EP2396554A1 - Dispositif de commande pour une pompe d'alimentation en liquide - Google Patents

Dispositif de commande pour une pompe d'alimentation en liquide

Info

Publication number
EP2396554A1
EP2396554A1 EP10740829A EP10740829A EP2396554A1 EP 2396554 A1 EP2396554 A1 EP 2396554A1 EP 10740829 A EP10740829 A EP 10740829A EP 10740829 A EP10740829 A EP 10740829A EP 2396554 A1 EP2396554 A1 EP 2396554A1
Authority
EP
European Patent Office
Prior art keywords
pressure
housing
liquid
liquid supply
controller
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Withdrawn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
EP10740829A
Other languages
German (de)
English (en)
Other versions
EP2396554A4 (fr
Inventor
Joel Dylan Gresham
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.)
Davey Water Products Pty Ltd
Original Assignee
Davey Water Products Pty Ltd
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
Priority claimed from AU2009900606A external-priority patent/AU2009900606A0/en
Application filed by Davey Water Products Pty Ltd filed Critical Davey Water Products Pty Ltd
Publication of EP2396554A1 publication Critical patent/EP2396554A1/fr
Publication of EP2396554A4 publication Critical patent/EP2396554A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • F04B49/08—Regulating by delivery 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
    • 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
    • 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
    • F04B49/06—Control using electricity
    • F04B49/065—Control using electricity and making use of computers
    • 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

