EP0528726B1 - Verfahren und Vorrichtung zur Steuerung einer Pumpen-Anlage und Nachweiselement für eine derartige Anlage - Google Patents

Verfahren und Vorrichtung zur Steuerung einer Pumpen-Anlage und Nachweiselement für eine derartige Anlage Download PDF

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Publication number
EP0528726B1
EP0528726B1 EP92402286A EP92402286A EP0528726B1 EP 0528726 B1 EP0528726 B1 EP 0528726B1 EP 92402286 A EP92402286 A EP 92402286A EP 92402286 A EP92402286 A EP 92402286A EP 0528726 B1 EP0528726 B1 EP 0528726B1
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EP
European Patent Office
Prior art keywords
pump
support
liquid
pressure
temperature
Prior art date
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Expired - Lifetime
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EP92402286A
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English (en)
French (fr)
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EP0528726A1 (de
Inventor
Michel Kernours
Roger Amand
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Wilo Salmson France SAS
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Pompes Salmson SAS
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Publication of EP0528726A1 publication Critical patent/EP0528726A1/de
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/06—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations specially adapted for stopping, starting, idling or no-load operation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/10—Other safety measures
    • F04B49/106—Responsive to pumped volume
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/02—Stopping of pumps, or operating valves, on occurrence of unwanted conditions
    • F04D15/0209—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the working fluid
    • F04D15/0218—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the working fluid the condition being a liquid level or a lack of liquid supply
    • F04D15/0227—Lack of liquid level being detected using a flow transducer

Definitions

  • the subject of the present invention is a modular element for detecting the flow rate and the pressure in a liquid pipe, comprising a support intended to be placed in thermal contact with the fluid, and on which are fixed a first temperature sensor with variable electrical resistance as a function of temperature, a second temperature sensor with variable electrical resistance as a function of temperature disposed at a distance from the first sensor, and a heating element, said two temperature sensors and said heating element each being connected to at least one member electric and / or electronic control.
  • a control device of this kind is already known for pumps, in which the opening of the discharge valve of the pump is monitored and the pump is stopped after a delay time at start-up if the discharge valve does not don't open.
  • Such a device cannot be used when there is no discharge valve or when it is not accessible and, in general, when it is necessary not to induce pressure losses additional in the discharge line due to the installation of a pump flow regulation system.
  • Experience has also shown that maintaining the opening of the discharge valve is not an absolute criterion for pump discharge.
  • the pump discharge valves when they are dirty or corroded after a long running time of the pump, tend to have a very high hysteresis and to remain in the open position as long as a flow opposite to the backflow does not manifest itself, which leads to keeping the discharge pumps in the running position after the emptying of the tank (s) they control and therefore to the rapid degradation of the pumps thus regulated.
  • the present invention proposes to remedy the drawbacks of known pump control systems, by using pressure and minimum safety flow detectors which do not penetrate the pump discharge line and which are thus more reliable and more faithful. than the detectors used so far, while being more sensitive.
  • the problem underlying the invention is the detection not only of the flow prevailing in a liquid pipe, but also of the pressure. Knowledge of flow and pressure is useful for controlling pumps.
  • the invention provides a modular element for detecting the flow rate and the pressure of the aforementioned type, which further comprises at least one pressure sensor with an electric strain gauge attached. on the support and connected to at least one electrical and / or electronic control member.
  • FIG. 1 a device for regulating the running of a pump (not shown), installed on a section 1 of the discharge pipe of the pump connected to a flange 2 of this section.
  • This partially known device comprises a pressure sensor 3, shown here diagrammatically by a pressure transfer passage 4 and by a bellows 5 carrying an electric switching plate 6 pushed back by a calibrated spring 7 against the effect of the pump discharge pressure.
  • Electrical contacts 8 and 9 are connected to a control member 10 of the electric motor (not shown) of the pump in a provision establishing the electrical circuit also as long as the pump pressure does not exceed a predetermined value.
  • the device 11 for regulating the operation of the pump comprises a sensor 12 for the minimum delivery rate of the pump which does not cause any significant pressure drop during the operation of the pump.
  • the sensor 12 is connected, by a two-conductor cable 13, to the control member 10 of the electric motor of the pump, via a timing member 10 'which does not trigger the possible stopping of the pump motor until after a start-up delay of a few seconds, in the event that the circuit of cable 13 is not closed.
