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An ultrasonic pump having a first housing connected to a second housing to create a cavity therebetween. The first housing has a central stem that extends into the cavity with a passage for connecting the cavity with an outlet port. The second housing has an inlet port for communicating hydraulic fl

An ultrasonic pump having a first housing connected to a second housing to create a cavity therebetween. The first housing has a central stem that extends into the cavity with a passage for connecting the cavity with an outlet port. The second housing has an inlet port for communicating hydraulic fluid to the cavity. A plurality of piezoelectric disc are located on the stem by a first diaphragm to defined a actuation chamber within the cavity. The first diaphragm engages the first housing and stem to isolate the piezoelectric disc from hydraulic fluid supplied to the cavity and place a predetermined axial force on the piezoelectric disc. A second diaphragm located in the first and second housing has first and second surfaces which are substantially equal distances from the passage and the inlet port. Thereafter, air is bleed from the cavity to assure that only hydraulic fluid is present in the cavity. The piezoelectric disc are connected to a source of electrical energy and in response to an excitation signal develop a fluctuating force. The fluctuating force has an axial component and a radial component and the axial component alone is communicated to the first diaphragm. After the axial component of the fluctuating force overcomes the predetermined axial force, the fluid pressure of the hydraulic fluid in the cavity changes as a function of the axial component force. This change in fluid pressure causes sequential movement of first and second surfaces of the second diaphragm toward the inlet port and passage and as a result hydraulic fluid is transmitted from the cavity through the passage to the outlet port.

대표청구항 ▼

An ultrasonic pump, comprising a first housing connected to a second housing with a cavity formed therebetween, said first housing having a central stem that extends into said cavity with a passage for connecting said cavity with an outlet port, said second housing having an inlet port for communica

An ultrasonic pump, comprising a first housing connected to a second housing with a cavity formed therebetween, said first housing having a central stem that extends into said cavity with a passage for connecting said cavity with an outlet port, said second housing having an inlet port for communicating hydraulic fluid to said cavity, a plurality of piezoelectric disc surrounding said stem, a first diaphragm secured to said stem for isolating said piezoelectric disc from hydraulic fluid supplied to said cavity and for placing a predetermined axial force on said piezoelectric disc, a second diaphragm located in said cavity between said passage and said inlet port, and means to excite said piezoelectric discs to develop a fluctuating force having an axial component and a radial component, said axial component of said fluctuating force after overcoming said predetermined axial force changing the fluid pressure of the hydraulic fluid in said cavity as a function of said axial component force, said change in fluid pressure causing sequential movement of said second diaphragm toward said inlet port and said passage to transmit hydraulic fluid from said cavity through the passage to said outlet port.