Two port mems silicon flow control valve
A microvalve includes a first plate having a surface defining an actuator cavity. A second plate has a surface that abuts the surface of the first plate and includes a displaceable member that is disposed within the actuator cavity for movement between a closed position, wherein the displaceable member prevents fluid communication through the microvalve, and an opened position, wherein the displaceable member does not prevent fluid communication through the microvalve. An actuator is connected to the displaceable member. The displaceable member includes a sealing portion having a plurality of elongated control arms extending inwardly from one end thereof, wherein the control arms are configured as a valve closing members for each of a plurality of fluid flow openings in the first plate.
1. A microvalve comprising:
a first plate including a surface having an actuator cavity provided therein;
a second plate having a surface that abuts the surface of the first plate and includes a displaceable member that is disposed within the actuator cavity for movement between a closed position, wherein the displaceable member prevents fluid communication through the microvalve, and an opened position, wherein the displaceable member does not prevent fluid communication through the microvalve; and
an actuator connected to the displaceable member;
wherein the displaceable member includes a sealing portion having a plurality of elongated control arms extending into an opening in the second plate, the control arms configured as a valve closing members for each of a plurality of fluid flow openings in the first plate;
wherein each of the control arms has an opening formed therethrough;
wherein an outboard one of the control arms includes a balance notch formed in the opening formed therethrough;
wherein an elongated balance arm adjacent an outboard one of the control arms opposite the control arm having the balance notch formed therein;
wherein the opening in the second plate has a plurality of elongated balance diverters extending inwardly from a first end of the opening into a space between adjacent ones of the control arms; and
wherein the balance arm and the balance notch are configured to fine tune the balance of the flow forces across the range of movement of the control arms from the closed position to the opened position, and across a range of pressure differential across the microvalve.
2. The microvalve according to claim 1 , wherein three of the control arms are first control arms and one of the control arms is a second control arm.
3. The microvalve according to claim 2 , wherein the first control arms have two openings formed therethrough, and wherein the second control arm has two opening formed therethrough, one of which includes the balance notch.
4. The microvalve according to claim 2 , wherein the first control arms have one opening formed therethrough, and wherein the second control arm has one opening formed therethrough, the one opening in the second control arm including the balance notch.
5. A microvalve comprising:
a first plate including a surface having a first actuator cavity provided therein;
a second plate having a first surface that abuts the surface of the first plate and includes a displaceable member that is disposed within the actuator cavity for movement between a closed position, wherein the displaceable member prevents fluid communication through the microvalve, and an opened position, wherein the displaceable member does not prevent fluid communication through the microvalve;
a third plate including a surface having a second actuator cavity provided therein; wherein the second plate has a second surface that abuts the surface of the third plate; and
an actuator connected to the displaceable member;
wherein the displaceable member includes a sealing portion having a plurality of elongated control arms extending into an opening in the second plate, the control arms configured as a valve closing members for each of a plurality of fluid flow openings in the first plate
wherein each of the control arms has an opening formed therethrough;
wherein an outboard one of the control arms includes a balance notch formed in the opening formed therethrough;
wherein an elongated balance arm adjacent an outboard one of the control arms opposite the control arm having the balance notch formed therein;
wherein the opening in the second plate has a plurality of elongated balance diverters extending inwardly from a first end of the opening into a space between adjacent ones of the control arms; and
wherein the balance arm and the balance notch are configured to fine tune the balance of the flow forces across the range of movement of the control arms from the closed position to the opened position, and across a range of pressure differential across the microvalve.
6. The microvalve according to claim 5 , wherein three of the control arms are first control arms and one of the control arms is a second control arm.
7. The microvalve according to claim 6 , wherein the first control arms have two openings formed therethrough, and wherein the second control arm has two opening formed therethrough, one of which includes the balance notch.
8. The microvalve according to claim 6 , wherein the first control arms have one opening formed therethrough, and wherein the second control arm has one opening formed therethrough, the one opening in the second control arm including the balance notch.