Patent GB-1117628-A (GB)
Title: Improvements in means for reducing leakage in rotary regenerator
IPC: F02C7/105
Filed: 1966-09-06
Abstract: 1,117,628. Thermal regenerators. GENERAL ELECTRIC CO. 6 Sept., 1966 [29 Dec., 1965], No. 39722/66. Heading F4K. [Also in Division F1] The invention relates to means for preventing leakage from a rotary regenerative heat exchanger of a gas turbine engine and is described with reference to a heat exchanger as described in co-pending Specification 1,117,627. Annular sealing members 110, 111 are secured at the inner and outer peripheries at the upstream end of the heat exchanger rotor assembly, the sealing member 110 being secured to the cylindrical shell 54, and the sealing member 111 being secured to the annular header 56. Corresponding annular sealing members 114, 115 are secured to the stationary structure opposite the sealing members 110, 111, the members 114, 115 being formed by arcuate elements 114a, 115a which are urged into contact with the rotor sealing members 110, 111 by means of springs 118, 119, Fig. 3, not shown. Corresponding sealing means are provided at the downstream end of tlhe rotor. Means are pro. vided to prevent leakage in a circumferential direction from the arcuate headers 85, 95 through which high pressure air is flowing. Sealing members 120, 121 are provided on the stationary structure adjacent the circumferential ends of the arcuate upstream header 85, the circumferential extent of each of the members 120, 121 being greater than that of the rotor ducts 71, 72 and associated heat exchange matrices 75, 76. Radially disposed sealing members 135 are secured at the upstream end of the rotor assembly to co-operate with the stationary sealing members. The rotor sealing members 135 extend between the annular sealing members 110, 111, Fig. 8, and each member 135 is disposed upstream of a rotor tubular member 55 so that the ducts 71, 72 and heat exchange matrices 75, 76 are not obstructed. The stationary sealing members 120, 121 are formed with radially extending grooves 124 of T-section, Fig. 6, and a seal member 130 also of T-section is disposed in each groove, the seal member 130 being acted upon by a spring 132 so that the limb 131 of the seal member projects from the surface 122 of the sealing member 120. As the rotor drum is rotated, the sealing members 135 thereof engage against the limbs 131 of the seal members 130 so that leakage from the header 85 in a circumferential direction is prevented. Openings 138 and 139 are provided in the sealing members 120 and 121 respectively, the openings being interconnected by a duct 140 in which is disposed a one-way valve. The object of this arrangement is to reduce carry-over loss and operates as follows: when a pair of rotor ducts 71, 72 which have just passed between the compressed air flow headers 85, 95 are passing across the sealing member 120, the space within the air ducts 71, 72 communicates with the opening 138 so that compressed air which otherwise would have passed into the turbine exhaust gas flow through duct 87 now passes through duct 140 and through the opening 139 in the sealing member 121 to a pair of rotor ducts 71, 72 which are just entering the air flow sector. This air is therefore not lost but is passed on to the combustion section. Similar means are provided at the downstream end of the rotor drum.