Methods and apparatus for dispersing a fluent material utilizing an electron beam

• US 5,378,957 A
• Filed: 06/11/1992
• Issued: 01/03/1995
• Est. Priority Date: 11/17/1989
• Status: Expired due to Term

• Current Assignee: Charged Injection Technologies, Inc.
• Original Assignee: Charged Injection Corporation
• Inventors: Kelly, Arnold J.
• Primary Examiner(s): Yuska, Donald J.
• Assistant Examiner(s): Zimmerman, Brian
• Application Number:
  US07/856,901
• Time in Patent Office: 936 Days
• Field of Search: 313/231.01, 313/231.31, 313/231.51, 313/420, 361/226, 361/227, 239/463, 239/3, 239/704
• US Class Current: 313/231.01
• CPC Class Codes: B05B 5/025 Discharge apparatus, e.g. electrostatic spray guns

Abstract

Apparatus for dispersing a fluent material such as a liquid includes a device for discharging a stream of the fluent material and a device for providing energetic electrons such that the electrons impinge on the fluent material to provide a net negative charge on the fluent material in the discharged stream. The fluent material discharged is dispersed at least partially under the influence of the net negative charge so imparted. The electron-supply device includes a chamber separated from the fluid passageway by an electron-permeable membrane, and may also include an electron gun for generating a beam of energetic electrons such that the electron beam passes through the window and impinges on the fluent material. The electrons may impinge on the fluent material as the fluent material is discharged from the device so that the fluid flow carries the charged portions of the fluent material away from the device. The apparatus may be used to atomize liquids even where the liquids are electrically conductive.

Claims

1. A method of dispersing a fluent material comprising the steps of:

(a) passing a fluent material to be dispersed past a first side of an electron-permeable membrane and discharging the fluent material;

(b) supplying electrons on a second, opposite side of said membrane so that the electrons pass through the membrane and enter the fluent material so as to provide a net charge on the discharged fluent material, whereby the discharged fluent material is dispersed at least partially under the influence of said net charge, the method further comprising the step of removing positively charged particles from said fluent material in the vicinity of the first side of said membrane prior to dispersion of said fluent material.

2. A method as claimed in claim 1, wherein said step of removing positively charged particles includes the step of maintaining an electrode at a relatively negative electrical potential in the vicinity of said membrane in contact with the fluent material.

3. A method as claimed in claim 2, wherein said fluent material includes a gaseous phase, the method further comprising the step of maintaining the static pressure of said fluent material at a subatmospheric pressure as the fluent material passes said membrane.

4. A method of dispersing a fluent material comprising the steps of:

(a) passing a fluent material to be dispersed past a first side of an electron-permeable membrane and discharging the fluent material;

(b) supplying electrons on a second, opposite side of said membrane so that the electrons pass through the membrane and enter the fluent material so as to provide a net charge on the discharged fluent material, whereby the discharged fluent material is dispersed at least partially under the influence of said net charge, the method further comprising the step of varying the quantity of said electrons at said second side with time.

5. A method as claimed in claim 4, wherein said step of supplying electrons comprises forming an electron beam with an electron gun, and wherein said step of varying the quantity of said electrons comprises varying with time the quantity of electrons emitted by said gun.

6. A method as claimed in claim 4, wherein said step of varying the quantity of said electrons comprises varying said quantity in synchronization to the operating cycle of a device receiving said discharged fluent material.

7. A method as claimed in claim 6, wherein said device is an internal combustion engine.

8. A method of dispersing a fluent material comprising the steps of:

(a) passing a fluent material to be dispersed past a first side of an electron-permeable membrane and discharging the fluent material;

(b) supplying electrons on a second, opposite side of said membrane so that the electrons pass through the membrane and enter the fluent material so as to provide a net charge on the discharged fluent material, whereby the discharged fluent material is dispersed at least partially under the influence of said net charge, wherein said electron-permeable membrane comprises a film formed from boron nitride, and said step of supplying electrons comprises the step of accelerating said electrons with an electron gun through a voltage potential of less than 30 kV.

9. A method of dispersing a fluent material comprising the steps of:

(a) passing a fluent material to be dispersed past a first side of an electron-permeable membrane and discharging the fluent material;

(b) supplying electrons on a second, opposite side of said membrane so that the electrodes pass through the membrane and enter the fluent material so as to provide a net charge on the discharged fluent material, whereby the discharged fluent material is dispersed at least partially under the influence of said net charge, wherein said fluent material is a liquid, and wherein said step of passing comprises imparting a gaseous phase to said liquid before passing said liquid past said electron-permeable membrane.

10. A method as claimed in claim 9, wherein said step of imparting comprises mechanically atomizing said liquid.

11. A method for dispersing a fluent material, comprising:

(a) supplying said material;

(b) injecting electrons into said material so that said material is dispersed at least partially because of the charge of said electrons;

(c) discharging said fluent material into a device having an operating cycle; and

(d) varying the quantity of said electrons injected into said material in synchronization with said operating cycle of said device to thereby vary the extent of said dispersion in synchronization with said operating cycle of said device.