  • the highly sensitive flow sensor 12 here comprises a pallet 14 mounted suspended oscillating around an axis 15 and which projects inside the discharge pipe 1 when no flow passes through this pipe or when the flow which passes through this conduct is very weak.
  • the pallet 14 is mounted inside a housing 16 substantially in the general shape of a segment of a circle extending here substantially over an eighth of a circle.
  • a spring 17 can be placed in abutment on the housing 16 to push the pallet 14 towards the position shown in FIG. 1 when it is biased towards position 14 ′, shown in dotted lines, by the discharge flow which flows in line 1 according to arrow 18.
  • the pallet 14 When a large flow, corresponding to the normal delivery flow of the pump, flows in the direction of arrow 18, the pallet 14 is pushed back against a stop 19 in position 14 ′ and practically disappears completely in the housing 16 thereby eliminating almost all of the additional pressure losses caused by the flow sensor 12.
  • the pallet 14 is extended out of the housing 16 by a contact blade 20 which is capable of establishing the continuity of the electrical circuit between two contacts sliding electrics 21 and 22, each connected to a separate wire from the conductive cable 13.
  • a housing 23 covers the entire sensor pressure 3 and the flow sensor 12, allowing the connection cables to pass through, if necessary in a sealed manner, to the control member 10 of the electric motor.
  • This member 10 can be placed at a distance from the regulation device 11 and close to the electric motor and can be connected to a complex regulation assembly, to a computer for example, as well as to means of remote signaling of an incident.
  • the operation of the pump regulation device 11 shown in FIG. 1 is explained in relation to the diagram in FIG. 2 in order to allow a better understanding of the pump control device according to the invention which will be presented below.
  • the electric motor of the pump is switched on to allow it to start when the operating pressure of the liquid network on which the pump is discharged is below a predetermined value.
  • This minimum pressure value which triggers the starting of the engine is in fact determined by the setting of the spring 7 which causes the support of the switching plate 6 on the two contacts 8 and 9 to establish the continuity of the engine starting circuit.
  • the delay member 10 ′ is then energized and ensures the excitation of the pump run relay for a few seconds corresponding to the duration of speeding up of the rotor of the pump.
  • a normal liquid flow rate is established very quickly according to arrow 18 and the diagram of the pump pressure P as a function of the flow rate Q is established on the value of normal flow rate Q N for a discharge pressure P N.
  • the flow which flows according to arrow 18 rotates the pallet 14 towards its position 14 ′ against the return force of gravity and the return spring 17.
  • the pallet 14 bears on the stop 19 s practically erases the flow circuit without causing any additional pressure drop and establishes, by the contact blade 20, the continuity of the electrical circuit between the sliding contacts 21 and 22.
  • the circuit of the conductive cable 13 then maintains the excitation of the time relay 10 ′ and the pump continues to operate after it has started.
  • the minimum flow rate Q m is not established and, after the delay of start delay of the delay member 10 ′, the powering up of the pump motor is interrupted and an alert or incident signal is triggered.
  • the electromechanical pump control device which has just been described functions correctly in new condition but it has been found to be very sensitive to fouling and corrosion.
  • the paddle flow sensor 12 was first replaced, causing no significant pressure drop during the pump's operation, by a static flow sensor, operating for example according to the principle of gauges. electrical and / or electronic measurement constraint.
  • a static flow sensor operating for example according to the principle of gauges. electrical and / or electronic measurement constraint.
  • Such a sensor represented schematically in Figures 3 and 4 shows no entry into the fluid circuit that is likely to induce leakage or corrosion.
  • These heat dissipation flow sensors consist of a heating element A with substantially constant thermal power and comprising an electrical resistance supplied by a circuit 25 giving off a substantially constant thermal power and which is applied to the metallic external wall of the discharge pipe of the pump, for example using a collar 24 surrounding the discharge line 1.
  • Two temperature measuring members (or sensors) B and B ′ are arranged on said outer wall, respectively a first member B at a distance from the heating element A with respect to the direction of flow 26 of the liquid inside the metal pipe 1 for discharging the pump and a second member B ′, placed downstream or upstream but close to the heating element A, to measure the proximity heating caused by this heating element A.
  • the heating element A and of the two organs B, B ′ for measuring the temperature when the discharge flow of the pump is high, the dissipation of the heat provided by the heating element, by the intermediate of the fluid discharged by the pump, is large and the difference between the temperatures measured by the first B and the second B ′ temperature measuring members is small.
