Pumps – Condition responsive control of pump drive motor – By control of electric or magnetic drive motor
Patent
1984-01-27
1986-06-17
Look, Edward K.
Pumps
Condition responsive control of pump drive motor
By control of electric or magnetic drive motor
73727, 364510, 417 43, 417 63, F04B 4906
Patent
active
045953422
DESCRIPTION:
BRIEF SUMMARY
The invention relates to to an arrangement for the control of a fluid pressure of a drive motor or engine of a turbomachine or fluid kinetic machine, particularly a pump, as well as a support for an in particular electronic pressure pick-off subject to the action of a gaseous or liquid fluid. It is known to control e.g. the electrical drive motors of pumps, as a function of the test or measured values of mechanical pick-offs. However, these suffer from the disadvantage that the measuring accuracy decreases over a period of time, due to the ageing of mechanically stressed components. In addition, such mechanical pressure pick-offs only permit a limited test value resolution, whilst they are expensive due to their constructionally-caused complicated manufacture. In order to eliminate these disadvantages, electronic pressure pick-offs have already been proposed. In the case of the differential pressure measurements, it must always be borne in mind that the pressure sensors can only be subject to the action of certain maximum differential pressures. In order to be able to take account of the use ranges which occur, it is therefore necessary to store pressure sensors with different output or capacitor levels, which is disadvantageous and costly.
The object of the invention is to provide a method and an arrangement for performing a method which, whilst using a per se known electronic pressure sensor with an e.g. piezoresistive silicon crystal, permits a simple and inexpensive control of the engine of a turbomachine, such as in particular a pump, as a function of the pressure or differential pressure of the fluid to be delivered by said turbomachine. In addition, a device is to be provided for the pressure sensor, by means of which it is made possible to use electronic pressure pick-offs for differential pressure measurements diverging from their design range.
According to the invention, this object is achieved in that the pressure or differential pressure of the fluid delivered by the turbomachine is measured by an electronic pressure sensor, whose transducer is temperature-compensated, then the output signal of the pressure sensor is converted into a current or voltage and this current or voltage value acts on a regulator or regulating unit used for controlling the engine.
In a special development of the invention, the arrangement for achieving the object is constructed in such a way that an electronic pressure pick-off in operative connection with the fluid to be measured is connected on the measured value output side with a voltage/current converter, whose output is connected to a regulator or regulating unit in operative connection with the turbomachine engine. Preferably, the electronic pressure pick-off is constructed as a piezoresistive silicon pressure sensor, whose silicon bridge is connected to a temperature compensator.
The arrangement permits an analog test value reception and processing in the regulator or regulating unit, whilst simultaneously the possibility exists of representing the test values in an analog display and connecting the transducer via an A/D-converter with a computer, by means of which it is possible e.g. to optimize the operation of the fluid-containing system.
According to a further development of the invention, two support parts are provided for each pressure sensor which, whilst receiving a pressure sensor, can be interconnected and can be brought into operative connection with the fluid to be measured by means of connecting pieces constructed on the end portions of the support parts in such a way that by rotating the support parts about their common central axis by a predetermined angle, it is possible to adjust the maximum measurable pressure difference on the pressure sensor.
Further features of the invention are described in the subclaims.
Embodiments of the invention are described hereinafter relative to the drawings, wherein is shown:
FIG. 1 an arrangement according to the invention for performing the fluid pressure-dependent control represented in the manner of a circuit
REFERENCES:
patent: 3187510 (1965-07-01), Bunnelle
patent: 3206980 (1965-09-01), Nelson
patent: 3646815 (1972-03-01), Martin et al.
patent: 4063824 (1977-12-01), Baker et al.
patent: 4221134 (1980-09-01), Ekstrom
patent: 4259620 (1981-03-01), Oates
patent: 4320664 (1982-03-01), Rehn
Christlieb Jan
Muller Karl
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