EP1336761A2 - Dispositif de contrôle pour une pompe d'autoclave - Google Patents

Dispositif de contrôle pour une pompe d'autoclave Download PDF

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Publication number
EP1336761A2
EP1336761A2 EP03075340A EP03075340A EP1336761A2 EP 1336761 A2 EP1336761 A2 EP 1336761A2 EP 03075340 A EP03075340 A EP 03075340A EP 03075340 A EP03075340 A EP 03075340A EP 1336761 A2 EP1336761 A2 EP 1336761A2
Authority
EP
European Patent Office
Prior art keywords
pump
flow
control device
pressure
chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP03075340A
Other languages
German (de)
English (en)
Other versions
EP1336761A3 (fr
Inventor
Claudio Pesenti
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schneider Electric Industrie Italia SpA
Original Assignee
Schneider Electric Industrie Italia SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Schneider Electric Industrie Italia SpA filed Critical Schneider Electric Industrie Italia SpA
Publication of EP1336761A2 publication Critical patent/EP1336761A2/fr
Publication of EP1336761A3 publication Critical patent/EP1336761A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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
    • F04B49/02—Stopping, starting, unloading or idling control
    • F04B49/022—Stopping, starting, unloading or idling control by means of pressure
    • 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
    • F04B2205/00—Fluid parameters
    • F04B2205/05—Pressure after the pump outlet
    • 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
    • F04B2205/00—Fluid parameters
    • F04B2205/09—Flow through the pump
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/247—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow the switch being of the reed switch type
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/40—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by devices allowing continual flow of fluid, e.g. vane
    • H01H35/405—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by devices allowing continual flow of fluid, e.g. vane the switch being of the reed switch type

