Patent GB-191010932-A (GB)
Title: Improvements in and relating to Combined Installations for Power Generation and Industrial Heating.
Inventor: WEEKES ROBERT WILLSHER
IPC: F01K7/16
Filed: 1910-05-03
Granted: 1911-04-27
Abstract: 10,932. Weekes, R. W. May 3. Automatic gear.-Relates to combined installations for generating power by steam motors and for supplying heat for industrial purposes from the exhaust steam, of the type in which two motors A, Z, say, receive steam in parallel and co-operate in the performance of the work to be done and in which the exhaust steam from one motor A supplies the heat. The invention comprises means whereby, on an increase or decrease of pressure, or consequently of temperature, of the exhaust steam of the motor A supplying the heat, the steam supply to that motor is automatically decreased or increased. In the form shown in Fig. 1, the upper side of the piston b is exposed to atmospheric pressure and the lower side to the pressure of the exhaust steam from the motor A, so that any variation of the exhauststeam pressure acts through the piston band spring-controlled lever d to adjust the steamadmission valve e of the motor A. The corresponding variation of the speed of the motor A and of the work done by it is compensated for by the speed governor of the motor Z. In large installations, the steam-admission valve may be actuated by relay mechanism, for example, a piston j, Fig. 2, the motion of which is controlled through the floating lever g and valve h by the piston b subject to the exhaust-steam pressure. Instead of connecting the lever d, Fig. 1, or the piston j, Fig. 2, directly to the steam-admission valve, the rate of supply of steam to the motor A may be controlled through mechanism normally under the action of the speed governor only. This may be done either by connecting the lever or the piston to the constraining-spring of the governor, or by the action of the reversible electromotor k, Fig. 3, on the arm n<3> of a lever connected by the arm n<1> to the governor and by the rod o to the steam-admission valve, the working of the electromotor being controlled by an electric switch s<1>, s<0>, t<0>, t<1> connected by the link u to the lever or piston. To prevent overloading of the motor Z when the heat demand is exceptionally small, the automatic means may be thrown out of action by a spring- controlled valve v, Fig. 4, interposed in the steam-supply pipe of the relay cylinder of Fig. 2, and closed by a solenoid w when energized by the completion of a circuit effected by a wattmeter x provided with a limit switch x'. To prevent overloading of the motor A when the heat demand is exceptionally large, live steam may be introduced into the exhaust-steam pipe of the motor A through a valve closed normally by a spring and opened either by a solenoid when suitably energized or by the action of the electromotor k, Fig. 3, near the limit of its motion. When a supply of steam at a different temperature is also required, this may be supplied either by the exhaust steam of the motor Z under similar regulating contrivances, or by steam diverted at some intermediate stage, as described in Specification 27,032/07. In a modification, the two motors may be geared together by coupling each to an electrical machine which is adapted to absorb and regenerate power, the two regenerating- machines being so interconnected that either can supply energy to drive the other. In this arrangement the motor Z may be thrown out of action if provision is made for storing the electrical energy developed by the electrical machine coupled to the motor A in such a way that the stored electrical energy can be used to supplement the steam motor.