  • the discharge flow rate of the pump when the discharge flow rate of the pump is low or zero, the heat supplied by the heating element A dissipates only slowly and over a large area around this heating element and the difference between the temperature measured by the first organ B and that measured by the second measurement organ B ′ becomes significant, which indicates the non-establishment of the normal delivery flow of the pump.
  • the first temperature measuring member B can, for large diameter delivery pipes, be diametrically opposite the heating element, as shown in dotted lines in the figure with the index (B), which makes it possible to reduce the size along the axis of the discharge line of the pump, external sensors attached by collars or other means on this line.
  • the temperature measuring members B, B ′ can be of any type, in particular consisting of resistors with a negative or positive temperature coefficient which have the advantage of being well integrated into the system for determining the minimum flow rate.
  • Element A with electrical resistance (low power, for example 3 W) can be thermally isolated from the outside environment and applied directly to the wall of the discharge pipe.
  • the second sensor B ' is placed upstream of the heating element A relative to the normal flow direction 26 in this pipe. This has the consequence that, as soon as a low delivery rate occurs in the delivery pipe 1, the surface of the pipe 1 in the vicinity of the sensor B ′ is cooled by the flow (in principle still laminar) of the pumped liquid by the pump. It is of course assumed that the discharge pipe 1 is metallic, for example steel, and has a small thickness, which gives it good thermal conductivity to the outside. Such an arrangement of the sensor B ′ is therefore particularly suitable for capturing low delivery rates.
  • the indication of the establishment of a discharge flow is delayed by the duration necessary to heat the external surface of the discharge pipe at the level of the first sensor B.
  • the sensor B ′ is placed downstream of the heating element, which has the effect, for low flow rates of discharge (with a flow in principle laminar and not turbulent), to bring inside the pipe 1, opposite the second sensor B ′, of the fluid heated by the heating element A and therefore delays the cooling of the second sensor B ′ until the establishment of a turbulent or rapid discharge (for very viscous fluids, the laminar regime persists up to high flow rates).
  • the sensor system according to FIG. 4 is therefore able to ensure that a frank discharge regime has been established at the outlet of the pump.
  • the electrical or electronic information (pulses, voltages, etc.) of the two temperature sensors B and B ′ are transmitted to an electrical and / or electronic comparison circuit 27 which transmits information on the pumping installation establishment or non-establishment of the flow similar to that transmitted by the cable 13 shown in Figure 1.
  • FIG. 5 represents the application of the pump control device to the level regulation of a basin 30 capable of receiving solid matter suspended in a liquid 31 to be evacuated or to be discharged and which can be, in the worst case , a liquid as aggressive as slurry or draining liquid.
  • the discharge pump 32 is immersed in the bottom of the basin 30 and is here driven by an electric motor mounted for example accessible above a cover 34 of the basin, its rotor being connected to the motor by a vertical shaft 35.
  • the dewatering pump 32 is mounted without suction valve and is, for example, placed on the bottom of the basin 30, along its vertical axis, by a suction strainer ring 35 provided with large section openings 35 '.
  • the discharge line 36 of the pump is, for example, removably connected to a discharge circuit 37 permanently mounted and of large section, that is to say not risking blockage by entangled solid materials.
  • a pressure sensor 38 connected to a control member 39 of the pump motor 33 is mounted on the outside in a leaktight and reliable manner.
  • a discharge valve in particular a simplified return discharge valve by gravity such that a ball valve 40 can be provided on the discharge circuit 37 upstream of a discharge pipe 41 to a discharge (to the sewer or to drainage tanks).
  • a removable manhole 42 allows for example to access the ball valve 40 to carry out its maintenance.
  • the pump 32 Since the pump 32 does not have a suction valve (s), the liquid from the basin 30 passes freely through it and the level N of the basin is found practically unchanged in the discharge circuit 37.
  • the sensor 38 which is for example a sensor waterproof and precision static, is in fact capable, by measuring the pressure prevailing in the circuit 37, of indicating the level of the basin 30 when the pump 32 is not operating.
  • the control member 39 of the motor 33 of the pump can be associated with a logic circuit 42 ′ which is capable of sending, by a cable 43, an alert signal when, during a period of stopping of the motor 33, the pressure at the sensor 38 exceeds that corresponding to the normal level N.
  • the pressure sensor 38 indicates to the control member 39 of the pump motor 33 exceeding a first threshold value, which causes the motor to start through a time relay 44.
