Proportional valve controlled with a piezoelectric linear actuator

Abstract

The present invention relates to valves and/or fluid pumps and in particular to such valves and/or fluid pumps controlled with gating and/or control module comprising a piezoelectric linear actuator to provide gating of the valve and/or pump system.

1 ) A piezoelectric valve control module ( 100 ,  210 ) for controlling the flow through a valve body ( 10 , 202 ) about a valve seat ( 14 , 208 ) by controlling the position of a valve stem ( 16   t ,  214 ) relative to said valve seat ( 14 ,  208 ), said control module including:
 a) a housing ( 212 ,  102 ) having at least one member or surface ( 228 ,  230 ,  102   s ) adapted for associating with at least a portion of said valve body ( 10 ,  202 );   b) said housing ( 212 ,  102 ) including at least one piezoelectric linear actuator ( 104 ) that is associated with a valve stem ( 214 ,  16   t ) to control the position of said valve stem relative to said valve seat;   c) said piezoelectric linear actuator ( 104 ) comprising a piezoelectric or electrostrictive substrate ( 104   e ), with an electrode provided on each of both surfaces of the piezoelectric or electrostrictive substrate; an elastic body ( 104   b ), to one surface or each of both surfaces of which the piezoelectric or electrostrictive substrate ( 104   e ) is attached; a shaft ( 104   s ) coupled at an end thereof to the elastic body ( 104   b ) or the piezoelectric or electrostrictive substrate ( 104   e ) attached to the elastic body, the shaft ( 104   s ) being operated in conjunction with displacement of the piezoelectric or electrostrictive substrate ( 104   e ); and a movable body ( 104 L,  114 ,  226 ) to be moved along the shaft; and   d) wherein the movement of-said moveable body ( 104 L,  114 ,  226 ) along said shaft ( 104   s ) is controlled with a control signal ( 108   s ) produced by electronic circuitry ( 108 ) disposed in said housing, for controlling the power profile provided to said piezoelectric linear actuator ( 104 ), therein controlling the position of a valve stem ( 16   t ,  214 ) associated with said moveable body ( 104 L,  114 ,  226 ) and the flow rate through said valve body ( 10 , 202 ), characterized in that the flow rate through said valve body is configurable with said control signal ( 108   s ) such that said flow rate is proportional with said control signal ( 108   s ) and wherein said piezoelectric linear actuator ( 104 ) is devoid of a return spring.   
     
     
         2 ) The device of  claim 1  wherein the flow rate through said valve body is linearly proportional with said control signal ( 108   s ,  112   s ). 
     
     
         3 ) The valve control module of  claim 1  comprising a processor for determining or configuring the correlation between said flow rate and said control signal. 
     
     
         4 ) The valve control module of  claim 1  comprising a plurality of piezoelectric actuators. 
     
     
         5 ) The valve control module of  claim 1  wherein said valve stem ( 16   t ,  214 ) is associated with said piezoelectric linear actuator ( 104 ) utilizing a mediating member. 
     
     
         6 ) The valve control module of  claim 5  wherein said mediating member is a torque lever ( 106 ) comprising a first end ( 106   a ) and a second end ( 106   b ), wherein of said first end ( 106   a ) is coupled to said actuator about moveable shaft ( 104   s ) or load ( 104 L), and wherein said torque lever second end ( 106   b ) is pivoted with said valve stem ( 16   t ). 
     
     
         7 ) The valve control module of  claim 6  wherein said torque lever ( 106 ) is integrated with said moveable body. 
     
     
         8 ) The valve control module of  claim 1  wherein said piezoelectric linear actuator is controlled remotely with an auxiliary valve control module ( 112 ) producing a control signal ( 108   s ,  112   s ). 
     
     
         9 ) The valve control module of  claim 1  wherein said valve body ( 10 ,  202 ) is an Over The Counter (‘OTC’) valve body and wherein said housing ( 212 ,  102 ) is configured to associate with said OTC valve body ( 10 , 202 ) about said at least one member or surface ( 228 ,  230 ,  102   s ). 
     
     
         10 ) The valve control module of  claim 9  configured to be retrofit with an OTC valve body wherein said valve control module ( 210 ,  100 ) replaces the control module of an OTC valve. 
     