Definitions

  • the present invention relates to a controller for operating an electrically driven pump associated with a liquid supply system. It also relates to a method for pressurising a liquid supply in a liquid supply system.
  • the invention is applicable for example to a water supply system in which water is drawn from a source of water, for example a holding tank, dam, reservoir or the like, and is supplied under pressure for household, farm, commercial or industrial use.
  • a source of water for example a holding tank, dam, reservoir or the like
  • the invention will be described with reference to its use in a water supply system, however it could also be used in other liquid supply systems.
  • Households that are not connected to a municipal (mains) water supply may rely upon water supplied from a storage tank and pressurised by a pump.
  • the pump may be activated by a controller which uses detection of pressure to switch the pump on and off, for example two pressure thresholds may be set, that is an upper threshold at which the pump is switched off and a lower or "cut-in" threshold at which the pump is switched on.
  • two pressure thresholds may be set, that is an upper threshold at which the pump is switched off and a lower or "cut-in" threshold at which the pump is switched on.
  • the difference between the two thresholds is relatively large, the pressure fluctuation in the water supply system may be unacceptable.
  • One proposal to avoid frequent cycling, such as when there is a slow leak in the water supply system, is to have two pre-set cut-in pressure thresholds, the higher one of which (say 80% of the pump's output pressure) is set when no leakage is detected, and the lower one of which (say 50% of the pump's output pressure) is set when leakage in the system is detected, that is when uniform pressure drops and repeat frequencies typical of slow leaks such as a dripping tap for example are detected.
  • the householder will again experience a significant variation in supply pressure until the higher cut-in threshold is re-set.
  • the leakage response may be unnecessarily triggered by equipment with a slow but constant demand for water, for example an evaporative cooler.
  • the invention seeks to provide a controller for the pump which alleviates the significant pressure variation problem yet still provides for effective detection of and response to leaks in the liquid supply system.
  • Another embodiment seeks to provide a controller having parts that are relatively easily assembleable and may therefore save manufacturing costs. Yet another embodiment seeks to provide a controller through which the liquid flow is directed to allow for improved flow characteristic measurements. A further embodiment seeks to provide a pressure unit which allows an observer (for example a user of a water supply system) to ascertain the status of the pressure within the unit.
  • the invention provides a controller for operating a pump associated with a liquid supply system, the controller including: a pressure unit including a housing having an inlet for connection to the liquid supply and an outlet for delivery of the liquid to a consumer, a control circuit mounted on the housing and including a sensor, wherein the pressure unit and the sensor are operatively associated such that the sensor generates signals related to pressures within the pressure unit, and wherein the control circuit is operative to determine from the signals generated by the sensor a rate of pressure change within the pressure unit to vary, in dependence upon the rate of pressure change, a threshold pressure value at which the control circuit is operative to switch on the pump to pressurise the liquid supply for delivery to the consumer.
  • the liquid supply system will have a closed head pressure, and preferably the variable threshold pressure at which the control circuit is operative to switch on the pump is a percentage of the closed head pressure (% cu t- ⁇ n), and wherein the rate of pressure change ⁇ and the % cut - ⁇ n are linearly, logarithmically or exponentially related.
  • the % cu t- ⁇ n and the ⁇ - are linearly related between a maximum % cu t- ⁇ n
  • % cu t- ⁇ n for example 30% of the closed head pressure
  • the invention provides a controller for operating a pump associated with a liquid supply system for the pump to pressurise the liquid supply, the liquid supply system having a closed head pressure
  • the controller including: a pressure unit including a housing having an inlet and an outlet, a diaphragm within the housing which is biased to act against the pressure of the liquid supply between the inlet and the outlet when a liquid supply is connected to the inlet, wherein the bias on the diaphragm is such that the diaphragm remains in substantially one position whilst the liquid supply pressure within the housing is at the closed head pressure, (wherein said one position depends upon the closed head pressure and may differ for the controller in different liquid supply systems), a circuit structure carrying a control circuit for operating the pump for supplying liquid to and through the housing, the control circuit including a sensor which is mounted on the circuit structure such that it is operatively associated with the diaphragm for sensing positions of the diaphragm as the diaphragm moves away from said one position in response to liquid
  • the inlet of the housing may include a valve for preventing reverse liquid flow into the inlet.
  • a valve may include a moveable closure member which contacts a valve seat when the valve is closed and the moveable closure member may be shaped such that a flow of liquid into the housing when the valve is open is directed towards the liquid flow sensor.
  • the design of the valve and its positioning within and size relative to the housing is such as to minimally affect pressure loss within the housing.
  • the aperture of the housing may be adjacent the valve, and thus adjacent the inlet, allowing any arrangement and number of outlets.
  • the inlet and the outlet of the pressure unit may be in-line and the aperture may be laterally located between the inlet and the outlet for the directed liquid flow to pass over the liquid flow sensor.
  • the circuit structure is preferably a printed circuit board on which the pressure sensor (for example a Hall effect device) and the flow sensor (for example a structure based on thermal techniques) are mounted.
