SU1556547A3 - System for diagnosis of positive-displacement pump performance - Google Patents

Abstract

A system for measuring the flow rate of fluids discharged from positive-displacement pumps, and real-time monitoring of these pumps. The system comprises pressure and proximity sensors and a microcomputer. The pressure sensors transmit the pressure in the discharge chambers of the pumps to the microcomputer in the form of signals. The proximity sensors provide a reference in the operating cycle of the pumps. The computer monitors sensor status and processes the data received from the sensors to provide monitoring of the pump. It transmits the results via a serial communications bus. In the event of a malfunction, an alarm is transmitted.

Description

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From individual pumps, local consoles 2 controls, the number of which may be equal to the number of controlled pumps, microcalculators 3, which, depending on their type, can be connected to one or several pumps. FIG. Figure 1 shows that microcalculators 3 can be connected to pumps k with three working chambers 5 each and to pump 6 with five working chambers.

Each pump has a pressure sensor 7 and a non-contact 8 position sensor. The number of pressure sensors 7 connected to the microcalculator 3 is equal to the number of working chambers of 5 pumps, and the number of proximity sensors of the 8 position is equal to the number of connected pumps A and 6.

Each working chamber. 5 is formed in the pump head 9, which includes a pump working body in the form of a plunger 10, valve distribution means in the form of a suction valve 11 and a pressure valve 25 12, the valves of which are loaded with springs 13 and 14, respectively, suction 15 and pressure 16 collectors. The pressure sensor 7 in the pd6o chamber 5 can be mounted in the lid 17 (Fig. 2) or it can be located in any other convenient for mounting location of the head E, limiting the working chamber 5.

The diagnostics system includes a device for analyzing signals from pressure sensors 7 and position 8, made in the form of a microprocessor system 18 with clocks, tires and accumulator 19, allowing you to store a certain amount of information, such as the characteristic calibration values of pumps C and 6, which are connected to the microcalculator 3 Connection elements 20 are connecting elements on multipoint serial data buses. Pressure sensors 7 and position 8 are connected to microprocessor system 18 by means of an accord5

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elements 21 and 22, respectively, as shown in the block diagram, shown in FIG. 3

The proximity sensor 8 position captures the moment of passing a sensor of any mark applied directly on the working body or an element of its mechanical drive, and the type of mark is chosen depending on the type of sensor or

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The preferred variant of the mark is the hundred; 1 th column 23, replicated on the plunger 10, used in conjunction with an inductive sensor. 5 However, an optical sensor can be used that monitors the passage of a label printed on the plunger 10, or a sensor made using the Hall effect, with a mark in the form of a magnet. The mark can be applied on any element of the drive of the working body, for example, on one of the rims of gear wheels, etc. depending on the type of drive.

The diagnostic system works as follows.

FIG. k depicts three functional time curves. Curve 21 shows the change in the output signal of the displacement transducer measuring the position of the valve of the discharge valve 12. The maximum of curve 21 corresponds to the contact of the valve 12 with the saddle — the valve is closed. When curve 21 begins to decrease, this means that the valve 12 is removed from the saddle and the pumped medium from the working chamber 5 by the plunger 10 is displaced into the discharge manifold 16. If you know the moment of the plunger 10 in the position of the bottom dead center, and the moment when the valve 12 is detached from the seat, it is possible to calculate the geometric volume displaced by the plunger 10 between these moments. Curve 22 shows the change in signal of pressure sensor 7 in working chamber 5, which corresponds to the observed valve position of discharge valve 12. Curve 23 is the time derivative of curve 22 and, according to the invention, allows pressure sensor 7 to be used instead of a displacement sensor monitoring the valve position injection valve 12 relative to its seat. The maximum of curve 23 corresponds exactly to the moment of full opening of valve 12. This property is used in logic diagrams of microcalculator 3 to determine the moment of opening of valve 12, one of the 7-wave sensor waveform in the working chamber 5. Analog i 1. The erasom calculates the moment pro, oi,. "of the discharge valve 12.

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The invention provides that for determining the moment of discovery and

closing the discharge valve 12, you can use the signals of two pressure sensors 7, one of which is installed in the working chamber 5, and the second in the pressure manifold 16, however this requires the use of sufficiently accurate pressure sensors to compare them. The use of correlation algorithms makes it possible to correct and compare the signals of these sensors on a true time scale, even if they do not have good characteristics in terms of accuracy, however, the use of these algorithms may be too long in relation to the requirements of a true time scale.

