Nova Patents
US2238360A

Nozzle

Abstract

This record has no abstract on file.

US2238360A, drawing sheet 1
Sheet 1 of 4

Term

Term ended

Expired 10 April 1959, 67.5 years ago.

  1. Priority and filed
  2. Granted
  3. Expired
  4. Today

3 claims: 3 independent, 0 dependent

  1. 1
    I claim:1. A burner nozzle adapted to produce a fine pointed flame at widely varying pressures comprising a body member having an orifice tip with a substantially cylindrical inner bore, a cylindrical chamber adjacent said bore, larger than the latter and having a substantially right angular wall adjacent the end of said cylindrical bore, the cylindrical wall of said chamber being imperforate, a grid forming an intermediate wall in said chamber and having a central bore of materially greater diameter than the grid openings which are spaced radially therefrom, and means for conducting a combustible mixture into said chamber in line with said central bore.
  2. 2
    A burner nozzle adapted to produce a fine pointed flame at widely varying pressures comprising a body member having an orifice tip with a substantially cylindrical inner bore and a tapered outer portion, a cylindrical chamber adjacent said bore, larger than the latter and hav 45 ing a substantially right angular front wall adjacent the end of said cylindrical bore and an apertured rear wall, the cylindrical wall of said chamber being imperforate, a grid extending across said chamber between said front and rear 50 walls and having a central bore, and a plurality of bores of smaller diameter spaced radially therefrom, and means for conducting a combustible mixture into said chamber through said apertured rear wall and in line with said central 53 bore.
  3. 3
    A burner nozzle adapted to produce a fine pointed flame at widely varying pressures comprising a body member having an orifice tip with a substantially cylindrical inner bore with its 60 axial length not substantially exceeding its diameter nor substantially less than half of said diameter, a cylindrical chamber adjacent said bore, larger than the latter and having a sub„„„„„ stantially right angular front wall adjacent the However, as 63 end of said cylindrical bore, the cylindrical wall of said chamber being imperforate, a grid extending across said chamber and having a relatively large central bore and a plurality of bores of smaller diameter spaced radially therefrom, 2 2,238,360 from a cylindrical section 22 threaded to fit within the port 4 of the inlet housing I and having an unthreaded portion 24 extending therebeyond of sufficient length to almost engage the grid 9 when the threaded portion 22 has been screwed into the threaded inlet aperture 4 as far as possible, this distance being determined by the engagement of a shoulder 25 with the end face 26 of housing I. Rearwardly from the shoulder 25, a nut portion 27, which may be of hexagonal or other shape, is formed about the cylindrical portion for engagement with a wrench or other tool to secure a tight fit, and the adapter is continued cylindrically beyond the nut portion 21, terminating in a cylindrical portion 28. Cylindrical portion 28 is internally threaded to engage with a gas fitting not shown in the figure, and the chamber portion 29 surrounded by the threaded end is forwardly terminated by a conical surface 30 at the apex of which an orifice 31 is drilled. The diameter of orifice 31 maybe from .004 to .006 inch. A smaller diameter may admit insufficient gas to permit lighting the flame, and a larger diameter will admit so much gas that the mixture is excessively rich. These values are applicable particularly when the range of pressures on the gas supply varies between one and fifty pounds per square inch. The orifice 31 extends forwardly from the conical surface 30 for only a short distance, roughly 30 i of an inch, where it enters the end of center bore 35. A number of symmetrically spaced suction ports 32 are drilled through the element 20. These ports may be slightly larger than A of an inch in diameter, and their common intersec- 35 tion results in an expansion chamber 34, which, in accord with the well-known principles of gaseous flow, acts to reduce the pressure immediately beyond the orifice 31 and to cause an inspiration of air from the surrounding atmosphere through ports 32. This air will join the gaseous fuel and mix therewith as the combination passes down a center bore 35 which extends forwardly throughout the remainder of the cylindrical portions 22 and 24 in alinement with the axis thereof. It will be obvious to those familiar with the art that the construction described produces a simple venturi throat at the orifice 31, the downstream expanded portion 34 being formed by the intersection of bores 32;and in consequence, over a considerable range of gas pressures, sufficient air will be drawn in through the ports 32 to insure proper combustion when the mixture is ignited at the nozzle tip 15. When it is desired to have a larger flame and still retain the advantages of my invention, a tip of the form shown in Fig. 7 may be used. This form differs from that of Fig. 6 by the greater diameter of the nozzle bore 46, which may be as much as inch or more, and by the presence of a second grid 41. The second grid 41 is desirable to keep the flame from blowing away from the nozzle tip. With this construction, I find it is preferable to use a bore 40 about equal in length to the diameter. ?* the sizes increase I find the general proportions set out for the 3¾ of an inch size are satisfactory. The construction described has no moving parta and its effectiveness in operation over the 70 and means for conducting a combustible ^dure mr,™ nf nrpssnres between one and fifty pounds into said chamber in line with said central bore. PERCY M. FORSTER. range of pressures between one and fifty pounds per square inch is apparently dependent in large
Independent claims3