  • a pressure unit for a liquid supply system for delivery of the liquid to a consumer having a closed head pressure
  • the pressure unit including: a housing having an inlet and an outlet, a diaphragm within the housing which is biased to act against the pressure of the liquid supply between the inlet and the outlet when a liquid supply is connected to the inlet, wherein the bias on the diaphragm is such that the diaphragm remains in substantially one position whilst the liquid supply pressure within the housing is at the closed head pressure (wherein said one position depends upon the closed head pressure and may differ for the controller in different liquid supply systems) and the diaphragm moves away from said one position when the liquid supply pressure within the housing decreases, wherein the diaphragm is associated, on its side that is not exposed to the liquid supply, with a moveable member having pressure indicia, wherein the housing includes a window and the window and moveable member are such that for the diaphragm in said one position
  • the indicia that are viewable through the window advantageously provide a relatively simple means for several pieces of information as to the liquid supply pressure condition within the pressure unit to be conveyed to a consumer without providing a quantitative pressure measurement.
  • the pressure will be zero and this could be indicated by red indicia being exposed in the window.
  • the exposed indicia could be green and if, for example, there is a leaking tap, and thereby reducing pressure within the pressure unit, the associated movement of the diaphragm may be indicated by green to red indicia being exposed.
  • Use of quantitative pressure measurements is deliberately avoided because there may be a range of "normal" operating pressures which may not be realised by consumers.
  • Figure 2 is an isometric view of a controller according to the preferred embodiment.
  • Figure 3 is an exploded view of the controller of figure 2 viewed from one direction.
  • Figures 7 and 8 are transverse cross-sectional views through a pressure chamber of the controller of figure 2, illustrating the inlet and outlet and a valve arrangement therewith, figure 7 illustrating the valve in a closed position and figure 8 illustrating the valve in an open position.
  • Figures 9 and 10 are isometric views of a portion of the controller of figure 2 illustrating the valve arrangement in two positions, similarly to figures 7 and 8.
  • Figure 1 1 is a block diagram illustrating functions of an electronic control circuit of the controller of figure 2.
  • Figures 13 and 14 are graphs illustrating operational regimes for a controller of figure 2.
  • a pump 24 for example a household rainwater tank, having a pump 24 driven by an electric motor 26 in an outlet for pumping the water to various consuming outlets 28, for example a tap, toilet, shower and/or laundry.
  • the electric motor 26 of the pump 24 is controlled via a controller 30 which controls the operation of the pump 24 based upon water pressure and water flow parameters that are determined via the controller 30.
  • the housing 34 contains a diaphragm 40 which is biased via the helical compression spring 42 to act against the pressure of the water within the pressure chamber 44 between the inlet 36 and the outlet 38 when a water supply is connected to the inlet 36.
  • the portion 34b of the housing 34 and the diaphragm 40 define the pressure chamber 44 with which the inlet 36 and the outlet 38 (which are formed in the intermediate portion 34b of housing 34) are in communication.
  • the end portion 34a of the housing 34 and the diaphragm 40 define another chamber 46 within which the spring 42 is located.
  • a still further chamber 48, which is adjacent to the pressure chamber 44 and opposite the diaphragm 40, is defined by the intermediate portion 34b and the cover portion 34c of the housing 34.
  • a circuit structure 50 carrying a control circuit 140 (to be described in detail below with reference to figures 1 1 and 12) is mounted within the chamber 48.
  • the end portion 34a of housing 34 includes an inwardly extending tubular part
  • the outside diameter of the cylindrical part 58 of the guide member 54 is sized such that it also is a sliding fit within an internal diameter defined by ribs 62 in the housing 34 end portion 34a that surround the inwardly extending tubular part 52.
  • the guide member 54 furthermore includes an outermost cylindrical skirt 59 which is shorter than the cylindrical part 58 and provides an end rim 61 which serves a purpose to be described below.
  • the end cap 60 of the guide member 54 provides a solid supporting seat for a raised central area 64 of the diaphragm 40.
  • the diaphragm 40 has an outwardly flared wall 66 (best seen in figure 5) which extends from the periphery of its central area 64 and which joins with a curved outer wall 68 having a circumferential flange 70.
  • the flange 70 formation seats within a complementary shaped recess 72 defined by the housing 34 end portion 34a and is clamped in position by a complementary shaped facing end 74 of a rib 76 on the housing 34 intermediate portion 34b when the housing 34 is assembled.
  • the contact regions between the flange 70 of the diaphragm 40 and the complementary recess 72 of the end portion 34a and the end 74 of rib 76 of the intermediate portion 34b are such that when the pressure chamber 44 contains water under pressure, the junctures are sealed to prevent the pressurised water from leaking into the spring chamber 46.
  • the diaphragm 40 also includes, protruding centrally from its central area 64, a blind cylindrical extension 78, within which fits the forward portion of the stem 56 of the guide member 54.
  • a permanent magnet 80 is mounted within the stem 56 at its forward end.
  • the closure member 84 includes a shaped end 88 (which is generally conical with a rounded apex - best seen in figure 8) which has a peripheral groove that retains an O ring 91.
  • the O ring 91 seals onto a valve seat 90 on the inlet 36.
  • a helical compression spring 92 surrounds the smaller diameter ring 87 of the tubular part 85 and acts between the ends of the legs 86 and a rear surface 89 of the shaped end 88 of the closure member 84 to bias the closure member 84 towards the inlet 36 into engagement with the valve seat 90.
  • the inlet 36 comprises a conduit 94 which extends into the pressure chamber 44 and is moulded as part of the intermediate portion 34b of the housing 34.