Definitions

  • the present invention relates to a control device for operation of an autoclave pump of a water distribution network.
  • pressure flow switches are able to replace all the elements normally utilized in a hydraulic circuit where there is a pump.
  • each pressure flow switch has a check valve, a pressure switch, a hydro-pneumatic accumulator and a level switch.
  • a pump controlled by a pressure switch is activated upon reaching a first predetermined value (low pressure) and deactivated upon reaching a second value corresponding to a high pressure; in this way, the life of the pump motor decreases as it is subjected to considerable stress by starting up and shutting down repeatedly.
  • Pressure flow switches in use are able to obviate all this thanks to the fact that they are designed to control not only pressures, but also flow rates, ensuring that the pump continues to operate for as long as the user continues to draw water.
  • a pressure flow switch of the traditional type designed to control switching on and switching off of a pump installed in a water distribution network comprises, inside the body, a chamber, with an inlet duct designed to be connected to the pump outlet side and an outlet duct designed to be connected to the water network, a control valve, provided on the inlet duct, and a pressure sensor, positioned inside the chamber and capable of sending a signal to switch on the pump if a predetermined pressure value is reached inside the chamber.
  • a device of this type also comprises a flow sensor, located on the outlet duct and designed to send a signal to switch on the pump if the flow of fluid circulating reaches a minimum predetermined value; in this case, when water is drawn from at least one of the user terminations, with the water intake valve to the water network open, an electric signal is sent to the pump to keep it switched on, even if the pressure inside the pump body exceeds a predetermined value dependent on the setting of the pressure sensor.
  • the use of the flow sensor prevents the pump from switching on and off repeatedly, if the quantity of flow drawn at the user terminations are about the same as the capacity of the pump and, consequently, the pressure value inside the pump body is about the same as the pressure value utilized to set the pressure sensor.
  • the flow sensors currently utilized only detect whether or not there is a specific flow rate, but are unable to measure the extent of the flow; moreover, it is currently necessary to produce different models of pressure flow switches, with different sensitivities, in order to adapt each device to the performances of the various types of pump; this makes it necessary to modify each project individually to take account of the variation in setting of the flows circulating inside the pressure flow switch, with the inevitable consequences deriving from the fact that each device must be manufactured according to particular project specifications.
  • the object of the present invention is, therefore, to eliminate the technical drawbacks mentioned, by producing a control device for operation of an autoclave pump of a water distribution network which makes it possible to measure pressures and flows and therefore to vary the setting of flows simply by adjusting some constants of software installed in the microprocessor.
  • Another object of the invention is to produce a control device for operation of an autoclave pump of a water distribution network which makes it possible to have different models of pressure flow switches with different sensitivities, so that the device may be adapted to the performances of different types of pump.
  • Yet another object of the invention is to produce a control device for operation of an autoclave pump of a water distribution network which is capable of preventing the pressure oscillation typical of pressure switches and the pump from starting up and shutting down repeatedly and which is also capable of detecting, thanks to a microprocessor logic, any abnormal conditions that take place, such as excessive flow, no water at the pump inlet side or a leak in the user circuit, in this case shutting down the entire system to prevent damage to the pump and/or internal circuits.
  • Yet another object of the invention is to produce a control device for operation of an autoclave pump of a water distribution network which allows the remote control of pump operation, providing the customer with useful information on the state of the system.
  • Yet another object of the invention is to produce a control device for operation of an autoclave pump of a water distribution network which is substantially simple, safe and reliable.
  • control device utilizes a chamber, inside which water flows through a duct connected to the pump; the water flows from the outlet side towards the user.
  • the device is capable of measuring the flow circulating, by means of a turbine, and the pressure, by means of a mechanical assembly composed of a diaphragm and a spring.
  • All the signals which are detected by means of reed contacts and magnets, are sent to an electronic control system, completely isolated from the circulating fluid, and to the remote control, by the microprocessor.
  • the device according to the invention also has a check valve and a safety valve.
  • the pump is activated if the pressure drops below a first predetermined value or if the flow rate increases above a specific value; moreover, the pump is deactivated if the pressure increases above a certain value and if the flow rate drops to a specific value.
  • the pressure flow switch in question may also shut down the pump if there is no water, if there are small leaks or excessive flows; all these alarms can be excluded at the discretion of the user.
  • control device can also be controllable by a remote control and has an isolating transformer in its power supply, to protect the system from overvoltages.