     
         11 ) The valve control module of  claim 10  wherein said OTC valve is selected from the group consisting of solenoid controlled valves, on-off valves, non-discrete valves. 
     
     
         12 ) The valve control module of  claim 9  wherein said at least one member or surface ( 228 ,  230 ,  102   s ) is provided to access the OTC valve body about at least one member selected from the group consisting of OTC valve seat ( 14 ), OTC valve stem ( 16   t ), OTC gating module ( 16 ), any combination thereof. 
     
     
         13 ) The valve control module of  claim 1  wherein the valve holding force about said valve stem may be configured to be selected from:
 a) from about 100 grams force (gf) to about 2000 grams force (gf); 
 b) up to about 2000 grams force (gf); or 
 c) up to about 1000 grams force (gf). 
 
     
     
         14 ) The valve control module of  claim 4  wherein said moveable body ( 104 L,  114 ,  226 ) is configured to couple a group of said plurality of piezoelectric actuators ( 104 ) about their actuator shaft ( 104   s ). 
     
     
         15 ) The valve control module of  claim 4  wherein said moveable body ( 104 L,  114 ,  226 ) is configured to couple all piezoelectric actuators ( 104 ) about their actuator shaft ( 104   s ). 
     
     
         16 ) The valve control module of  claim 1  wherein said moveable body ( 104 L,  114 ,  226 ) comprises a shaft receiving portion ( 114   t ) wherein the shape of said shaft receiving portion ( 114   t ) is configured to be triangular therein defining at least two actuator shaft contact points. 
     
     
         17 ) The valve control module of  claim 16  wherein the shape of said shaft receiving portion ( 114   t ) is configured to be polygonal having n sides, wherein n is at least 3, therein defining at least n−1 actuator shaft contact points, about said second luminal surface ( 114   h ). 
     
     
         18 ) The valve control module of  claim 17  wherein said moveable body shat receiving portion ( 114   t ) is configurable along at least two surfaces according to the shape and/or configuration of said actuator shaft ( 104   s ) so as to optimize the contact surface there-between, according to at least one or more valve requirements selected from the group consisting of actuator thrust and valve holding force. 
     
     
         19 ) The valve control module of  claim 1  wherein said valve body is selected from the group consisting of leaf valve, T-valve, 4 way valve, 3 way valve, multi-way valve, or any valve body provided for gating fluid control therethrough. 
     
     
         20 ) The valve control module of  claim 1  wherein gating of said valve body is governed by rotational motion, said housing further comprises a linear motion to rotational motion converter wherein the linear motion of said actuator ( 104 ) is converted to rotational motion of a valve stem relative to a valve seat. 
     
     
         21 ) The valve control module of  claim 20  wherein said valve body is selected from the group consisting of a ball type valve, torque valve, or a turn valve. 
     
     
         22 ) The valve control module of  claim 20  wherein said converter comprises at least one or more selected from the group consisting of gear, gear works, cam, linear to rotational transformer, piston, or any combination thereof. 
     
     
         23 ) The valve control module of  claim 8  wherein said auxiliary control module ( 112 ) communicates a control signal ( 112   s ) using at least one or more communication protocols and/or technology selected from the group consisting of wireless, radio frequency (RF), infrared (IR), optical, wired, near field communication (NFC), far field communication (FFC), RFID technology, acoustic, or any combination thereof. 
     
     
         24 ) The valve control module of  claim 1  further comprising an integrated valve stem coupled with said moveable body ( 104 L,  114 ,  226 ) that is associated with said actuator ( 104 ) along said shaft ( 104   s ). 
     
     
         25 ) The valve control module of  claim 9  wherein said control module further comprising an integrated valve stem that is coupled with a valve stem seal ( 214   s ) configured according to an OTC valve seat. 
     
     
         26 ) The valve control module of  claim 17  configured to control a valve body having a plurality of direction of flow. 
     
     
         27 ) The valve control module of  claim 26  wherein each group of piezoelectric actuators controls a single direction of flow. 
     
     
         28 ) A linearly proportional valve comprising the valve control module of  claim 1  integrated with a valve body ( 202 ) such that said control module ( 210 ) controls a valve stem ( 214 ) and valve stem plunger ( 214   s ) about a valve seat ( 208 ).