  • a connector fitting 96 (see figures 3 and 4), which includes at one end a screw thread 98 and a nut formation 100 and at the other end the valve seat 90 below which is a groove 102, is fitted through the conduit 94 and held captive therein by a circlip 104 which sits within the groove 102 and bears upon an end rim of the conduit 94 within the pressure chamber 44.
  • the connector fitting 96 is rotatable within the conduit 94 which allows ready attachment of piping from the pump 24 onto the threaded end 98.
  • valve arrangement 82 and more particularly the shaped end 88 of the closure member 84 within the pressure chamber 44 (which is relatively large compared to the valve arrangement 82) is such that there is minimal loss of head through the pressure chamber 44.
  • the wall 105 of the intermediate portion 34b of the housing 34 opposite to the diaphragm 40 includes an aperture 106 for a purpose to be described below.
  • the circuit structure 50 mounted within the chamber 48 is a printed circuit board 108 which includes a liquid flow sensor.
  • the flow sensor is of the type that operates based on thermal techniques and includes sources of heat such as resistive heater elements and temperature sensors, such as thermistors. Examples of such sensors are disclosed in International Publications WO 91/19170 (PCT/AU91 /00239) and WO 03/029656 (PCT/AU02/01334).
  • the electronic circuitry of the flow sensor of the present embodiment is described in detail below with reference to figures 1 1 and 12.
  • the flow sensor comprises a metal plate 1 10 (see figures 3 and 4) onto an insulating layer on a rear surface of which the heater elements and thermistors are mounted.
  • the purpose of the shaped end 88 of the closure member 84 of the valve arrangement 82 is to direct water flow entering the pressure chamber 44 from the inlet 36 towards the flow sensor, that is towards and over the surface of the metal plate 1 10 which is exposed through the aperture 106.
  • the flow sensor provides a flow signal to the control circuit 140 (to be described below with reference to figures 1 1 and 12) to recognise there is a water flow through the pressure chamber 44 of the housing 34 for the control circuit 140 to continue to operate the electric motor 26 of the pump 24.
  • Two limits are defined for the movement of the diaphragm 40/guide member 54 arrangement.
  • One limit, for high pressure within the pressure chamber 44, is set by the end rim 61 of the outer most cylindrical skirt 59 of the guide member 54 bearing upon a step 1 18 inside the end portion 34a of the housing 34 (see figure 6).
  • the other limit, for low pressure within the pressure chamber 44, is set by a laterally extending head 122 of a screw 120 in the rearward end of the stem 56 of the guide member 54 bearing against a shoulder 124 formed within the bore of the inwardly extending tubular part 52 of the end portion 34a of the housing 34 (see figure 5).
  • a protective cap 126 is fitted to the end portion 34a to close the bore of the tubular part 52.
  • a sealing ring 132 is interposed between the intermediate portion 34b and the cover portion 34c of the housing 34 to ensure that the circuit structure 50 is sealed within the chamber 48.
  • the control circuit 140 comprises several sections that serve different functions, as shown by the functional blocks in figure 1 1. Thus there is a microcontroller and its support circuitry 142, and power supply circuitry 144 for operating the various functions via the microcontroller. There is water pressure detector circuitry 146, of which the Hall effect device 1 16 is a component, and water flow detector circuitry 148 of which the metal plate 1 10 is a part. The microcontroller and support circuitry 142 determines the operation of pump driver circuitry 152 for operating the pump 24 via its electric motor 26. Additionally there is LED and LED driver circuitry 154 for indicating various control conditions.
  • the resistors H1 , H2 and H3 are mounted on the rear surface of the metal plate 1 10 over an insulating layer and are connected in series and form the basis of the primary heat source.
  • the power dissipated by these three resistors is regulated by the microcontroller IC1 , through pulse width modulation on the switching of the transistor Q3.
  • the three thermistors, TH1 , TH2 and TH3, are strategically located on the metal plate 1 10 of the printed circuit board 108, also over the insulating layer, and are designed to measure the temperature at the surface on which they are mounted.
  • the power dissipated by the resistors, H1 , H2 and H3, will be distributed unevenly along the surface of the metal plate 1 10, hence the three thermistors, TH1 , TH2 and TH3 will register slightly different temperature measurements.
  • the microcontroller IC1 continuously monitors the temperature differential between the thermistors TH1 and TH2.
  • the metal plate 1 10 of the printed circuit board 108 is in constant contact with water, hence water flow will improve the thermal conduction along the surface of the metal plate 1 10 and a reduction in the temperature differential between TH1 and TH2.
  • the microcontroller IC1 will use this information in an algorithm to determine whether water is flowing or not.
  • the thermistor TH3 is used to compensate for an additional temperature effect due to the Triac Q1 while the pump is in operation.
  • the water pressure detector circuitry 146 comprises the integrated circuit IC2 and capacitor C13.
  • the integrated circuit IC2 is a Hall effect device that translates the magnetic field it senses from the permanent magnet 80 into an analogue voltage that is presented to pin 2 of the microcontroller IC1.
  • the power supply circuitry 144 comprises the Varistor (VDR1 ), capacitors (C2, C3, C4, C5, C6, C7, C8, C14, C15, C17 and C18), resistors (R1 , R16, R25, R26, R27, R28, R29 and R30), diodes (D1 , D2, D3, D4, D5, D6, D7, D8, D9 and D10), inductors (L1 and L2), transformer (T1 ) and integrated circuits (IC3, IC4 and IC5). VDR1 and C1 provide protection against electrical noise spikes at the mains supply input.
  • VDR1 and C1 provide protection against electrical noise spikes at the mains supply input.
  • Diodes D1 , D2, D3 and D4 form a full bridge rectifier which rectifies the input mains supply voltage to a full-wave rectified DC voltage.
