Valve and fluid control device
A fluid control device ( 111 ) includes a valve section ( 12 ) and a blower section ( 13 ). The valve section ( 12 ) allows fluid to flow in one direction. The valve section ( 12 ) has the shape of a cylindrical container with a valve chamber ( 40 ) provided therein. The valve section ( 12 ) includes a top plate ( 21 ), a side-wall plate ( 22 ), a bottom plate ( 23 ), and a film ( 24 ). A plurality of ejection holes ( 41 ) and a plurality of auxiliary holes ( 49 ) arranged in a predetermined pattern are formed in a central region of the top plate ( 21 ). A plurality of communication holes ( 43 ) arranged in a predetermined pattern are formed in a central region of the bottom plate ( 23 ). A plurality of film holes ( 42 ) arranged in a predetermined pattern are formed in a central region of the film ( 24 ).
1. A fluid control device comprising:
a blower including a blower chamber, a vibrating body facing the blower chamber, and a driving body generating bending vibration of the vibrating body; and
a valve comprising:
a first plate having a first vent hole,
a second plate defining a valve chamber connected to the first vent hole between the second plate and the first plate, the second plate having a second vent hole connected to the valve chamber and not opposed to the first vent hole, and
a film disposed between the first plate and the second plate, the film having a third vent hole opposed to the second vent hole and not opposed to the first vent hole,
wherein the second plate has an auxiliary hole overlapped with the first vent hole in a front view of a principal surface of the second plate, the principal surface facing to the valve chamber,
wherein the valve chamber is in fluid communication with the blower chamber via the first vent hole,
wherein the film is freely movable in a vertical direction between the first plate and the second plate,
wherein the blower includes a vibration adjustment plate that influences vibration of the valve, the vibration adjustment plate being an annular plate that defines an opening, and
wherein the first vent hole, second vent hole, and third vent hole overlap with the opening in the front view.
2. The fluid control device according to claim 1 , wherein a central axis of the auxiliary hole coincides with a central axis of the first vent hole.
3. The fluid control device according to claim 1 , wherein the auxiliary hole includes a plurality of auxiliary holes, and
wherein the second plate includes a crosspiece portion disposed between the plurality of auxiliary holes.
4. The fluid control device according to claim 1 , wherein a diameter of the auxiliary hole is greater than a diameter of the first vent hole.
5. The fluid control device according to claim 1 , wherein a diameter of the auxiliary hole is smaller than a diameter of the first vent hole.
6. The fluid control device according to claim 4 , wherein the second vent hole includes a plurality of second vent holes disposed on both sides of the auxiliary hole, and
wherein, when rh is a radius of the first vent hole, Rs is a radius of the auxiliary hole, r1 and r2 are radii of two of the second vent holes disposed on both sides of the auxiliary hole, and a is a distance between center points of the two of the second vent holes disposed on both sides of the auxiliary hole, the following expression is satisfied: {a−(r1+r2)}/2>Rs≥rh.
7. The fluid control device according to claim 1 ,
wherein the vibrating body includes a peripheral region and a central region, the peripheral region extending from an outermost one of nodes of pressure vibration generated in the blower chamber by the bending vibration of the vibrating body to an outer periphery of the blower chamber, the central region being located inside the peripheral region, and
wherein the peripheral region is a region in which the bending vibration of the central region is suppressed.
8. The fluid control device according to claim 2 , wherein the auxiliary hole includes a plurality of auxiliary holes, and
wherein the second plate includes a crosspiece portion disposed between the plurality of auxiliary holes.
9. The fluid control device according to claim 2 , wherein a diameter of the auxiliary hole is greater than a diameter of the first vent hole.
10. The fluid control device according to claim 3 , wherein a diameter of the auxiliary hole is greater than a diameter of the first vent hole.
11. The fluid control device according to claim 2 , wherein a diameter of the auxiliary hole is smaller than a diameter of the first vent hole.
12. The fluid control device according to claim 3 , wherein a diameter of the auxiliary hole is smaller than a diameter of the first vent hole.
13. The fluid control device according to claim 1 , wherein the film comprises a disc-shaped body having a diameter that is smaller than a diameter of the valve chamber.
14. The fluid control device according to claim 1 , wherein:
the fluid control device further comprises a side-wall plate between the first plate and second plate, the side-wall plate having a cutout portion along an inner periphery thereof, and
the film comprises a disc-shaped body and a projection that extends from the disc-shaped body and is disposed within the cutout portion of the side-wall plate.
15. The fluid control device according to claim 1 , wherein the vibration adjustment plate is provided on the valve such that the vibration adjustment plate overlaps with the valve in the front view.
16. A fluid control device comprising:
a blower including a blower chamber, a vibrating body facing the blower chamber, and a driving body generating bending vibration of the vibrating body; and
a valve comprising:
a first plate having a first vent hole,
a second plate defining a valve chamber connected to the first vent hole between the second plate and the first plate, the second plate having a second vent hole connected to the valve chamber and not opposed to the first vent hole, and
a film disposed between the first plate and the second plate, the film having a third vent hole opposed to the second vent hole and not opposed to the first vent hole,
wherein the second plate has a plurality of auxiliary holes and a crosspiece portion disposed between the auxiliary holes, the auxiliary holes and crosspiece portion overlapping with the first vent hole in a front view of a principal surface of the second plate, the principal surface facing to the valve chamber.
17. The fluid control device according to claim 16 , wherein the valve chamber is in fluid communication with the blower chamber via the first vent hole.
18. The fluid control device according to claim 17 , wherein the film is freely movable in a vertical direction between the first plate and the second plate.
19. A fluid control device comprising:
a blower including a blower chamber, a vibrating body facing the blower chamber, and a driving body generating bending vibration of the vibrating body; and
a valve comprising:
a first plate having a first vent hole,
a second plate defining a valve chamber connected to the first vent hole between the second plate and the first plate, the second plate having a second vent hole connected to the valve chamber and not opposed to the first vent hole, and
a film disposed between the first plate and the second plate, the film having a third vent hole opposed to the second vent hole and not opposed to the first vent hole,
wherein the second plate has an auxiliary hole overlapped with the first vent hole in a front view of a principal surface of the second plate, the principal surface facing to the valve chamber,
wherein the valve chamber is in fluid communication with the blower chamber via the first vent hole,
wherein the film is freely movable in a vertical direction between the first plate and the second plate, and
wherein the blower includes an annular plate that is provided on the valve such that the annular plate overlaps with the valve in the front view.
20. The fluid control device according to claim 19 , wherein the annular plate of the blower defines an opening and is provided on the first plate of the valve such that a central region of the first plate is exposed to the blower chamber via the opening, and a peripheral region of the first plate overlaps with the annular plate in the front view.