  • This relay 44 is a safety circuit that stops the pump motor 33 in the safety position (manual reiteration only) or alert when, after the expiration of the delay time (ten seconds for example) at starting the engine 33, the pressure at the sensor 38 in the discharge circuit 37, upstream of the ball valve 40, does not reach a third threshold value corresponding to the normal discharge pressure of the pump, this third threshold value being significantly higher than that corresponding to the normal level N, as a result of pressure losses.
  • a second threshold value is constituted by a value of the pressure at sensor 38 which is very low, that is to say close to atmospheric pressure.
  • the pump is then kept stationary and then, as the basin 30 is filled, the level of the latter is transmitted through the pump to the discharge circuit 37 to come again to request the pressure sensor 38 when he reaches this one.
  • the control circuit and pump regulation according to FIG. 5 it is possible to use a single pressure sensor 38 permanently mounted and sealingly on the discharge circuit 37.
  • the number of sensors must in fact be as small as possible since these are always expensive to install and maintain in good working order and precision, both to monitor the tank level and the operation of the pump in discharge.
  • the tank 30 is only intended to contain liquids little or not loaded with solid products, to monitor the establishment of the pump discharge pressure, it would be possible to use the flow sensor systems shown in Figures 3 and 4 to ensure the safety start of the pump.
  • sensors of any type, electro-mechanical or purely electrical or electronic can be used for the level sensor N of a collection or reserve basin.
  • One type of sensor which has been found to be very reliable for pumping equipment according to the invention consists of an electrical resistor 45, the value of which is clearly variable as a function of temperature and which is housed for example in a tube. protection 46 open at both ends to allow free rise of the liquid inside the tube.
  • the resistor 45 is arranged just at the level N desired for the liquid and is maintained at a temperature above ambient by an electrical circuit with annexed electronic adjustment or with self-regulation.
  • the electric resistance 45 can be supplied with low voltage and may come into direct contact with the liquid discharged by the pump if it is not very conductive, or else it is protected in an insulating sheath which nevertheless ensures cooling energetic when the resistor 45 is immersed in the liquid.
  • the value of the resistance is markedly different when it is in air (level of the reservoir 30 below the level N for example) or in a liquid such as water which causes intense heat dissipation.
  • the deviation of the value of the resistance at room temperature from the hot value of this resistance is checked by a level detection system connected to the resistor 45 by a cable 47 and which does not use moving parts liable to be blocked by corrosion or by the liquid loaded with debris and which is pumped by the installation.
  • a level sensor with heated electrical resistance, immersed or not in the liquid discharged by the pump, depending on whether the set level is reached or not, can be applied to all the control devices of a pumping installation which have just be described and to level control devices of any type.
  • FIG. 6 shows a modular element for detecting the minimum flow rate of liquid in a discharge line, this modular element being able to replace the assemblies of FIGS. 3 and 4 using separate thermometric resistances placed on the discharge line of the pump and connected to electrical and electronic circuits for comparison and excitation.
  • the modular detection element 50 shown in Figure 6 is made from a ceramic support 51, for example a relatively flexible membrane due to its small thickness and on which are deposited by any suitable means, in particular by screen printing followed during cooking, electrical resistances which are highly variable with temperature, with a positive or negative temperature coefficient depending on the case, and which are intended to serve as electrical and / or electronic temperature measurement devices.
  • the membrane 51 is housed in an interface box 49 made of an electrically insulating material and is held in position before mounting of the modular element by a box cover not shown in FIG. 6.
  • the membrane 51 thus carries temperature measuring resistors 52, 53, 54, 55 which can be fixed and permanently integrated on the membrane by baking at temperatures up to 900 ° C. Furthermore, stress measurement resistors or strain gauges 56 are deposited or bonded respectively on the interface box 49 and on the membrane 51. It can be recognized in the diagram of the FIG. 7 of the electrical resistors 56a, 56b, 56c, 56d supplied with a continuous voltage +/- in groups of two to constitute a strain gauge, for example the resistors 56b to 56d are fixed on the interface box 49 while the resistor 56a is fixed on the ceramic membrane 51 to undergo the surface stresses of a discharge line 57.
  • an electrical heating resistor 58 of the same kind as is arranged heating element A that is to say of low power (from 3 to 4 W), and which is supplied according to the diagram of FIG. 7 by a source of direct current +/-.
  • the interface box 49 is closed, preferably in a sealed manner, by an insulating plate 48 placed at a distance from the membrane 51 and which carries electrical connection pins or terminals corresponding in particular to the measurement resistors fixed in the interface box 49.
