Abstract: A device for melting snow and ice from outdoor surfaces is disclosed in which a plurality of mats are provided. Each mat includes lengths of hose tubing in which flows a warmed mixture of water and antifreeze, which mixture is heated by a heating unit operatively connected with the mats through appropriate supply and return lines. The mats themselves are grouped into three classes: Driveway mats, walkway mats, and sidewalk mats, all of which may be arranged to adapt to many different outdoor surface configuration. Most of the mats are also provided with a set of three valves which are used to control the flow of mixture, so that mats down-line may either be supplied with the mixture or may be cut off from it, so that selected surface areas may be warmed to have the snow and ice thereon melted. Each mat is further comprised of an upper mat portion and a lower mat portion, where each portion is made up of three separate layers designed to conserve as much heat energy as practicable.

Abstract: A heat exchange apparatus including a generally cylindrical hollow housing having an upper end and a lower end, and a heating device disposed in the lower portion of the housing. A heating coil assembly is disposed within the housing over the heating device, and includes a radially inner coil bank and a radially outer coil bank adjacent the inner wall of the housing. An intermediate coil bank is connected between the inner and outer coil bank and includes a plurality of helical convolutions of increasing diameter as they successively occur in an axial direction from the lower end of the housing toward the upper end thereof. A baffle frame assembly interconnects and spacially orients the inner and intermediate coil banks, and radially outwardly deflects heated gases from the heating device.

Abstract: A heat exchanger of the type in which spaced apart plates define flow passages between them and alternating flow passages conduct different fluid media in heat exchanging relationship through the plates. One of the fluid media is a mixture of a gas phase into liquid phase and, according to the invention, the mixing device is provided in the passage for the mixture and is in the form of a bar which can brace the two plates flanking it against deformation under pressure. This bar has channels for one of the phases in a duct extending the length of the bar and communicating with the channels through spaced apart openings or orifices or with the passage downstream of the bar for the other phase through such openings or orifices.

Abstract: A valve train of an overhead camshaft engine is provided with a mechanism for taking up slack in the valve train. The slack take up mechanism is constituted by a tappet, an oil pressure chamber, a coil spring, etc. and constructed such that leakage of the oil pressure chamber takes place for take up adjustment during each cycle of valve operation.

Abstract: A hollow cam shaft of the type wherein lubricating oil is distributed to the cam portions includes a rod member positioned inside the shaft pipe member and spaced from the inner pipe surface by shaft end members and guide strips to form a reduced, annular volume to be filled with oil during engine start-up. The method of making the hollow cam shaft includes forming the rod member from a resinous material by injection molding, using a removable mold positioned in the pipe through-hole, and, in a preferred embodiment, flowing the resin through the mold cavity and into a recess located in the distal shaft end member, which recess has an enlarged portion for capturing the hardened resin rod end and facilitating mold removal.

Abstract: An improved high speed process for texturing continuous filament yarn is provided wherein the improvement comprises cooling the yarn, subsequent to texturing and prior to applying tension, by contact for at least 4 milliseconds with a curved surface at a temperature of -29.degree. to 2.degree. C. and an RMS of up to 10, frictional forces creating a yarn tension of 0.036 to 0.45 gram per denier per end at the surface. Apparatus is also provided for cooling the continuous filament yarn subsequent to texturing and prior to applying tension. The apparatus comprises a curved surface having a minimum length for yarn contact of 7.6 cm, an RMS of up to 10 and a temperature of -29.degree. to 2.degree. C. Textured yarn brought into contact with the surface for at least 4 milliseconds at a yarn tension of 0.036 to 0.045 gram per denier per end is cooled to increase yarn stability and prevent pullout of yarn texture.

Abstract: A tube and fin heat exchanger is disclosed comprising a pair of tanks, a plurality of tubes of non-circular cross section connected at their ends to tanks, and a plurality of corrugated fin strips each arranged between and extending along the length of adjacent ones of the tubes. Each of the fin strips has a constant corrugation spacing extending along an intermediate and almost the entire length of the tubes and a smaller corrugation spacing extending the remainder of the length of the tubes to their ends so as to provide increased resistance to ballooning of the tubes at their ends by internal pressure.

Abstract: In an internal combustion engine with overhead valve and overhead cam type valve gear, a self-pumping hydraulic-type lash adjuster located downward from the lubricated camshaft and supplied by oil run-off from the camshaft and associated rocker arm member. The lash adjuster includes a housing with a cylindrical aperture therein in which a first plunger member is tightly slidably fitted for reciprocation forming a power chamber with the lower end of the housing. A second plunger member is relatively loosely fitted in the aperture of the housing and has a portion extending from the upper end of the housing for receiving force inputs from the rotating camshaft and associated rocker arm member. A reservoir chamber is formed by the first and second plunger members and is communicated by one-way check valve means to the power chamber to permit flow from the reservoir to the power chamber, but not otherwise.

Abstract: Process and apparatus for the changing the temperature of a gaseous stream using flexible fluoropolymer tubes having specified dimensions and configurations. The tubes are separated by spaces which serve the dual purpose of regulating the free span of each tube segment between spacers at a distance of about 20 to 90 cm and separating successive rows of tubes by about 1.25 to 3.0 times the diameter of the tubes. This configuration permits a low frequency, high amplitude vibration of the tubes that has the dual effect of a self-cleaning function and an increase in the heat transfer coefficient of the tubes.