In some cases, the change in - the volumetric efficiency of the pumps with respect to their operating speeds and the calculation of the efficiency of the microcalculator 3 occurs slowly; in this case, several pumps can be connected to the same pump.

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before the passage of the mark on the plunger 1 in front of the Sensor 8 movement.

Similar observations can be made to diagnose damage to suction valves 11 or damage to the springs 13 and. These observations are mathematically matched. provision of microcalculators of torus 3

When the diagnostic system is running, the microprocessor system 18 executes a program that provides the following tasks:

initialization of the microprocessor system after applying voltage to the device;

collecting data from pressure and displacement sensors 8;

calculation of the moments of opening and closing of the discharge valves 12 of each working chamber 5;

analysis of the signals of the displacement sensors 8;

microcalculator 3, which calculates actual volumes, calculates the volumetric efficiency of each pump into the working chamber 5 and pushes the queue and uses the volume efficiency stored in accumulator 19 to calculate as often as required from her;

calculation of the volumetric efficiency of each pump;

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before the passage of the mark on the plunger 10 in front of the Sensor 8 movement.

Similar observations can be made to diagnose damage to suction valves 11 or damage to the springs 13 and. These observations are used by the appropriate mathematical support of the microcalculator 3

When the diagnostic system is operating, microprocessor system 18 executes a program that provides the following tasks:

initialization of the microprocessor system after applying voltage to the device;

collecting data from pressure sensors 7 and displacement 8;

calculation of the moments of opening and closing of the discharge valves 12 of each working chamber 5;

analysis of the sensor signals 8 recalculation of the actual volumes injected into the working chamber 5 and displaced

taken from it;

calculation of the volumetric efficiency of each pump;

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calculation of the volume flow and the working volume of each pump;

data transfer to the data bus:

execution of test programs or special programs for calibration, input into a permanent drive or transfer of certain parameters,

FIG. 6 shows the display panel of the diagnostic system console,

for example, at each second, the volumetric flow of each pump, based on its operating speed and this assumed volumetric efficiency as a constant value after the previous calculation.

FIG. Figure 5 shows the recording of 2k signals and 25 two pressure sensors 7 placed in two different working chambers 5. A 2k signal curve indicates that the pressure sensor 7 is located in which you can have a visual back-up chamber 5 that has working defects, indicating an inoperative valve 12, and the signal curve 25 shows that the pressure sensor 7 is located in the working chamber 5,

Claims (1)

The discharge valve 12 of which, with the claims of the invention, has damage, for example a loss of tightness, in this case there is a leak from the discharge manifold 16 to the side of the working chamber 5 with the valve closed. The vertical bars on curves 2k and 25 show the moments of passage of the corresponding marks in front of the displacement sensor 8. The pressure in the vsana specific working chamber and a specific valve. A diagnostic system for the operation of a volumetric pump with valve distribution, including electrical pressure and position sensors associated with a signal analyzer, is sensed in at least one working chamber of the pump and its discharge manifold, and the position sensor in the drive part of the pump working body, characterized in that, in order to expand the functionality of the sieve collector 15, it is greater than the pressure in the discharge manifold 16. The invention is based on the observation that the curve 2k shows that the pressure in the chamber 5 with a damaged valve 12 is not increased calculation of the volume flow and the working volume of each pump; data transfer to the data bus: execution of test programs or special programs for calibration, input into a permanent drive or transfer of certain parameters, FIG. 6 shows the display panel of the diagnostic system console, on which it is possible to have a visual display of working defects with an indication which it is possible to have a visual display of working defects with an indication on a specific working chamber and a specific valve. Invention Formula A diagnostic system for the operation of a volumetric pump with valve distribution, including electrical pressure and position sensors associated with an instrument for analyzing the sensor signals Formula of the invention in the at least one working chamber of the pump and its discharge manifold, and the position sensor in the drive part of the pump associated with its working member, characterized in that, in order to enhance the functionality of the system by ensuring constant monitoring of the operating state pumping, taking into account changes in the pumping conditions and determining the current value of the volumetric efficiency, the instrument for analyzing The sensor signals are made in the form of a microprocessor system with a clock and a drive, and the electrical sensors are connected to this system using matching elements. Fig 1 B 1 $ 55 AND g XL I Consumption Capes l / V Privatera  ij; 5 bigatel Metric No i Mixture Z / Shpetr Closed -. 100 rev / pin FIG. 6 (Obj p3 (button L o5epa blocks Engine