  • an insulating plate 48 placed at a distance from the membrane 51 and which carries electrical connection pins or terminals corresponding in particular to the measurement resistors fixed in the interface box 49.
  • the terminals 59 to 62 and 64, 65 are connected by cables 59a, 60a, 61a, 62a, 64a, 65a to an electrical control member 10 of a pump delivering on the pipe
  • the connections with the electrical control member 10 are preferably carried out by means of electronic interface detectors, respectively: 10a for detecting the existence of a minimum flow rate in the discharge line 57, 10b for detecting the temperature of the liquid conveyed in the discharge line and 10c for detecting the discharge pressure, that is to say the absolute pressure prevailing in the discharge line 57.
  • the modular detection element 50 contained in the housing interface 49 is protected on the side of the ceramic membrane 51 by a protective cover, not shown in FIG. 6, and which is removed for fixing the membrane to the external surface of the discharge pipe 57.
  • the interface box 49 is also fixed on the external surface of the pipe 57, for example by a lateral bonding line 66. It can be seen in FIG. 6 that the connection between a detection resistor 51 to 56 and the corresponding terminal fixed to the insulating plate 48 is made by a flexible wire (see flexible wire 67 for terminal 60, inside the interface box 49).
  • the latter is fixed by its ceramic membrane 51 and, if necessary, by its interface box 49 to a pipe section 70 capable of being inserted from sealingly between two parts 68 and 69 of the discharge line of a pump (not shown) in order to ensure the continuity of the discharge line.
  • the pipe section 70 equipped with its modular detection element 50 removably fixed or permanently fixed to the central pipe part of reduced thickness, thus constitutes a complete removable detector block which can be inserted on a discharge pipe not suitable for measuring minimum flow and, where appropriate, temperature and pressure, for example because it is too thick or is made of a thermal insulating material (reinforced concrete, insulated metal, synthetic material, etc.).
  • the insertable pipe section 70 shown in FIG. 6 comprises, at each of its ends, mounting flanges 71 and 72 provided with sealing means such as an O-ring 73, 74 and intended to cooperate by means of assembly screws 68a, 69a with corresponding flanges formed at each of the ends of the discharge pipe parts 68, 69.
  • the metal discharge pipe part 57 is formed, for example in a metal that is a good heat conductor such as an aluminum alloy, which quickly takes the temperature of the liquid in transit in the discharge pipe.
  • the pipe part 57 has a reduced thickness, nevertheless ensuring sufficient resistance to the discharge pressure but which causes significant stresses and therefore electrical deformations to appear on the external surface of the pipe under the effect of the discharge pressure.
  • the reduced thickness also allows rapid transmission of the temperature of the liquid discharged by the pump to the external surface of the pipe 57 on which the resistors 52 to 55 are bonded, by means of the thin ceramic support membrane 51 sensitive to temperature and / or to deformations caused by surface stresses.
  • the differential temperature measurement resistors 52 (heated resistance) and 55 to which the respective indices T1 and T2 are assigned are supplied by a source of direct current 65 also used for heating, by means of corresponding adjustment resistors RT1 and RT2.
  • a differential voltage sensor VS2 between terminals 64 and 60 makes it possible to address to the external minimum flow detector 10a a voltage which is, in principle, directly proportional to the temperature difference T1-T2 between temperatures T1 and T2 and which allows, by threshold adjustment, to detect the minimum admissible delivery flow for the pump after start-up.
  • the thermal power of the heating resistor 58 is almost completely dissipated in the discharged liquid and the output signal at the terminals 60, 64 is very weak.
  • the output signal on the terminals 61 makes it possible to know at any time the temperature on the external surface of the pipe 57 and to possibly act when this temperature is too high, which indicates an exaggerated temperature of the fluid discharged by the pump.
  • the bridge for measuring the discharge pressure of the liquid in the pipe 57 is produced using the resistors 56 to which temperature compensation elements are added, where appropriate: a resistor RP mounted in parallel with the resistor 56c, a resistor RS in series with the resistor 56a and, if necessary, a resistor RM mounted between the two midpoints of the two branches of the measuring bridge.
  • the temperature compensation resistors are necessary if the temperature on the surface of the pipe 57 is liable to vary within large amplitudes.
  • the output signal VS1 picked up at the terminals 62 is sent to the pressure detector block 10c.
  • the second embodiment of the electrical circuits of the modular element 50 differs from that of FIG. 7 essentially in that it comprises, for the measurement of the minimum flow, a double bridge of resistors which allows to measure with greater sensitivity differential variations in sensor temperature caused by the discharge flow rate in line 57.
