GB691781A - Improvements in hot-gas engines - Google Patents

Abstract

691,781. Hot gas engines.. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN. Nov. 7. 1946 [May 22, 1943], No. 33128/46. Class 7 (i). In a hot gas engine comprising means for automatically maintaining the temperature of the material of the heater at a substantially constant value a known thermosensitive device of a thermostat which is operative to control the rate of supply of heat to the heater in accordance with temperature variation of the device is arranged separately from and located in the region of the heater so as to lie heated directly by the flame gases which heat the heater, means being provided for conducting heat away from the device in proportion to the indicated power of the engine. In the figure a thermosensitive device (not shown) is located in a member 37 situated between the heaters 34, 35. The member 37 is cooled by cooling water, if desired, from the engine cooler circuit. The member is connected in the cooling water supply between the two coolers. The flow of water is controlled by a cock 42 adjusted in accordance with the engine, power by a lever operated by a speed governor and a member responsive to the mean pressure in the engine. In a modification, the member 37 is located in the flue and is cooled by a current of engine working medium by connecting it by pipes between the heater and regenerator or heater and hot chamber, and the flow may be controlled by a throttle. The thermosensitive device operates means which control the fuel supply to the burner 36. If the engine comprises a device for preheating the combustion air the preheated air may be used for conducting heat away from the thermosensitive device. The Specification as open to inspection under Sect. 91, describes a modification, Fig. 2 (Cancelled), in which a temperature sensitive device 26 is located in a recess 24 in a hollow member 23 containing a liquid whose boiling point is below the normal heater temperature. The inner end of the member 23 is located in a recess in the heater. The heat from the heater may be conducted to the temperature sensitive device by a copper or bronze rod; the device may be located in a recess in the heater. It is stated that in an engine in which the mean pressure and engine speed are in a fixed relation to one another the heat supply may be controlled solely by a device for adjustment of the engine power. If the engine is constant, the heat supply may be controlled only by the mean pressure. The Specification as open to inspection under Sect. 91 also comprises the subject-matter of Specifications 691,784 and 691,785. This subject-matter does not appear in the Specification as accepted.