  • the autoclave pump is connected to the inlet duct 12 of the control device according to the present invention, while the user circuit is connected to the outlet duct 1, so that the flow of water delivered by the pump flows through the device from one end to the other.
  • the pressure is controlled in the following way.
  • the electric-electronic management circuit 8 is housed inside an electric box 8A, which remains completely isolated from the fluid circulating in the control device, so as to avoid unwanted faults and/or malfunctions in the microprocessor management logic, caused by the operating temperatures of the device, the relative humidity, any vibrations or thermal shocks.
  • the diaphragm 10-spring 9 assembly also forms a small spring-loaded accumulator, able to accumulate a predetermined quantity of water (about 200 cc).
  • the flow of circulating liquid is also detected in the following manner.
  • a second magnet 4 fixed to the turbine 2 rotates with it and causes a second reed contact, indicated with 5 in figure 1, to close and open with each turn of the turbine 2.
  • the electronic logic is therefore able to measure the flow, monitor the trend and consequently decide whether to keep the pump switched on or to switch it off, also taking account of the pressures inside the system.
  • vent of the chamber 16 which houses the spring 9 is provided with a safety valve 3, which closes the vent if there is a flow of water inside the chamber 16 caused, for example, by breakage of the diaphragm 10; in this way, in the event of breakage, indiscriminate leakage of water and consequent flooding of the room are avoided.
  • the check valve 11 prevents the water from flowing towards the pump when the latter is shut down, so that the chamber 7 and the user circuit may remain pressurized, even when the pump is switched off, thanks to the thrust of the spring 9 on the diaphragm 10.
  • the electric box 8A to house the printed circuit 8, connected to the power mains and to the pump, which supervises management of the overall operation of the device, is fixed.
  • the electronic logic provided decides whether or not to supply the pump with power according to the pressure and flow values detected and measured and according to the delays found between the variations in pressure and flow.
  • the flow sensor according to the invention is substantially composed of the turbine 2, disposed on the outlet duct 1 of the device, while the pressure sensor, of the diaphragm type, is positioned inside the chamber 7 of the body 17.
  • the pressure sensor comprises the diaphragm 10 which delimits the chamber 7 and which is operated by the pressure inside the chamber 7; the diaphragm 10, substantially ring-shaped, is provided with the shaft or central stem 14 which is mobile and extends horizontally towards the inlet duct 12 of the pump.
  • the diaphragm 10 is then subjected to the action of the counter spring 9 and is deformable (as can be seen in figure 1) as a result of the pressure existing inside the chamber 7, after the elastic force of the spring 9 has been overcome.
  • the pressure sensor includes the magnet 13, associated with the shaft 14, and the reed contact detector 6, associated with the printed circuit 8, designed to detect the position of the aforesaid shaft 14.
  • the magnet 13 and the contact 6 are facing each other and interact with each other at a predetermined pressure value existing inside the chamber 7, while they are spaced apart at greater pressure values to the predetermined one; moreover, in the condition in which the magnet 13 and the contact 6 are facing each other, the pressure sensor emits a signal, through the electronic logic, to enable pump switch-on.
  • the flow sensor of the control device comprises the turbine 2, rotating as a result of the flow of water circulating in the outlet duct 1, and a second position detector, composed of the magnet 4, associated with the turbine 2, and of the reed contact 5, associated with the printed circuit 8 and able to interact with the magnet 4.
  • Operation of the control device for operation of an autoclave pump of a water distribution network is substantially as follows.
  • the flow of water moreover, causes the check valve (or input valve) 11 to open, so that the water flows into the chamber 7 of the body 17.
  • the decrease in pressure inside the chamber 7 causes deformation of the diaphragm 10, as the counter spring 9 is released, and return of the shaft 14 to a position in which the reed contact 6 and the magnet 13 interact with each other; at this point, mutual interaction between the contact 6 and the magnet 13 make it possible to automatically send, through the associated electronic circuit, a signal to the motor of the pump to switch it on.
  • the direct causes for which the pump is operated are determined by the fact that inside the chamber 7 of the body 17 a minimum predetermined pressure value is reached or a minimum predetermined flow value is reached; the position detector composed of the magnet 4 and the contact 5 provided on the turbine 2 at the outlet duct 1, is also utilized to keep the pump operating, even if the magnet 13-contact 6 assembly, associated with the pressure sensor, does not interact (for example, due to a further increase in pressure in the chamber 7).
  • the position detector provided on the turbine 2 is also able to ensure correct shut-down of the pump in the conditions in which the pressure inside the chamber 7 is greater than a specific predetermined value and the quantity of outflowing water is below a predetermined value.
  • the pump is therefore started up according to the detection and measurement of pressure and flow and starts up if the pressure is below a predetermined value or if the flow is above a further predetermined value; shut-down of the pump is also influenced by pressure and flow, in the sense that the pump is shut down if the pressure exceeds a predetermined value and if the flow is below a further predetermined value.
  • the electronic logic inside the device senses that there is no water at the pump inlet side and stops the pump, shutting down the system; at this point the user may reset the system using a specific reset button.