  • two temperature measurement resistors 52 and 75 (denoted T1, T4) are heated simultaneously by a common heating resistor 58 ′ and are supplied by a continuous current source +/- (terminals 65) in series each with a respective unheated temperature measurement resistor 76 and 55.
  • the differential voltage sensed is thus a function of the temperature differences T1.T2-T3.T4 and allows better identification of the relative overheating of the heated resistors 52 and 75.
  • the mounting of the electrical circuits of the modular element 50 according to the diagram in FIG. 8 is useful, in particular when the fluid circulating in the discharge line 57 (for example hot heating water), is likely to be very hot compared to the ambient.
  • the fluid circulating in the discharge line 57 for example hot heating water
  • the modular detection element 50 is tightly integrated into a section of pipe 70 which, like the section 70 of Figure 6, is inserted in a sealed manner between two parts 68, 69 of the discharge line of a pump (not shown).
  • the section 70 can, for example, be made of molded plastic (machined for small series) of great thickness to receive the sensor support according to the invention.
  • a passage 77 is formed perpendicular to the wall of the pipe section by forming an annular shoulder 78 on which the edge (coated with an elastomeric seal 79) is applied to a support 80 of generally planar shape (and here circular) for the sensors: temperature 55, differential temperature 52 for measuring the minimum flow rate and stress (strain gauge not shown) with electrical resistances.
  • the support 80 preferably consists of a relatively thin ceramic disc (thickness of the order of 1 mm) which conducts heat well and which has a diameter preferably between 15 and 30 mm.
  • An advantageous support has been found to have a diameter of 18 mm and its "exposed" central part, which remains free after the application of the elastomeric seal 79 on the shoulder 78 by the tightening effect of a rigid tightening ring 81 , then had a diameter of 10 mm.
  • the simple temperature sensors 55 and differential (heated) 52 are also deposited by screen printing and fixed by baking at 900 ° C. on the flat outer surface of the support 80 in the "exposed” area. 10 mm in diameter, at a distance from each other, but at a distance of less than 10 mm, which is however sufficient to show the heating effect on the differential sensor 52.
  • the active resistance 56a (subjected to tensile or compressive stresses) of the strain gauge 56 is generally placed in the center of the exposed area where the maximum flexural stresses exist on the ceramic support 80 of approximately 1 mm d thickness, pinched over its entire periphery by the rigid ring 81 screwed for example into a threaded bore of the passage 77.
  • the connecting wires of the electrical resistances of the sensors deposited on the support 80 are housed in a sheath 82 at the outlet of the modular detection element 50 and they terminate in a coupler 83 ensuring, in a withdrawable manner, the connection interface with cables 60a, 64a to the minimum flow detector 10a, with the cable 61a to the liquid temperature detector 10b and with the cables 62a for detecting the discharge pressure.
  • the modular detection element 50 is generally produced in the form of a short, removable block which can be inserted into the discharge line 68, 69 by flanges or else can be screwed onto corresponding end pieces of the discharge pipe, the connection to the electrical control member 10 being effected by the withdrawable coupler 83.
  • the large wall thickness of the section 70 makes it possible to use, for this section, a block of inexpensive molded plastic material which withstands the temperatures of hot water in a central heating circuit without damage.
  • the circuits of FIGS. 7 and 8 are, of course, applicable (in a miniaturized form) on the support 80 with a diameter of 15 to 30 mm shown in FIG. 9.
  • the modular element 50 which forms an interchangeable block up to the withdrawable coupler 83 may include, in certain applications, a support 80 removable to the coupler 83. In the event of failure of the electrical and / or electronic circuits mounted on the support 80, this is then extracted after unscrewing or removing the ring 81 and is replaced by another support 80 cooperating with the peripheral elastomer seal 79. Given the fragility of the measurement resistors 52 to 56 and the difficulties in coupling them to the pump control member 10, most applications however provide for the complete exchange of the modular detection element 50 with its pipe section 70.
  • the control devices of a pumping installation delivering on a network or else controlling the level of a capacity filled or emptied by the pump can use the modular detection element 50 fixed on a discharge pipe and connected to a electric control 10 or else the modular block consisting of the pipe section 70 permanently carrying the modular block 50 detachably connected to the control member 10, to replace the device 11 shown in FIG. 1.
