US 12,486,838 B2
Pump control device and pump control system
Takahiko Irie, Tokyo (JP); Shigenori Inamoto, Tokyo (JP); Yuki Takahashi, Tokyo (JP); Chikara Sekiguchi, Tokyo (JP); and Yuta Yoshii, Tokyo (JP)
Assigned to MINEBEA MITSUMI INC., Nagano (JP)
Appl. No. 17/907,528
Filed by MINEBEA MITSUMI INC., Nagano (JP)
PCT Filed Mar. 24, 2021, PCT No. PCT/JP2021/012111
§ 371(c)(1), (2) Date Sep. 27, 2022,
PCT Pub. No. WO2021/200423, PCT Pub. Date Oct. 7, 2021.
Claims priority of application No. 2020-064576 (JP), filed on Mar. 31, 2020.
Prior Publication US 2023/0147348 A1, May 11, 2023
Int. Cl. F04B 45/047 (2006.01)
CPC F04B 45/047 (2013.01) 6 Claims
OG exemplary drawing
 
1. A pump control system, comprising:
a pump; and
a pump control device for controlling the pump,
wherein the pump includes:
a vibration actuator having a fixed body, a shaft portion provided on the fixed body, a vibrating body provided so that the vibrating body can freely perform reciprocating rotation with respect to the fixed body around the shaft portion, a pressing portion provided on the vibrating body so as to protrude in a direction of the reciprocating rotation of the vibrating body, a magnet provided on one of the fixed body and the vibrating body, a coil core portion provided on another one of the fixed body and the vibrating body, and a coil provided on the coil core portion, wherein the vibrating body can perform the reciprocating rotation due to electromagnetic drive caused by electrical current supply to the coil,
a sealed chamber which includes a movable wall which can be displaced by the pressing portion when the vibrating body performs the reciprocating rotation so that a volume in the sealed chamber can be changed by displacement of the movable wall and fluid can be suctioned into an inside of the sealed chamber or discharged from the inside of the sealed chamber when the volume in the sealed chamber is changed, and
a discharge portion for communicating the fluid between the sealed chamber and a tank for storing the fluid discharged from the sealed chamber therein to increase pressure of the fluid, and
wherein the pump control device comprises:
an obtaining part for obtaining pressure value information indicating a value of the pressure of the fluid in the tank, and
a control unit for controlling a drive frequency of an electrical current to be supplied to the coil based on the obtained pressure value information,
wherein the control unit switches the drive frequency from a first drive frequency for maximizing a flow rate of the fluid from the pump into the tank to a second drive frequency for maximizing the pressure of the fluid in the tank when the value of the pressure of the fluid in the tank reaches a switching pressure value,
wherein the second drive frequency is higher than the first drive frequency, and
wherein the vibrating body of the vibration actuator is supported by a spring mass structure constituted of a magnetic spring provided by the magnet and the coil core portion so that the vibrating body can freely perform the reciprocating rotation.