  • the electronic management logic also supervises the time lapse between one start-up and the next during normal operation; in practice, when a certain number of consecutive start-ups which are short-lasting and close to one another are detected, the electronic logic stops the pump due to the leaks found in the user circuit and shuts down the system; once again the user may rid the system of the alarm condition using the reset button.
  • a third alarm provided is the maximum flow alarm; in fact, if the flow rate reaches a predetermined value (for example, 100 l/min) and remains for a certain period of time at a value greater than or equal to this, the alarm cuts it and shuts down the pump; once again the reset button can be used to remove the alarm condition.
  • a predetermined value for example, 100 l/min
  • the device is provided with a panel with a series of LEDs to indicate the presence of the power supply, pump operating and pump shut down and a reset button that can be used to restore the pump to operation.
  • the electric-electronic management circuit for total operation of the control device is composed of a feed section, a logic section, a driver relay and reed sensors.
  • the object of the power supply section is to provide, through the use of a transformer 21 and a rectifier 22, a voltage of 12 volts designed to supply the relay 20, a possible remote interface 23 and the LEDs 24, 25, respectively indicating pump operation and mains power supply.
  • the section 30 also generates a voltage of 5 volts stabilized, by means of a specific stabilizer 26, which is used to supply the management microcontroller 27 and at least an alarm LED 28, and a possible analogue output 29.
  • the electronic operating logic of the control device is imparted by the microcontroller 27 by means of a series of commands or impulses sent to a latch; for example, following a "PUMP ON” command, the pump remains on until the next "PUMP OFF” command, even if the start-up condition ceases (that is, even if the pressure inside the chamber 7 increases above a maximum value).
  • the no water, leak and excessive flow alarms shut down the pump and activate a LED 28; in this case, the logic is restored from the shut-down state when a reset button is pressed.
  • timers TIMER1, TIMER2, TIMER4
  • COUNTER3 one counter
  • TIMER1 starts its count when the logic condition to switch off the pump is reached (that is, high pressure and low flow) and only switches off the pump if this condition is maintained for the full count time; the timer is then reset (and therefore the pump continues to be supplied) if the start-up condition (that is, low pressure or flow above a certain value) is restored during the count and when the pump restarts for normal use.
  • TIMER2 starts to count each time there is the condition (low flow) AND (low pressure) and is reset with the condition (low flow) AND (high pressure); if the timer reaches the end of the count, a no water alarm is emitted and the pump shuts down until the reset button is pressed.
  • the COUNTER3 increases each time the pump starts up, the counter is reset if the pump remains on for more than 20 seconds; if the counter counts 30 short-lasting start-ups close to one another, a leak alarm is emitted and the pump is shut down until being subsequently reset.
  • the TIMER4 starts counting when the flow delivered reaches 100 l/min and shuts down the pump if the flow remains greater than or equal to 100 l/min for 5 seconds.
  • the device is also designed to conform with the current European regulations on this subject.
  • control device thus conceived may undergo numerous modifications and variants, all falling within the invention and all parts may be replaced with technically equivalent elements, just as the materials utilized and the dimensions may vary according to technical requirements.
  • a remote control which controls pump operation at a distance, provides the customer with useful information on the state of the system and warns, by an acoustic signal (buzzer, which may be disabled at the discretion of the user) of any faults.
  • the remote control suitable for wall-mounting, may be positioned at a maximum distance of 50 metres from the pressure flow switch and can be used to switch the pump on and off, start up or reset the system and monitor the state by means of viewing the parameters on a liquid crystal display.
  • the dialogue between the microcontroller of the remote control and the microcontroller of the control device takes place by cable, through serial transmission and dedicated protocol.
  • the remote control comprises an interface module and the actual remote control.
  • the interface module is composed of a serial communication card which is added to the control device to transmit data and commands from the microprocessor 27 to the remote control and vice versa; it also supplies power to the remote control and is housed inside the electric box 8A and connected directly to the printed circuit by means of a specific connector.
  • the remote control is a command and control module for the pump, which dialogues with the microprocessor 27 of the control device of the pump by cable, through an interface module; it is provided with a liquid crystal display, on which to view information concerning the state of the pump (power supply, pump operating, pump enabled), with a buzzer and relative visual indicators to warn the user of an alarm (no water, leak in the circuit, excessive flow) and the necessary control buttons (pump enabling, reset, acoustic alarm exclusion).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Ropes Or Cables (AREA)
EP03075340A 2002-02-13 2003-02-05 Dispositif de contrôle pour une pompe d'autoclave Withdrawn EP1336761A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2002MI000275A ITMI20020275A1 (it) 2002-02-13 2002-02-13 Dispositivo di comando per il funzionamento di una pompa autoclave diuna rete di distribuzione d'acqua
ITMI20020275 2002-02-13