  • the method and the device for controlling a pumping installation according to the invention, as well as the modular detection element which relates thereto, have been illustrated for a pump driven by a electric motor, which is the most common case, but they can, of course, be applied to pumps driven by other motors, such as heat engines.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Reciprocating Pumps (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Claims (6)

  1. Modulares Element zum Erfassen von Durchsatz und Druck in einer Flüssigkeitsleitung, umfassend: einen Träger (51, 80), der mit dem Fluid in Thermokontakt zu bringen ist, und auf dem ein erster Temperaturfühler (55) mit einem elektrischen, als Funktion der Temperatur veränderlichen Widerstand, und ein zweiter Temperaturfühler (52) mit einem elektrischen, als Funktion der Temperatur veränderlichen Widerstand, der mit Abstand von dem ersten Fühler (55) angebracht ist, sowie ein Heizelement (58) befestigt sind, wobei die beiden Temperaturfühler (52, 55) und das Heizelement (58) jeweils mit mindestens einem elektrischen und/oder elektronischen Steuerorgan (10) verbunden sind,
    dadurch gekennzeichnet,
    daß es außerdem mindestens einen Druckfühler mit elektrischer Dehnungsmeßeinrichtung (56) aufweist, der an dem Träger (51, 80) befestigt und mit mindestens einem elektrischen und/oder elektronischen Steuerorgan (10) verbunden ist.
  2. Modulares Element nach Anspruch 1,
    dadurch gekennzeichnet,
    daß es mittels seines Trägers (56, 51) und gegebenenfalls eines Schnittstellengehäuses (49) an einem Leitungsschuß (70) befestigt ist, welcher abgedichtet zwischen zwei Teile (68, 69) der Flüssigkeitsleitung eingefügt werden kann, um deren Durchgängigkeit zu gewährleisten, und welcher aus einem Material guter Wärmeleitfähigkeit hergestellt ist, um mit dem Leitungsschuß (70) zusammen einen Einsetzblock zum Erfassen des Durchsatzes und gegebenenfalls der Temperatur und des Drucks der Flüssigkeit zu bilden, die durch die Flüssigkeitsleitung (68, 69) gefördert wird.
  3. Modulares Element nach Anspruch 2,
    dadurch gekennzeichnet,
    daß der Träger (51, 57) und gegebenenfalls ein Zwischengehäuse (49) dauerhaft an dem Leitungsschuß (70) befestigt sind, um einen lösbaren Einsatzblock zum Erfassen des Durchsatzes, des Drucks und gegebenenfalls der Temperatur der in der Flüssigkeitsleitung geförderten Flüssigkeit zu bilden.
  4. Modulares Element nach Anspruch 2 oder 3,
    dadurch gekennzeichnet,
    daß der Leitungsschuß (70) zwei Enden (71, 72) zum dichten Einsetzen in die Flüssigkeitsleitung (68, 69) und zwischen den zwei Enden mindestens einen Leitungsabschnitt (57) verringerter Dicke aufweist, welcher unter dem Einfluß des Flüssigkeitsdrucks signifikante Zug- oder Druckdehnungen erfahren kann, und daß der Träger (51) aus einer Keramikmembran (51) gebildet ist, die an der Außenfläche des Leitungsabschnitts (57) angeklebt oder anderweitig befestigt ist.
  5. Modulares Element nach Anspruch 1,
    dadurch gekennzeichnet,
    daß es durch einen Leitungsschuß (70) gebildet wird, der abgedichtet zwischen zwei Abschnitte (68, 69) der Flüssigkeitsleitung eingesetzt werden kann, um deren Kontinuität zu gewährleisten, und dessen Wand von einem Durchlaß (77) durchsetzt wird, der in Querrichtung von dem im wesentlichen ebenen Träger (80) verschlossen wird, der abgedichtet an seinem Umfang auf eine in dem Durchlaß ausgebildete Anlage-Ringschulter aufsetzbar ist, um auf dem Träger (80) eine zentrale Zone einzugrenzen, die innenseitig in direkter Berührung mit der geförderten Flüssigkeit steht, und die außenseitig die Fühler (52, 55) und die Widerstands-Dehnungsmeßeinrichtung trägt, die auf dem Träger (80) integriert sind, welcher aus einem Material guter Wärmeleitung mit einer Dicke ausgebildet ist, die in der zentralen Zone dem Flüssigkeitsdruck der Flüssigkeit zu widerstehen vennag, die nichts desto weniger auf die zentrale Zone des Trägers spürbare Zug- und/oder Druckdehnungen ausübt.