12. A method as claimed in claim 11, wherein said device is an internal combustion engine.

13. A method as claimed in claim 11, wherein said step of injecting electrons comprises applying an electrical potential between a pair of opposed electrodes to cause one of said electrodes to inject electrons into said material under the influence of said potential, said step of supplying said fluent material comprises passing said material between said electrodes concomitantly with the injection of said electrons into said material, and said step of varying the quantity of said electrons comprises varying the electrical potential between said electrodes.

14. A method of dispersing a fluent material comprising the steps of:

(a) passing a fluent material to be dispersed past a first side of an electron-permeable membrane and discharging the fluent material;

(b) supplying electrons on a second, opposite side of said membrane so that the electrons pass through the membrane and enter the fluent material so as to provide a net charge on the discharged fluent material, whereby the discharged fluent material is dispersed at least partially under the influence of said net charge, the method further comprising the step of blocking the transmission of x-ray radiation from the vicinity of said electron-permeable membrane.

15. Apparatus for dispersing a fluent material comprising:

(a) an electron-permeable membrane having a first side and a second side;

(b) fluent material discharge means for passing fluent material to be dispersed past said first side of said electron-permeable membrane and discharging the fluent material; and

(c) electron supply means for providing free electrons at said second side of said membrane so that the electrons pass through said membrane and enter the fluent material to provide a net negative charge on the fluent material discharged by said fluent material discharge means and so that the discharged fluent material is dispersed at least partially under the influence of said net charge, said fluent material discharge means including a body defining a passageway having a narrow section forming a venturi, and means for forcing the fluent material to flow through said passageway so that the pressure of the fluent material is reduced below the pressure of the fluid in other regions of said passageway as the fluent material passes through said section and wherein said electron-permeable membrane is disposed adjacent said section so that electrons provided by said electron supply means enter the fluent material in said section while said fluent material is under reduced pressure.

16. Apparatus as claimed in claim 15, wherein said electron-permeable membrane is disposed generally parallel to the axis of said section.

17. Apparatus as claimed in claim 15, wherein said electron-permeable membrane is disposed generally transverse to the axis of said section.

18. Apparatus as claimed in claim 15, wherein said electron supply means includes an electron gun for directing an electron beam through said membrane into said venturi section.

19. Apparatus for dispersing a fluent material comprising:

(a) an electron-permeable membrane having a first side and a second side;

(b) fluent material discharge means for passing fluent material to be dispersed past said first side of said electron-permeable membrane and discharging the fluent material; and

(c) electron supply means for providing free electrons at said second side of said membrane so that the electrons pass through said membrane and enter the fluent material to provide a net negative charge on the fluent material discharged by said fluent material discharge means and so that the discharged fluent material is dispersed at least partially under the influence of said net charge, the apparatus further comprising shielding means for blocking transmission of radiation from the vicinity of said electron-permeable membrane.

20. Apparatus as claimed in claim 19, wherein said fluent material discharge means includes a body defining a passageway having a downstream end and means for advancing the fluent material within said passageway to said downstream end, said electron-permeable membrane confronting said passageway upstream of said downstream end, said shielding means including at least one baffle disposed in said passageway between said electron-permeable membrane and said downstream end of said passageway.

21. Apparatus as claimed in claim 20, wherein said at least one baffle includes at least one wall section of said body bounding said passageway and defining a tortuous-path section in said passageway between said electron-permeable membrane and said downstream end.

22. Apparatus for dispersing a fluent material comprising:

(a) an electron-permeable membrane having a first side and a second side;

(b) fluent material discharge means for passing fluent material to be dispersed past said first side of said electron-permeable membrane and discharging the fluent material; and

(c) electron supply means for providing free electrons at said second side of said membrane so that the electrons pass through said membrane and enter the fluent material to provide a net negative charge on the fluent material discharged by said fluent material discharge means and so that the discharged fluent material is dispersed at least partially under the influence of said net charge, the apparatus further comprising an electrode disposed adjacent said first side of said electron-permeable membrane so that fluent material passed by said membrane by said discharge means will contact said electrode and means for maintaining said electrode at a relatively negative electrical potential for attracting positively charged particles from the fluent material.

23. Apparatus as claimed in claim 22, wherein said fluent material discharge means includes a body defining a passageway having a section forming a venturi, and wherein said electron-permeable membrane and said electrode is disposed adjacent said section.

24. Apparatus as claimed in claim 22, wherein said fluent material discharge means includes a body defining a passageway having a discharge orifice, and wherein said electron-permeable membrane and said electrode is disposed adjacent said discharge orifice.

25. Apparatus for dispersing a fluent material comprising:

(a) an electron-permeable membrane having a first side and a second side;

(b) fluent material discharge means for passing fluent material to be dispersed past said first side of said electron-permeable membrane and discharging the fluent material; and

(c) electron supply means for providing free electrons at said second side of said membrane so that the electrons pass through said membrane and enter the fluent material to provide a net negative charge on the fluent material discharged by said fluent material discharge means and so that the discharged fluent material is dispersed at least partially under the influence of said net charge, the apparatus further comprising means for varying with time the quantity of said electrons provided at said second side of said electron-permeable membrane.

