Diaphragm air pump

Title: Diaphragm air pump

Brief Patent Description - Full Patent Description - Patent Claims

The Patent Description & Claims data below is from USPTO Patent Application 20080304983, Diaphragm air pump.

1. A diaphragm air pump comprising: a diaphragm; and upper and lower housings that interpose the diaphragm such that a variable volume chamber is formed over and under the diaphragm, wherein the diaphragm air pump vibrates the diaphragm to obtain a pump operation, a circular concave portion into which the diaphragm that is circular in plan view is fitted is formed in any one of the upper and lower housings, a ring-shaped groove for housing a seal member is formed in the other, the ring-shaped groove having inner and outer diameters which are set across the circular concave portion, and a ring-shaped elastic seal member which is compressively deformed across the periphery of the diaphragm by the upper and lower housings is housed in the ring-shaped groove.

2. The diaphragm air pump according to claim 1, wherein the diaphragm comprises a piezoelectric vibrator.

3. The diaphragm air pump according to claim 2, wherein the piezoelectric vibrator comprises a unimorph-type piezoelectric vibrator in which a piezoelectric body is stacked on a shim formed of a conductive metal thin plate.

4. The diaphragm air pump according to claim 3, wherein the shim of the piezoelectric vibrator has a larger diameter than the piezoelectric body, and the circular concave portion of the lower housing is composed of a large-diameter stepped portion into which the shim is fitted and a small-diameter stepped portion in which the piezoelectric body is housed in a non-contact manner.

5. The diaphragm air pump according to claim 1, wherein the cross-sectional shape of the ring-shaped elastic seal member in a free state is rectangular.

6. The diaphragm air pump according to claim 1, wherein the cross-sectional shape of the ring-shaped elastic seal member in a free state is circular.

7. The diaphragm air pump according to claim 1, wherein the cross-sectional shape of the ring-shaped elastic seal member in a free state is elliptical oval.

8. The diaphragm air pump according to claim 1, wherein the cross-sectional shape of the ring-shaped elastic seal member in a free state is oval.

Brief Patent Description - Full Patent Description - Patent Claims

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Micropump, pump module, and drive module
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Therapeutic device
Industry Class:
Pumps

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