Patent GB-493613-A (GB)
Title: Improvements in heat exchanging apparatus
IPC: F28D19/04
Filed: 1937-02-11
Abstract: 493,613. Centrifugal fans. LINDEROTH, E. T. Feb. 11, 1937, No. 4086. Convention date, Feb. 11, 1936. [Class 110 (i)] [Also in Groups XII, XIII, and XXVIII] A rotary heat-exchange apparatus for utilizing the heat of furnace &c. gases for heating air for combustion, for drying purposes or heating buildings or for heating liquids comprises a heat transmitting surface consisting of wires or lamellae arranged at the periphery of a rotary cylinder and having a peripheral speed greater than the speed at which gas flows through the apparatus, the wires &c. being so spaced with respect to each other and so arranged with respect to the direction of rotation as to divide the gases passing between them into layers which are considerably thinner than the distance between the wires &c. the space between the wires &c. being formed as narrow channels which are of less depth in a radial direction than their circumferential width. Fig. 3 shows one form of heat-exchange apparatus consisting of a wire gauze cylinder 1 supported at one end on a disc mounted on a rotary shaft and strengthened at the other end by a ring. The interior of the cylinder is divided into compartments A, B by a fixed screen 5. Hot gases enter the chambers A, pass through the rotating cylinder 1 and are thrown out into the spiral casing 7 after giving up heat to the gauze. Air is drawn into the compartment B and is thrown through the heated gauze cylinder 1 into the spiral casing 10. The wire gauze is cleaned by steam supplied to a chamber 12 and issuing through a narrow slot 14. A steam blower 16 may also be arranged inside the gauze cylinder. A tube 17 is arranged opposite the slot 14 to receive solid particles which are then conveyed to the chimney. The steam supply to the chamber 12 may be controlled by a valve which is opened and closed intermittently. A modified form of cleaning device comprises nozzles 25, Fig. 5, arranged on opposite sides of the gauze cylinder 1 and supplied with, steam or compressed air through pipes 27, 28 which are given a slow reciprocating motion by a rotary spindle 29 having right- and left-handed helical grooves with which a pin 30 on the pipes 27, 28 engages. Fig. 7 shows a cleaning device comprising rotary brushes 31, 32 mounted on a frame 33 which is given a reciprocating motion. The cylindrical heat exchanger may comprise two or more layers of gauze as shown in Fig. 8. Gas is admitted at 6 and flows through the gauze into the chamber A between guide blades 35 and thence to the chimney. Air is drawn through the chamber B and wire gauze and thrown into the spiral casing 10. To prevent mixing of gas with air a channel 36 is provided to convey any gas and air mixture to the gas inlet side of the heat exchanger. Soot &c. removed by blowers 12, 16 pass through the channel 36 to a receptacle 37. In cases where the gauze cylinder is of large diameter the ring 4, Fig. 9, provided at the outer end thereof is supported by steam or compressed air issuing from nozzles 42 mounted in the ring 39 of the outer casing. The ring 39 has an eccentric recess between the nozzles 42. Fig. 10 shows the heat exchange apparatus applied to a furnace for producing hot air for drying purposes. Gases from the furnace pass through the wire gauze cylinder 1 and guide blades 35 to the chamber A and air enters the chamber B and is discharged through the gauze cylinder 1 into the casing 10. Cleaning brushes are provided at 31, 32. Air from a chamber C carries soot &c. through a flue 11a to the furnace. When it is desired to heat water or other liquids apparatus as shown in Fig. 12 is employed comprising a wire gauze cylinder 1 mounted on a hollow disc 2 and ring 4 connected by tubes 52 in good heat conducting contact with the gauze 1. The disc is provided with an annular channel 53 communicating by radial channels 56, 57 with inlet and outlet passages 55, 58 in the shaft 3, and with fixed inlet and outlet passages 62, 63. Specifications 252,373, [Class 110 (i)], and 380,992 are referred to. The Specification as open to inspection under Sect. 91 comprises apparatus shown in Fig. 12 (Cancelled) for utilizing the heat of air withdrawn from a room to heat fresh air supplied to the room. Such apparatus consists of a disc 45, 46 carrying radial wires 44 arranged in front of a cylindrical frame 48 in the wall of a room to be ventilated and driven by a motor 47. Curved guide blades 50, 51 direct the air currents to and from the room to be ventilated. This subject-matter does not appear in the Specification as accepted.