Abstract: A heat exchanger (1) has a plurality of metallic fluid flow tubes (5) secured adjacent their ends by tube sheets (6, 7). A non-corrodible, erosion resistance, non-metallic elongated sleeve-like insert (30) is telescopingly mounted within a tube. The insert length corresponds closely with the length of the finite tube end section (21) subject to damage from fluid turbulence, which has been found to be in the range of about 5 to 12 inches depending upon the tube I.D. as well as fluid velocity and pressures. To prevent undesirable penetration of corrosive materials and gases into any void that may exist between the plastic insert and metallic heat exchanger tube, a filler (33) of adhesive epoxy or the like may be applied to fill the void. The insert (30) provides only a single element reduction in passage diameter. When a tube cleaning brush (25) and basket (26) system is also utilized, brush diameter reduction relative to the tube I.D. is minimized.

Abstract: A heat exchanger baffle plate having a plurality of openings for receiving a plurality of longitudinally-extending tubes, is disposed within a shell and is constructed of a vibration-damping material.

Abstract: A cooling system for a computer that has a circuit board provided whereby the computer can be placed thereon allowing air blown from a blower motor to flow across a base member up through the computer thus cooling the circuit board.

Abstract: The invention relates to improvements in heat exchangers of the type having a container which defines a cylindrical cavity and a cluster of parallel cooling tubes extending through the cylindrical cavity. The housing is provided with a fluid inlet, a fluid outlet, and a center baffle dividing the cylindrical cavity into an inlet compartment and an outlet compartment. The inlet and the outlet are located on opposite sides of the center baffle, but near one edge thereof. An opening is provided near the opposite edge of the baffle, such that fluid must circulate through a nearly circular path within the cylindrical housing between the inlet and the outlet conduits. A second fluid such as cool air, may be blown through the parallel tubes for removing heat from the fluid in the cavity.

Abstract: This invention provides a structure of a heat exchanger in which a hollow drum, into which a heating or heated medium can be charged, is rotatably housed in a cylindrical outer casing, a large number of hollow projections are formed on the outer peripheral surface of the hollow drum, heating medium supply and discharge passages defined by a partition are provided within the hollow drum, and these heating medium supply and discharge passages communicate with hollow portions of the projections.

Abstract: A tube-in-shell heat exchanger has double sealing joints between the tubes and a tube plate of the heat exchanger constituted by the provision of a secondary tube plate spaced from the normal tube plate and through which each tube extends with sealing in addition to the normal tube to tube plate sealing joints, there being a bellows enveloping the tubes and sealed to both the normal and the secondary tube plates. The space between these tube plates can be monitored for leakage.

Abstract: A heat exchanger panel having vertical tubes (1, 2) which form loops between an inlet (1A) and an outlet (1B) via which they are suspended from a rigid structure (3, 4), and intended to come into contact via their outer surfaces with a soot-laden gas characterized in that its tubes are separated from one another at a pitch which is a little greater than their diameter, in that the tubes of the central portion are interconnected by fins, and in that the end tubes directly connected to the suspension structure are fixed to one another and to the nearest adjacent tube by short members (14, 15) welded on either side to adjacent tubes (21, 22, 23) at a level below that of the top loops of the panel, and are connected to one another and to the adjacent tube below the fixing members by fins (26).

Abstract: A heat exchanger apparatus includes a heat exchanger constituted by a multiplicity of heat exchanger units laminated one upon another and a filter having first and second filter elements for removing any unnecessary substance mixed into a working fluid. A fixing member (bolt) is disposed such as to extent through the heat exchanger so that the heat exchanger and the filter are integrally secured to each other. The heat exchanger is provided therein with a communicating passage communicated with the upstream side of the first and second filter elements, a main flow passage communicated with the downstream side of the first filter element, and a subsidiary flow passage communicated with the downstream side of the second filter element.

Abstract: A heat exchanger for dehumidification of compressed air. The improved heat exchanger employs an air-to-air heat exchanger portion and a air-to-refrigerant heat exchanger portion that are arranged substantially parallel and coextensive. Each of these heat exchanger portions are made up of a plurality of tube units, each tube unit having three concentric tubes. The tubes terminate at each end in separate header units. Incoming air is passed co-currently in the air-to-air heat exchanger portion with air that has been dehumidified, whereupon a precooling stage is achieved. This precooled air is then passed countercurrently to refrigerant in the air-to-refrigerant portion of the heat exchanger for causing condensation of moisture therein. This cool air is passed through a moisture separator, with the dehumidified air being recycled through the air-to-air heat exchanger portion prior to use, as set forth above. The components are fabricated from standard tubing elements.

Abstract: A wide range temperature control system for controlling and maintaining the temperature of a first cooling liquid in an indirect heat exchanger at a predetermined setpoint within a wide range of temperatures is disclosed. The system proportions flow of a second cooling liquid between a cooling coil located in the heat exchanger and a bypass path. Flow through the bypass path is regulated by a temperature sensitive valve responsive to outflow temperature of the second cooling liquid from the heat exchanger. Bypassed flow mixes with the outflow from the heat exchanger and thereby establishes and maintains the temperature sensitive valve in a proportional flow mode. The flow of second cooling liquid through the cooling coil is proportioned to the differential in temperature between the second cooling liquid and the first cooling liquid and to the dynamic heat conditions within the heat exchanger at any time.

Abstract: A high pressure heat exchanger assembly for a compressor having a shell and tube-type design. An elongated bundle assembly is received within the shell. The bundle assembly has a plurality of elongated tubes extending generally longitudinally through the shell. The tubes are securely affixed to fixed and floating tube sheet assemblies positioned at opposite ends of the shell. The fixed tube sheet assembly is securely attached to one end of the shell and the floating tube sheet assembly is allowed to float with respect to the other end of the shell. A seal between the floating tube sheet assembly and the end of the shell prevents the escape of internal fluids. Each tube sheet assembly is provided with an inner and outer tube sheet member separated by a plurality of spacers to create a vented space therebetween open to the outside atmosphere.