  6. Modulares Element nach Anspruch 5,
    dadurch gekennzeichnet,
    daß der Umfang des Trägers (80) zumindest auf einer Dichtung (79) ruht, die zwischen der Ringschulter (78) des Durchlaßes (77) und dem Träger (80) eingefügt ist, und daß ein in Anlage mit dem Körper des Rohrschusses (70) liegender starrer Druckring (81) den Träger (80) gegen die Schulter drückt.
EP92402286A 1991-08-16 1992-08-13 Verfahren und Vorrichtung zur Steuerung einer Pumpen-Anlage und Nachweiselement für eine derartige Anlage Expired - Lifetime EP0528726B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9110379A FR2680393A1 (fr) 1991-08-16 1991-08-16 Procede et dispositif de commande d'une installation de pompage.
FR9110379 1991-08-16

Publications (2)

Publication Number Publication Date
EP0528726A1 EP0528726A1 (de) 1993-02-24
EP0528726B1 true EP0528726B1 (de) 1996-04-10

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EP92402286A Expired - Lifetime EP0528726B1 (de) 1991-08-16 1992-08-13 Verfahren und Vorrichtung zur Steuerung einer Pumpen-Anlage und Nachweiselement für eine derartige Anlage

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EP (1) EP0528726B1 (de)
AT (1) ATE136626T1 (de)
DE (1) DE69209746T2 (de)
FR (1) FR2680393A1 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20020275A1 (it) * 2002-02-13 2003-08-13 Schneider Electric Ind Italia Dispositivo di comando per il funzionamento di una pompa autoclave diuna rete di distribuzione d'acqua
ES1053407Y (es) * 2002-12-18 2003-07-16 Bogemar Sl Electrobomba multicelular.
FR2857448B1 (fr) * 2003-07-08 2005-12-02 Pompes Salmson Sa Detecteur et procede de detection de debit par dissipation thermique
EP1775476A1 (de) * 2005-10-13 2007-04-18 Alessio Pescaglini Steuervorrichtung für Motorpumpenaggregat
DE102015119832A1 (de) * 2015-11-17 2017-05-18 Xylem Ip Management Sàrl Förderpumpe zur Druckerhöhung in einer Leitung und Verfahren zum Betreiben einer Förderpumpe
IT201600082411A1 (it) * 2016-08-04 2018-02-04 Enrico Raddi Inverter per impianti idrici, circuito di controllo di quest'ultimo e metodo associato
IT201600082976A1 (it) * 2016-08-05 2018-02-05 Enrico Raddi Pressoflussostato per impianti di recupero acqua piovana
CN107575416B (zh) * 2017-10-19 2024-03-26 江苏国泉泵业制造有限公司 一种带冲洗控制的排污泵防堵进水管道
DE102018208140B3 (de) 2018-05-24 2019-06-13 Continental Automotive Gmbh Pumpenvorrichtung und Verfahren zum Ermitteln eines Kühlmittelmassenstroms durch eine Pumpenvorrichtung einer Brennkraftmaschine
CN108626104B (zh) * 2018-06-22 2024-04-30 佛山科学技术学院 一种防抽空装置

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FR828814A (fr) * 1937-02-04 1938-05-31 Fond Perfectionnement aux disposement aux dispositifs assurant l'arrêt des pompes centrifrêt du courant d'eau dans leurs canalisations de refoulement ou aspiration
FR934793A (fr) * 1946-08-07 1948-06-01 Procédé et dispositif pour la commande automatique de motopompes et pour la protection contre la marche à vide des pompes en cas de désamorçage
US3438254A (en) * 1965-10-19 1969-04-15 United Control Corp Fluid flow detector
US4255968A (en) * 1979-06-08 1981-03-17 Intek, Inc. Flow indicator
EP0074574A1 (de) * 1981-09-14 1983-03-23 The Perkin-Elmer Corporation Durchflussdruckwandler
FR2649429A1 (fr) * 1989-07-10 1991-01-11 Louis Marc Dispositif de commande de vidange pour appareils sanitaires
WO1991019170A1 (en) * 1990-06-04 1991-12-12 Mcpherson's Limited Flow sensor and control system

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Publication number Publication date
EP0528726A1 (de) 1993-02-24
FR2680393B1 (de) 1995-05-24
DE69209746T2 (de) 1996-08-08
DE69209746D1 (de) 1996-05-15
FR2680393A1 (fr) 1993-02-19
ATE136626T1 (de) 1996-04-15

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