Pneumatic piston pump metering and dispense control
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F04B-043/06
F04B-043/073
F04B-009/125
F04B-009/105
F04B-009/107
F04B-049/06
출원번호
US-0148986
(2014-01-07)
등록번호
US-9605664
(2017-03-28)
발명자
/ 주소
Seith, Warren A.
출원인 / 주소
Ingersoll-Rand Company
대리인 / 주소
Barnes & Thornburg LLP
인용정보
피인용 횟수 :
1인용 특허 :
17
초록▼
Illustrative embodiments of pump systems and methods are disclosed. In at least one embodiment, an apparatus comprises a piston pump including a motor and a plunger, where the motor is configured to drive linear reciprocating motion of the plunger in response to being supplied with a flow of compres
Illustrative embodiments of pump systems and methods are disclosed. In at least one embodiment, an apparatus comprises a piston pump including a motor and a plunger, where the motor is configured to drive linear reciprocating motion of the plunger in response to being supplied with a flow of compressed fluid, a metering valve fluidly coupled to the motor, the metering valve being configured to control the flow of compressed fluid to the motor, a purge valve fluidly coupled between the metering valve and the motor, a linear encoder coupled to the piston pump, the linear encoder configured to generate sensor data indicative of a position of the plunger, and an electronic controller operatively coupled to the metering valve, the purge valve, and the linear encoder, where the electronic controller is configured to receive sensor data from the linear encoder and to control the metering valve and the purge valve.
대표청구항▼
1. Apparatus comprising: a piston pump including a motor and a plunger, wherein the motor is configured to drive linear reciprocating motion of the plunger in response to being supplied with a flow of compressed fluid;a metering valve fluidly coupled to the motor, the metering valve being configured
1. Apparatus comprising: a piston pump including a motor and a plunger, wherein the motor is configured to drive linear reciprocating motion of the plunger in response to being supplied with a flow of compressed fluid;a metering valve fluidly coupled to the motor, the metering valve being configured to control the flow of compressed fluid to the motor;a purge valve fluidly coupled between the metering valve and the motor;a linear encoder coupled to the piston pump, the linear encoder configured to generate sensor data indicative of a position of the plunger;an electronic controller operatively coupled to the metering valve, the purge valve, and the linear encoder, wherein the electronic controller is configured to receive sensor data from the linear encoder and to control the metering valve and the purge valve; anda pressure sensor fluidly coupled to an outlet of the piston pump and operatively coupled to the electronic controller, the pressure sensor configured to generate pressure data indicative of a pressure of the fluid media pumped by the piston pump, wherein the electronic controller is configured to determine that the linear reciprocating motion of the plunger has stopped when the pressure data indicates that the pressure of the fluid media has reached a threshold value. 2. The apparatus of claim 1, wherein the electronic controller is configured to: transmit a first control signal to cause the metering valve to permit the flow of compressed fluid to the motor;determine a dispensed volume of a fluid media pumped by the piston pump as a function of the sensor data and a volume-distance calibration factor;modify the first control signal, in response to determining that the dispensed volume is equal to or greater than a target volume, to cause the metering valve to block the flow of compressed fluid to the motor; andtransmit a second control signal, in response to determining that the dispensed volume is equal to or greater than a target volume, to cause the purge valve to vent compressed fluid from the motor. 3. The apparatus of claim 2, wherein the electronic controller is further configured to modify the second control signal, in response to determining that the linear reciprocating motion of the plunger has stopped, to cause the purge valve to cease venting compressed fluid from the motor. 4. The apparatus of claim 2, wherein the electronic controller is configured to determine the dispensed volume, in part, by disregarding a distance moved by the plunger between its end-of-stroke position and its pump-start position. 5. The apparatus of claim 1, wherein the electronic controller is further configured to: transmit a control signal to cause the metering valve to permit the flow of compressed fluid to the motor;determine a volumetric flow rate of a fluid media pumped by the piston pump as a function of the sensor data and a volume-distance calibration factor; andmodify the control signal as a function of the determined volumetric flow rate and a target volumetric flow rate. 6. The apparatus of claim 5, wherein the electronic controller is configured to determine the volumetric flow rate, in part, by disregarding a distance moved by the plunger between its end-of-stroke position and its pump-start position. 