flow through a thermal transfer device mounted to each of the uprights wherein the heated oil transfers a portion of its heat to the uprights so that they elongate due to thermal expansion at the same rate as the connection arms. The thermal transfer devices comprise a plurality of baffles over and through which the oil flows under gravity or pressure, wherein the baffles cause the oil to form a plurality of vertically spaced pools in good thermal contact with the uprights.
Abstract: In the exemplary embodiment, two machines are arranged in a common cabinet-like housing insulated toward the exterior from sound conducted through solids and airborne sound. For the purpose of fresh air supply to the machines, there are provided common fresh air channels connected via an inlet port with the exterior air. In order to discharge the exhaust air, separately arranged exhaust air chambers and/or exhaust air channels are provided which discharge into the open air via a common outlet port, disposed at a location remote from the inlet port. The fresh air channels and the exhaust air channels are so designed and arranged that the air is deflected many times during its flow through the housing. The installation particularly serves the purpose of housing dental vacuum generating and compressed air generating electric machines.
Abstract: A small container contains a frozen liquid or other coolant and is magnetically adhered to a metal microtome blade either by means of a permanent magnet disposed within the container or a magnetized metal wall portion on the container, for cooling the blade. The container may be sealed or refillable. There is also disclosed a container having inlet and outlet openings for permitting a continuous flow therethrough of coolant such as carbon dioxide from a dry ice source.
Abstract: A system for operating a hydraulic tool is disclosed in which heated hydraulic fluid being returned to a fluid reservoir from the tool is cooled by a refrigeration system. The heated hydraulic fluid is introduced into the hollow interior of a distributor from which the fluid exits through a plurality of orifices in a planar side in the form of plural sprays directed onto adjacent portions of a coil carrying evaporating refrigerant. The sprays flow over the coil to effect substantial transfer of heat from the hydraulic fluid to the refrigerant, with the cooled hydraulic fluid being stored in the reservoir prior to being pumped to the hydraulic tool as needed.