A method and apparatus for measuring a resultant flow delivered by a pump coupled to an over pressure valve, the method comprising the steps of: measuring, using a first flow meter, feed flow to the pump; measuring, using a second flow meter, return flow from the over pressure valve; and calculating
A method and apparatus for measuring a resultant flow delivered by a pump coupled to an over pressure valve, the method comprising the steps of: measuring, using a first flow meter, feed flow to the pump; measuring, using a second flow meter, return flow from the over pressure valve; and calculating resultant flow, at least in part, by subtracting measured return flow from measured feed flow. A pump power modification module can further modifying the pump output pressure to enable pressure profiling.
대표청구항▼
1. A coffee making apparatus including: a vibration or displacement pump for delivering fluid flow;a power modification module controlling the electrical power applied to the pump for modifying output pressure of the pump output, the power modification module modifies alternating current power suppl
1. A coffee making apparatus including: a vibration or displacement pump for delivering fluid flow;a power modification module controlling the electrical power applied to the pump for modifying output pressure of the pump output, the power modification module modifies alternating current power supplied to the pump during a phase of an alternating current power cycle; wherein phase control enables only portions of the alternating current cycle to be supplied to the pump for modifying output pressure of the pump output;a user interface coupled to the power modification module for user configuration of a power profile of a dose production cycle, the power profile being indicative of electrical power delivered to the pump over a dose production cycle;wherein the power modification module controls the pump output according to the user configured power profile. 2. An apparatus according to claim 1, wherein the power modification module uses phase control of an alternating current power supply to enables only portions of the alternating current cycle to be coupled to the pump, thereby to control output pressure of the pump output. 3. An apparatus according to claim 2, wherein controlling the pump output pressure further enables pressure profiling during a dose production cycle. 4. An apparatus according to claim 3, wherein the pressure profiling is in the form of a power to time profile indicative of electrical power delivered to a respective pump. 5. An apparatus according to claim 3, wherein the pressure profiling is in the form of a power to dose flow profile indicative of electrical power delivered to a respective pump. 6. An apparatus according to claim 1, wherein the power modification module controls the pump output to provides a pre-infusion fluid dose at a predetermined pre-infusion pressure; the pre-infusion pressure being less than the normal output pressure of the pump output. 7. An apparatus according to claim 1, wherein the a user interface receives user input power profile that is indicative of pump output pressure as a function of time for the dose production cycle; the wherein the power modification module controls the pump output to according to the user configured power profile. 8. An apparatus according to claim 1, wherein the a user interface receives user input power profile that is indicative of pump output pressure as a function of dose delivered for the dose production cycle; the wherein the power modification module controls the pump output to according to the user configured power profile. 9. A coffee making apparatus, the apparatus providing pre-infusion, the apparatus comprising: a vibration pump for delivering fluid flow from a fluid source;a power modification module that modifies alternating current power supplied to the pump during phase of an alternating current power cycle; wherein phase control of enables only portions of the alternating current cycle to be supplied to the pump for modifying output pressure of the pump output;a user interface coupled to the power modification module for configuring a dose production cycle comprising a pre-infusion stage and an extraction stage;wherein the power modification module provides, using the pump output, a pre-infusion fluid dose at a predetermined pre-infusion pressure; wherein the pre-infusion pressure is less than the maximum pressure produced by the pump;wherein the power modification module provides, using the pump output, an extraction fluid dose after the pre-infusion fluid dose; the extraction fluid dose being provided at a predetermined pressure greater than the predetermined pre-infusion pressure. 10. The apparatus according to claim 9, wherein pre-infusion pressure is less than the normal output pressure of the pump output. 11. The apparatus according to claim 9, wherein pre-infusion pressure is in the range from 1 to 5 bar. 12. The apparatus according to claim 9, wherein the-pre infusion pump output pressure is user defined through the user interface. 13. The apparatus according to clam 9, wherein modifying the pump output pressure further enables pressure profiling during the dose production cycle. 14. The apparatus according to claim 12, wherein the pump output pressure profile comprises a plurality of pressure levels, each pressure levels being for a respective duration based on time. 15. The apparatus according to claim 12, wherein the pump output pressure profile comprises a plurality of pressure levels, each pressure levels being for a respective duration based on a measured dose flow volume. 16. The apparatus according to claim 12, wherein the pump output pressure profile is user defined through the user interface. 17. The apparatus according to claim 12, wherein the coffee making apparatus provides a dose flow having regulated pressure and volume.
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이 특허에 인용된 특허 (7)
Gill David C. (Keynsham GBX), Apparatus for delivering a liquid.
Massimo Sanna (Agrate Brianza ITX), System and device for supplying desired liquid volumes by means of a metering pump in variable flow rate condition.
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