Pump

A technology of pump cavity and outlet flow channel, applied in the direction of pump, pump control, pump components, etc., can solve the problems of pressure drop, operation failure, inability to achieve miniaturization, high efficiency, etc.
CN1469046AInactive Publication Date: 2004-01-21SEIKO EPSON CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SEIKO EPSON CORP
Publication Date
2004-01-21
Estimated Expiration
Not applicable · inactive patent

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Abstract

A pump according to the present invention has a circular diaphragm 4 placed at the bottom of a casing 2. At the bottom of the diaphragm 4, a piezoelectric element 6 is installed in contact with the diaphragm 4. A narrow space between the diaphragm 4 and the top wall of the casing 2 constitutes a pumping chamber 8. An inlet flow path 12 and an outlet flow path 14 are open to the pumping chamber 8, wherein a check valve 10 is installed in the inlet flow path 12. Immediately downstream of the pumping chamber, the outlet flow path 14 has a narrow segment 16. The narrow segment 16 of the outlet flow path has 1 / 2 the diameter and 1 / 4 the cross sectional area of the outlet flow path 14. The outlet flow path 14 has a return inlet 22, which is connected to a return outlet 23 in the inlet flow path via an active valve 24. The active valve 24 is opened and closed freely by an actuator 26 made of shape-memory alloy.
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Description

technical field

[0001] This invention relates to a positive displacement pump which moves fluid by changing the volume of its pump chamber with a piston or diaphragm, and more particularly to a pump with high flow rate and high reliability. Background technique

[0002] Conventionally, such a typical pump has check valves installed between the inlet flow path and the variable-volume pump chamber, and between the outlet flow path and the pump chamber, for example in Japanese Patent Laid-Open No. 10-220357 described in .

[0003] Meanwhile, as described in Japanese Patent Laid-Open No. 08-312537, for example, a pump that generates unidirectional flow by utilizing viscous resistance is constructed so that when a valve installed in the outlet flow path is opened, the fluid resistance in the inlet flow path greater than the fluid resistance in the outlet channel.

[0004] Furthermore, for example, as described in the National Publication of International Patent Application No. ...

Claims

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