7. The apparatus of claim 1, wherein the electronic controller is configured to: transmit a first control signal to cause the metering valve to permit the flow of compressed fluid to the motor;determine the pressure of the fluid media pumped by the piston pump using the pressure data received from the pressure sensor; andmodify the first control signal as a function of the determined pressure and a target pressure. 8. The apparatus of claim 7, wherein the electronic controller is further configured to: modify the first control signal, in response to the determined pressure being equal to or greater than the target pressure, to cause the metering valve to block the flow of compressed fluid to the motor; andtransmit a second control signal, in response to the determined pressure being equal to or greater than the target pressure, to cause the purge valve to vent compressed fluid from the motor. 9. The apparatus of claim 8, wherein the electronic controller is further configured to modify the second control signal, in response to determining that the linear reciprocating motion of the plunger has stopped, to cause the purge valve to cease venting compressed fluid from the motor. 10. The apparatus of claim 1, wherein: the metering valve comprises a plurality of solenoid valves fluidly coupled in a parallel network; andthe electronic controller is configured to transmit one or more control signals that selectively open or close each of the plurality of solenoid valves to control the flow of compressed fluid to the motor. 11. A method comprising: transmitting a first control signal to a metering valve to cause the metering valve to supply compressed fluid to a motor of a piston pump such that the motor drives linear reciprocating motion of a plunger of the piston pump;receiving sensor data from a linear encoder coupled to the piston pump, the sensor data being indicative of a position of the plunger of the piston pump;determining a dispensed volume of a fluid media pumped by the piston pump as a function of the sensor data and a volume-distance calibration factor;modifying the first control signal, in response to determining that the dispensed volume is equal to or greater than a target volume, to cause the metering valve to cease supplying compressed fluid to the motor;transmitting a second control signal, in response to determining that the dispensed volume is equal to or greater than a target volume, to a purge valve fluidly coupled between the metering valve and the motor to cause the purge valve to vent compressed fluid from the motor; andwherein determining the dispensed volume comprises:receiving pressure data from a pressure sensor coupled to an outlet of the piston pump, the pressure data being indicative of a pressure of the fluid media pumped by the piston pump; anddisregarding a distance moved by the plunger until the pressure data indicates that the pressure of the fluid media has reached a threshold value. 12. The method of claim 11, further comprising modifying the second control signal, in response to determining that the linear reciprocating motion of the plunger has stopped, to cause the purge valve to cease venting compressed fluid from the motor. 13. The method of claim 11, wherein determining the dispensed volume comprises: detecting the plunger reaching its end-of-stroke position using the sensor data;detecting the plunger reaching its pump-start position using the sensor data; anddisregarding a distance moved by the plunger between the end-of-stroke position and the pump-start position. 14. The method of claim 11, further comprising transmitting a second control signal that causes a second piston pump to pump a volume of fluid media that is proportional to the dispensed volume. 15. A method comprising: transmitting a control signal to a metering valve to cause the metering valve to supply compressed fluid to a motor of a piston pump such that the motor drives linear reciprocating motion of a plunger of the piston pump;receiving sensor data from a linear encoder coupled to the piston pump, the sensor data being indicative of a position of the plunger of the piston pump;determining a volumetric flow rate of a fluid media pumped by the piston pump as a function of the sensor data and a volume-distance calibration factor;modifying the control signal as a function of the determined volumetric flow rate and a target volumetric flow rate;wherein determining the volumetric flow rate comprises:receiving pressure data from a pressure sensor coupled to an outlet of the piston pump, the pressure data being indicative of a pressure of the fluid media pumped by the piston pump; anddisregarding a distance moved by the plunger until the pressure data indicates that the pressure of the fluid media has reached a threshold value. 16. The method of claim 15, wherein determining the volumetric flow rate comprises: detecting the plunger reaching its end-of-stroke position using the sensor data;detecting the plunger reaching its pump-start position using the sensor data; anddisregarding a distance moved by the plunger between the end-of-stroke position and the pump-start position. 17. The method of claim 15, further comprising transmitting a second control signal that causes a second piston pump to pump fluid media at a volumetric flow rate proportional to the determined volumetric flow rate.
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