Sprayer control system and method for using same

• US 5,310,113 A
• Filed: 12/01/1992
• Issued: 05/10/1994
• Est. Priority Date: 12/01/1992
• Status: Expired due to Term

• Current Assignee: Midwest Air Technologies, Inc.
• Original Assignee: Bruce E. Cowgur
• Inventors: Cowgur, Bruce E.
• Primary Examiner(s): Kashnikow, Andres
• Assistant Examiner(s): GRANT, WILLIAM ALEXANDER
• Application Number:
  US07/983,816
• Time in Patent Office: 525 Days
• Field of Search: 239/10, 239/71, 239/124, 239/127, 239/155, 239/170, 239/172, 239/307, 239/308, 239/310, 239/446, 239/447, 239/68, 239/69
• US Class Current: 239/10
• CPC Class Codes: A01M 7/0092 Adding active material used as well for the introduction of fertilisers in water A01C23/042
• CPC Class Codes: B05B 12/1418 for supplying several liquids or other fluent materials in selected proportions to a single spray outlet controlling ratio of two or more flows of fluid G05D11/02
• CPC Class Codes: B05B 15/58 preventing deposits, drying-out or blockage by recirculating the fluid to be sprayed from upstream of the discharge opening back to the supplying means B05B1/3093 takes precedence
• CPC Class Codes: B05B 7/32 the fed liquid or other fluent material being under pressure

Abstract

A sprayer control system and method for using same includes a pump for directing a mixture of chemical and fluid carrier to a flow control valve. The flow control valve includes an intake port, a bypass port, and a regulated outlet port. A valve member is rotatable to direct fluid from the intake port either to the bypass port or the regulated output port. Fluid from the bypass port is sent through a bypass line back to the intake opening of the fluid pump. Various chemical tanks are connected to the bypass line for injecting metered amounts of chemical into the bypass line.

Claims

1. A chemical mixing and delivery system for delivering a mixture of carrier fluid and fluid chemical additive to at least one sprayer head, said system comprising:

a regulated flow conduit connected to said sprayer head;

a fluid pump having a fluid intake opening and a discharge opening and being adapted to pump fluid from said intake opening outwardly through said discharge opening;

a flow control valve having an intake port, a bypass port, and a regulated port;

first conduit means connecting said intake opening of said pump to said source of said carrier fluid;

second conduit means connecting said discharge port of said pump to said intake port of said flow control valve;

said regulated port of said flow control valve being adapted for connection to said regulated flow conduit;

a bypass conduit having a first end connected to said bypass port of said flow control valve and a second end connected to said first conduit means;

chemical additive means for adding a predetermined quantity of said chemical additive to said bypass conduit whereby a mixture of said chemical additive and said carrier fluid will be introduced to said fluid intake opening of said pump;

said flow control valve having a valve member movable between a bypass position connecting said bypass port to said intake port and a regulated position connecting said intake port to said regulated port, said valve member connecting said intake port to both of said bypass port and said regulated port while moving between said bypass position and said regulated position;

a flow sensor connected to said regulated flow conduit between said flow control valve and said sprayer head for sensing the rate of flow of said mixture of said chemical additive and said carrier fluid through said regulated flow conduit;

control means connected to said flow sensor and said flow control valve for causing adjustment of the position of said flow control valve in response to the rate of flow sensed by said flow sensor;

said control means comprising a microprocessor programmed to compare said flow rate sensed by said flow sensor to a predetermined programmed flow rate and to cause adjustment of said flow control valve until said flow rate sensed by said flow sensor matches said predetermined programmed flow rate.

2. The system according to claim 1 wherein said valve member completely closes off said intake port from said bypass port when said valve member is in said regulated position, and said valve member completely closes off said intake port from said regulated port when said valve member is in said bypass position.

3. The system according to claim 1 wherein said valve member, when moving from said bypass position to said regulated position, progressively increases the volume of fluid flowing from said intake port to said regulated port and progressively decreases the volume of fluid flowing from said intake port to said bypass port, and said valve member, when moving from said regulated position to said bypass position, progressively increases the volume of fluid flowing from said intake port to said bypass port and progressively decreases the volume of fluid flowing from said intake port to said regulated port.

4. The system according to claim 1 wherein said chemical additive means comprises at least one source of said fluid chemical additive, chemical conduit means connecting said at least one chemical source to said bypass conduit for permitting said fluid chemical additive to pass from said at least one chemical source into said bypass conduit, and chemical valve means for adjusting the amount of said chemical additive which passes into said bypass conduit.

5. The system according to claim 4 wherein said control means connected to said chemical valve means and said flow control valve for controlling movement of said chemical valve means and said flow control valve.

6. The system according to claim 5 wherein said control means further comprises power means for supplying power to said chemical valve means and said flow control valve, said microprocessor being connected to said power means and being programmed to cause said power means to move said chemical valve means and said flow control valve to predetermined respective positions for causing a predetermined amount of said chemical additive for a desired mixture to pass into said bypass conduit and a predetermined volume of said mixture to be pumped by said pump to said regulated conduit.

7. The system according to claim 6 and further comprising data input means connected to said microprocessor for providing said microprocessor with input data corresponding to the desired mixture of said fluid chemical additive and said carrier fluid and corresponding to said programmed flow rate of said mixture desired to be delivered to said regulated conduit.

8. The system according to claim 7 wherein said data input means further comprises at least one manually operable data switch for manually entering selected data into said microprocessor.

9. The system according to claim 8 wherein one of said at least one switch is a rate switch for entering rate data into said microprocessor corresponding to and programmed flow rate of said mixture to said regulated flow conduit.

10. The system according to claim 9 wherein said data input means further comprises a ground speed sensor adapted to be connected to a vehicle for sensing the ground speed of said vehicle;

said ground speed sensor being connected to said microprocessor, said microprocessor being programmed to cause adjustment of said flow control valve in response to changes in ground speed sensed by said ground speed sensor.

11. A method for mixing and delivering a carrier fluid and a chemical additive fluid to a regulated flow conduit comprising:

introducing a first predetermined quantity of said chemical additive fluid to a second predetermined quantity of said carrier fluid to create a mixture;

using a pump to pump said mixture to an intake port of a flow control valve, said flow control valve having a regulated outlet port, a bypass port, and a valve member movable between a regulated position wherein said mixture will flow from said intake port to said regulated outlet port and a bypass position wherein said mixture will flow from said intake port to said bypass port, said valve member when moving from said regulated position to said bypass position causing a progressively increasing volume of said mixture to be delivered to said bypass port and a progressively decreasing volume of said mixture to be delivered to said regulated outlet port;

taking the bypass portion of said mixture flowing from said bypass port and reintroducing said bypass portion to said pump for being pumped again to said intake port of said flow control valve;

sensing the flow rate of said mixture flowing from said regulated outlet port with a flow sensor;

connecting a microprocessor to both of said flow sensor and said valve member;

using said microprocessor to compare the flow rate sensed by said flow sensor to a predetermined regulate flow rate and to cause movement of said valve member to a position wherein said flow rate sensed by said flow sensor matches said predetermined flow rate.