摘要:
A two-point efficient gas turbine is described comprising a turbine wheel having two sets of turbine blades (20, 21,) one set (20) being designed to operate in conjunction with a high pressure HP annular duct (5) and a set of fixed HP nozzles (18,) and the other set (21) being designed to operate in conjunction with a low pressure LP annular duct (7) and a set of fixed LP nozzles (19,) a control valve (13) being provided which is operable in accordance with the speed of the turbine wheel for controlling the gas/bleed air flow in the HP and LP annular ducts (5 and 7) (Fig. 1).
摘要:
A data transmission system comprises a master control terminal (2) which is connected to a number of intelligent control terminals (3, 4) over a high speed data bus link. Each of these intelligent control terminals is connected to a number of sub-terminals (6, 7) over a low speed data bus link. The master control terminal may transmit high speed (eg. 1MHz bit rate) command signals to selected intelligent control terminals which embody microprocessors for initiating/controlling tasks performed by the associated sub-terminals in accordance with low speed command signals transmitted over the low speed data bus link.
摘要:
A solid state electric switching arrangement for switching and protecting an AC circuit against predetermined levels of overcurrent comprises a pair of switching transistors which are controlled by an output switch drive circuit to be conducting during normal operation of the AC circuit. A current level monitoring circuit is provided for monitoring the peak current levels in the AC circuit during operation thereof and is effective for producing an instantaneous change of state of the output switch drive circuit to render the pair of transistors non-conducting when the monitored peak current level exceeds a predetermined overcurrent level. A zero voltage switch-on circuit conditions the pair of switching transistors prior to switch on of the AC circuit so that the switching transistors are rendered conducting at the instant when the AC supply voltage for the AC circuit is at zero voltage level.
摘要:
A data transmission system comprises a master control terminal (2) which is connected to a number of intelligent control terminals (3, 4) over a high speed data bus link. Each of these intelligent control terminals is connected to a number of sub-terminals (6, 7) over a low speed data bus link. The master control terminal may transmit high speed (eg. 1MHz bit rate) command signals to selected intelligent control terminals which embody microprocessors for initiating/controlling tasks performed by the associated sub-terminals in accordance with low speed command signals transmitted over the low speed data bus link.
摘要:
A rotary pump system for pumping a liquid which is delivered under pressure from a backing pump 8, in which a rotary pump 1 has a pump body which is required to be drained of liquid at times when the pump 1 is inoperative, wherein the backing pump 8 has a by-pass circuit between its inlet and outlet ports, the by-pass circuit comprising a multiphase pump 13 which has a suction inlet 14 connected to a drain point 16 on the pump 1 body and a vortex chamber 17 through which liquid passes from the pump 13 outlet to the backing pump 8 inlet, a central outlet 18 of said vortex chamber being connected to an inlet port 6 of said pump 1. This allows automatic draining of the pump 1 body when use of this pump is not required.
摘要:
An electrical control system for operatively controlling and/or monitoring one or more remote power switching terminals from a master power controller terminal The power controller terminal and power switching terminal(s) are linked by a data transmission line or bus coupled to the respective terminals through D.C. isolating transformers and over which coded data signals are transmitted The coded data signals comprise coded bursts of relatively low frequency carrier signals at relatively low repetition rates and produced by an oscillator circuit which forms part of a tuned circuit at the terminal concerned which determines the carrier frequency and which includes the coupling transformer coupling the terminal to the data transmission line or bus.
摘要:
The invention provides an optical sensor (10) arranged to monitor the ratio of the constituent components of a mixed system (14) where an optical characteristic of the system is dependant upon that ratio. The sensor (10) comprises first fibre optic means (16) for conducting light to the flow passage (12) wherethrough the mixed fluid system (14) flows, second fibre optic means (22) for conducting light returned therefrom to a means for detecting changes in the returned light and for determining the ratio of the constituent components of the system (14) in dependance upon the detected changes. Particularly, a fuel management system is described where the optical sensor is used to monitor the vapour/liquid ratio in a fuel supply to an engine.
摘要:
A data transmission system for selectively controlling and/or monitoring from a central control station the condition of equipment at or associated with a plurality of remote stations, in which for the selective operation and/or monitoring of equipment at or associated with the respective remote station the central control station comprises means for generating coded command data words for transmission over a common data bus or link extending between the central control station and the remote stations, in which the remote stations comprise means for decoding coded data words and for generating status data words for transmission over said data link to the central control station, in which the data words each comprise a synchronising part and an encoded address and data part defined by bursts of A.C., and in which the respective remote stations each include an oscillator circuit which generates a continuous A.C. output signal of predetermined frequency (e.g. 100 to 200KHz) which serves on the one hand after rectification by rectifier means, to provide an isolated DC supply for data word receiver/decoding and transmitter/encoding means at the station concerned and which serves on the other hand to provide the basic AC signal for generating and transmitting coded status data words.
摘要:
A linear to rotary transducer comprising a linearly movable input structure restrained against rotation by rotation restraining means and a rotatable output structure, in which permanently biased torsion spring means having said rotatable output structure integral with it is fixed at one end relative to said rotation restraining means and provides at its other end an elongate torsion spring strip along which a linearly movable connection is provided between the linearly movable input structure and the torsion spring strip so that as the input structure and thus the linearly movable connection means move towards or away from the rotatable structure the effective location of the rotatable output structure within the active part of the torsion spring means is varied in order to produce proportional rotation of the rotatable output structure.
摘要:
An electrical control system for operatively controlling and/or monitoring one or more remote power switching terminals from a master power controller terminal The power controller terminal and power switching terminal(s) are linked by a data transmission line or bus coupled to the respective terminals through D.C. isolating transformers and over which coded data signals are transmitted The coded data signals comprise coded bursts of relatively low frequency carrier signals at relatively low repetition rates and produced by an oscillator circuit which forms part of a tuned circuit at the terminal concerned which determines the carrier frequency and which includes the coupling transformer coupling the terminal to the data transmission line or bus.