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Fluid transportation system

Inactive Publication Date: 2007-03-01
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0020] when R represents a flow path resistance value of the filtering section and C represents an acoustic capacitance value of the pressure absorbing section, a value obtained by multiplication between R and C is not smaller than a driving cycle period value of the micropump.

Problems solved by technology

However, this type of micropump has a problem that a pressure vibration wave, which is generated in the chamber due to driving of a piezoelectric element, is transferred to the upstream side and downstream side through the inlet and outlet.
However, such a pressure-absorbing section is not always complete, leaving a problem that vibration that leaks from the pressure-absorbing section affects sections where the vibration is applied in a case where an active component such as a pump or movable valve is not provided at the upstream side or downstream side of the pressure-absorbing section.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

first embodiment

(Schematic structure in a first embodiment, referring to FIGS. 1A and 1B)

[0053] A fluid transportation system 10A in accordance with a first embodiment includes, as shown in FIG. 1B, a joint of a glass substrate 11 and thin plate 20. The glass substrate 11 is formed with an inlet 12 and outlet 13. Further, the thin plate 20 is made of a SI-based substrate that is formed by etching with a chamber 21, throttle flow paths 22 and 23, fluid reservoir 24, filtering section 25, flow path 26, pressure absorbing section 27, and narrow section 28, these communicating with each other. Further, a piezoelectric element 30 as an actuator is stuck on the outer surface of the chamber 21, and the membrane portion of the chamber 21 functions as a diaphragm.

[0054] Taking an example of concrete dimensions, the thin plate 20 is 200 μm thick; the membrane diaphragm or the like of the chamber 21 is 30 μm thick; and the throttle flow paths 22 and 23 are 25 μm deep.

[0055] The fluid reservoir 24 is formed ...

second embodiment

(Schematic Structure in a Second Embodiment, Refer to FIG. 4)

[0065] A fluid transportation system 10B in a second embodiment is constructed basically, as show in FIG. 4, by connecting, in parallel, two fluid transportation systems each including a micropump 31, described in the first embodiment, and merges transported fluids at a merging section 29a which joints flow paths 29, 29 provided on the downstream side of narrow sections 28, 28.

[0066] When plural micropumps fluid-communicate with each other through a flow path, a vibration generated by one micropump affects the operation of another micropump and tends to cause characteristic variation. However, as in the present second embodiment, when micropumps 31, 31 are connected in parallel, micropumps 31, 31 do not affect each other.

third embodiment

(Schematic Structure in a Third Embodiment, Refer to FIG. 5)

[0067] A fluid transportation system 10C in a third embodiment is constructed, as shown in FIG. 5, basically by connecting, in parallel, two fluid transportation systems each including a micropump 31, similarly to the second embodiment, and merges transported fluids at a merging section 29a which joints flow paths 29, 29 communicating with the downstream side of pressure absorbing sections 27. In the present third embodiment, instead of the narrow section 28 described in the first and second embodiment, filtering sections 25 (each including a first filtering section 25a and second filtering section 25b) are provided. Herein, the downstream side of the fluid reservoirs 24 and the upstream side of the pressure absorbing sections 27 have a circular shape in a top view.

[0068] The effects of the present third embodiment are the same as those in the first embodiment, and the effects by the parallel connection of the two micropum...

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Abstract

A fluid transportation system includes: a micropump provided with a chamber and a diaphragm driven by an actuator; fluid communication sections communicating with both ends of the chamber of the micropump; a pressure absorbing section that is provided at least one of the fluid communication sections so as to absorb or reduce a fluid vibration pressure; and a narrow section that is provided at a position further than the pressure absorbing section from the chamber so as to narrow a flow path cross-section, wherein, when R represents a flow path resistance value of the narrow section and C represents an acoustic capacitance value of the pressure absorbing section, a value obtained by multiplication between R and C is not smaller than a driving cycle period value of the micropump.

Description

[0001] This application is based on Japanese Patent Applications No. 2005-253219 filed on Sep. 1, 2005 and No. 2006-157492 filed on Jun. 6, 2006 in Japan Patent Office, the entire content of which is hereby incorporated by reference. FIELD OF THE INVENTION [0002] The present invention relates to a fluid transportation system, and particularly relates to a fluid transportation system that transports a tiny amount of fluid, using a micropump. BACKGROUND OF THE INVENTION [0003] In recent years, there have been developed and offered various micropumps that are incorporated in a fluid transportation system for biological tests, chemical analysis, drug discovery, etc. and transport a tiny amount of liquid in high accuracy. Such a micropump is structured such that a flow path and fluid reservoir that communicate with a respective one of the both ends of a chamber provided with a diaphragm driven by a piezoelectric element, through a narrow flow path portion or open-and-close valve. [0004] ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F04B17/00
CPCF04B53/1077F04B43/043
Inventor HIGASHINO, KUSUNOKISANDO, YASUHIRO
Owner KONICA MINOLTA INC
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