  • Components C2, L1 and C3 form a pi-filter network that provides filtering to the rectified DC voltage from the bridge rectifier a well as differential mode EMI filtering.
  • a flyback power supply is formed by the integrated circuit (IC3), resistors R16,
  • the AC voltage at the secondary winding of the transformer T1 is half-wave rectified by the diode D9 and converted into a filtered DC voltage by a pi-filter comprised of L2, C15 and C14.
  • the filtered DC voltage is regulated by the zener diode D7.
  • the filtered DC voltage exceeds the sum of the zener diode's voltage and optocoupler LED forward voltage, current will flow in the coupler LED and will cause the transistor of the optocoupler to sink current.
  • this current exceeds the threshold level at pin 1 of IC3, IC3 will inhibit the next switching cycle.
  • IC3 will initiate a conduction cycle and by adjusting the number of enabled cycles, output regulation is maintained.
  • Components D6, R28, R16, C4, D10 and C18 provide over-voltage protection to the power supply.
  • the bias voltage exceeds the sum of the zener diode's voltage, D10, and the threshold voltage level at pin 2 of IC3
  • current begins to flow into pin 2 of IC3.
  • IC3 will shut down until the voltage level at pin 2 of IC3 drops below a pre-determined level.
  • the resistors (R13, R14 and R17) and LEDs (LD1 , LD2 and LD3) form the LED and LED driver circuitry 154.
  • a high logic level at pin 3 pin 9 and pin 15 of IC1 will turn on the LED LD1 , LD2 and LD3 respectively.
  • Resistor R24 and push button S1 form the user input circuit. Pressing S1 will present a logic level low signal at pin 1 1 of lCL
  • the pump 24 Upon installation of a controller 30 in a water supply system 20, the pump 24 is operated to establish a closed head pressure for the system, that is the maximum water pressure within the pressure unit 32 that is established with all of the consuming outlets 28 closed. The pump 24 is then turned off and the pressure unit reverts to a normal standby condition wherein, as illustrated by figure 6, the diaphragm maintains a first position against the bias of the spring 42 whereat the magnet 80 is maximally spaced from the Hall effect device 1 16 and, as illustrated by figure 7, the valve arrangement 82 is closed.
  • the pump driver circuitry 152 of the control circuit 140 When the pressure within the pressure chamber 44 reduces to some predetermined level of pressure below the closed head (called the cut-in pressure) the pump driver circuitry 152 of the control circuit 140 will switch on, via the Triac Q1 , the electric motor 26 and thus the pump 24, provided the water flow detector circuitry 148 detects water flow over the metal plate 110 and the water level detector circuitry 150 detects that there is a supply of the water. The switching on of the pump 24 ensures that the water supply pressure in the water supply system 20 is maintained within a predetermined range from the closed head pressure. When the consuming outlet or outlets 28 is/are closed, the flow signal ceases and the controller 30 reverts to the normal standby condition.
  • the circuitry 146 In another fault situation of a leak in the water supply system 20, for example a dripping tap 28, then from the standby condition of the controller 30, there will occur a slow loss of pressure within the pressure chamber 44 which will result in movement of the diaphragm 40 (and thus its associated magnet 80) towards the Hall effect device 1 16 and thus detection of the reducing pressure via the circuitry 146.
  • detection of the reducing pressure is operative to vary the cut-in pressure, that is, generally to reduce it to avoid frequent switching on and off of the pump 26.
  • the LED and LED driver circuitry 154 is operative for the LEDs to indicate different conditions, for example green for "on”, red for "standby” and yellow for "fault".
  • the push button S1 is a manual start button for priming the pump.
  • a cut-in pressure can be determined as a percentage of the closed head pressure (% cu t-m) dependent upon a rate of change of pressure ( ⁇ , where P is pressure and t is time).
  • the relationship between the % cut . ⁇ n and the ⁇ can be linear, for example as shown by line 160 of the graph of figure 12. Alternatively it may for example be logarithmic (see curve 162 of figure 12) or exponential (see curve 164 of figure 12).
  • the relationship need not be a continuous function, for example a maximum and/or a minimum % cut - ⁇ n (for example 90% and 30% respectively as illustrated by the graph of figure 13) may be provided where values respectively above and below these %cut-ms are set to a constant value.
  • the relationship 1 16 illustrated by figure 13 is linear between the maximum and minimum % cut . ⁇ n values.
  • a water supply system 20 may include a relatively large external accumulator tank (not shown). If such an accumulator tank is present in the system 20, the rate of pressure change will be slower for any given flow rate than in a system without such a tank.
  • the controller 30 may be adapted for such a system by making the % cu t- ⁇ n a function of not only the rate of change of pressure but also the water flow rate, for example:
  • %cut- ⁇ n f (IT . Q) where Q is the volumetric flow or
  • the controller 30 may include indicia viewable by a consumer to give an indication as to the water supply pressure condition within the pressure chamber 44.
  • the housing portion 34a may include a window 170 and the guide member 54 may include, on its outermost cylindrical skirt 59, indicia 172 that are viewable through the window 170.
  • the visible indicia may be green for the diaphragm 40/drive member 54 arrangement positioned as illustrated in figure 6 (that is for normal pressure within the pressure chamber 44) and may show red for pressures that are reduced, for example for the diaphragm 40/guide member 54 arrangement positioned as illustrated in figure 5.
  • a controller 30 may be used for "mains boosting", that is, for example with a mains supply system to a household where the mains pressure is low or unacceptably variable. Using the control regime described above and with the mains pressure applied to the pressure chamber 44, so long as the mains pressure is above a threshold cut-in value, the pump will not start. However should the pressure fall below the cut-in pressure, then according to the rate of pressure change, the pump will be started at some lower threshold ready to boost the supply pressure.

