Automatic filler

Abstract

A chemical proportioner comprises an eductor wherein a venturi generates a vacuum to suck chemical into a diluent and also to maintain open a diluent valve until the vacuum is automatically vented by depletion of a concentrated chemical, discharge of a predetermined diluent and chemical mix or manual venting. An expansible chamber device such as a bellows is operably connected to a diluent valve to maintain it in open position until a vacuum operating on such bellows is vented by one or more of the foregoing events.

1 . A diluted chemical dispenser having a water inlet and water valve, a venturi for creating a suction to draw a concentrated chemical into a water flow and a discharge passage for discharging diluted chemical, said dispenser including:
 a switch for activating and deactivating a water valve;   a bellows for holding said switch in a position to hold open said water valve;   said venturi operably connected through a passage to apply a bellows operating suction to said bellows to hold said switch in said position; and   a vent line operably communicating with to said bellows for venting said bellows to selectively close said switch and said water valve.   
   
   
       2 . A dispenser as in  claim 1  including a manually operable valve for venting said vent line. 
   
   
       3 . A dispenser as in  claim 1  including a float valve for venting said vent line upon opening of said float valve. 
   
   
       4 . A dispenser as in  claim 1  including a chemical pick-up for venting said vent line when concentrated chemical is depleted. 
   
   
       5 . A chemical dispenser for drawing concentrated chemical into a diluent flow and dispensing mixed chemical and diluent, said dispenser including:
 venturi initiated vacuum means for stopping said dispenser in response to depletion of concentrated chemical.   
   
   
       6 . A dispenser as in  claim 5  farther including venturi initiated vacuum means for stopping said dispensing in response to the establishment of a pre-determined level of dispensed chemical and diluent in a receiving container. 
   
   
       7 . A chemical dispenser including a venturi operated proportioner receiving a diluent from a diluent valve and drawing concentrated chemical into said diluent upon opening of said diluent valve through manual operation of a switch, said dispenser further including:
 an expansible chamber member operably connected to said switch for holding said switch open upon application of a suction to said member; and   a vent operably communicating with said expansible chamber member for moving said member and releasing said switch to close said diluent valve.   
   
   
       8 . A dispenser as in  claim 7  wherein said vent comprises a chemical pick-up tube exposed to atmosphere upon depletion of concentrated chemical. 
   
   
       9 . A dispenser as in  claim 7  wherein said vent comprises a float valve opened in response to establishment of a pre-determined level of mixed diluent and chemical. 
   
   
       10 . A dispenser as in  claim 7  wherein said vent comprises a manually operated valve. 
   
   
       11 . An eductor for use in a chemical proportioning dispenser for mixing a chemical with a diluent passing from a diluent valve through a venturi said venturi providing a vacuum upon passage of diluent there through and being operably connected to a chemical source for drawing a chemical into said diluent upon applying a vacuum to said chemical and said venturi operably applying a vacuum for retaining said diluent valve in a position to pass diluent to said venturi while said vacuum is so applied. 
   
   
       12 . A method of controlling a chemical proportioner including the steps of:
 passing a diluent through a valve to a venturi;   passing a diluent through the venturi and creating a vacuum;   applying said vacuum to a chemical source and drawing chemical into said diluent as a function of said vacuum; and   applying said vacuum to and holding said valve in an open position to pass diluent therethrough.   
   
   
       13 . A method as in  claim 12  including the step of interrupting said vacuum applied to hold said valve in said open position and closing said valve. 
   
   
       14 . A method as in  claim 13  including the step of interrupting said vacuum by venting vacuum applied to said chemical source. 
   
   
       15 . A method as in  claim 13  including the step of interrupting said vacuum by venting said vacuum through a valve from a position proximate a container receiving mixed chemical and diluent. 
   
   
       16 . A method as in  claim 13  including the step of interrupting said vacuum by manual operation of a valve venting said vacuum. 
   
   
       17 . A method of automatically controlling a chemical proportioner which includes a venturi for creating a vacuum upon passage of a diluent therethrough, said vacuum drawing a chemical into said diluent, the step of:
 applying said vacuum for holding open a diluent valve and venting said vacuum to close said diluent valve.   
   
   
       18 . A method as in  claim 17  wherein said proportioner includes an expansible chamber member connected to said venturi, said member operably connected to said diluent valve for holding said valve open when vacuum is applied to said member, and including the step of interrupting said vacuum and closing said diluent valve by venting vacuum applied to said member. 
   
   
       19 . A method as in  claim 18  including the step of venting said vacuum upon depletion of said chemical. 
   
   
       20 . A method as in  claim 18  including the step of venting said vacuum through a valve which opens in response to said mixed chemical and diluent reaching a predetermined level in a container receiving said mixed chemical and diluent. 
   
   
       21 . A method as in  claim 18  including the step of venting said vacuum by manually opening a vent valve operably communicating with said member.