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Valveless micro impedance pumpRelated Patent Categories: Pumps, Motor Driven, Electric Or Magnetic Motor, Collapsible Wall Pump, Diaphragm Type, Piezoelectric DrivenValveless micro impedance pump description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070122299, Valveless micro impedance pump. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] The present invention is related to a valveless micro impedance pump in which the difference between impedances of materials results in difference between the impedances of the walls of the flow way for transmitting a medium. [0002] The conventional micro-fluid elements are mainly developed and applied to control, detection, reaction and analysis of micro-fluid. The key elements include micropumps, microvalves, micro-flow ways, micromixers, etc. These elements can be integrated into intelligent micro-fluid chips with different functions. The intelligent micro-fluid chips are applicable to biotechnology, portable physiologic monitor, environmental analyzer, precision fluid control, fuel battery engineering, high-resolution nozzle, micro-power system, etc. The micropump is one of the most important key elements. [0003] The micropumps can be mainly divided into valve-equipped type and valveless type. With respect to valveless micropumps, they can be powered by piezoelectric measure, pneumatic measure, static measure, profile-memorizing alloy, thermopneumatic measure, ultrasonic measure and bimetal. [0004] FIG. 8 is a sectional view of a typical piezoelectric valveless micropump 6. FIG. 9 is a sectional view taken along line B-B of FIG. 8. The piezoelectric valveless micropump 6 is composed of a bottom layer 61, a top layer 62, a piezoelectric element 63 and two micro-flow ducts 64. The piezoelectric valveless micropump 6 is operated in such a manner that a drive voltage is applied to the piezoelectric element 63. The piezoelectric element 63 works to push a vibration membrane 621. The vibration membrane 621 is deformed to cause change of the capacity of a middle flow way 65. This leads to change of pressure. The water comes in from a water inlet 66 and flows through an expanded flow way 67 and the middle flow way 65. The water then flows through another expanded flow way 68 to a water outlet 69. The change of the capacity of the middle flow way 65 results in a pressure difference between the water inlet 66 and water outlet 69. Therefore, the net flow of the water outlet 69 is larger than the net flow of the water inlet 66. Accordingly, the water will flow from the water inlet 66 to the water outlet 69. [0005] The conventional piezoelectric valveless micropump is designed with a complicated expanded flow way. This increases the cost of the piezoelectric valveless micropump. In addition, the liquid can only one-way flow. This limits the application of the piezoelectric valveless micropump. SUMMARY OF THE INVENTION [0006] It is therefore a primary object of the present invention to provide a valveless micro impedance pump in which the materials are different in structure or hardness to lead to a difference between the impedances of the materials. Accordingly, the walls of the flow way have different impedances. Therefore, the medium within the flow way are waved along with the vibration membranes and thus transmitted to the water inlets/outlets. [0007] According to the above object, the valveless micro impedance pump of the present invention includes: [0008] a bottom layer formed with an opening; [0009] a middle layer overlaid on the bottom layer, the middle layer being formed with an elongated recess in a position corresponding to the position of the opening of the bottom layer, the recess being slightly larger than a width of the opening and serving as a flow way, a bottom area of the middle layer between the flow way and the bottom layer being defined as a lower vibration membrane; [0010] a top layer overlaid on the middle layer, the top layer having a fixing seat, a sink being formed on a nearly central portion of the fixing seat, a boss being disposed in the sink, a first water inlet/outlet being formed between left side of the sink and a left end of the top layer, a second water inlet/outlet being formed between right side of the sink and a right end of the top layer, the water inlets/outlets communicating with the flow way, a bottom area of the sink being defined as an upper vibration membrane; and [0011] a piezoelectric element, a bottom face of the piezoelectric element being lengthwise fixed on top end of the boss and top face of the fixing seat. [0012] The present invention can be best understood through the following description and accompanying drawings wherein: BRIEF DESCRIPTION OF THE DRAWINGS [0013] FIG. 1 is a sectional view of the valveless micro impedance pump of the present invention; [0014] FIG. 2 is a sectional view taken along line 2-2 of FIG. 1; [0015] FIG. 3 is a perspective sectional view of the valveless micro impedance pump of the present invention; [0016] FIG. 4 is a flow chart of the manufacturing of the bottom layer of the valveless micro impedance pump of the present invention; [0017] FIG. 5 is a flow chart of the manufacturing of the middle layer of the valveless micro impedance pump of the present invention; [0018] FIG. 6 is a flow chart of the manufacturing of the top layer of the valveless micro impedance pump of the present invention; [0019] FIG. 7 is a sectional view of a second embodiment of the valveless micro impedance pump of the present invention; [0020] FIG. 8 is a sectional view of a conventional piezoelectric valveless micropump; and [0021] FIG. 9 is a sectional view taken along line 9-9 of FIG. 8. Continue reading about Valveless micro impedance pump... Full patent description for Valveless micro impedance pump Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Valveless micro impedance pump patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Valveless micro impedance pump or other areas of interest. ### Previous Patent Application: Electrically driven pump unit Next Patent Application: Electric fuel pump Industry Class: Pumps ### FreshPatents.com Support Thank you for viewing the Valveless micro impedance pump patent info. 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