Publications (2)

Publication Number Publication Date
EP1336761A2 true EP1336761A2 (fr) 2003-08-20
EP1336761A3 EP1336761A3 (fr) 2009-06-10

Family

ID=11449210

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03075340A Withdrawn EP1336761A3 (fr) 2002-02-13 2003-02-05 Dispositif de contrôle pour une pompe d'autoclave

Country Status (3)

Country Link
EP (1) EP1336761A3 (fr)
CN (1) CN1438373A (fr)
IT (1) ITMI20020275A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITFI20080235A1 (it) * 2008-12-04 2010-06-05 Enrico Raddi "un gruppo regolatore per pilotare una elettropompa di alimentazione di una rete locale di distribuzione di un liquido"
ITFI20120079A1 (it) * 2012-04-20 2013-10-21 Trevi Engineering S R L Unipersona Le "apparecchio per il controllo dell'avviamento e dell'arresto di una pompa di una rete di distribuzione idrica"
RU2616397C1 (ru) * 2016-01-19 2017-04-14 Владимир Николаевич Павлов Устройство контроля и управления насосом
IT201600082296A1 (it) * 2016-08-04 2018-02-04 Enrico Raddi Pressoflussostato migliorato
WO2020232508A1 (fr) 2019-05-22 2020-11-26 White International Pty Ltd Dispositif de commande de pompe

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20070113302A (ko) * 2005-03-24 2007-11-28 페더럴-모걸 코오포레이숀 부직 요소를 결합한 기판
BE1018442A3 (nl) * 2009-11-30 2010-11-09 Wiele Michel Van De Nv Werkwijze voor het vervaardigen van tapijten met franjes, weefsels en tapijten volgens deze werkwijze vervaardigd.
CN103966764A (zh) * 2014-04-04 2014-08-06 南通华普工艺纺织品有限公司 一种地毯的编制方法
CN107581997B (zh) * 2016-07-07 2024-05-21 青岛海尔洗碗机有限公司 一种洗碗机防干烧装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991019170A1 (fr) * 1990-06-04 1991-12-12 Mcpherson's Limited Detecteur de debit et systeme de commande
EP0528726A1 (fr) * 1991-08-16 1993-02-24 POMPES SALMSON Société Anonyme à directoire dite: Procédé et dispositif de commande d'une installation de pompage et élément modulaire de détection pour une telle installation
EP0819851A2 (fr) * 1996-07-19 1998-01-21 GARDENA Kress + Kastner GmbH Dispositif de commande pour une pompe d'alimentation ou similaire
DE19930546C1 (de) * 1999-06-29 2000-06-21 Melagapparate Gmbh & Co Kg Dampfsterilisator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991019170A1 (fr) * 1990-06-04 1991-12-12 Mcpherson's Limited Detecteur de debit et systeme de commande
EP0528726A1 (fr) * 1991-08-16 1993-02-24 POMPES SALMSON Société Anonyme à directoire dite: Procédé et dispositif de commande d'une installation de pompage et élément modulaire de détection pour une telle installation
EP0819851A2 (fr) * 1996-07-19 1998-01-21 GARDENA Kress + Kastner GmbH Dispositif de commande pour une pompe d'alimentation ou similaire
DE19930546C1 (de) * 1999-06-29 2000-06-21 Melagapparate Gmbh & Co Kg Dampfsterilisator

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITFI20080235A1 (it) * 2008-12-04 2010-06-05 Enrico Raddi "un gruppo regolatore per pilotare una elettropompa di alimentazione di una rete locale di distribuzione di un liquido"
ITFI20120079A1 (it) * 2012-04-20 2013-10-21 Trevi Engineering S R L Unipersona Le "apparecchio per il controllo dell'avviamento e dell'arresto di una pompa di una rete di distribuzione idrica"
EP2653725A1 (fr) * 2012-04-20 2013-10-23 Trevi Engineering S.r.l. Unipersonale Appareil permettant de commander le démarrage et l'arrêt d'une pompe d'un réseau de distribution d'eau
RU2616397C1 (ru) * 2016-01-19 2017-04-14 Владимир Николаевич Павлов Устройство контроля и управления насосом
IT201600082296A1 (it) * 2016-08-04 2018-02-04 Enrico Raddi Pressoflussostato migliorato
WO2020232508A1 (fr) 2019-05-22 2020-11-26 White International Pty Ltd Dispositif de commande de pompe
EP3973192A4 (fr) * 2019-05-22 2023-05-31 White International Pty Ltd Dispositif de commande de pompe

Also Published As

Publication number Publication date
EP1336761A3 (fr) 2009-06-10
CN1438373A (zh) 2003-08-27
ITMI20020275A1 (it) 2003-08-13
ITMI20020275A0 (it) 2002-02-13

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