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

Abstract

L'invention porte sur un dispositif de commande (30) destiné à actionner une pompe associée à un système d'alimentation en liquide. Le dispositif de commande inclut une unité de pression comprenant un boîtier (34a, 34b, 34c) comportant une entrée de liquide (98) et une sortie de liquide (39, 130). Une membrane (40) sollicitée (42) à l'intérieur du boîtier agit contre la pression de liquide à l'intérieur du boîtier entre l'entrée et la sortie. Un circuit de commande (50) comprenant un capteur à effet Hall est monté sur le boîtier et est sensible au déplacement de la membrane (40) par l'intermédiaire d'un aimant (80) associé à celle-ci. Ainsi, le capteur à effet Hall génère des signaux relatifs aux pressions à l'intérieur du boîtier, à partir desquels on détermine un taux de modification de pression. Une valeur de pression de seuil à laquelle le circuit de commande (50) fonctionne pour démarrer la pompe est modifiée en fonction du taux de modification de pression.
EP10740829.6A 2009-02-13 2010-02-09 Dispositif de commande pour une pompe d'alimentation en liquide Withdrawn EP2396554A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2009900606A AU2009900606A0 (en) 2009-02-13 Controller for a liquid supply pump
PCT/AU2010/000127 WO2010091454A1 (fr) 2009-02-13 2010-02-09 Dispositif de commande pour une pompe d'alimentation en liquide

Publications (2)

Publication Number Publication Date
EP2396554A1 true EP2396554A1 (fr) 2011-12-21
EP2396554A4 EP2396554A4 (fr) 2017-05-24

Family

ID=42561312

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10740829.6A Withdrawn EP2396554A4 (fr) 2009-02-13 2010-02-09 Dispositif de commande pour une pompe d'alimentation en liquide

Country Status (5)

Country Link
US (1) US20120039723A1 (fr)
EP (1) EP2396554A4 (fr)
CN (1) CN102395794B (fr)
AU (1) AU2010213344B2 (fr)
WO (1) WO2010091454A1 (fr)

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US20170122304A1 (en) * 2014-06-20 2017-05-04 Hitachi Koki Co., Ltd. Liquid discharge apparatus
US20170089331A1 (en) * 2015-01-30 2017-03-30 H2O Gone, Llc Fluid removal from a sump with electronic control and fluid type separation
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JP7113486B2 (ja) * 2017-02-08 2022-08-05 アヴラン インダストリアル，インコーポレーテッド 動物用噴霧装置および方法
BR112019019726A2 (pt) * 2017-03-22 2020-11-17 Jonathan Ballesteros aparelho, sistema e dispositivo de baixo fluxo
CA3006944C (fr) * 2017-06-01 2020-10-27 Edward W. Jackson Module de service servant a depanner un module de pompage
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US20120039723A1 (en) 2012-02-16
WO2010091454A1 (fr) 2010-08-19
EP2396554A4 (fr) 2017-05-24
AU2010213344B2 (en) 2014-07-24
CN102395794A (zh) 2012-03-28
CN102395794B (zh) 2015-05-06
AU2010213344A1 (en) 2011-08-18

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