Valve, fluid control device, and sphygmomanometer

Patent metadata

Field	Value
Publication number	US-2017215744-A1
Application number	US-201715491405-A
Country	US
Kind code	A1
Filing date	Apr 19, 2017
Priority date	Oct 21, 2014
Publication date	Aug 3, 2017
Grant date	—

Abstract

A sphygmomanometer device includes a piezoelectric pump, a valve, and a cuff. The valve includes a first valve housing, a diaphragm, and a second valve housing. The diaphragm is fixed to the second valve housing and first valve housing such that it is separated from a valve seat and the periphery of an opening portion in the diaphragm is in contact with a valve seat while providing a pressure thereto. Thus, the diaphragm defines a lower valve chamber communicating with a first vent hole, an upper valve chamber communicating with a second vent hole, a lower valve chamber communicating with a first vent hole, and an upper valve chamber communicating with the upper valve chamber, together with the second valve housing and first valve housing.

First claim

1 . A valve comprising:
a valve housing having a first vent hole, a second vent hole, a third vent hole, a first valve seat, and a second valve seat, the second valve seat protruding from a periphery of the third vent hole; and a diaphragm having an opening portion and fixed to the valve housing such that a periphery of the opening portion is in contact with the first valve seat while providing a pressure thereto and the diaphragm is separated from the second valve seat, wherein the diaphragm defines a first valve chamber communicating with the first vent hole and a second valve chamber communicating with the second vent hole and the third vent hole, together with the valve housing, and when a pressure in the first valve chamber is higher than a pressure in the second valve chamber and lower than the provided pressure, the diaphragm is in contact with the second valve seat and closes the third vent hole, and when the pressure in the first valve chamber is equal to or higher than the provided pressure, the diaphragm is separated from the first valve seat.

2 . The valve according to claim 1 , wherein when the pressure in the first valve chamber is equal to or lower than the pressure in the second valve chamber, the diaphragm is separated from the second valve seat, opens the third vent hole, and is in contact with the first valve seat.

3 . The valve according to claim 1 , wherein a relationship y<3/16×((1−v 2 )/(E×t 3 ))×P3×(r 2 −a 2 ) 2 is satisfied,
where E denotes a Young's modulus of the diaphragm, v denotes a Poisson's ratio of the diaphragm, a denotes a radius of a portion receiving the pressure in the first valve chamber in the diaphragm, t denotes a thickness of the diaphragm, r denotes a distance from a central axis of the diaphragm to an outermost peripheral point in a perimeter of the third vent hole, P3 denotes the provided pressure, and y denotes a distance from a location on the peripheral point axis in the diaphragm to the second valve seat.

4 . A fluid control device comprising:
a pump having a discharge hole; the valve according to claim 1 ; and a container configured to store fluid, wherein the first vent hole in the valve is connected to the discharge hole in the pump, and the second vent hole in the valve is connected to the container.

5 . A sphygmomanometer comprising the fluid control device according to claim 4 .

6 . The valve according to claim 2 , wherein a relationship y<3/16×((1−v 2 )/(E×t 3 ))×P3×(r 2 −a 2 ) 2 is satisfied,
where E denotes a Young's modulus of the diaphragm, v denotes a Poisson's ratio of the diaphragm, a denotes a radius of a portion receiving the pressure in the first valve chamber in the diaphragm, t denotes a thickness of the diaphragm, r denotes a distance from a central axis of the diaphragm to an outermost peripheral point in a perimeter of the third vent hole, P3 denotes the provided pressure, and y denotes a distance from a location on the peripheral point axis in the diaphragm to the second valve seat.

7 . A fluid control device comprising:
a pump having a discharge hole; the valve according to claim 2 ; and a container configured to store fluid, wherein the first vent hole in the valve is connected to the discharge hole in the pump, and the second vent hole in the valve is connected to the container.

8 . A fluid control device comprising:
a pump having a discharge hole; the valve according to claim 3 ; and a container configured to store fluid, wherein the first vent hole in the valve is connected to the discharge hole in the pump, and the second vent hole in the valve is connected to the container.

Assignees

• Murata Manufacturing Co

Inventors

• Kawamura Kenichiro

Classifications

• F04B53/1087

  Valve seats · CPC title

• A61M2039/2493

  Check valve with complex design, e.g. several inlets and outlets and several check valves in one body · CPC title

• F04B53/06

  Venting · CPC title

• F04B53/106

  the valve being a membrane · CPC title

• F16K15/144

  the closure elements being fixed along all or a part of their periphery · CPC title