26. Apparatus as claimed in claim 25, wherein said electron supply means comprise an electron gun and wherein said means for varying the quantity of said electrons comprises means for varying the quantity of electrons emitted by said gun.

27. Apparatus as claimed in claim 26, wherein said electron gun comprises a cathode, a grid and one or more anodes, and wherein said means for varying the quantity of said electrons comprises means for varying the voltage between the grid and cathode.

28. Apparatus as claimed in claim 25, further comprising a device for receiving said discharged fluent material, said device being constructed and arranged to operate cyclically, and wherein said means for varying with time the quantity of said electrons comprises means for varying said quantity in synchronization with said cyclic operation of said device.

29. Apparatus as claimed in claim 28, wherein said device is an internal combustion engine.

30. A method of dispersing a fluent material comprising the steps of:

(a) passing a fluent material to be dispersed past a first side of an electron-permeable membrane and discharging the fluent material;

(b) supplying electrons on a second, opposite side of said membrane so that the electrons pass through the membrane and enter the fluent material so as to provide a net charge on the discharged fluent material, whereby the discharged fluent material is dispersed at least partially under the influence of said net charge, said discharging step including the step of passing said fluent material through a passageway having a narrow section forming a venturi so that pressure of the fluent material is reduced below the pressure of the fluent material in other regions of the passageway as the fluent material passes through said section, said electron-permeable membrane being disposed adjacent said section, and wherein said step of supplying electrons includes the step of directing an electron beam at said electron-permeable membrane so that said beam impinges upon said fluent material in said section while the fluent material is at reduced pressure.

31. Apparatus for dispersing a fluent material comprising:

(a) an electron-permeable membrane having a first side and a second side;

(b) fluent material discharge means for passing fluent material to be dispersed past said first side of said electron-permeable membrane and discharging the fluent material; and

(c) electron supply means for providing free electrons at said second side of said membrane so that the electrons pass through said membrane and enter the fluent material to provide a net negative charge on the fluent material discharged by said fluent material discharge means and so that the discharged fluent material is dispersed at least partially under the influence of said net charge, said electron-permeable membrane comprising a film consisting essentially of boron nitride, the thickness of said film being less than about 3 microns.

32. Apparatus as claimed in claim 31, wherein said electron supply means comprises an electron gun and means for actuating said gun to apply an electron acceleration potential of less than 30 kV.

33. Apparatus for dispersing a fluent material comprising:

(a) an electron-permeable membrane having a first side and a second side;

(b) fluent material discharge means for passing fluent material to be dispersed past said first side of said electron-permeable membrane and discharging the fluent material; and

(c) electron supply means for providing free electrons at said second side of said membrane so that the electrons pass through said membrane and enter the fluent material to provide a net negative charge on the fluent material discharged by said fluent material discharge means and so that the discharged fluent material is dispersed at least partially under the influence of said net charge, wherein said fluent material is a liquid and said fluent material discharge means comprises means for imparting a gaseous phase to said liquid before said liquid passes said electron-permeable membrane.

34. Apparatus as claimed in claim 33, wherein said means for imparting comprises means for initially atomizing said liquid before said liquid passes said electron-permeable so that membrane electrons supplied by said electron supply means enter said initially atomized liquid and said initially atomized liquid is further atomized under the influence of said net charge.

35. Apparatus for dispersing a fluent material, comprising:

(a) means for supplying said material;

(b) means for injecting electrons into said material so that the electrons enter the fluent material to provide a net negative charge on the fluent material and so that the fluent material is dispersed at least partially under the influence of mutual repellence of said net charge;

(c) a device for receiving said dispersed material, said device being constructed and arranged to operate cyclically; and

(d) means for varying the quantity of said electrons injected into said material in synchronization with said cyclic operation to thereby vary the extent of said dispersion in synchronization with said cyclic operation of said receiving device.

36. Apparatus as claimed in claim 35, wherein said means for injecting comprise an electron gun, and wherein said means for varying comprise means for varying the quantity of electrons emitted by said gun.

37. Apparatus as claimed in claim 35, wherein said means for injecting includes a pair of opposed electrodes and means for applying different electrical potentials to said opposed electrodes, said means for supplying said fluent material including means for passing said fluent material between said electrodes so that electrons will be injected into the fluent material under the influence of said potentials, said means for varying including means for varying the potential on at least one of said electrodes.

38. Apparatus as claimed in claim 35, wherein said device for receiving comprises an internal combustion engine.

39. A method of dispersing a fluent material comprising the steps of:

(a) passing a fluent material to be dispersed past a first side of an electron-permeable membrane and discharging the fluent material;

(b) supplying electrons on a second, opposite side of said membrane so that the electrons pass through the membrane and enter the fluent material so as to provide a net charge on the discharged fluent material, whereby the discharged fluent material is dispersed at least partially under the influence of said net charge, said step of discharging said fluent material being conducted so that the static pressure of said fluent material is subatmospheric as said fluent material passes said electron-permeable membrane.

40. A method as claimed in claim 39, wherein said fluent material includes a gaseous phase.

41. A method as claimed in claim 40, wherein said fluent material includes a solid particulate in admixture with said gaseous phase.